公开(公告)号：US11949234B2

公开(公告)日：2024-04-02

申请号：US17525862

申请日：2021-11-12

Applicant: Electric Power Science & Research Institute of State Grid Tianjin Electric Power Company ,  State Grid Tianjin Electric Power Company ,  State Grid Corporation of China

Inventor： Shiqian Ma ,  Bin Wu ,  Yun Liu ,  Xianxu Huo ,  Yi Ding ,  Lei Wu ,  Tianhao Wang

IPC: H02J3/00 ,  H02J3/08

CPC classification number: H02J3/0073 ,  H02J3/003 ,  H02J3/08

Abstract: A method for making a spatio-temporal combined optimal scheduling strategy of a mobile energy storage (MES) system includes: inputting data of a power system, a traffic system, and an MES system; setting a time interval, and initializing a time interval counter; inputting real-time fault, traffic, and MES data; and performing rolling optimization and solving, and delivering regulation decision instructions of the MES system, till a fault is removed. The core of the present disclosure is to propose a spatio-temporal combined optimal model of the MES system to describe spatio-temporal coupling statuses of an energy storage vehicle, a traffic network, and a power distribution network. The present disclosure provides guidance for an optimal scheduling decision of the MES system by properly regulating a traveling path and charging and discharging power of the MES system, thereby supporting high-reliability operation of the power distribution network.

公开(公告)号：US11699904B2

公开(公告)日：2023-07-11

申请号：US17365520

申请日：2021-07-01

Applicant: Aclara Technologies LLC

Inventor： Christopher Fleck ,  Roger Smith ,  Rebecca Ross

IPC: H04L7/02 ,  H02J3/08

CPC classification number: H02J3/08 ,  H04L7/02

Abstract: Systems for determining a phase of a device coupled to an electrical distribution system. The system includes a number of gateway devices configured to transmit a synchronization signal. The gateway device receives a node response message from a first node device that includes a duration value indicating a time between a receipt of the transmitted synchronization signal and a detected zero crossing. The gateway device compares the duration value against duration values received from node devices with a known phase connection and determines a phase of the first node device based on the comparison.

公开(公告)号：US20230208137A1

公开(公告)日：2023-06-29

申请号：US18177975

申请日：2023-03-03

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Francisco Daniel FREIJEDO FERNÁNDEZ

IPC: H02J3/08 ,  H02M1/42 ,  H02M1/00

CPC classification number: H02J3/08 ,  H02M1/4208 ,  H02M1/0009 ,  H02M1/0087

Abstract: Example unity power factor converter, (UPFC) operating methods and apparatus are described. In one example, the UPFC comprises a closed-loop control for regulation of an input current from a power grid in accordance with a reference variable for the input current. The UPFC is configured to determine amplitudes of frequency components of the input current, and establish a phase angle of the reference variable in dependence of a phase angle of a fundamental frequency component of an input voltage from the power grid and of the amplitudes of the frequency components.

公开(公告)号：US09923367B2

公开(公告)日：2018-03-20

申请号：US14866984

申请日：2015-09-27

Applicant: State Grid Hebei Electric Power Research Institute ,  Hebei Electric Power Commissioning Institute

Inventor： Wenping Hu ,  Jie Guo ,  Lei Wang ,  Xiaobo Duan

IPC: H02J1/10 ,  H02J3/38 ,  H02J7/34 ,  H02J1/00 ,  H02J3/08 ,  H02J1/06 ,  H02H7/122

CPC classification number: H02J1/00 ,  H02H7/122 ,  H02J1/06 ,  H02J3/08

Abstract: Provided are an anti-islanding method for a distributed generator in a direct current distribution grid and an anti-islanding device therefor. The method includes: feeding an alternating voltage component into an output end of the AC/DC interface transverter, a frequency of the alternating voltage component being less than the power frequency; sampling a first voltage signal of an output end of the DC/DC transverter; extracting a first effective value of an alternating signal included in the first voltage signal; comparing the first effective value with a first preset voltage; and controlling the distributed generator to stop operation, in a case that it is determined that the first effective value is less than the first preset voltage, which indicates that islanding occurs for the distributed generator.

公开(公告)号：US20170358980A1

公开(公告)日：2017-12-14

申请号：US15598435

申请日：2017-05-18

Applicant: DYNAPOWER COMPANY LLC

Inventor： Apurva SOMANI ,  John C. PALOMBINI

IPC: H02M1/088 ,  H02M7/797 ,  H02M5/458 ,  H02M7/539 ,  H02J3/38 ,  H02M7/00 ,  H02J3/08 ,  H02J3/32 ,  H02J9/00 ,  H02J3/40 ,  H02M3/00 ,  H02M1/36 ,  H02M1/00

CPC classification number: H02M1/088 ,  H02J3/08 ,  H02J3/32 ,  H02J3/38 ,  H02J3/381 ,  H02J3/40 ,  H02J9/005 ,  H02J2003/388 ,  H02M1/36 ,  H02M3/00 ,  H02M5/4585 ,  H02M7/00 ,  H02M7/539 ,  H02M7/797 ,  H02M2001/0032 ,  Y02B70/1441 ,  Y02B70/145 ,  Y02B70/16 ,  Y02P80/14

Abstract: A power system for power conversion between at least one power source and a grid is disclosed. The power system includes a power converter having a plurality of semiconductor switches, configured to adapt a power supply to a desired output; and a controller for controlling the power converter in an active mode and an active standby mode, the controller configured to: determine to enter into the active mode or the active standby mode; based on the active mode or the active standby mode is determined, control the power converter to be in a gating state with the grid or to be in a non-gating state with the grid.

