Plural Generators Patents (Class 307/84)
  • Patent number: 10411625
    Abstract: A method for determining a speed (nG) of a generator unit which has an electric machine (100) with a rotor winding (110) and a stator winding (120) and a rectifier (130) connected thereto, via which rectifier the electric machine (100) is connected to an electrical system (150) of a motor vehicle, the speed (nG) being determined depending on the plot of an excitation current (IE) flowing through the rotor winding (110) of the electric machine (100). In particular, the speed is determined from a known relationship between the speed, the frequency of the excitation current, the number of pole pairs and optionally the number of phases when there is an error that leads to a constant phase voltage being output.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: September 10, 2019
    Assignee: Robert Bosch GmbH
    Inventors: Fabio Magini, Manuel Mueller, Michael Wohlfarth, Miriam Riederer
  • Patent number: 10389300
    Abstract: The present invention relates to a fault diagnosis for a photovoltaic system. A fault diagnosis apparatus includes a temperature sensor unit measuring both an internal temperature value of the junction box and a surface temperature value of the solar module; a voltage sensor provided in the junction box; and an operation unit determining where a fault occurs among the solar module, an inside of the junction box, and the inverter by comparing measured values of the temperature sensor unit with a measured value of the voltage sensor. According to the present invention, initial investment cost is inexpensive. In addition, it is possible to detect solar module faults that are difficult to be checked by the naked eye.
    Type: Grant
    Filed: October 8, 2015
    Date of Patent: August 20, 2019
    Assignee: Korea Institute of Energy Research
    Inventors: Sukwhan Ko, Youngseok Jung, Gi-Hwan Kang, Youngchul Ju, Hyemi Hwang, Junghun So, Hee-eun Song
  • Patent number: 10305288
    Abstract: A method and associated control device for synchronizing a turbine with an alternating current network having a network frequency, having the following steps: A) accelerating the turbine up to a frequency in the range of the network frequency; B) sensing an angle difference between the turbine and the alternating current network; C) sensing a speed difference between the turbine and the alternating current network; D) accelerating or decelerating the turbine such that the turbine follows a desired trajectory, wherein the desired trajectory is a trajectory calculated in advance that indicates, in dependence on the angle difference, a desired speed difference that should be present such that a target angular position between the turbine and the alternating current network suitable for synchronous feed-in is achieved when the speed of the turbine and the speed of the alternating current network correspond.
    Type: Grant
    Filed: October 5, 2015
    Date of Patent: May 28, 2019
    Assignee: Siemens Aktiengesellschaft
    Inventors: Matthias Heue, Gerta Zimmer
  • Patent number: 10284126
    Abstract: A method of generating electricity by an alternator and a generator is disclosed. The method includes: connecting in series stator coils of two multi-pole permanent-magnet generators that can generate equiamplitude alternating currents of different frequencies to generate equiamplitude alternating currents of different frequencies that are superimposed to generate an amplitude-modulation alternating current with envelope lines having an amplitude that changes with a voltage difference between two equiamplitude alternating currents; rectifying the amplitude-modulation alternating current positively and negatively through a controllable rectifying circuit; and filtering to output an alternating current having frequency of the envelope lines.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: May 7, 2019
    Inventor: Weijia Chen
  • Patent number: 10135253
    Abstract: A method, system and computer program product enhance the commercial value of electrical power produced from a wind turbine production facility. Features include the use of a premier power conversion device that provides an alternative source of power for supplementing an output power of the wind turbine generation facility when lull periods for wind speed appear. The invention includes a communications infrastructure and coordination mechanism for establishing a relationship with another power production facility such that when excess electrical power is produced by the wind turbine facility, the excess may be provided to the power grid while the other energy production facility cuts back on its output production by a corresponding amount. A tracking mechanism keeps track of the amount of potential energy that was not expended at the other facility and places this amount in a virtual energy storage account, for the benefit of the wind turbine facility.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: November 20, 2018
    Assignee: ABB SCHWEIZ AG
    Inventors: Per-Anders Kristian Lof, Lars Gustaf Ingolf Gertmar, Lars Anders Tommy Andren
  • Patent number: 10027128
    Abstract: A lip shroud for a dragline lip configured to prevent wear on the dragline lip and to prevent decoupling therefrom during operations. The lip shroud comprises of a first sidewall having a first abutment surface provided with an opening; a second sidewall having a second abutment surface wherein the second sidewall has a securing portion configured for coupling to a lock device on the dragline lip; and a center- wall having a third abutment surface, the center wall connecting the first sidewall and the second sidewall wherein the first, second and third abutment surfaces define a channel to receive an edge portion of the dragline lip.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: July 17, 2018
    Assignee: Caterpillar Motoren GmbH & Co. KG
    Inventor: Bernd Müller
  • Patent number: 10008905
