Plural Generators Patents (Class 307/57)
  • Patent number: 11462909
    Abstract: A method for identifying report triggering events in a power grid to improve stability in the power grid is provided. Energy flow information in the power grid is measured and report triggering events during a predetermined period of time are identified. The report triggering events include at least a predetermined number of load flow transitions where energy flows back from a load associated with the power grid to the power grid during the predetermined period of time and/or exceeding a threshold of time where an energy flow phase angle between voltage and current remains at or near 90 or 270 degrees indicating pure volt-ampere reactive (VAR) operation during the predetermined period of time. A report associated with each of the identified report triggering events is generated and includes a location indicating where the report triggering event occurred in the power grid. The reports are transmitted.
    Type: Grant
    Filed: June 8, 2021
    Date of Patent: October 4, 2022
    Assignee: Sensus Spectrum, LLC
    Inventor: Andrew Dudding
  • Patent number: 11392099
    Abstract: A control system for controlling a power generator of a power generation system executes a control policy to map an input-and-output sequence to a current value of the excitation voltage, submits the current value of the excitation voltage to the power generator, accepts a current value of the rotor angle caused by actuating the power generator according to the current value of the excitation voltage, and updates the input-and-output sequence with the corresponding current values of the rotor angle and the excitation voltage. The input-and-output sequence of values of the operation of the power generator includes a sequence of multiple values of the rotor angle of the power generator and a corresponding sequence of multiple values of excitation voltage to the power generator causing the values of the rotor angle. The control policy maps the input-and-output sequence to a current control input defining the current value of the excitation voltage.
    Type: Grant
    Filed: March 25, 2019
    Date of Patent: July 19, 2022
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Yebin Wang, Weinan Gao
  • Patent number: 11329551
    Abstract: A power sensing and switching circuit, using voltage and current sensors, integrated circuits and logic gates that detects reverse power flow, from reactive loads, non-linear loads or dispersed electrical generators, and mitigates reverse power flow by functioning as a power factor correction device and by diverting the reverse power flow as recycled power to storage, local usage, or remote usage via a recovery line that mitigates distribution grid instability and speeds up the growth of dispersed electrical generators.
    Type: Grant
    Filed: May 14, 2020
    Date of Patent: May 10, 2022
    Inventor: Dean Hatsuo Motoyama
  • Patent number: 10897137
    Abstract: Embodiments herein describe operating a first wind turbine using an auxiliary control system when a high-voltage link coupling a wind park to a grid is not functioning. When using the auxiliary control system, the first wind turbine provides power to a local AC grid which can be used to power auxiliary system in a second wind turbine while the second wind turbine is shutdown. However, when the high-voltage link is functional, the first and second wind turbines provide power to the high-voltage link using a primary control system.
    Type: Grant
    Filed: October 26, 2017
    Date of Patent: January 19, 2021
    Assignee: MHI VESTAS OFFSHORE WIND A/S
    Inventors: Tusitha Abeyasekera, Salvador Año-Villalba, Soledad Bernal Pérez, Ramon Blasco-Gimenez
  • Patent number: 10686369
    Abstract: A power sensing and switching circuit, using voltage and current sensors, integrated circuits and logic gates that detects reverse power flow, from reactive loads, non-linear loads or dispersed electrical generators, and mitigates reverse power flow by functioning as a power factor correction device and by diverting the reverse power flow as recycled power to storage, local usage, or remote usage via a recovery line that mitigates distribution grid instability and speeds up the growth of dispersed electrical generators.
    Type: Grant
    Filed: July 24, 2019
    Date of Patent: June 16, 2020
    Inventor: Dean Hatsuo Motoyama
  • Patent number: 10543928
    Abstract: An electric power distribution system for an aircraft is provided, which includes an engine gearbox, a power distribution center, two or more three-phase synchronous electric power generators, a neutral current transformer per generator, a single set of power feeder wires, and a single generator control unit (GCU). The generators are connected in parallel with each other, and connected with the power distribution center by the same set of power feeder wires. The GCU is electrically coupled with each generator to feed the generator with an excitation field current, and with each neutral current transformer to sense an instantaneous neutral-current value. The GCU is adapted to perform a generator voltage regulation loop based on a desired voltage value and the at least two sensed instantaneous neutral-current values by individually modifying the excitation field current of each generator.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: January 28, 2020
    Assignee: AIRBUS OPERATIONS, S.L.
