公开(公告)号：US12051902B2

公开(公告)日：2024-07-30

申请号：US18105843

申请日：2023-02-04

Applicant: ELECTRIC POWER RESEARCH INSTITUTE. CHINA SOUTHERN POWER GRID

Inventor： Hong Rao ,  Guiyuan Li ,  Weihuang Huang ,  Yan Li ,  Shukai Xu

IPC: H02J3/24 ,  H02J3/00 ,  H02J3/06 ,  H02J3/36

CPC classification number: H02J3/241 ,  H02J3/00125 ,  H02J3/06 ,  H02J2003/365

Abstract: Disclosed are a voltage source converter based high voltage direct current (VSC-HVDC) high-frequency resonance suppression method, system, and device. The method includes: when an effective value of an actually input alternating current (AC) voltage is reduced from a normal value to meet a preset condition, making the virtual electrical quantity completely equal to the actual electrical quantity, and performing full real-time tracking for the actual electrical quantity to improve dynamic characteristics of a power system at the moment of a fault; and after performing the full tracking for a period of time, if the effective value of the actual AC voltage is less than a preset threshold, performing adaptive tracking until the actual electrical quantity recovers to a stable value. The present disclosure can reduce a risk of high-frequency resonance of a VSC-HVDC, avoid deteriorating dynamic characteristics of the VSC-HVDC, and improve safety of fault ride-through of the VSC-HVDC.

公开(公告)号：US20240213779A1

公开(公告)日：2024-06-27

申请号：US18278796

申请日：2022-02-17

Applicant: Siemens Gamesa Renewable Energy Innovation & Technology S.L.

Inventor： Pedro Luis Camunas Garciamiguel ,  Manuel Garcia Plaza ,  Jesus Lopez Merino ,  Andrés Peña Asensio

IPC: H02J3/24 ,  H02J3/38 ,  H02J7/00

CPC classification number: H02J3/241 ,  H02J3/381 ,  H02J7/00712 ,  H02J2203/20 ,  H02J2300/24 ,  H02J2300/28

Abstract: A control system providing a control signal to an energy storage system to reduce power variability of an energy generation system. The energy storage system is coupled to the power output of the energy generation system and configured to at least one of receive and provide electrical power in response to the control signal. The control system includes a monitoring unit to monitor the power output and to provide a respective monitoring signal. The control system further includes a control signal generation unit to generate the control signal from the monitoring signal, and implement a filtering unit that has a band pass response. The filtering unit passes a predetermined frequency band of the monitoring signal and the control signal generation unit is configured to generate the control signal in the frequency band to compensate power variations of the power output of the energy generation system in the frequency band.

公开(公告)号：US20240128754A1

公开(公告)日：2024-04-18

申请号：US18263110

申请日：2021-02-19

Applicant: KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATION

Inventor： Yoko SAKAUCHI ,  Yukina AKIYAMA ,  Yuki KUDO ,  Shunsuke KAWACHI ,  Koji TOBA

IPC: H02J3/24 ,  H02J3/32 ,  H02J3/46 ,  H02M7/48

CPC classification number: H02J3/241 ,  H02J3/32 ,  H02J3/46 ,  H02M7/48 ,  H02J2300/24

Abstract: A startup method and startup program for microgrid that enable to stably start up the microgrid without producing frequency fluctuation is provided. An embodiment of the present disclosure is a startup method for microgrid configured by a plurality of inverter power supplies independently sharing a load and divided into a master that starts up first and a slave that starts up secondly and later, the startup method comprising: a master initial startup step of initially starting up the master in a CVCF mode; a slave initial startup step of initially starting up the slave in a grid interconnection mode; and a control mode changing step of the master and the slave changing control modes thereof when output fluctuation of the master and the slave becomes a predetermined threshold or less or when the master and the slave or other inverter power supplies become a predetermined operation state while output voltage of said master and said slave becomes a predetermined threshold or less.