    Abstract: A hollow motor module as a combination of a motor and a speed reducer is disclosed. The motor includes an outer stator, a first rotor and a plurality of second rotors. The first rotor is peripherally provided with a first coil and is installed in the outer stator. Each of the plural second rotors is peripherally provided with a second coil and is installed in the first rotor. The second rotor has a coupling portion extending out of the first rotor. The outer stator has first magnets that work with the first coil to magnetically excite the first rotor to rotate. The first rotor has second magnets for the second rotors. The second magnets work with the corresponding second coils to magnetically excite the second rotors to rotate synchronously. The speed reducer is connected to the coupling portions of the second rotors.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: June 26, 2018
    Assignee: Precision Machinery Research & Development Center
    Inventors: Che Chien Chen, Han Pei Wang
  • Patent number: 9960718
    Abstract: The invention relates to a control loop (10) which is installed in a voltage regulator of a motor vehicle alternator and controls an output voltage of the latter by adjusting an excitation current of the alternator. The control loop includes, at the input, means for measuring (31) the output voltage by sampling, generating a measurement signal (Um), error-calculation means (13) generating an error signal (e) equal to a difference between the measurement signal (Um) and a set value (Uo), means for processing the error signal (e) including an amplifier (14) and generating a control signal (Ysat) and, at the output, means (35) for generating a control signal (PWM) controlling excitation control means in accordance with the control signal (Ysat). According to the invention, the processing means also include a phase-advance filter (24).
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: May 1, 2018
    Assignee: Valeo Equipements Electriques Moteur
    Inventors: Pierre Tisserand, Pierre Chassard
  • Patent number: 9912151
    Abstract: A direct current power system includes a common direct current (DC) bus configured to supply power to a plurality of loads. A plurality of alternating current (AC) to DC converter bridges supply DC power to the common CD bus. Each of the AC to DC converter bridges is connected to the common DC bus by at least one split DC link. The at least one split DC link includes a small capacitor connected across output terminals of the respective AC to DC converter bridge and at least one diode coupled between two terminals of the small capacitor and the large capacitor in a way to block an instantaneous current flow from the common DC bus to the respective AC to DC converter bridge in case of a fault of the AC to DC converter bridge.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: March 6, 2018
    Inventors: Pierluigi Tenca, Christof Martin Sihler
  • Patent number: 9871382
    Abstract: A method and a controller for continuously operating a plurality of electric energy generating machines during a high voltage condition at a point of common coupling of the plurality of electric energy generating machines are provided herein. The method includes a) sensing a voltage level at the point of common coupling exceeding a permitted voltage level; b) curtailing an active power output of the plurality of electric energy generating machines such that a reactive capability of the plurality of electric energy generating machines is increased; c) establishing a set point of an electric quantity being present at the point of common coupling such that a reactive electric component providable by the electric energy generating machines is increased; and d) controlling an electric energy generating machine based on the set point of the electric quantity such that the high voltage condition at common coupling is at least partially remedied.
    Type: Grant
    Filed: April 29, 2013
    Date of Patent: January 16, 2018
    Inventors: Robert J. Nelson, Najlae M. Yazghi, William F. Clark
  • Patent number: 9845806
    Abstract: Systems and methods for controlling an auxiliary power unit (APU) are provided. The systems and methods may comprise detecting an operating condition of the APU, determining an optimal APU frequency in response to the operating condition, and setting an angular velocity of the APU to the optimal APU frequency.
    Type: Grant
    Filed: June 4, 2015
    Date of Patent: December 19, 2017
    Assignee: United Technologies Corporation
    Inventors: Victor Pascu, Anthony C. Jones
  • Patent number: 9705334
    Abstract: The present invention concerns a method of feeding electric power into an electric network wherein the feed is effected by means of at least one wind power installation with a first feed-in arrangement at a feed-in point into the electric network, and the feed is effected in dependence on electric parameters in the network and measurement values of the electric parameters or measurement values for determining the electric parameters are detected at measurement times at predetermined time intervals and wherein the measurement times are synchronized to an external time signal available outside the first feed-in arrangement.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: July 11, 2017
    Inventor: Helge Giertz
  • Patent number: 9459674
    Abstract: A power integration module includes a first input connector, a second input connector, an output connector, a switch unit, a determining unit. The first input connector and the second input connector are electrically connected to a first power supply and a second power supply of a power supply module. The output connector is electrically connected to an electrical load. The switch unit is coupled between the first input connector, the second input connector and the output connector. When the switch unit is turned on, the first input power supply and the second input power supply are integrated in parallel and outputted to the output connector to the electrical load. Moreover, an electronic device with a plurality of power integration modules is provided. Thus, the wrong connection is prevented and the condition that the power supplies of different electrical parameters are connected in parallel is avoided.