    Inventor: Salvatore Demelas
  • Patent number: 10256638
    Abstract: An apparatus and method of operating a set of generators supplying power to a common power bus, includes obtaining a first generator speed signal and a second generator speed signal, determining a common mode torsional oscillation value and a differential mode torsional oscillation value, determining a first generator share command and a second generator share command based on the common mode torsional oscillation value and the differential mode torsional oscillation value, and applying the first and second generator share commands.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: April 9, 2019
    Assignee: GE Aviation Systems LLC
    Inventors: Jinhui Zhang, Paul Robert Gemin, Arthur Vorwerk Radun, David Andrew Woodburn, Matthew Bruce Lemon
  • Patent number: 10027118
    Abstract: The present disclosure is directed to a system and method for balancing reactive power loading between multiple renewable energy power systems coupled to a power grid at a point of regulation (POR). The method includes determining a voltage error based on a voltage reference and a measured voltage at the POR. The method also includes measuring at least one operating condition from each of the power systems. Further, the method includes determining a per unit actual reactive power for each of the power systems based on at least one of the actual operating conditions and determining a per unit average reactive power from the power systems based on at least one of the actual operating conditions. Thus, the method also includes determining a voltage reference command for each of the power systems as a function of the voltage error, the per unit reactive power, and/or the per unit average reactive power.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: July 17, 2018
    Assignee: General Electric Company
    Inventors: Enno Ubben, Alfredo Sebastian Achilles, Mark Edward Cardinal, Rajni Kant Burra, Matthew Paul Richwine, Patrick Djan-Sampson
  • Patent number: 9989034
    Abstract: A wind turbine controller for controlling power production of a wind turbine is provided. The wind turbine is arranged within a wind farm coupled to a public power network via a point of common coupling. The wind turbine controller has a receiving unit for receiving a measured value of a property of the wind farm taken at the point of common coupling and for receiving a reference value for the property, and a control unit for controlling the power production of the wind turbine by regulating a local property of the wind turbine based on the received measured value and the received reference value such that the measured value of the wind farm taken at the point of common coupling corresponds to the reference value. Further, a wind turbine having such a controller, a wind farm and a method for controlling a power production of a wind turbine are provided.
    Type: Grant
    Filed: May 17, 2015
    Date of Patent: June 5, 2018
    Assignee: Siemens Aktiengesellschaft
    Inventors: Bjorn Andresen, Dragan Obradovic, Andrei Szabo
  • Patent number: 9882386
    Abstract: A controller used in microgrid systems that includes a primary control module and a secondary control module. The primary control module may employ a primary consensus control to control at least one of a real power and reactive power sharing in at least one distributed generator system of a microgrid. The secondary control module may employ a secondary consensus control to maintain at least one of voltage and frequency in the microgrid to a nominal value.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: January 30, 2018
    Assignee: NEC Corporation
    Inventors: Dawei He, Ratnesh Sharma, Di Shi
  • Patent number: 9748770
    Abstract: In a direct load control system supporting frequency control of an electrical grid, at each electrical load of an aggregation of loads, a load status report is generated comprising an urgency value and a power level. At an aggregation dispatch controller, a dispatch signal is generated based on the generated load status reports and information indicative of electrical frequency. At each electrical load of the aggregation, the load is operated at the reported power level if the reported urgency value satisfies the dispatch signal and is not operated at the reported power level if the reported urgency value does not satisfy the dispatch signal.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: August 29, 2017
    Assignee: BATTELLE MEMORIAL INSTITUTE
    Inventors: Jason W. Black, Jason J. McCullough, Eric Rehberg, James E. Dvorsky, Seyed A. Mansouri
  • Patent number: 9701417
    Abstract: A power quality control system configured to control and monitor electrical systems is provided. The system includes a first generator control unit configured to control a power of a first generator, a second generator control unit configured to control a power of a second generator, and a first integrated power quality module integrated with the first generator control unit and configured to operate as a power quality check for the second generator control unit.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: July 11, 2017
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Mark J. Seger, Trushal D. Patel
  • Patent number: 9630510
    Abstract: In one embodiment, an engine management system (EMS) can use a human machine interface (HMI) to modify operating parameters of a set of engine generators controlled by an engine control unit (ECU). The HMI can permit authorized users to adjust a plurality of operating parameters of the engine generators in accordance with an authorization level of the authorized users. The ECU can be a standalone system operable independent of the EMS. A communication network (e.g., ARCnet) can link the EMS to the ECU, wherein the changes of the operating parameters input via the HMI are maintained over a power-cycle of the EMS. Further, changes of the operating parameters input via the HMI can be maintained even when communications over the communication network linking the engine.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: April 25, 2017
    Assignee: General Electric Company
    Inventors: Suseel Sukumaran, Anirban Roy
  • Patent number: 9507367
    Abstract: A dynamic stochastic optimal power flow (DSOPF) control system is described for performing multi-objective optimal control capability in complex electrical power systems. The DSOPF system and method replaces the traditional adaptive critic designs (ACDs) and secondary voltage control, and provides a coordinated AC power flow control solution to the smart grid operation in an environment with high short-term uncertainty and variability. The DSOPF system and method is used to provide nonlinear optimal control, where the control objective is explicitly formulated to incorporate power system economy, stability and security considerations. The system and method dynamically drives a power system to its optimal operating point by continuously adjusting the steady-state set points sent by a traditional optimal power flow algorithm.
