System Protection (e.g., Circuit Interrupter, Circuit Limiter, Voltage Suppressor) Patents (Class 700/292)
  • Patent number: 10749377
    Abstract: A microgrid control system including a plurality of distributed generators, loads and/or energy storages. The system includes a microgrid controller arrangement, and a network controller arrangement. The network controller is distributed and configured to perform measurements on the microgrid, send information to at least one other of the plurality of network controllers, and send information to the microgrid controller arrangement based on the performed measurements. The information sent to the microgrid controller arrangement relates to assets which are included in a segment of the microgrid with which the controller is associated. The microgrid controller arrangement is configured to control the plurality of assets by instructing respective converter controller of each of the plurality of assets.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: August 18, 2020
    Assignee: ABB Power Grids Switzerland AG
    Inventor: Ritwik Majumder
  • Patent number: 10666037
    Abstract: The present application relates to a protection and control system for an intelligent substation based on an industrial Internet architecture. The intelligent substation changes a decentralized modeling manner of firstly adding physical apparatuses and then adding functions of the apparatuses in a traditional substation, but adopts a centralized modeling manner of adding all of protection, measurement and control, exchange and telecontrol functions in substation configuration descriptions by taking the whole substation as a modeling object.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: May 26, 2020
    Assignee: KYLAND TECHNOLOGY CO., LTD
    Inventor: Ping Li
  • Patent number: 10651757
    Abstract: An inverter device includes a converter section, an inverter section, and a control device. The converter section full-wave rectifies a three-phase AC voltage and outputs a DC voltage including a ripple component having a frequency six times the frequency of the three-phase AC voltage. The inverter section converts the DC voltage including the ripple component from the converter section into an AC voltage and outputs the AC voltage to a motor. The control device, in a rotating coordinate in which an N-pole direction of a permanent magnet embedded in a rotor of the motor is taken as a d-axis and a direction orthogonal to the d-axis is taken as a q-axis, controls the inverter section so that a phase of a d-axis voltage Vd of the ripple component included in the DC voltage leads a phase of a q-axis voltage Vq.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: May 12, 2020
    Assignee: Daikin Industries, Ltd.
    Inventors: Nobuki Kitano, Tatsuki Inoue
  • Patent number: 10615704
    Abstract: An inverter device includes a converter section, an inverter section, and a control device. The converter section full-wave rectifies a three-phase AC voltage and outputs a DC voltage including a ripple component having a frequency six times the frequency of the three-phase AC voltage. The inverter section converts the DC voltage including the ripple component from the converter section into an AC voltage and outputs the AC voltage to a motor. The control device, in a rotating coordinate in which an N-pole direction of a permanent magnet embedded in a rotor of the motor is taken as a d-axis and a direction orthogonal to the d-axis is taken as a q-axis, controls the inverter section so that a phase of a d-axis voltage Vd of the ripple component included in the DC voltage leads a phase of a q-axis voltage Vq.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: April 7, 2020
    Assignee: Daikin Industries, Ltd.
    Inventors: Nobuki Kitano, Tatsuki Inoue
  • Patent number: 10593497
    Abstract: A system and method for changing protection settings groups for relays in a micro-grid between a grid-connected settings group and an islanded settings group. The method changes a power source relay from the grid-connected settings group to the islanded settings group before the micro-grid is disconnected from the utility grid, disconnects the micro-grid from the utility grid, and then changes a load relay from the grid-connected settings group to the islanded settings group after the micro-grid is disconnected from the utility grid. The method also changes the load relay from the islanded settings group to the grid-connected settings group before the micro-grid is connected to the utility grid, connects the micro-grid to the utility grid, and then changes the power source relay from the islanded settings group to the grid-connected settings group after the micro-grid is connected to the utility grid.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: March 17, 2020
    Assignee: S&C Electric Company
    Inventors: Paul Michael Pabst, Michael James Higginson
  • Patent number: 10594168
    Abstract: An intruding metal detection method for a supplying-end module of an induction type power supply system having a supplying-end coil includes: obtaining a previous peak trigger voltage measured during a previous measurement period and setting a reference voltage to be equal to the previous peak trigger voltage; interrupting at least one driving signal of the induction type power supply system to stop driving the supplying-end coil during a measurement period, to generate a coil signal of the supplying-end coil; measuring a first peak of the coil signal within an oscillation cycle of the coil signal, to obtain a first peak trigger voltage; comparing the first peak trigger voltage with the reference voltage; and determining that there is no intruding metal existing in a power supply range of the induction type power supply system when the first peak trigger voltage is equal to or close to the reference voltage.