    Type: Grant
    Filed: November 6, 2013
    Date of Patent: October 4, 2016
    Inventors: Yi-Peng Lin, Kuan-Kun Tang, Pei-Jung Lin
  • Patent number: 9455645
    Abstract: The cascaded multilevel inverter is considered to be a promising topology alternative for low-cost and high-efficiency photovoltaic (PV) systems. However, the leakage current issue, resulting from the stray capacitances between the PV panels and the earth, remains a challenge in the photovoltaic cascaded multilevel inverter application. The present invention presents leakage current suppression solutions for the PV cascaded multilevel inverter by introducing properly arranged and designed passive filters. The embodiments of the invention do not include an active semiconductor device, and as such, the leakage current suppression techniques of the present invention retain the simple structure of the cascaded inverter and do not complicate the associated control system.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: September 27, 2016
    Assignee: The Florida State University Research Foundation, Inc.
    Inventors: Yan Zhou, Hui Li
  • Patent number: 9432034
    Abstract: An integrated oscillator circuit comprises an oscillator configured to be switched between a first frequency and a second frequency. A switching circuit receives an input representing a target frequency and switches the oscillator between the first and second frequencies at intervals determined by the input, so as to cause the average output frequency of the oscillator to approximate the target frequency.
    Type: Grant
    Filed: April 1, 2015
    Date of Patent: August 30, 2016
    Inventors: Ola Bruset, Tor Oyvind Vedal
  • Patent number: 9331486
    Abstract: An exemplary method and apparatus for detecting islanding conditions of a distributed grid are disclosed, wherein transfer of power through a power electrical unit is controlled on the basis of a control reference. The apparatus includes a first stage and a second stage performing a respective portion of the method. The first stage injects a reactive component to the control reference, and, for at least one electrical quantity of the grid, determines a change in the quantity induced by the injected component, and determines, on the basis of the change in the electrical quantity, whether to move to the second stage of the method.
    Type: Grant
    Filed: November 5, 2012
    Date of Patent: May 3, 2016
    Assignee: ABB RESEARCH LTD
    Inventors: Gerardo Escobar, Sami Pettersson, Leonardo-Augusto Serpa, Ngai-Man Ho, Antonio Coccia, Alexandre Oudalov, Adrian Timbus
  • Patent number: 9257843
    Abstract: Described is a controller, wherein the controller is adapted: to control a transformation ratio of a park transformer of a wind turbine park including wind turbines connected to a first node. The park transformer is connected between a first node and a second node which is connected to a utility grid to which electric energy produced by the wind turbines is to be delivered. Further a wind park and a control method are described.
    Type: Grant
    Filed: June 27, 2012
    Date of Patent: February 9, 2016
    Inventors: Per Egedal, Sathees Kumar, Kaj Skov Nielsen
  • Patent number: 9217418
    Abstract: A method and a system are described for island operation of at least two wind turbines associated with a wind farm, wherein said wind farm is configured for providing power generated by wind turbines in said wind farm to a main grid and wherein the method comprises: detecting at least two or more deactivated wind turbines in said wind farm, said deactivated wind turbines being disconnected from said main grid; configuring at least one islanded local grid for electrically connecting said two or more deactivated wind turbines; activating at least one of said deactivated wind turbine using a black start operation; and, connecting said at least one activated wind turbine and at least one of said deactivated wind turbines to said local grid, said activated wind turbine acting as a power supply for said at least one deactivated wind turbine connected to said local grid.
    Type: Grant
    Filed: April 6, 2010
    Date of Patent: December 22, 2015
    Assignee: XEMC Darwind B.V.