    Type: Grant
    Filed: April 9, 2013
    Date of Patent: November 29, 2016
    Assignees: Clemson University, Georgia Tech Research Corporation, The Curators of the University of Missouri
    Inventors: Ganesh Kumar Venayagamoorthy, Jiaqi Liang, Ronald Gordon Harley
  • Patent number: 9257838
    Abstract: A circuit and method for allocating power among two or more generators to a single load on a shared bus includes a sharing regulator and a feedback loop for each generator. A digital share command input and current in the feedback loops will cause the sharing regulators to alter the power of the generators at the generator outputs, thereby allocating the load on the shared bus according to the share command, and confirming the allocation of power at the outputs.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: February 9, 2016
    Assignee: GE AVIATION SYSTEMS LLC
    Inventors: Slobodan Gataric, Jinhui Zhang
  • Patent number: 9240682
    Abstract: Arc flash mitigation devices are employed to protect personnel during maintenance of photovoltaic inverters. During normal operation, an alternating current (AC) output of a photovoltaic inverter is coupled to a low voltage winding of a step up transformer through a bus-bar (e.g., an electrically conductive interconnect), which has higher current rating than a fuse. During maintenance, the bus-bar is replaced with the fuse. The fuse may be employed in conjunction with a switch. The switch may be a disconnect switch that places the bus-bar in parallel with the fuse during normal operation, and decouples the bus-bar from the fuse during maintenance. The switch may also be a transfer switch that places either the bus-bar or the fuse in series with the AC output of the photovoltaic inverter and the low voltage winding of the step up transformer.
    Type: Grant
    Filed: September 18, 2012
    Date of Patent: January 19, 2016
    Assignee: SunPower Corporation
    Inventors: Seshadri Sivakumar, Jiyong Lian, Venkat Reddy Konala, David Barr, Priyantha Sirisooriya, Jacqueline Ahmad, Jason Spokes
  • Patent number: 9154067
    Abstract: Torque is balanced among generators in a system of parallel generators. Control of the generators may be performed by one or more individual generator controllers or by a centralized controller. The torque on two or more generators is detected. The controller calculates a torque target based on the torque on the two generators or other operating characteristics of the system. The operation of at least one of the generators is controlled based on the torque target.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: October 6, 2015
    Assignee: Kohler Co.
    Inventors: Isaac S. Frampton, Douglas W. Dorn
  • Patent number: 8963370
    Abstract: Load sharing apparatus for load sharing between a plurality of power supplies (1, 2). The apparatus comprises one or more load sharing modules (Share1, Share2), each for association with a respective power supply. The or each load sharing module comprises load determining means for generating a signal which represents a load value corresponding to the power or current supplied by the respective power supply, and voltage control means for controlling the output voltage of the respective power supply to vary inversely with said load value at a first rate when the load value is below a threshold value, and for controlling the output voltage of the respective power supply to vary inversely with said load value at a second rate when the load value equals or exceeds said (first) threshold value. Said second rate is greater than said first rate.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: February 24, 2015
    Assignee: TDK-Lambda UK Limited
    Inventors: Andrew John Skinner, Martin Coates
  • Patent number: 8853885
    Abstract: An apparatus and method for load sharing among N current supplies, where N>1. N current supply paths are coupled to corresponding N independent power sources, respectively. A system load is coupled to the outputs of the N current supply paths to receive N current supplies. There is a common current share bus configured to connect to the N current supply paths to provide a common current share signal, used to indicate the current contribution needed from each of the N current supply paths. In this configuration, each of the N current supply paths adjusts an adjustable voltage drop between its power source and the current supply it provides to the system load in accordance with the common current share signal so that the current supplied from each current supply path is consistent with the common current share signal.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: October 7, 2014
    Assignee: Linear Technology Corporation
    Inventors: Christopher Bruce Umminger, David Henry Soo, Mitchell Edward Lee, Pinkesh Sachdev, Zhipeng Li
  • Patent number: 8723360
    Abstract: A distributed electrical generation system includes a plurality of turbines, generators, diode bridges, transformers and high voltage diodes. The system further includes a HVDC-cable and a high voltage inverter bridge. Each turbine drives a respective one of a plurality of electrical generators producing an alternating current. Each electrical generator is electrically connected to an associated diode bridge and each diode bridge rectifies the alternating current to a direct current. Each diode bridge is electrically connected to an associated transformer and each transformer steps up the direct current to a high voltage direct current. Each transformer is electrically connected in parallel to a high voltage direct current cable by associated high voltage diodes. The high voltage direct current cable is electrically connected to the high voltage inverter bridge. The high voltage inverter bridge converts the direct current to alternating current.