    Type: Grant
    Filed: August 22, 2019
    Date of Patent: March 17, 2020
    Assignee: Fu Da Tong Technology Co., Ltd.
    Inventors: Ming-Chiu Tsai, Chi-Che Chan
  • Patent number: 10559953
    Abstract: A power distribution and communication system includes nodes connected by power lines and communication links. The system receives power from one or more power sources. Each node contains at least one power port, data port and load port. Associated with each power port and load port is a port monitor for measuring current flowing into or out of the port and the voltage difference between the port outlet and ground, which measurements are passed to a processing element. The processing element and monitor analyze measured values to detect fault conditions. Upon fault condition detection, the port is disabled by opening a switch, disconnecting the port from the system voltage. The processing element receives power directly from the power line, thus receiving power from a live power line even if the associated power port is disabled allowing the processing element to enable a disabled node following a failure.
    Type: Grant
    Filed: October 3, 2018
    Date of Patent: February 11, 2020
    Assignee: Applied Invention, LLC
    Inventors: W. Daniel Hillis, Anthony N. Gardner, Russel Howe, Randall Adam Yates
  • Patent number: 10436430
    Abstract: A lighting system includes a housing, a lighting element at least partially disposed in the housing, an electrical communication system in communication with the lighting element, and a sensor disposed on a portion of the housing, the sensor being in communication with the lighting element via the electrical communication system, and a first environmental condition sensed by the sensor causes the lighting element to operate when the lighting system is disposed in a first operational orientation and a second environmental condition sensed by the sensor causes the lighting element to operate when the lighting system is disposed in a second operational orientation, the first environmental condition being different from the second environmental condition.
    Type: Grant
    Filed: May 21, 2018
    Date of Patent: October 8, 2019
    Assignee: Good Earth Lighting, Inc.
    Inventor: Brian Coleman
  • Patent number: 10424935
    Abstract: Systems, methods, and devices relating to operating a power generation facility to contribute to the stability of the power transmission system. A controller operates on the power generation facility to modulate real power or reactive power or both in a decoupled manner to contribute to the stability of the power transmission system. Real power produced by the power generation facility can be increased or decreased between zero and the maximum real power available from the PV solar panels, as required by the power system. Reactive power from the power generation facility can be exchanged (injected or absorbed) and both increased or decreased as required by the power transmission system. For solar farms, the solar panels can be connected or disconnected, or operated at non-optimal power production to add or subtract real or reactive power to the power transmission system.
    Type: Grant
    Filed: March 13, 2017
    Date of Patent: September 24, 2019
    Inventor: Rajiv Kumar Varma
  • Patent number: 10411462
    Abstract: A medium voltage power supply is disclosed as including plural medium voltage power lines and plural medium voltage switchboards, connected by respective medium voltage power lines. The medium voltage switchboards are each provided with a respective electrical protection equipment under the IEC 61850 standard and with respective medium voltage signal couplers driven by the electrical protection equipment to transmit and receive Generic Object Oriented Substation Event messages through the medium voltage power lines.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: September 10, 2019
    Assignee: ANSALDO ENERGIA S.P.A.
    Inventor: Gaetano Sanacore
  • Patent number: 10355517
    Abstract: The present invention provides a storage-battery control device 1 capable of enhancing economical efficiency by controlling charge state of a storage battery 12 so that surplus power generated by photovoltaic generation can be entirely charged into the storage battery 12 even in a case where power cannot be sold to a system power supply 50.
    Type: Grant
    Filed: May 25, 2016
    Date of Patent: July 16, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Satoshi Hara, Makiko Kise, Shigeru Aihara, Hiroto Nishiguchi, Takahito Ida, Tomoki Takegami
  • Patent number: 10333301
    Abstract: Protective IEDs in an electrical power system, such as distributed controllers, may periodically or in real-time communicate updated protection settings to a wide-area controller, such as a coordination controller, that defines and/or implements a remedial action scheme to protect the electrical power system. The wide-area controller may utilize real-time protection setting information from a plurality of protective IEDs to perform dynamic transient model simulations based on (1) the current topology of the power system, (2) real-time measurements from the system, and (3) the updated, real-time protection settings of various IEDs within the system. The results of the updated transient model simulations may be used to dynamically adjust the remedial actions scheme of the wide-area controller.