    Inventors: Florentius Joannes Bodewes, Franciscus Leonardus Hendricus Strik
  • Patent number: 9197071
    Abstract: A system for supplying power to a drilling rig has an engine/generator with an output line so as to transfer power therefrom, an energy storage system connected to the engine/generator, and a load connected to the energy storage system such that power from the energy storage system is directly transferred to the load and such that power from the engine/generator is electrically isolated from the load. The engine/generator has a capacity greater than an maximum power requirement of the load. The energy storage system can include at least one battery.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: November 24, 2015
    Inventor: Kevin R. Williams
  • Patent number: 9178456
    Abstract: A power transmission system may include a plurality of renewable-energy devices such as wind turbines or subsea turbines. The devices are connected together in parallel to a subsea cable that carries an ac transmission voltage. Each device includes a turbine assembly that is rotated by wind or water current flows, and a variable speed ac induction generator. A power converter is connected to the subsea cable and is used to interface the generators to a supply network or power grid. The power transmission system is operated such that an indicated operating speed of one or more of the devices is used to control the power converter (e.g. the PWM strategy that is used to open and close the power semiconductor devices) to achieve desired stator electrical quantities at each generator.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: November 3, 2015
    Inventors: Christopher Alan Smith, Matthew James Moreman, Leonard William Burt, Matthew James Cunningham
  • Patent number: 9035498
    Abstract: An electric power control system is provided. The power control system includes a first node to which a plurality of power production entities are connectable for combining their power output signals as a first power signal, a transformer adapted to transformer the first power signal at the first node to a second power signal at a second node connectable to a load, the second power signal having a higher voltage than the first power signal, at least one capacitor connectable to the first node and/or to the second node, a control unit adapted to control the connection of the at least one capacitor to the first node and/or to the second node such that a power loss caused by transmission loss of the power output signals from the power production entities to the load is minimized.
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: May 19, 2015
    Inventor: Kaj Skov Nielsen
  • 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
  • Publication number: 20150123476
    Abstract: An apparatus for collecting energy in connection with a sheave system in a hoisting apparatus provided with a sheave system. The apparatus includes at least one generator including a rotor and at least one stator. The rotor is connected rigidly to a sheave of the sheave system, and the at least one stator is connected rigidly to the sheave system such that when the load of the hoisting apparatus is rising or lowering, said at least one sheave rotates, whereby the rotor rotates simultaneously but the stator does not rotate, whereby electric energy is induced in the stator. The apparatus further includes electric energy storage, a device for modifying induced electric energy and storing it in energy storage; and a device for supplying energy from the energy storage to at least one consumption device. The consumption device may be, for example, a working lamp, sensor, measuring device, communications device, signal device, charging plug or a combination of these mounted in connection with the sheave system.
    Type: Application
    Filed: April 23, 2013
    Publication date: May 7, 2015
    Applicant: KONECRANES PLC
    Inventors: Heikki Mesiä, Lasse Eriksson, Hannu Lindfors, Kim Schlesier, Timo Vuorela, Mika Inkinen, Manu Myry, Pekka Ruuskanen, Mikko Jääskeläinen, Martti Paju
  • Publication number: 20150115721
    Abstract: A power system includes a power generating plant including a plurality of power generators, and an AC collection grid adapted to interconnect the power generating plant and an HVDC converter station. The AC collection grid is adapted to operate outside network regulations, whereby advantages such as simplified control and electronics are achieved. A method of operating a power system is also provided.
    Type: Application
    Filed: June 5, 2012
    Publication date: April 30, 2015
    Applicant: ABB RESEARCH LTD
    Inventors: Staffan Norrga, Antonis Marinopoulos, Konstantinos Papastergiou, Panagiotis Bakas
  • Publication number: 20150102679
    Abstract: A method for compensating at least partially a frequency deviation in a grid is provided in which a grid frequency is determined and the grid frequency is applied to a grid frequency criterion. If the grid frequency meets the grid frequency criterion, a determination is made as to a set of wind turbines from a wind turbine power plant fleet based on the grid frequency criterion, and a command for a transient frequency response is transmitted to the set of wind turbines.
    Type: Application
    Filed: October 15, 2013
    Publication date: April 16, 2015
    Inventors: Kaj Skov Nielsen, Robert J. Nelson
  • Patent number: 9006934
    Abstract: A power feeding apparatus, power receiving apparatus, wireless power feeding system, and method for wireless transfer of power are provided. The power feeding apparatus includes an impedance detector, a controller, a power transmitter, a variable matching circuit, and a signal transmitter. The controller is configured to provide first control information and second control information based on an impedance detected by the impedance detector. The power feeding apparatus' variable matching circuit is configured to change a variable diameter of a power feeding coil according to the first control information. The power receiving apparatus includes a power receiver, a signal receiver, and a variable matching circuit. The power receiving apparatus'variable matching circuit is configured to change a variable diameter of a power feeding coil according to the second control information provided by the power feeding apparatus.