    Type: Grant
    Filed: August 21, 2009
    Date of Patent: May 13, 2014
    Assignee: Rolls-Royce PLC
    Inventor: Paul D. Hopewell
  • Patent number: 8527106
    Abstract: A control unit of a system stabilization device uses a fluctuation detection block (60) to determine fluctuation components included in the active component and reactive component currents of a system current and fluctuation components included in the frequency signal and the amplitude signal of a system voltage. The high frequency cut-off of the fluctuation detection block (60) is set to be f1; the low frequency cut-off is set to be f2. The fluctuation detection block (60) is composed of a low-pass filter (61) with a time constant of T1, a low-pass filter (62) with a time constant of T2, a subtracter (63) which outputs the difference, between the output signals of the filter (61) and the filter (62), and a feedback circuit (64) which provides feedback on the output of the subtracter (63) to the filters (61, 62). Thus, stability is ensured without using a current detector.
    Type: Grant
    Filed: April 10, 2009
    Date of Patent: September 3, 2013
    Assignee: Meidensha Corporation
    Inventors: Masakazu Muneshima, Kazunobu Oi, Issei Hirayama
  • Patent number: 8427005
    Abstract: A device and method for a generator power module. The power module includes an end generator module and an interior generator module that together form a substantial enclosure. The power module may also include a switchgear module. A base may support the modules and may supply common fuel to each of the generators. The enclosure may include a control system to coordinate the generators as a unit in parallel to a utility grid and to control each generator's power output in response to a power load demand. In other embodiments, the enclosure includes a series of drawer air intake louvers to move air into the enclosure. A method of operating the power module includes activating the generators and controlling the control system to individually operate a generator in the block of generators in response to a power load demand.
    Type: Grant
    Filed: August 13, 2010
    Date of Patent: April 23, 2013
    Assignee: PowerSecure, Inc.
    Inventors: Brian Kisner, Christopher Ellis, John R. Saunders
  • Patent number: 8340758
    Abstract: An apparatus and method for controlling an electrical stimulation system to increase the resolution of the stimulation region with multiple independent power source electrodes is proposed. In the apparatus, the electrode set contains at least three electrodes of which two adjacent electrodes are of the same power polarity to control the location of the composite stimulation signal and the others are of an inverse power polarity to balance the total power polarity and narrow the stimulation region. The method for the apparatus comprises steps of: receiving a target stimulation location and level, generating at least one parameter to adjust power settings of the electrodes, thereby obtaining a composite stimulation signal corresponding to a virtual channel of which a location and level match the target stimulation location and level.
    Type: Grant
    Filed: January 23, 2009
    Date of Patent: December 25, 2012
    Assignee: National Chiao Tung University
    Inventors: Charles Tak Ming Choi, Chien Hua Hsu
  • Patent number: 8338983
    Abstract: A method of operating an alternating current (AC) power distribution assembly (PDA), where the ACPDA includes a plurality of AC power distribution modules, each connected to a respective AC load includes turning a first switch off and turning a second switch on in each of the AC power distribution modules; starting up each of the respective AC loads; monitoring a load current in the ACPDA and obtaining an acceptable load current in the ACPDA; determining if a set of motor sensor parameters for the ACPDA are within predetermined limits, and, in the event the motor sensor parameters are within the predetermined limits, determining if a startup period has elapsed; and in the event the startup period has elapsed, turning the first switch on and turning the second switch off in each of the AC power distribution modules.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: December 25, 2012
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Said M. Waleed
  • Patent number: 8283804
    Abstract: A semiconductor IC device capable of power-sharing includes a first power line configured to be supplied with a first power, a second power line configured to be supplied with a second power, a switching block configured to connect the first power line with the second power line in response to a first control signal, and a power-sharing control block configured to generate the control signal in accordance with a plurality of operation command signals.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: October 9, 2012
    Assignee: SK hynix Inc.
