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Energy storage device system for primary frequency modulation and automatic generation control (AGC) auxiliary regulation technology

An energy storage device and energy storage technology, which are applied in circuit devices, AC network circuits, and single-network parallel feeding arrangements, etc., can solve the problems that batteries are difficult to complete the charging and discharging cycle, cannot be maintained online, and have no redundant backup. , to improve the ability to deal with sudden failures, reduce thermal stress changes, and improve the effect of economy

Inactive Publication Date: 2017-05-31
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] image 3 Only one group of batteries is used in the battery, which has the following disadvantages: 1) It is difficult for the battery to complete the entire process of charging and discharging cycles, and it is impossible to complete the charging to the rated power and then release it to the best low power of the battery; 2) There is no redundant backup, so it cannot be On-line maintenance, the energy storage technology cannot be used in the event of a failure of the battery pack or DC-AC converter

Method used

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  • Energy storage device system for primary frequency modulation and automatic generation control (AGC) auxiliary regulation technology
  • Energy storage device system for primary frequency modulation and automatic generation control (AGC) auxiliary regulation technology
  • Energy storage device system for primary frequency modulation and automatic generation control (AGC) auxiliary regulation technology

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] Such as figure 1 It is a system diagram of the present invention, which adopts a composite energy storage multi-terminal access system, assists the primary frequency regulation and AGC of the unit through the load distribution system, and improves the response ability of the unit to the "two detailed rules".

[0031] figure 1 1, 2, and 3 are different energy storage devices to realize composite energy storage, and use the complementary characteristics between different energy storages to meet the primary frequency modulation and AGC response capabilities of the unit. Among them, 1 is the storage battery pack 1, 2 is the energy storage battery pack 2, and 3 is the supercapacitor.

[0032] 4 is a multi-port DC-DC converter, that is, a multi-port DC-DC converter. Its internal circuit is DC-AC, AC-DC, which realizes the access and energ...

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Abstract

An energy storage device system for a primary frequency modulation and automatic generation control (AGC) auxiliary regulation technology comprises a power generation set, a transformer, a power grid, a DC-AC converter and energy storage battery packs and is characterized in that a multi-port DC-DC converter is also arranged, so that connection ports of a plurality of energy storage battery packs are connected with respective port of the DC-DC converter, and at least one supercapacitor is also connected with the respective port of the DC-DC converter; and moreover, a load allocation system is used for receiving a dispatched AGC instruction or forming a load instruction according to a frequency of the power grid, the instruction is divided into two paths, one path passes through an energy management system to be connected with the multi-port DC-DC converter and the DC-AC converter, and the other path is connected with a distributed control system (DCS) and digital electric hydraulic (DEH) control system of the generation set to control the power generation set to work. Therefore, the peak load regulation capability of a power system can be improved, the primary frequency regulation ability and the AGC response capability of a coal-fired unit are improved, the stable running of a power plant is ensured, and energy is saved.

Description

technical field [0001] The present invention relates to electric energy storage and conversion technology, in particular to energy storage technology devices in power systems, which are used for peak load reduction, primary frequency regulation, AGC (automatic generation control) auxiliary regulation, improvement of power grid stability, improvement of power quality, improvement of The role of grid utilization. Background technique [0002] With the development of social and economic forms, the power structure of the power grid has also undergone certain changes: on the one hand, UHV input power has increased steadily, and at the same time, the peak-to-valley difference of the daily load curve of the power grid is increasing day by day, coupled with the adjustment of the domestic national economic structure. The utilization hours of some thermal power units will drop significantly. Therefore, the power grid puts forward new requirements for the generating set: 1) The genera...

Claims

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Application Information

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IPC IPC(8): H02J3/32H02J3/28H02J3/24H02J3/38
CPCH02J3/24H02J3/28H02J3/32H02J3/381
Inventor 沈晓群杨震力叶继英李莉莉
Owner ZHEJIANG OCEAN UNIV
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