    Type: Grant
    Filed: April 5, 2011
    Date of Patent: April 14, 2015
    Assignee: Sony Corporation
    Inventors: Osamu Kozakai, Takashi Miyamoto, Yuji Murayama
  • Publication number: 20150097437
    Abstract: A system and method for running a plurality of gensets in parallel in a micro-grid system is disclosed. The system and method may include at least one genset configured to run at a load factor of greater than sixty percent, the number of the at least one genset supplying power at any given time including a minimum or less than minimum number of gensets capable of meeting a demand imposed by a load. The system and method may also include a turbo compounding system associated with at least one of the at least one genset, each of the electric turbo compounding systems configured to increase fuel efficiency of the at least one genset.
    Type: Application
    Filed: October 3, 2013
    Publication date: April 9, 2015
    Applicant: Caterpillar Inc.
    Inventors: John Joseph Votoupal, Darrin Johnston
  • Patent number: 8975784
    Abstract: The invention relates to a method for managing an electrical network. The electrical network includes two power centers making it possible for each one to supply several loads, each power center including: an electrical power supply bus, a plurality of reversible converters making it possible to exchange energy between the bus and the various loads , routing means making it possible to vary an association between the converters and the loads, an energy storage element. According to the invention, if for a first of the power centers, the regenerated power cannot be dissipated in the other loads associated with the first center, the regenerative load dissipates its power toward the bus of the second power center.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: March 10, 2015
    Assignee: Thales
    Inventor: Alain Tardy
  • Patent number: 8963378
    Abstract: A method and apparatus for power wiring. In one embodiment, the apparatus comprises a splice box comprising (i) a plug having a plurality of plug pins, each plug pin of the plurality of plug pins for coupling to a conductor within a cable adapted for coupling to a power line; (ii) a first pin receptacle for coupling to a first guide pin of a connector; and (iii) a first pair of retention bars disposed within the first pin receptacle, the first pair of retention bars for retaining the first guide pin.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: February 24, 2015
    Assignee: Enphase Energy, Inc.
    Inventors: Martin Fornage, Raghuveer R. Belur
  • Publication number: 20150022007
    Abstract: A wind turbine generator park (1) for supplying power to a power system (37), the park having an assigned first droop response characteristic for use in responding to an under-frequency occurrence on the power system (37). The park comprises a first comparator (108) for generating a first signal when the park is operating according to a curtailed condition, a second comparator (100) for indicating that a change in a frequency of a voltage or current on the power system (37) is greater than a first threshold value, and a controller (114) responsive to the first and second signals for controlling the park according to a second response characteristic causing the park (1) to supply an amount of power to the power system (37) greater than the power supplied according to the first droop response characteristic.
    Type: Application
    Filed: July 16, 2013
    Publication date: January 22, 2015
    Inventors: Hongtao Ma, Robert J. Nelson, Najlae M. Yazghi, William F. Clark
  • Patent number: 8933594
    Abstract: A vehicle powering wireless receiver for use with a first electromagnetic resonator coupled to a power supply. The wireless receiver includes a load configured to power the drive system of a vehicle using electrical power, and a second electromagnetic resonator adapted to be housed upon the vehicle and configured to be coupled to the load, wherein the second electromagnetic resonator is configured to be wirelessly coupled to the first electromagnetic resonator to provide resonant, non-radiative wireless power to the second electromagnetic resonator from the first electromagnetic resonator; and wherein the field of at least one of the first electromagnetic resonator and the second electromagnetic resonator is shaped using a conducting surface to avoid a loss-inducing object.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: January 13, 2015
    Assignee: WiTricity Corporation
    Inventors: Andre B. Kurs, Aristeidis Karalis, Marin Soljacic, Katherine L. Hall, Morris P. Kesler, Andrew J. Campanella
  • Publication number: 20150008672
    Abstract: The present invention relates a wind turbine generator with an electrical generator, a dump load unit, for dissipating power, a wind turbine power controller and a damping controller both arranged to control wind turbine components based on a damping reference signal, the damping reference signal is a combined signal, and comprises a first reference signal and a second reference signal, the second reference signal is an oscillating part, the wind turbine power controller is controlling the power from the electrical generator according to the first reference signal and the damping controller is controlling the dump load unit to dissipate power according to the second reference signal. The invention also relates to a method for damping oscillations with wind turbine generators.