    Type: Grant
    Filed: May 4, 2017
    Date of Patent: June 25, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventor: Krishnanjan Gubba Ravikumar
  • Patent number: 10291025
    Abstract: The embodiments described herein provide for a system including a processor. The processor is configured to select at least one grid system contingency from a plurality of grid system contingencies. The processor is further configured to derive one or more eigen-sensitivity values based on the at least on grid system contingency. The processor is also configured to derive one or more control actions at least partially based on the eigen-sensitivity values. The processor is additionally configured to apply the one or more control actions for generation re-dispatch of a grid system.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: May 14, 2019
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Chaitanya Ashok Baone, Naresh Acharya, Nilanjan Ray Chaudhuri
  • Patent number: 10218196
    Abstract: A system of selecting charging modes for a rechargeable energy storage unit in an autonomous device includes a controller having a processor and tangible, non-transitory memory on which is recorded instructions. The controller is configured to determine availability of at least one charging station and at least one parking lot through a survey of local charging infrastructure and local parking infrastructure, respectively, within a predefined radius of the autonomous device. The controller is configured to determine if it is cost-effective during an excursion to incur a charging fee at the charging station or incur a parking fee at the parking lot. If it is cost-effective to incur the charging fee, then the controller is configured to selectively employ at least one of a plurality of charging modes, including an open-ended charging mode and a defined departure charging mode.
    Type: Grant
    Filed: August 15, 2017
    Date of Patent: February 26, 2019
    Assignee: GM Global Technology Operations LLC
    Inventors: Brandon R. Jones, Ryan Ashby, Tony Wingett, Margaret C. Richards, Matthew S. Stout, Cody D. Berman
  • Patent number: 10116164
    Abstract: A flexible control architecture for an electrical power microgrid provides resiliency when operating under varying threat levels. The architecture includes a microgrid control layer, an intermediate layer and a component control layer. A contingency level is computed based on conditions of the microgrid such as weather and system state. When the contingency level indicates a low degree of threat, the system operates in a centralized, top-down control configuration. When the contingency level indicates a high degree of threat, the system operates in a decentralized control configuration with the microgrid control layer performing only a monitoring function.
    Type: Grant
    Filed: April 21, 2015
    Date of Patent: October 30, 2018
    Assignee: Siemens Aktiengesellschaft
    Inventors: Sanjeev Srivastava, Sindhu Suresh, Paul J. Bruschi, Dong Wei, Parag Patre, Yaosuo Xue
  • Patent number: 10040364
    Abstract: A charging apparatus includes a plurality of charging ports; a charging portion configured to output charge current to the charging ports; an input portion configured to receive selection of a user among a plurality of charge patterns prepared in advance including a charge-history-dependent charge pattern to determine the charge current based on charge history information regarding a charge history of the electrically-powered vehicle; a selection result storing portion configured to store a result of the selection; a history information storing portion configured to store the charge history information of the electrically-powered vehicles connected to any of the charging ports; and a controller configured to refer to the selection result storing portion, control the charging portion in accordance with a selected charge pattern, the controller configured to determine priorities of the electrically-powered vehicles based on the charge history information when the charge-history-dependent charge pattern is selec
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: August 7, 2018
    Assignee: NICHICON CORPORATION
    Inventors: Masaya Nishi, Shigeo Ohkuma
  • Patent number: 10044221
    Abstract: Auxiliary power is required by each generator to orient the rotor blades to face the wind direction and also for other control and safety functions. This auxiliary power is normally extracted from the power generated within each wind turbine generator. During servicing, auxiliary power is supplied from neighbouring generators using dedicated low-voltage cables. In the event of a fault in the high-voltage cable, connecting one of the groups of generators to the sub-station, these low-voltage cables are used to supply the generators within this group with auxiliary power from the output of one or more of the generators, in the other group of generators.
    Type: Grant
    Filed: November 28, 2014
    Date of Patent: August 7, 2018
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Paw Rosenvard, Lars Ulrich Nielsen, Sander J. Larsen
  • Patent number: 10027175
    Abstract: A wireless power transfer system including a plurality of power supply coils, and wirelessly performing power transfer from the power supply coils to a power receiver, includes an entire controller. The entire controller is configured to control the power transfer performed by wirelessly transmitting and receiving powers of the power supply coils and the power receiver, in accordance with confirming power transfer ranges of the plurality of power supply coils.
    Type: Grant
    Filed: September 22, 2015
    Date of Patent: July 17, 2018
    Assignee: FUJITSU LIMITED
    Inventor: Akiyoshi Uchida
  • Patent number: 10018664
    Abstract: A phase control device includes a connection error detection unit. The connection error detection unit includes a phase sequence detection unit that detects a phase sequence of voltage signals, a phase sequence detection unit that detects a phase sequence of current signals, a collation unit that collates the phase sequence of the voltage signals and the phase sequence of the current signals and determines that a connection error is present when the phase sequences are different, phase difference detection units that detect a phase difference between the voltage signal and the current signal, and a phase difference determination unit that determines, when the phase differences output from the phase difference detection units fall without a determination range, that a connection error is present.