    Inventors: Hyung-Soo Kim, Yong-Ju Kim, Sung-Woo Han, Hee-Woong Song, Ic-Su Oh, Tae-Jin Hwang, Hae-Rang Choi, Ji-Wang Lee, Jae-Min Jang, Chang-Kun Park
  • Patent number: 8159086
    Abstract: A method is provided for using a temporary power source to transfer a power bus from a first power source to a second power source. The first power source operates at a first electrical frequency, and the second power source operates at a second electrical frequency that is different from the first electrical frequency. The method includes adjusting the output frequency of the temporary power source to match the first electrical frequency and supplying power to the power bus from the temporary power source. The method also includes disconnecting the first power source from the power bus. The method further includes adjusting the output frequency of the temporary power source to match the second electrical frequency. The method further includes coupling the second power source to the power bus.
    Type: Grant
    Filed: April 30, 2009
    Date of Patent: April 17, 2012
    Assignee: GE Aviation Systems LLC
    Inventor: David Dimitri Karipides
  • Patent number: 7923862
    Abstract: Systems and methods are provided for reactive power regulation and voltage support for renewable energy plants. In one embodiment, a system and method are provided for coordinating voltage and reactive power output of a plant with one or more requirements associated with a utility. The method can include generating a VAR regulator output signal based at least in part on a reactive power control signal received from a utility, controlling reactive power and voltage output of the one or more power sources based at least in part on the generated VAR regulator output signal, aggregating reactive power output or the one or more power sources, and providing the aggregated reactive power to the utility.
    Type: Grant
    Filed: October 6, 2009
    Date of Patent: April 12, 2011
    Assignee: General Electric Company
    Inventors: Mark Edward Cardinal, Einar V. Larsen
  • Patent number: 7808126
    Abstract: A method for controlling dynamic power factor or the reactive power of a wind farm is provided. The wind farm comprises a number of wind turbines connected to a utility grid driven with a requested power factor or a requested reactive power. The wind turbine output voltage is controlled to a specific voltage set point. In the method, the wind farm power factor is measured and compared with the power factor requested for the utility grid, or the wind farm reactive power is measured and compared with the reactive power requested for the utility grid, respectively; the ratio of the wind farm voltage to the utility grid voltage is adjusted, and the output voltage of the individual wind turbines is regulated to correspond to the specific voltage set point; the steps are repeated until the power factor of the wind farm electricity corresponds to the requested reactive power.
    Type: Grant
    Filed: May 12, 2006
    Date of Patent: October 5, 2010
    Assignee: Siemens Aktiengesellschaft
    Inventor: Henrik Stiesdal
  • Patent number: 7782023
    Abstract: Certain embodiments of the present technology provide voltage regulator-alternator configurations that can distribute loads among a plurality of alternators, and fail-safe mechanisms used in connection with such voltage regulator-alternator configurations. For example, certain embodiments of the present technology provide electrical systems that include voltage regulators with connections over which control signals, which indicate whether a detected voltage is higher or lower than a target voltage, can be transmitted to other voltage regulators and received from other voltage regulators. For example, certain embodiments of the present technology provide voltage regulators that include connections over which control signals can be transmitted to other voltage regulators and received from other voltage regulators.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: August 24, 2010
    Assignee: Prestolite Electric, Inc.
    Inventor: German Holguin
  • Patent number: 7679215
    Abstract: A system and method for controlling power ramp rate of a wind farm is provided. The wind farm includes a plurality of wind turbine generators and a wind farm control system. The wind farm control system is operable to monitor rate of change of collective power output of the wind turbine generators, and to limit the rate of change of collective power output by generating a power output rate limiting signal based on the monitored rate of change of collective power output of the wind turbine generators and a desired collective power ramp of the wind turbine generators and applying the power output rate limiting signal to the plurality of wind turbine generators.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: March 16, 2010
    Assignee: General Electric Company
    Inventors: Robert William Delmerico, Mark Edward Cardinal, Kirk Gee Pierce
  • Patent number: 7573160
    Abstract: A method for controlling power produced by a windfarm includes regulating active power produced by the windfarm in accordance with an apparent power setpoint, and regulating a power factor of the windfarm in accordance with a power factor setpoint. However, during periods in which the apparent power setpoint is approached or exceeded, the method includes reducing a magnitude of an angle of a power factor setpoint towards zero and regulating the power factor of the windfarm in accordance with the reduced power factor setpoint angle magnitude.