    Type: Application
    Filed: January 25, 2013
    Publication date: January 8, 2015
    Inventor: Jorge Martinez Garcia
  • Patent number: 8917058
    Abstract: An object of the invention is to make the charging power as high as possible in a battery charging control system for selectively charging a plurality of batteries having different voltages with energy generated by an alternator. To achieve the object, the battery charging control system according to the invention includes an alternator having a variable generation voltage and a plurality of batteries having different charging voltages, wherein maximum generation power defined as the highest power that the alternator can generate and maximum charging power defined as the highest power that each battery can accept are obtained, and a battery for which the charging power is highest is selected to be charged based on a comparison of the maximum generation power and the maximum charging power.
    Type: Grant
    Filed: January 22, 2010
    Date of Patent: December 23, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takuya Hirai, Yuichi Shimasaki, Yoshinori Futonagane
  • Publication number: 20140333141
    Abstract: A photovoltaic (PV)-based AC module (module) includes a PV panel and a three-phase micro-inverter system attached to or integrated directly into the PV panel including a DC/AC inverter stage including first, second and third phase circuitry each having a plurality of semiconductor power switches. A first, second and third control input driver are coupled to drive control inputs of the plurality of semiconductor power switches in the first, second and third phase circuitry, respectively. The module can include a control unit coupled to drive the first, second and third control input driver, and a transceiver and antenna coupled to the control unit for implementing wireless communications.
    Type: Application
    Filed: May 7, 2014
    Publication date: November 13, 2014
    Applicant: University of Central Florida Research Foundation, Inc.
  • Patent number: 8866341
    Abstract: A voltage regulator circuit for providing a regulated output voltage is provided. The voltage regulator circuit includes an error amplifier configured to provide a control signal based on at least a portion of a fed-back output voltage and a reference voltage. A first output stage is configured to operate at a first supply voltage and provide the regulated output voltage based on the control signal. At least one second output stage configured to operate at a second supply voltage different from the first supply voltage and provide the regulated output voltage based on the control signal. A switch-over unit is configured to switch over the control signal between the first output stage and the second output stage.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: October 21, 2014
    Assignee: Infineon Technologies AG
    Inventor: Roman Riederer
  • Patent number: 8860254
    Abstract: Disclosed herein is a power feeding apparatus, including: a power feeding portion adapted to feed an electric power in a wireless manner; and a storage body storing therein the power feeding portion. The storage body includes a main body, a first storage portion formed within the main body and storing therein the power feeding portion, and at least one second storage portion formed so as to be adapted to store or retrieve a power receiving apparatus as a storage object in or from the main body, the electric power of the power feeding portion stored in the first storage portion being adapted to be fed from the at least one second storage portion. At least a magnetically shielding portion is formed in an outer peripheral portion, and the at least one second storage portion forms a magnetically closed space in a state of being stored in the main body.
    Type: Grant
    Filed: June 21, 2011
    Date of Patent: October 14, 2014
    Assignee: Sony Corporation
    Inventors: Osamu Kozakai, Hiroyuki Mita
  • Patent number: 8841787
    Abstract: A method of controlling a plurality of gensets during a failsafe condition is provided. The method may include operating one or more of the gensets according to a modified isochronous control scheme, and operating a remainder of the gensets according an adaptive droop control scheme. The modified isochronous control scheme may include varying the frequency of each isochronous genset with respect to load for lower-range loads and upper-range loads, and maintaining the frequency of each isochronous genset at nominal frequencies for mid-range loads. The adaptive droop control scheme may include adjusting the frequency of each droop genset to match the frequency of the isochronous gensets, and varying the load of each droop genset with respect to frequency for lower-range loads and upper-range loads.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 23, 2014
    Assignee: Caterpillar Inc.
    Inventors: Keith Folken, Matthew Joseph Meinhart, Edward Maurer Schroeder, Andrew William Black
  • Publication number: 20140265608
    Abstract: A system for producing and distributing electrical energy over an electrical network of a geographic area, includes a first entity for generating electrical energy, which operates in a steady state and generates at least a portion of the electrical energy; a second entity for intermittently generating the electrical energy from renewable energy; a third entity, which is capable of operating in a load-following state, the system being sized such that the profile of the change in total energy potential of the geographic area over the span of one year, corresponding to the sum of the profile of the change in the amount of electrical energy distributed by the main entity and the profile of the change in the amount of electrical energy generated by the second entity over the span of one year, is less than the profile of the change in the demand for electrical energy of the network.