    Type: Grant
    Filed: August 6, 2013
    Date of Patent: July 10, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Aya Yamamoto, Tomohito Mori, Daigo Matsumoto
  • Patent number: 10013379
    Abstract: A system for assigning addresses to a plurality of communication nodes coupled via a power line is disclosed. Each of the plurality of communication nodes includes a current sensor. The plurality of communication nodes includes one master communication node and the master communication node is configured to start an auto-addressing process by asking the each of the plurality of communication nodes to sink a preselect amount of current and measure current, through the current sensor, flowing through the powerline under the each of the plurality of communication nodes. A first communication node in the plurality of communication nodes that does not measure any current flowing under the first communication node is assigned a first address.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: July 3, 2018
    Assignee: NXP B.V.
    Inventors: Bernd Uwe Gerhard Elend, Rainer Evers
  • Patent number: 10008053
    Abstract: An on-board maintenance system for an aircraft, said aircraft comprising pieces of equipment connected together through a first on-board data transmission network for exchanging operational data intended for piloting the aircraft, said maintenance system including a processing unit and being characterized in that it comprises a second data transmission network, distinct from the first network, for exchanging data intended for maintenance of the equipment of the aircraft, said second network connecting at least some of said pieces of equipment to the processing unit; said processing unit are being adapted for receiving in real time, a data provided by the pieces of equipment on the second network and processing them with view to determining the cause of equipment malfunctions according to at least said received data.
    Type: Grant
    Filed: June 27, 2012
    Date of Patent: June 26, 2018
    Assignee: DASSAULT AVIATION
    Inventors: Laurent Turban, Magali Thorel
  • Patent number: 9965813
    Abstract: In one example, a computing device is configured to calculate fees and revenues related to a lighting infrastructure application framework. An example computing device comprises a memory and a processor coupled to the memory configured with processor-executable instructions to perform operations comprising receiving, data that includes at least one of sensor data and controller information related to at least one of a sensor and a controller, wherein the sensor and the controller are within a local area network coupled to a computing device having the processor and are associated with at least one lighting node platform device; calculating information describing the fees and the revenues associated with the received data, wherein the revenues are for a lighting infrastructure owner associated with the computing device; and transmitting the calculated information to another device associated with the lighting infrastructure application framework.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: May 8, 2018
    Assignee: Sensity Systems Inc.
    Inventors: Hugh Martin, Rusty Cumpston
  • Patent number: 9882370
    Abstract: A multi-faults service restoration method for a power distribution network overcomes the defect that a traditional service restoration method for the power distribution network cannot solve multi-faults. The method includes the steps of performing multi-faults judgment on multi-faults with processing unfinished, to form many multi-faults and many single-faults; then performing unaided fault recovery area division on the multi-faults, and performing power restoration on unaided fault recovery areas one by one; and after the multi-faults are processed, performing power restoration on each single-fault.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: January 30, 2018
    Assignees: STATE GRID CORPORATION OF CHINA, LIAWU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
    Inventors: Guofang Zhu, Hongmei Li, Jincang Niu, Baoguang Zhao, Shangzhen Li, Xin Shi, Yong Li, Xujie Liu, Guanbin Wu, Naiyuan Xu, Sun Li, Yuanbin Liang
  • Patent number: 9863992
    Abstract: There is provided a fault detecting apparatus for detecting a fault in an electric circuit including connecting circuits and an aggregating circuit. The fault detecting apparatus includes a fault detector that detects a fault when at least one of connecting circuit current detectors detects that a current flows and an aggregating current detector detects that a current does not flow.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: January 9, 2018
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Tatsuaki Ambo, Eiichi Ikawa, Chieko Umeno
  • Patent number: 9769420
    Abstract: A user-programmable portable wireless remote monitoring system includes a base unit, a series of sensor units and a remote control device. The base unit is connected to the internet, and receives wireless alerts from sensor arrays deployed in the sensor units. When the sensor units detect a problem, then they send an alert to the base unit, which then relays the alert to the remote control device that is preferably a smart phone, tablet, or the like, including software for operating the system. The system may also incorporate smart outlets that are remotely operable by the remote control device, various monitors, a touchscreen, and wearable tracking devices to monitor a person within the home. The system is designed to provide security, home system monitoring, personal medical monitoring, and remote control of various electrical appliances. The system may also be controlled by using oral commands.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: September 19, 2017
    Inventor: Thomas Lawrence Moses
  • Patent number: 9707850
    Abstract: A temperature sensor 120 automatically shuts down charging operations in response to a temperature increase in a charging handle 150 of an electric vehicle charging station 100. The temperature sensor is connected between a ground conductor and a high voltage conductor L1 in the charging handle. The charging handle includes a return conductor L2/N. The temperature sensor includes a thermistor R1-NTC that changes its resistance in response to an increase in temperature in the charging handle. A portion of current in the high voltage conductor is diverted to the ground conductor, instead of the return conductor, in response to the thermistor sensing a temperature increase, thereby causing a ground fault detector 160 to trip in the charging station.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: July 18, 2017
    Assignee: SCHNEIDER ELECTRIC USA, INC.