公开(公告)号：US20170237256A1

公开(公告)日：2017-08-17

申请号：US15502716

申请日：2014-08-11

Applicant: ABB Schweiz AG

Inventor： Ritwik MAJUMDER

IPC: H02J3/06 ,  H02J3/40 ,  H02J3/08

CPC classification number: H02J3/06 ,  H02J3/08 ,  H02J3/40 ,  H02J3/42

Abstract: A method performed in an electrical microgrid for facilitating connection of a first and second AC power networks. The method includes, when the power networks are disconnected, from the second power network, controlling the AC frequency of the first power network based on the AC frequency of the second power network for ensuring that when the first and second networks are connected power will flow from the power network of the first and second power networks having a higher frequency to the power network of the first and second power networks having a lower frequency. The method also includes, after the controlling, connecting the first power network to the second power network, whereby power, at the instant of connecting, flows from the power network of the first and second power networks having a higher frequency to the power network of the first and second power networks having a lower frequency.

公开(公告)号：US09735719B2

公开(公告)日：2017-08-15

申请号：US14705409

申请日：2015-05-06

Applicant: ALSTOM Technology Ltd

Inventor： Luis Diez-Maroto ,  Luis Rouco-Rodriguez ,  Fidel Fernandez-Bernal ,  Idriss El-Merdoui

IPC: H02P9/00 ,  H02P9/02 ,  H02J3/08 ,  H02P9/30

CPC classification number: H02P9/02 ,  H02J3/08 ,  H02P9/30

Abstract: The present invention relates to the field of generator technology. It is an object of the invention to control the stability in an electric grid in which a plurality of generators are connected providing electric power to the grid. A static exciter system includes a control device for controlling the field voltage of the field winding of at least two generators connected to a grid system via a busbar.

公开(公告)号：US09720395B2

公开(公告)日：2017-08-01

申请号：US14543969

申请日：2014-11-18

Applicant: Di Shi ,  Ratnesh Sharma ,  Yusheng Luo

Inventor： Di Shi ,  Ratnesh Sharma ,  Yusheng Luo

IPC: H02J3/40 ,  H02J3/42 ,  H02J3/44 ,  G05B19/042

CPC classification number: G05B19/042 ,  G05B2219/2639 ,  H02J3/08 ,  H02J3/40 ,  H02J2003/388

Abstract: A method and system are provided. The method includes synchronously reconnecting a microgrid to a main grid after islanding of the microgrid. The synchronously reconnecting step includes calculating a phase angle difference between synchrophasor measurements collected from a common coupling on the main grid and synchrophasor measurements collected from a common coupling on the microgrid. The synchronously reconnecting step further includes calculating, by a controller, a frequency reference deviation based on the phase angle difference. The synchronously reconnecting step also includes adjusting a frequency of the diesel generator based on the frequency reference deviation.

公开(公告)号：US09705328B2

公开(公告)日：2017-07-11

申请号：US14234332

申请日：2012-07-19

Applicant: Tomonari Kusunose

Inventor： Tomonari Kusunose

IPC: H02J3/00 ,  H02J3/32 ,  H02J3/38 ,  H02J7/35 ,  H02J3/08

CPC classification number: H02J3/006 ,  H02J3/08 ,  H02J3/32 ,  H02J3/383 ,  H02J7/35 ,  Y02E10/563 ,  Y02E10/566 ,  Y02E70/30 ,  Y10T307/344

Abstract: A startup control method of controlling startup of a PV PCS 150 configured to perform interconnected operation in which a PV 100 is interconnected to a grid 10 to supply power to a load 400: supplies power from independent operation output of the PV PCS 150 to a storage PCS 250 by an independent operation that does not interconnect the PV 100 to the grid 10 before starting the interconnected operation; measures the output power amount of the PV 100 or the PV PCS 150 when the power is supplied to the storage PCS 250; and stops the independent operation to start the interconnected operation when the measured output power amount is larger than a predetermined amount.

公开(公告)号：US09614577B2

公开(公告)日：2017-04-04

申请号：US13949442

申请日：2013-07-24

Applicant: ABB RESEARCH LTD

Inventor： Dacfey Dzung

IPC: H02H3/28 ,  G06F11/16 ,  H04B1/7073 ,  H02J3/08 ,  H04J3/06

CPC classification number: H04B1/7073 ,  G06F11/1658 ,  H02H3/28 ,  H02J3/08 ,  H04J3/0667

Abstract: A method and arrangement are provided for time synchronization between two geographically separated stationary clocks, such as first and second clocks located respectively at first and second ends of an AC power line. A first representation of an oscillating power line quantity is produced by measuring or recording the power line quantity at the first end of the power line, and time-stamping the first representation by the first clock. A second representation of the same oscillating power line quantity is produced by measuring the power line quantity at the second end of the power line, and time-stamping the second representation by the second clock. The first and second representations are compared to determine a clock offset between the first and second clocks. Based on the comparison, one or both of the first and second clocks are adjusted to reduce the determined clock offset.