公开(公告)号：US20210175711A1

公开(公告)日：2021-06-10

申请号：US16071093

申请日：2017-03-06

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Jin YOSHIZAWA ,  Kenichi WATANABE ,  Toshifumi ISE ,  Jia LIU

IPC: H02J3/26 ,  H02J13/00 ,  H02M7/44 ,  G05B11/42

Abstract: A power supply system includes: a synchronous generator connected to a three-phase power distribution system that is connected to a consumer load; an inverter that is connected to the power distribution system, supplies power to the consumer load, and compensates for unbalanced current of the synchronous generator; and a control device that generates a gate command for controlling the inverter. The control device: generates, based on a three-phase voltage and current output from the inverter, a target output voltage which is an amplitude of a vector in a complex plane combining voltages of three phases, and a target output phase which is a phase of the vector in the complex plane combining the voltages of three phases; generates a first compensation voltage, based on a current negative-phase-sequence component relating to the synchronous generator; and generates a gate command from the generated values.

公开(公告)号：US10901489B2

公开(公告)日：2021-01-26

申请号：US15464143

申请日：2017-03-20

Applicant: STEM, INC.

Inventor： Lynn Smith ,  Stacey Reineccius

IPC: G06F1/3287 ,  G05B15/02 ,  G06F1/26 ,  G06F1/3296 ,  H02J3/26 ,  G05F5/00

Abstract: In a multiphase electrical power construction and assignment, a processor: determines a phase and voltage configuration for bi-directional power device pairs; determines a given bi-directional power device pair is to be coupled to a given phase connection based on the configuration; determines whether the given bi-directional power devices in the given bi-directional power device pair are to be coupled to each other; confirms that the given bi-directional power device pair is not coupled to any of the plurality of phase connections; couples the given bi-directional power device pair to the given phase connections, where power signals of the given bi-directional power device pair are synchronized with a power signal of the given phase connection; and in response to determining that the given bi-directional power devices are to be coupled to each other, couples each of the bi-directional power devices to a short bus.

公开(公告)号：US10855198B2

公开(公告)日：2020-12-01

申请号：US16293727

申请日：2019-03-06

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Michiya Mori ,  Gaku Kamitani

IPC: H02M7/12 ,  G06F1/26 ,  H02J3/26 ,  H02M7/23 ,  H02M7/08 ,  H02M7/217 ,  H02M1/00

Abstract: A power supply apparatus includes converters connected in parallel to a three-phase alternating-current power supply, input current detectors that detect current flowing through the respective three phases of the three-phase alternating-current power supply, and load current detectors that detect load current of the converters. Each of the converters includes AC-DC converters inputs of connected to two of the three phases. The AC-DC converters are connected in parallel to each other using a common output. The AC-DC converters that are driven maintain balance of output current. A controller determines whether switching between a driven state and a stopped state of the respective AC-DC converters is performed based on detection results from the load current detectors and switches between the driven state and the stopped state of the respective multiple AC-DC converters based on detection results by the input current detectors.

公开(公告)号：US10757830B1

公开(公告)日：2020-08-25

申请号：US13418023

申请日：2012-03-12

Applicant: Andrew Errato, Jr. ,  Tyrone Mellon

Inventor： Andrew Errato, Jr. ,  Tyrone Mellon

IPC: H02J3/26 ,  H05K7/20

Abstract: A system and method for managing and distributing power is provided, wherein the system includes an electrical power input for receiving three-phase power from an external power source, a first electrical power outlet and a second electrical power outlet. The system further includes current measuring components configured to measure the current on all phases of electrical power being drawn by electrical loads connected to the first electrical power outlet and the second electrical power outlet. The system also includes a processing device to analyze measured current for all phases of electrical power being drawn by the electrical loads. Furthermore, the system includes phase balancing components configured to modify the current for each of the phases of the electrical power being drawn by the electrical loads connected to the first electrical power outlet and the second electrical power outlet such that the current for each phase is substantially balanced.

公开(公告)号：US20200212676A1

公开(公告)日：2020-07-02

申请号：US16699602

申请日：2019-11-30

Applicant: The George Washington University

Inventor： Payman DEHGHANIAN ,  Shiyuan WANG

IPC: H02J3/26 ,  G06F17/14 ,  H03M7/30 ,  G06N3/04

Abstract: Waveforms in power grids typically reveal a certain pattern with specific features and peculiarities driven by the system operating conditions, internal and external uncertainties, etc. This prompts an observation of different types of waveforms at the measurement points (substations). An innovative next-generation smart sensor technology includes a measurement unit embedded with sophisticated analytics for power grid online surveillance and situational awareness. The smart sensor brings additional levels of smartness into the existing phasor measurement units (PMUs) and intelligent electronic devices (IEDs). It unlocks the full potential of advanced signal processing and machine learning for online power grid monitoring in a distributed paradigm. Within the smart sensor are several interconnected units for signal acquisition, feature extraction, machine learning-based event detection, and a suite of multiple measurement algorithms where the best-fit algorithm is selected in real-time based on the detected operating condition. Embedding such analytics within the sensors and closer to where the data is generated, the distributed intelligence mechanism mitigates the potential risks to communication failures and latencies, as well as malicious cyber threats, which would otherwise compromise the trustworthiness of the end-use applications in distant control centers. The smart sensor achieves a promising classification accuracy on multiple classes of prevailing conditions in the power grid and accordingly improves the measurement quality across the power grid.