    Inventors: Kevin M. Jefferies, Benjamin W. Edwards, Matthew L. White, Konstantin A. Filippenko, Richard K. Weiler
  • Patent number: 9702959
    Abstract: Described herein are methods and systems for remote sensing to derive a calibrated power measurement for a power distribution point. Magnetic field sensors of a sensor module sense a magnetic field emitted by the power distribution point. A first processor generates an uncalibrated power measurement for each magnetic field sensor, the uncalibrated power measurement derived from the magnetic field sensed by the magnetic field sensor and a voltage carried by the power distribution point. A second processor determines a response of each magnetic field sensor to a known power load being drawn through the power distribution point. The second processor derives a transfer function using the response of each magnetic field sensor to the known power load. The second processor applies the transfer function to the uncalibrated power measurement for each magnetic field sensor to generate the calibrated power measurement for the power distribution point.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: July 11, 2017
    Assignee: Earth Networks, Inc.
    Inventors: Robert S. Marshall, Stan Heckman, Chonglin Liu, Christopher Dale Sloop, Scott Stickels, Donnie Bixler, Emily Stickels
  • Patent number: 9697724
    Abstract: A method for connecting low power radios into a self-assembling and self-healing network with multiple portals to higher speed networks such as, but not limited to, electrical or optical Ethernet is provided for monitoring transmission lines, for example. A clamp or other device is provided that includes an integral or associated current transformer and associated circuitry with design elements to address high temperature operation or other operating parameters. An arrangement of sensors is provided (e.g., sensors can be associated with clamps or positioned along infrastructure being monitored and without dependence on any clamps or other devices) that are designed to communicate and operate in an geographically distributed array to provide increased and autonomous monitoring of large utility, highway, communication and similar networks. A unique collection of sensors (e.g.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: July 4, 2017
    Assignee: Hubbell Incorporated
    Inventors: Gary Miller, Bernard Crutcher, Peter Waltz, Christopher Chadbourne
  • Patent number: 9606554
    Abstract: A voltage adjustment device, a voltage adjusting method and a power control system for a distribution system are provided, in which the voltage adjustment device and a static var compensator are appropriately operated in a coordinated manner and the sustention of voltage and the enhancement of the operation efficiency are attained. A voltage adjustment device for a distribution system is installed in the distribution system including a static var compensator on an end side and controls a secondary voltage to be within a predetermined limit value by adjusting a tap position.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: March 28, 2017
    Assignees: Hitachi, Ltd., Tohoku Electric Power Co., Ltd., Tohoku Electric Manufacturing Co., Ltd.
    Inventors: Masahiro Watanabe, Ryo Egashira, Kenichiro Yamane, Katsuhiro Matsuda, Takafumi Futakami, Toshiyuki Seto, Jun Murakoshi
  • Patent number: 9562925
    Abstract: Techniques comprising obtaining, using a sensor unit coupled to a power line in a power distribution system, at least one measurement of at least one inertial property of the power line; and detecting at least one condition of the power line at least in part by analyzing the at least one measurement. A sensor unit configured to be coupled to a power line in a power distribution system, the sensor unit comprising an inertial sensor configured to collect at least one measurement of at least one inertial property of the power line.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: February 7, 2017
    Inventor: Gregory M. Nulty
  • Patent number: 9553454
    Abstract: For network stabilization of an electric power supply network, the voltage at a first network connection point at a first voltage level to a power generator, and at a second network connection point to a second voltage level, as well as at at least one third network connection point to a load, are each sensed as a voltage measurement, wherein a reactive power draw or a reactive power delivery by the power generator is ascertained using a linkage of the voltage measurements with the geographic location of the relevant network connection point.