公开(公告)号：US11942785B2

公开(公告)日：2024-03-26

申请号：US17076084

申请日：2020-10-21

Applicant: SMA Solar Technology AG

Inventor： Sebastian Umlauf

IPC: H02M7/44 ,  H01F27/26 ,  H01F27/28 ,  H01F27/40 ,  H02J3/01 ,  H02J3/24 ,  H02J3/26 ,  H02J3/38 ,  H02J3/36

CPC classification number: H02J3/01 ,  H01F27/26 ,  H01F27/28 ,  H01F27/40 ,  H02J3/241 ,  H02J3/26 ,  H02J3/38 ,  H02M7/44 ,  H02J3/36

Abstract: The disclosure relates to a power electronics device having at least two inverters and a transformer apparatus having a core arrangement, at least one primary winding and at least one secondary winding that wind around the core arrangement at least in sections.

公开(公告)号：US20240055859A1

公开(公告)日：2024-02-15

申请号：US17997537

申请日：2021-07-30

Applicant: NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS ,  STATE GRID ELECTRIC POWER REREARCH INSTITUTE CO. LTD

Inventor： Dong YUE ,  Chunxia DOU ,  Zhijun Zhang ,  Wenbin YUE ,  Xiaohua DING ,  Jianbo LOU ,  Yanman LI ,  Kun HUANG ,  Tao HAN

IPC: H02J3/24 ,  H02J3/28 ,  H02J3/48

CPC classification number: H02J3/241 ,  H02J3/28 ,  H02J3/48 ,  H02J2300/28 ,  H02J2300/40 ,  H02J2300/24

Abstract: A source-grid-load-storage networked collaborative frequency control method is disclosed, which comprises acquiring total active power ΔP to be regulated during a secondary frequency regulation process of a power grid; performing frequency regulation by source-grid-load-storage of the power distribution system, allocating power regulation capacities, and determining whether the desired total active power is met after the frequency regulation; if the desired total active power is met, determining whether power of power generation units is out of limit; if the power of the power generation units is not out of limit, keeping active power of the power distribution system in balance to complete frequency regulation of the power grid; if the power of the power generation units is out of limit, correcting the power regulation capacities of the power generation units of the source-grid-load-storage and compensating a power difference to keep the active power of the power distribution system in balance.

公开(公告)号：US20230283077A1

公开(公告)日：2023-09-07

申请号：US18146138

申请日：2022-12-23

Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

Inventor： Grégory PAÏS ,  Tony DELAPLAGNE ,  Laurent VINIT

IPC: H02J3/24 ,  H02J3/38 ,  G05B19/042

CPC classification number: H02J3/241 ,  H02J3/38 ,  G05B19/042 ,  G05B2219/2639

Abstract: A method for controlling power supplied to an electrical network having a rated frequency, by an electrical production set with a hydroelectric plant and a battery energy storage system, includes determining, from a model of the hydroelectric plant, a theoretical power of stabilization of the frequency of the electrical network by the hydroelectric plant, the theoretical stabilization power being relative to a production of the hydroelectric plant alone for the stabilization of the frequency of the electrical network, when setpoints for production members of the hydroelectric plant are implemented.

公开(公告)号：US20230253793A1

公开(公告)日：2023-08-10

申请号：US18010429

申请日：2020-10-30

Applicant: CHINA ELECTRIC POWER RESEARCH INSTITUTE COMPANY LIMITED ,  STATE GRID CORPORATION OF CHINA

Inventor： Yaping Li ,  Shengchun Yang ,  Jianguo Yao ,  Jian Geng ,  Feng Li ,  Wenbo Mao ,  Yong Wang ,  Jun Liu ,  Kedong Zhu ,  Jiahao Yan ,  Jiantao Liu ,  Xiaorui Guo ,  Jing Zhou ,  Liwen Wang ,  Peng Xu ,  Lingling Pan

IPC: H02J3/24 ,  H02J3/46

CPC classification number: H02J3/241 ,  H02J3/46

Abstract: Provided an intermittent characteristic-based demand-side resource coordination control method and system. The method includes: receiving a control request, where the control request is used for requesting control of demand-side resources having an intermittent characteristic; determining a target total control quantity of demand-side resources; determining a coordination strategy of multiple demand-side resources and an action quantity of each of the multiple demand-side resources; and performing coordinated control on the multiple demand-side resources based on the target total control quantity of demand-side resources, the coordination strategy, and the action quantity of each of the multiple demand-side resources.