    Type: Grant
    Filed: July 20, 2005
    Date of Patent: August 11, 2009
    Assignee: General Electric Company
    Inventors: Mark Edward Cardinal, Jignesh Govindlal Gandhi, Andreas Kirchner, Reinhard Brugger
  • Patent number: 7531915
    Abstract: A system and method for controlling power flow between power sources and a load in a power system are disclosed. Briefly described, one embodiment is a method for transferring power from a plurality of power sources to an AC system through an IPC module. The IPC module receives a first amount of power from a first power source that is external to the IPC module, receives a second amount of power from a second power source that is external to the IPC module, controls at least a first amount of direct current (DC) power through a first primary converter module coupled to a DC bus, receives a second amount of DC power from a second primary converter module coupled to the DC bus, converts the first and the second amounts of DC power into AC power, and transfers the AC power to the AC power system.
    Type: Grant
    Filed: May 23, 2006
    Date of Patent: May 12, 2009
    Assignee: Continental Automotive Systems US, Inc.
    Inventors: Kon-King M. Wang, Kent M. Harmon
  • Patent number: 7183668
    Abstract: A detecting means easily detects the abnormality of a generator having a plurality of power supply units. Each of the power supply units includes one of a plurality of output windings L1 to L4, which are wound independently of each other around single iron core, and one of rectifiers 2 to 5 that are provided in correspondence to the output windings and produces an integrated output. Controllers 33 to 35 control the rectifiers such that the output voltage corresponds with a target. A voltage deviation judgment section 37 outputs the abnormal signal when one of the output voltages of the rectifiers 2 to 5 is different from remains. A current deviation judgment section 39 outputs the abnormal signal when one of the output currents of the rectifiers 2 to 5 is different from remains. When the abnormal signal is detected, the outputs of the rectifiers 2 to 5 are stopped.
    Type: Grant
    Filed: May 24, 2005
    Date of Patent: February 27, 2007
    Assignee: Honda Motor Co., Ltd.
    Inventors: Makoto Ogawa, Junichi Eguchi, Tsutomu Hirano, Toshio Inoue
  • Patent number: 7122916
    Abstract: A multi-unit power generation system comprising a plurality of generators connected in parallel, a switching system for switching between and/or aggregating a generator load produced by the plurality of generators and a utility grid load, and a control system. The control system is in communication with each generator for communicating command signals to each generator. The control system is further in communication with the switching system for commanding the switching system to switch between or aggregate the generator load and the utility grid load. Each generator may comprise, for example, a microturbine generator.
    Type: Grant
    Filed: January 16, 2003
    Date of Patent: October 17, 2006
    Assignee: General Electric Company
    Inventors: Cuong Van Nguyen, Daniel W. Trimble
  • Patent number: 7095213
    Abstract: A multifunctional complex power supply device has an anti-countercurrent and voltage-regulation circuit with a rechargeable battery connected in conjunction with a solar battery, a generator and a microphone. A first switch is mounted between the solar battery and the anti-countercurrent and voltage-regulation circuit, a second switch is between the generator and the anti-countercurrent and voltage-regulation circuit, and a third switch is between the microphone and the anti-countercurrent and voltage-regulation circuit. When using the power supply device, one of the switches is selected and the solar battery, generator or sound sounds input into the microphone can charge the rechargeable battery.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: August 22, 2006
    Inventor: Yuan-Lin Weng
  • Patent number: 6958552
    Abstract: A current sharing circuit provides redundant power supplies with current sharing through the use of multiple feedback loops and existing circuit diodes to generate shared load current within predefined load voltage regulation requirements. A method of sharing current allows adjustment of the feedback loops to accommodate characteristics of the circuit.
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: October 25, 2005
    Assignee: ADC DSL Systems, Inc.
    Inventor: George Bertran Dodson, III
  • Patent number: 6657416
    Abstract: A generator structure is provided for generating an AC power for a load. The generator structure includes a generator connectable to a load and an engine operatively connected to the generator for driving the same. A generator controller is operatively connected to the engine for controlling operation thereof and operatively connected to a generator for controlling the AC power generated thereby. A communications link connects the generator control to a network.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: December 2, 2003
    Assignee: Generac Power Systems, Inc.
    Inventors: Robert D. Kern, Gerald C. Ruehlow, Steven J. Wilcox, Francis X. Wedel, Graham McLean, Phillip Harrison, Hongping Zhou
  • Patent number: 6654264
    Abstract: A voltage regulator system includes a plurality of individual voltage regulators that are compounded to provide both high output current capability and low quiescent current at low load currents.