    Type: Grant
    Filed: March 1, 2012
    Date of Patent: January 24, 2017
    Assignee: BOB Holding GmbH
    Inventor: Bernhard Beck
  • Patent number: 9502900
    Abstract: A voltage stability monitoring apparatus monitors the voltage stability of a transmission corridor through which power flows between different parts of a power system. The apparatus monitors an equivalent load impedance at an interface between the transmission corridor and a part of the power system designated as generating the power. This equivalent load impedance at the interface comprises a ratio of a voltage phasor at the interface to a current phasor at the interface. The apparatus tracks a Thevenin equivalent voltage and impedance of the designated part by separately updating that voltage and impedance. Notably, the apparatus updates the Thevenin equivalent voltage to reflect the magnitude of any changes in the voltage phasor that are associated with large variations in the magnitude of the equivalent load impedance at the interface. The apparatus computes an index indicating the voltage stability as a function of this tracked Thevenin equivalent voltage and impedance.
    Type: Grant
    Filed: November 4, 2013
    Date of Patent: November 22, 2016
    Assignee: Quanta Tachnology, LLC
    Inventors: Mevludin Glavic, Vahid Madani, Damir Novosel
  • Patent number: 9496715
    Abstract: A method for determining the contribution of a grid subsystem (12) to oscillations in grid frequency experienced by an external electrical grid (14) in an electrical power network (10). A measurement of grid frequency is taken in the grid sub-system (12) and/or the external electrical grid (14). The measurement(s) of grid frequency can be used to extract oscillations in grid frequency in the grid subsystem (12) and/or the external electrical grid (14). A measurement of active power is recorded on a transmission line (16c) between the grid subsystem (12) and the external electrical grid (14). The phase relationship between the oscillations in grid frequency and the oscillations in active power allows the contribution of the grid subsystem (2) to oscillations in grid frequency in the external electrical grid (14) to be determined.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: November 15, 2016
    Assignee: Psymetrix Limited
    Inventor: Douglas Wilson
  • Patent number: 9385638
    Abstract: A system, and associated method, for controlling a motor drive coupled to an AC power source in a condition wherein the motor drive is generating a regenerative current. The system includes a plurality of electronic switching devices structured to be provided in anti-parallel connection with a plurality of rectifier diodes of the motor drive, and a controller structured and configured to receive a number of phase voltages from the AC power source, determine a grid angle for the AC power source using the number of phase voltages, and generate a number of control signals for controlling the electronic switching devices using the grid angle when the motor drive is generating the regenerative current.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: July 5, 2016
    Assignee: EATON CORPORATION
    Inventor: Stan Rex Simms
  • Patent number: 9372477
    Abstract: An environmental monitoring device that includes a switching mechanism is described. During operation of the environmental monitoring device, the switching mechanism (such as a switch) selectively electrically couples a first electrical-connection node and a second electrical-connection node. For example, using the switching mechanism, an electronic device that is electrically coupled to the first electrical-connection node may be selectively electrically coupled to a second electronic device that is electrically coupled to the second electrical-connection node. The selective electrical coupling may be based on one or more measurements of an environmental condition in an external environment that includes the environmental monitoring device. Moreover, a sensor mechanism in the environmental monitoring device may provide sensor data based on the one or more measurements.
    Type: Grant
    Filed: July 17, 2014
    Date of Patent: June 21, 2016
    Assignee: Leeo, Inc.
    Inventors: Adam M. Gettings, Andrew G. Stevens, Bjorn H. Hovland, Yi Zheng, Lucas Ivers, Nina S. Joshi
  • Patent number: 9329956
    Abstract: A method and system for reading exception data by a storage server from a storage controller. An exception event is detected at the storage server. The storage server registers with the controller, such that only one storage server can read the exception data at a time. If the storage server is registered with the controller, the storage server reads the exception data. If the storage server does not successfully register with the controller, the controller keeps track of which storage servers have not read the exception data, to ensure that all storage servers can read the data.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: May 3, 2016
    Assignee: NETAPP, INC.
    Inventors: Doug Coatney, Hung Lu
  • Patent number: 9329651
    Abstract: An electric power management system 1 is comprised of an electric power management device 10, measuring devices 4 and 5, and a database 6. The database 6 has stored system information which specifies, for every electric device, a user entity, a location to supply electric power and an associated measuring device, and has stored a needlessness condition which is configured for every user entity or for every location, and specifies a case where an electric device 2 consumes electric power needlessly.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: May 3, 2016
    Assignee: NEC Solution Innovators, Ltd.