公开(公告)号：US10530161B2

公开(公告)日：2020-01-07

申请号：US14985319

申请日：2015-12-30

Applicant: SolarCity Corporation

Inventor： Lesley Chisenga ,  Aaron Jungreis ,  Paul Garrity

IPC: H02J3/00 ,  H02J3/38 ,  H02J1/10 ,  H02J3/26 ,  H02M7/44

Abstract: Some embodiments of the invention provide a method for balancing the power output to each phase of a set of micro-inverters. The method of some embodiments is performed by a gateway, which receives output messages from a plurality of micro-inverters. The gateway identifies the phase of each micro-inverter and calculates the output of the plurality of micro-inverters to each power line of a multi-phase system. The gateway then sends control signals to the micro-inverters to control the output of each micro-inverter to maintain a balanced aggregate power output to each phase of the power grid.

公开(公告)号：US20190369145A1

公开(公告)日：2019-12-05

申请号：US15645729

申请日：2017-07-10

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Amit Kumar GUPTA ,  John Godsk NIELSEN ,  Liang YANG

IPC: G01R19/165 ,  F03D9/25 ,  F03D7/02 ,  F03D7/04 ,  H02J3/26 ,  H02J3/38 ,  H02P9/04 ,  F03D7/00 ,  G01R19/10 ,  H02K7/18

Abstract: A method for operating a power generation system coupled to a power grid during a grid unbalance event, a method for determining an injection current to be supplied into a power grid by a power generation system, and a method for addressing an asymmetric grid fault in a power grid connected to a power generation system are provided. The methods may be carried out based on a reactive or an active power/current priority.

公开(公告)号：US20190190267A1

公开(公告)日：2019-06-20

申请号：US15846486

申请日：2017-12-19

Applicant: EUROTHERM LIMITED

Inventor： Remi CABAUSSEL

IPC: H02J3/18 ,  H02J3/26 ,  H02P23/26

CPC classification number: H02J3/1892 ,  H02J3/26 ,  H02M5/271 ,  H02P23/26

Abstract: A method for operating an unbalanced load manager for a three-phase induction motor or heater, includes receiving, by a load manager, values representative of current flow sensed by current sensors and voltages sensed by voltage taps corresponding to phases of a three-phase power system providing power to the motor or heater. The method includes detecting, by the load manager, a transition from positive or negative to zero current, to measure a phase shift between line-to-line and current. The method further includes synchronizing, by the load manager, firing from line-to-line signal to line-to-neutral signal of phases of the three-phase power system, using the measured phase shift between line-to-line and current.

公开(公告)号：US10038320B2

公开(公告)日：2018-07-31

申请号：US14894130

申请日：2014-05-28

Applicant: Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Inventor： Sylvain Guillemin ,  Rémi Vial

IPC: H02J3/26

CPC classification number: H02J3/26 ,  Y02E40/50

Abstract: A method for balancing a polyphase network for supplying an installation including a plurality of sockets for plugging-in electrical equipment, wherein a phase selector is inserted for each socket, between a system for supplying a polyphase voltage and the socket, and intercepts a command signal for energizing the socket. Once an energizing command has been received from one of the monophase equipments, the least charged phase is selected for powering the equipment, the evaluation of the least charged phase being carried out upstream of the system.

公开(公告)号：US10027247B2

公开(公告)日：2018-07-17

申请号：US14758974

申请日：2013-10-22

Applicant: SMA SOLAR TECHNOLOGY AG

Inventor： Claus Allert ,  Thorsten Buleo ,  Markus Hopf

IPC: H02J3/38 ,  H02J3/26 ,  H02M7/44 ,  H02J3/34 ,  H02J9/06

Abstract: The invention relates to an inverter with at least one DC input for connecting to an energy producing device and/or an energy store and with a multiphase AC output for connecting to a local energy distribution network, which is coupled to a likewise multiphase master energy supply network via a switching device. The inverter is characterised in that it has a control terminal for connecting to the switching device such that individual phases of the local energy distribution network can be selectively connected to or disconnected from corresponding phases of the energy supply network via the control terminal, and is intended, in the event of a network error of at least one but not all phases of the energy supply network, to separate, via the control terminal, the at least one defective phase of the energy supply network from the corresponding phase of the local energy distribution network and to supply the at least one separated phase of the local energy distribution network with network-compatible alternating voltage. The invention also relates to a method for operating such an inverter and to an energy supply installation with an inverter.