    Type: Grant
    Filed: December 13, 2000
    Date of Patent: November 25, 2003
    Assignee: Intel Corporation
    Inventor: Bruce W. Rose
  • Patent number: 6653821
    Abstract: In accordance with the present invention, a system controller and method for monitoring and controlling a plurality of generator sets are provided. Each generator set generates electrical power and includes a generator communications link for connecting a generator set to a network. A user interface allows a user to select a generator set and set values for various predetermined operating parameters of the selected generator sets. Thereafter, a communications link connectable to the network transmits the user set values of the predetermined operating parameters to the selected generator set.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: November 25, 2003
    Assignee: Generac Power Systems, Inc.
    Inventors: Robert D Kern, Gerald C. Ruehlow, Steven J. Wilcox, Francis X. Wedel, Graham McLean, Phillip Harrison, Hongping Zhou
  • Patent number: 6605880
    Abstract: The process provides constant electric power from a combination of a wind energy generator and a firm secondary generator. The wind energy generator and the secondary generator supply electricity directly to a utility transmission system. The secondary generator must be able to provide power on demand that will meet a utility's needs. The secondary generator is preferably a natural gas turbine, but may be a hydrogen fuel cell, a diesel internal combustion engine, or any other similar technology.
    Type: Grant
    Filed: August 1, 2000
    Date of Patent: August 12, 2003
    Assignee: Navitas Energy, Inc.
    Inventor: Greg J. Jaunich
  • Patent number: 6522030
    Abstract: A method and system for connecting a plurality of power generators, each having an electrical power converter output and adjustable output voltage magnitude and frequency, with at least one digital communications bus to provide synchronization and load sharing. One of the plurality of power generators is designated a master unit and the remainder are designated as slave units.
    Type: Grant
    Filed: July 24, 2000
    Date of Patent: February 18, 2003
    Assignee: Capstone Turbine Corporation
    Inventors: Simon R. Wall, Mark G. Gilbreth, Joel B. Wacknov
  • Patent number: 5945815
    Abstract: A current sharing apparatus for use in a power device system having a plurality of power devices disposed in parallel relationship. The power devices each include a programmable current source, a capacitive element coupled to the current source to generate a reference voltage, a power device configured to generate an output voltage following that of the reference voltage, and a slew rate controller. The controller has an input disposed in sensed communication with the output voltage to generate an error signal and control current from the current source. The current sharing apparatus includes a system output drawer connected to the respective power supply outputs to collect a total system output and a system output detector coupled to the system output drawer. The detector measures the total output through the drawer and is operative to generate a signal indicative of the total output and feed the signal to the respective slew rate controller inputs to further modify the error signals.
    Type: Grant
    Filed: June 12, 1998
    Date of Patent: August 31, 1999
    Assignee: Trilectron Industries, Inc.
    Inventor: Stephen H. Elliott
  • Patent number: 5793812
    Abstract: In the present invention, a line driver circuit enables multiple timing signal generators to simultaneously deliver a timing signal to a load. The multiple or redundant timing signal generators each having a line driver circuit, provide an uninterrupted timing signal that is independent of failures of individual timing signal generators. The multiple timing signal generators share the task of providing the timing signal, i.e. power, to the load. In the event of a failure of one of the timing signal generators, the task of providing power to the load shifts to other of the multiple signal generators, maintaining an uninterrupted timing signal, undisturbed in amplitude, phase and pulse shape. The line driver of each timing signal generator has a drive capability to exceed that required for the timing signal. A voltage clamp regulates the amplitude of the timing signal when the timing signal generators are simultaneously functioning.
    Type: Grant
    Filed: February 21, 1996
    Date of Patent: August 11, 1998
    Assignee: Hewlett-Packard Company
    Inventor: Jeremy S. Sommer
  • Patent number: 5754033
    Abstract: A system (30) for providing electrical-power to remote communities (34) widely distributed over an extended geographical area (38) includes a generating station (32) located proximate each of the communities, each generating station supplying only that community to which it is proximate. The generating stations are in electronic communication with a central computer (40). Each generating station includes a plurality of generators (54-56). Each of the generators is controlled by a microprocessor based controller (64). Each controller is arranged to operate the generating station cooperatively with the other controllers associated with other generators in the station, and to assume a supervisory role in doing so by a mutual arbitration procedure among the controllers. Each controller is also arranged to monitor important generator operating parameters and to communicate these parameters to the central computer.
    Type: Grant
    Filed: March 13, 1996
    Date of Patent: May 19, 1998
    Assignee: Alaska Power Systems Inc.