公开(公告)号：US11705729B2

公开(公告)日：2023-07-18

申请号：US13251823

申请日：2011-10-03

Applicant: Shu Yuen Ron Hui ,  Chi Kwan Lee ,  Felix Fulih Wu

Inventor： Shu Yuen Ron Hui ,  Chi Kwan Lee ,  Felix Fulih Wu

IPC: H02J3/16 ,  H02J3/18 ,  H02J3/12 ,  H02J3/24

CPC classification number: H02J3/18 ,  H02J3/12 ,  H02J3/16 ,  H02J3/1814 ,  H02J3/1842 ,  H02J3/241 ,  Y02E40/30

Abstract: The present invention provides a power control circuit connectable to a load adapted to receive a power supply, the power control circuit adapted to absorb power from the power supply and adapted to deliver power to the power supply to stabilize at least one electrical parameter of the power supply. The present invention also provides an associated method of stabilizing at least one electrical parameter of a power supply connectable to a load, the method including absorbing power from the power supply or delivering power to the power supply. The at least one electrical parameter of the power supply includes parameters such as voltage and frequency.

公开(公告)号：US12119650B2

公开(公告)日：2024-10-15

申请号：US17923917

申请日：2022-09-01

Applicant: State Grid Hubei Electric Power Research Institute

Inventor： Defu Cai ,  Kunpeng Zhou ,  Zuowei Wang ,  Xiaohui Li ,  Li Wan ,  Haiguang Liu ,  Rusi Chen ,  Wenna Wang ,  Tao Wang ,  Liangyi Zhang ,  Guanqun Sun ,  Erxi Wang

IPC: H02J3/16 ,  H02J3/24 ,  H02J3/28

CPC classification number: H02J3/28 ,  H02J3/16 ,  H02J3/241 ,  H02J2203/10 ,  H02J2203/20

Abstract: Disclosed is an optimal power flow-based hierarchical control method for a distributed energy storage system (ESS), where the method divides control of an energy storage cluster into three layers, performs primary and secondary control to realize intra-cluster control, and performs tertiary control to realize inter-cluster control. In the primary control, droop coefficients are set to realize intra-cluster basic power distribution. In the secondary control, a frequency/voltage shift and uneven power distribution that are caused by a droop are compensated for based on a consistency algorithm. In the tertiary control, a central controller is set, a solution of an optimal power flow is calculated and delivered to each cluster as a control signal, and the control signal is tracked in real time through the secondary control and the primary control. The method adjusts a reference voltage of each energy storage cluster without requiring a common bus.

公开(公告)号：US12113358B2

公开(公告)日：2024-10-08

申请号：US18538514

申请日：2023-12-13

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Casper Hillerup Lyhne

IPC: H02J3/00 ,  H02J3/24 ,  H02J3/32 ,  H02J3/38

CPC classification number: H02J3/00 ,  H02J3/001 ,  H02J3/241 ,  H02J3/32 ,  H02J3/38 ,  H02J3/381 ,  H02J2203/10 ,  H02J2300/28

Abstract: According to an aspect of the invention there is provided a method of controlling an energy storage system to provide a frequency regulation service for a power network, to which the energy storage system is connected. The energy storage system is controlled according to one or more regulations of the power network to counteract frequency deviations within a frequency contingency deadband of the power network to provide the frequency regulation service for a service period. The energy storage system is one of a plurality of energy storage systems connected to the power network, each energy storage system being operated to counteract the frequency deviations according to the one or more regulations of the power network.