    Inventor: Hisashi Sakamoto
  • Patent number: 9291655
    Abstract: A voltage stability monitoring apparatus monitors the voltage stability of a transmission corridor through which power flows between different parts of a power system. The apparatus monitors an equivalent load impedance at an interface between the transmission corridor and a part of the power system designated as generating the power. This equivalent load impedance at the interface comprises a ratio of a voltage phasor at the interface to a current phasor at the interface. The apparatus tracks a Thevenin equivalent voltage and impedance of the designated part by separately updating that voltage and impedance. Notably, the apparatus updates the imaginary part of the Thevenin equivalent voltage to reflect the magnitude of any changes in the voltage phasor that are associated with large variations in the magnitude of the equivalent load impedance at the interface. The apparatus computes an index indicating the voltage stability as a function of this tracked Thevenin equivalent voltage and impedance.
    Type: Grant
    Filed: May 19, 2014
    Date of Patent: March 22, 2016
    Assignee: Quanta Technology, LLC
    Inventors: Mevludin Glavic, Vahid Madani, Damir Novosel
  • Patent number: 9184795
    Abstract: Data is communicated between a digital power transmitter and one or more digital power receivers over a transmission line comprising positive and negative conductors. If the transmitter is sending data to the receiver, a first transmitter electrical switch is selectively operated to increase electrical charge in the transmission-line capacitance. If the receiver is sending data to the transmitter, a first receiver electrical switch is selectively operated to increase electrical charge in the transmission-line capacitance.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: November 10, 2015
    Assignee: VoltServer, Inc.
    Inventor: Stephen Spencer Eaves
  • Patent number: 9136692
    Abstract: A low fault current isolation arrangement senses a loss of voltage and automatically isolates and de-energizes a down live primary wire if overcurrent protection devices have not cleared the high impedance fault in an electric power distribution network. Incorporating an operator selectable time delay response, the low fault current isolation arrangement permits overcurrent protection devices to attempt to detect and shut down the affected conductor, and then isolates and shuts down the low current fault if the overcurrent devices are not successful. The isolation arrangement continuously monitors AC voltage as remotely provided by smart meters even after a fault location is de-energized, and serves as a back up, and not as a replacement, for existing overcurrent protection schemes. A host computer operates in conjunction with plural smart meters each coupled to an associated customer distribution transformer in conjunction with the fault isolator to detect and shut down high impedance faults.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: September 15, 2015
    Assignee: Electrical Materials Company
    Inventors: Timothy M. O'Regan, Timothy J. O'Regan, Thomas Hayes, Kevin J. Severson
  • Patent number: 9136691
    Abstract: An electrical circuit for protection of a solid-state relay includes a switch element connected between an input signal source and an input terminal of the solid-state relay. The solid-state relay includes an output terminal for connection to a load. A sensing element is associated with the solid-state relay to sense an operating parameter associated with the solid-state relay. A feedback element controls the switch element to switch an operating state in response to the operating parameter exceeding a reference parameter. The solid-state relay changes state in response to the switch element to control an output current of the solid-state relay between an energized or de-energized state.
    Type: Grant
    Filed: August 8, 2013
    Date of Patent: September 15, 2015
    Assignee: TYCO ELECTRONICS CORPORATION
    Inventors: Mohammad S. Ahmed, David Bruce Sarraf
  • Patent number: 9128133
    Abstract: Method and module for measuring the rate of change of frequency of a waveform related to a converter unit of a wind turbine generator, comprising: measuring an instantaneous value of said rate of change of frequency of the waveform, calculating a first filtered value of said rate of change of frequency, said first filtered value having good accuracy but low time response, and calculating a second filtered value of said rate of change of frequency said second filtered value having a good time response but low accuracy, comparing said first and second filtered values and selecting that an output value of said measured rate of change is based on said first or second filtered values depending on said comparison.
    Type: Grant
    Filed: April 30, 2013
    Date of Patent: September 8, 2015
    Assignee: GAMESA INNOVATION & TECHNOLOGY, S. L.