    Inventor: William R. Thomson
  • Patent number: 5563451
    Abstract: A power supply apparatus comprises a generator (5) that can generate electric power used for welding, lighting, and electric tools and is installed under a load carrying platform (2) of a vehicle (1), a speed-increasing gear (3) that is installed at one side of the generator (5), a power switchboard (4) that is installed at the other side of the generator (5) as integral with the generator (5), and a propeller shaft (14) connecting a side PTO (12) installed on a transmission case (13) to the speed-increasing gear (3).
    Type: Grant
    Filed: April 24, 1995
    Date of Patent: October 8, 1996
    Assignee: Aichi Sangyo Co. Ltd.
    Inventor: Kazutoshi Furukawa
  • Patent number: 5550455
    Abstract: A back-up electric power generating system comprises a first variable speed synchronous generator drivably coupled to a first prime mover, a second variable speed synchronous generator drivably coupled to a second prime mover, a converter having a first and a second input coupled to the first and second generators respectively, and an output, and a logic circuit in controlling communication with the converter for designating one of the first or second generators as a primary power source and one as a standby power source, exclusively. The system further comprises a primary voltage regulator selectably coupled to the primary power source generating a controlled current signal to maintain its output voltage at a given level, and a pulse exciter selectably coupled to the standby power source for verifying the operational readiness of the standby power source. This pulse exciter generates a current pulse signal to the exciter field of said standby power source and monitors the output voltage generated thereby.
    Type: Grant
    Filed: October 26, 1994
    Date of Patent: August 27, 1996
    Assignee: Sundstrand Corporation
    Inventor: Roy S. Baker
  • Patent number: 5517422
    Abstract: A method and apparatus for directly controlling the net power flow on tie lines between different areas of a large electric power system, which provides automatic dynamic control to maintain the stability of the system. Utilizing a sensitivity matrix and simple measurements of real power output from each of the generators in a given area, it is possible to dynamically control the entire system in a way which accounts for loading changes in any area. The control can be implemented using a Flexible AC Transmission Systems (FACTS) technology controller which utilizes the measurements and sensitivity matrix from a given area to determine a derived net power flow from the first area to the remainder of the system, and for comparing the derived net power flow to a set point to provide an error signal which approaches zero as the controller adjusts, for example, a phase angle difference across the tie line to adjust the net power flow thereon.
    Type: Grant
    Filed: October 12, 1993
    Date of Patent: May 14, 1996
    Assignee: Massachusetts Institute of Technology
    Inventors: Marija Ilic, Xiaojun Liu
  • Patent number: 5210445
    Abstract: A change-over type of loading device assembly includes a low-voltage small-capacity type of capacity-variable type loading element in which the capacity is incrementally variable by a capacity change-over element, a transformer connected to said capacity-variable type loading element, a connecting terminal mounted on said capacity-variable type loading element or said transformer, and a plurality of fixed loading elements having the respective connecting terminals and connected in parallel with each other together with said capacity-variable type loading element. These fixed loading elements include a circuit formed by connectively combining a plurality of resistors with each other and comprising element bodies, each receiving the output power from a power generator, and change-over devices for changing one of said resistors in said circuit to another depending upon operation so as to allow the withstand voltage of said circuit to correspond to the output power from said power generator.
    Type: Grant
    Filed: August 27, 1992
    Date of Patent: May 11, 1993
    Assignee: Tatsumi Corporation
    Inventor: Toyoshi Kondoh
  • Patent number: 5077485
    Abstract: The problem for distributing load equally between multiple generators (34) in multi-channel generating systems is resolved using a voltage regulator (60) including a reactive load division loop (84) and real load division loop (86). The voltage regulator (60) controls generator excitation responsive to sensed voltage. The reactive load division loop and real load division loop modify the voltage regulator output to divide loading equally between each generator.
    Type: Grant
    Filed: November 6, 1989
    Date of Patent: December 31, 1991
    Assignee: Sundstrand Corporation
    Inventor: Abdul Rashid
  • Patent number: RE44084
    Abstract: A generator structure is provided for generating an AC power for a load. The generator structure includes a generator connectable to a load and an engine operatively connected to the generator for driving the same. A generator controller is operatively connected to the engine for controlling operation thereof and operatively connected to a generator for controlling the AC power generated thereby. A communications link connects the generator control to a network.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: March 19, 2013
    Assignee: Generac Power Systems, Inc.
    Inventors: Robert D. Kern, Steven J. Wilcox, Gerald C Ruehlow, Frank X. Wedel, Graham McLean, Phillip Harrison, Hongping Zhou