    Type: Application
    Filed: July 26, 2012
    Publication date: September 18, 2014
    Inventors: Jonathan Roberts, Xavier Augustin, Jean-Claude Dellinger
  • Patent number: 8836161
    Abstract: A breaker 162 is opened when a pantograph 101 is lowered. The pantograph 101 is connected to an overhead wire 200. Voltage and its phase of the overhead wire are detected by a detector 161. Power is supplied from a power storage device 150c to a tertiary winding 112c via a power converter 14c such that a primary side of the main transformer 110 has the same voltage and phase as the overhead wire so as to reversely excite the main transformer 110. When the voltage of the main transformer 110 has the same phase as the voltage of the overhead wire 200, the breaker 162 is turned on and then the pantograph 101 is raised, to connect the overhead wire 200 and the main transformer 110 to each other, thereby preventing the occurrence of an excitation inrush current to the main transformer 110.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: September 16, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masayuki Nogi, Katsuhisa Inagaki, Kazuaki Yuuki, Yosuke Nakazawa, Satoshi Koizumi
  • Publication number: 20140246914
    Abstract: A power distribution system comprising a point of common connection that receives electric power supplied by a first power generation system and a second generation system, with the second power generation system that comprises a renewable electric power generator; a transmission line operatively connected to the point of common connection for conducting the electric power between the point of common connection and an external AC electric network. The power distribution furthermore comprises a capacitive compensator connected in series with the transmission line to compensate for a reactive power component of the electric power conducted by the transmission line; and a shunt arranged flexible AC transmission system that mitigates a sub-synchronous resonance effect caused at least in part by the capacitive compensator. A flexible AC transmission system controller of the flexible AC transmission system comprises a damping effect on sub-synchronous oscillations included in the sub-synchronous resonance.
    Type: Application
    Filed: September 12, 2012
    Publication date: September 4, 2014
    Inventors: Rajiv Chopra, Reginald Mendis, Marek Furyk
  • Patent number: 8823213
    Abstract: It is an object of the present invention to suppress such a situation that electric power selling becomes impossible while the deterioration of supply power is prevented. The electric power selling system of the present invention comprises a solar battery 3 as a power generator, and a control unit 7 which is connected with the solar battery 3 and a distribution line and configured to convert output voltage of the solar battery 3 into variable voltage for electric power selling. The electric power selling system further comprises a transmitter 60 connected with the distribution line, said transmitter 60 being configured to measure voltage of the distribution line and to supply the control unit 7 with an instruction value obtained based on the measured voltage value. The control unit 7 is configured to convert the output voltage of the solar battery 3 into the voltage for electric power selling based on the instruction value.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: September 2, 2014
    Assignee: Panasonic Corporation
    Inventor: Takehiro Matsuda
  • Publication number: 20140232198
    Abstract: The invention relates to a method for damping grid oscillations. The oscillations may be damped by controlling e.g. wind turbine generators to inject power to the grid in anti-phase with the grid oscillations. Instead of controlling one or more wind turbine generators to generate the same anti-phase power signal, a plurality of wind turbine generators are controlled so that each of them only generates a part of the anti-phase power signal, but so that all of the wind turbine generators in combination generates the entire anti-phase power signal.
    Type: Application
    Filed: September 28, 2012
    Publication date: August 21, 2014
    Inventors: Jorge Martinez Garcia, Florin Lungeanu
  • Publication number: 20140225446
    Abstract: The present invention concerns a method of feeding electric power into an electric network wherein the feed is effected by means of at least one wind power installation with a first feed-in arrangement at a feed-in point into the electric network, and the feed is effected in dependence on electric parameters in the network and measurement values of the electric parameters or measurement values for determining the electric parameters are detected at measurement times at predetermined time intervals and wherein the measurement times are synchronized to an external time signal available outside the first feed-in arrangement.
    Type: Application
    Filed: August 14, 2012
    Publication date: August 14, 2014
    Inventor: Helge Giertz
  • Publication number: 20140191579
    Abstract: A power system for data center, which comprises: a critical electrical equipment, an alternating current (AC) transformer, an AC power distribution unit (PDU), a rectifier transformer, and a DC PDU. The critical electrical equipment is disposed in the data center. The AC transformer is utilized to receive a first high AC electrical power from a first power utility and transform it to a low AC electrical power, and the AC PDU receives the low AC electrical power and applies the low AC electrical power to the critical electrical equipment of the data center. Further, the rectifier transformer is utilized to receive a second high AC electrical power from a second power utility and transform and rectify it to a low direct current (DC) electrical power, and a DC PDU receives the low DC electrical power and applies the low DC electrical power to the critical electrical equipment.