    Inventor: Francisco Jimenez Buendia
  • Patent number: 9128132
    Abstract: Performing power quality and synchrophasor analysis on a resampled signal. A first signal may be initially received which corresponds to a power system. The first signal may have a plurality of cycles and may have a frequency that varies over time. One or more parameters may be determined from the first signal. Based on the one or more parameters, the first signal may be resampled to produce an even angle signal. Various power quality measurements may be performed on the even angle signal. Similarly, further processing may be performed to perform synchrophasor measurements, e.g., to determine phasor, frequency, and/or rate of frequency change for the first signal. In some embodiments, the resampling processing elements (e.g., circuitry, programmable hardware elements, processors and memories, etc.) may be shared between the two analyses.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: September 8, 2015
    Assignee: National Instruments Corporation
    Inventors: Qiao Guo, Chen Zhang, Yijun Shi
  • Patent number: 9098817
    Abstract: A method for controlling an energy storage unit having a model which tracks each charging instances includes, for each charging event, capturing energy charged into the energy storage unit and an unit energy price of the charging source(s) at the time of charging; updating a unit price of total energy stored in the storage unit at each time-step; during a discharging event, updating the unit price of energy in the storage unit on a selected cost model; comparing the unit price of energy in the storage unit with other generation sources in the microgrid and a utility tariff; selecting a lowest cost combination from generation, storage, and grid and using the lowest cost combination to supply a load; and if a controller decides to use stored energy at any time, sending a discharge command to the energy storage unit.
    Type: Grant
    Filed: April 6, 2013
    Date of Patent: August 4, 2015
    Assignee: NEC Laboratories America, Inc.
    Inventors: Babak Asghari, Ratnesh Sharma
  • Patent number: 9065269
    Abstract: A digital thermal model for compensating for error in a current transformer used in a solid-state overload relay. The thermal model implements a difference equation that determines using a low-pass filter two parameters corresponding to calibration points along an overload trip curve. The trip curve is adjusted at an ultimate trip current (one calibration point) independently of a trip time at a locked rotor current (another calibration point) of a motor protected by the overload relay. The ultimate trip current and trip time can be adjusted based on a motor full load current set by a user. Large CT error will cause the thermal model to adjust the trip time at the locked rotor current, increasing the range of acceptable CT error, allowing the overload relay to have a wider adjustment range.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: June 23, 2015
    Assignee: SCHNEIDER ELECTRIC USA, INC.
    Inventor: Kevin Jefferies
  • Patent number: 9048697
    Abstract: This specification discloses an intelligent and digitalized process level interface which is referred to herein as an Intelligent Process Interface (IPI). The input of the IPI includes both analog and digital channels and therefore the IPI can be used for substations in transition or retrofit stages with both conventional and non-conventional primary devices. The IPI acts not only as a digitalized interface, but also as an intelligent supervisory and control unit for switching functions. The architecture of the IPI is flexible and allows for the functionality to be distributed to several devices.
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: June 2, 2015
    Assignee: ABB RESEARCH LTD
    Inventors: Zhao Wang, Bernhard Deck, Jianping Wang
  • Patent number: 9043039
    Abstract: An arc detection and intervention system for a solar energy system. One or more arc detectors are strategically located among strings of solar panels. In conjunction with local management units (LMUs), arcs can be isolated and affected panels disconnected from the solar energy system.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: May 26, 2015
    Assignee: TIGO ENERGY, INC.
    Inventors: Daniel Eizips, Shmuel Arditi
  • Publication number: 20150142196
    Abstract: Embodiments of the invention relate generally to power management and the like, and more particularly, to an apparatus, a system, a method, and a computer-readable medium for providing power controlling functionality to generate configurable power signals and to deliver power during fault conditions. In at least some embodiments, a power control unit can generate power signals having configurable attributes as a function of a mode of operation, a fault type, and the like.
    Type: Application
    Filed: November 18, 2013
    Publication date: May 21, 2015
    Applicant: Global Embedded Technologies, Inc.
    Inventors: Mark Stanley Stanczak, Louis Stephen Smutek, Alan Wayne Brown, David Allen Backus
  • Patent number: 9037305
    Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for detecting a power outage. In one aspect, a status request requesting a status of a portion of a power distribution network is received, where the request includes a reference to a power meter that is located within the portion of the network. In response to the status request, a block of communications channels is selected, where the block includes a target communications channel over which a signal corresponding to the referenced power meter is received. In turn, an amplitude of the signal being received over the target communications channel is obtained. A determination is made whether the amplitude of the signal is less than an outage threshold and a status notification is provided that specifies the status of the portion of the power distribution network for which the status has been requested.
    Type: Grant
    Filed: March 2, 2010
    Date of Patent: May 19, 2015
    Assignee: Landis+Gyr Technologies, LLC
    Inventors: Stanley E. McHann, Jr., Robert Zeppetelle
  • Patent number: 9030043
    Abstract: The present invention addresses the problem of avoiding that wind turbine voltage levels within a wind power plant do not exceed predetermined overvoltage and/or undervoltage protection levels. In particular, the present invention relates to shifting of an output voltage level of a wind power plant in order to protect an internal power plant grid against overvoltages.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: May 12, 2015
    Assignee: Vestas Wind Systems A/S
    Inventor: Jorge Martinez Garcia