    Type: Application
    Filed: January 10, 2013
    Publication date: July 10, 2014
    Applicant: GCCA INC.
    Inventor: Oliver Szu
  • Patent number: 8766479
    Abstract: A plurality of generators can be connected in parallel to a common electrical bus. Each generator has a controller that regulates the voltage and frequency of the electricity being produced. Before a given generator connects to the electrical bus, its controller senses whether electricity is present on the bus and if not, the connection is made. Otherwise, the controller synchronizes the electricity being produced to the electricity is present on the bus before the connection occurs. The controller in each generator may also implement a load sharing function which ensures that the plurality of generators equitably share in providing the total amount of power demanded by the loads. The load sharing can be accomplished by controlling the generators to operate a substantially identical percentages of their individual maximum power generation capacity.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: July 1, 2014
    Assignee: Kohler Co.
    Inventors: Douglas W. Dorn, Isaac S. Frampton
  • Publication number: 20140175890
    Abstract: Disclosed herein is a method for generating an injected current of a fuel cell stack performed in an apparatus for generating an injected current of a fuel cell stack, the method including: extracting a first frequency current and a second frequency current by passing alternating currents of different frequencies through a plurality of filters, respectively; generating a summed frequency current by summing the first frequency current and the second frequency current; and applying the summed frequency current to the fuel cell stack. Therefore, it is possible to operate the fuel cell stack by applying the summed current obtained by summing the alternating current for calculating the total harmonic distortion (THD) and the alternating current for calculating the impedance to the fuel cell stack.
    Type: Application
    Filed: December 19, 2013
    Publication date: June 26, 2014
    Applicant: Hyundai Autron Co., Ltd.
    Inventors: Hyun-Seok Park, Sung-Mog Yu, Jin-Ho Cho
  • Publication number: 20140175880
    Abstract: An energy harvesting apparatus includes: a capacitor configured to store energy generated by an energy harvesting element; and a switch connected to the capacitor and configured to switch energy supply from the capacitor to a load based on a capacitor voltage with which the capacitor is charged. An energy harvesting system includes: energy harvesting elements; energy harvesting apparatuses which are provided to respectively correspond to the energy harvesting elements; and a load as an energy supply destination connected to the energy harvesting apparatuses.
    Type: Application
    Filed: October 21, 2013
    Publication date: June 26, 2014
    Applicant: ROHM CO., LTD.
    Inventors: Koichi MIYANAGA, Jun MAEDE
  • Publication number: 20140167516
    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: Application
    Filed: December 17, 2012
    Publication date: June 19, 2014
    Inventors: Slobodan Gataric, Jinhui Zhang
  • Publication number: 20140152112
    Abstract: A parallel operation control method for different type power generation apparatuses to shift the power generation apparatuses having respective different drooping characteristics, in which the drooping characteristic is defined as a characteristic of decrease of a rated frequency along with an increase of a load, from independent operation of the power generation apparatuses under suitable drooping characteristics to parallel operation thereof to drive a common drive target, includes determining a load of one of the power generation apparatuses by subtracting a load of the other of the power generation apparatuses from a predetermined required load; changing a drooping characteristic of the one of the power generation apparatuses so as to coincide with a drooping characteristic of the other of the power generation apparatuses; and controlling the one of the power generation apparatuses so as to maintain frequency at the time of changing the drooping characteristic.
    Type: Application
    Filed: June 19, 2012
    Publication date: June 5, 2014
    Inventors: Mitsuru Chida, Kazunori Sato, Motohiro Inoue, Koushichi Tateishi
  • Patent number: 8742616
    Abstract: A bulk energy storage device for an energy source. The energy storage device includes a circular or conveyor, such as a rail track, which may be formed with slopes. An electrical conductor, such as a third rail or overhead electric cable, connects to an electric grid. Coupled masses, such as rail cars, which travel on the conveyor, have motor/generators that are electrically connected to the conductor. The coupled masses can be raised on a magnetic field and driven by a linear electric motor having a stator embedded in the track and a rotor attached to the undersurface of the masses. Power from the grid is drawn via the third rail to propel and store energy in the ring of masses. When the grid needs to draw power from storage, the linear motor acts as a generator, supplying power to the grid by converting mass momentum into electric power.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: June 3, 2014
    Assignee: Dehlsen Associates, LLC.
    Inventors: James G. P. Dehlsen, Mauricio Quintana