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Power grid black-start method and system based on energy storage system

A black start and power grid technology, which is applied to electrical components, circuit devices, AC network circuits, etc., can solve the problems of low reliability of communication lines and cumbersome synchronization communication process, and achieve the goal of shortening the black start time and reducing the waiting time for synchronization confirmation Effect

Active Publication Date: 2020-05-08
SUNGROW POWER SUPPLY CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current grid black start control method based on the energy storage system requires a synchronization waiting time when the energy storage converters are connected in parallel, and the synchronization communication process is cumbersome, or the reliability of communication lines needs to be set between devices.

Method used

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  • Power grid black-start method and system based on energy storage system
  • Power grid black-start method and system based on energy storage system
  • Power grid black-start method and system based on energy storage system

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Embodiment Construction

[0038] Firstly, the basic concept of the energy storage converter is introduced. The Power Conversion System (PCS) can control the charging and discharging process of the battery, perform AC-DC conversion, and can directly supply power to AC loads in the absence of a grid. . PCS is composed of DC / AC bidirectional converter, control unit and so on. The PCS controller receives the background control command through communication, and controls the PCS to charge or discharge the battery according to the sign and size of the power command, so as to realize the adjustment of the active power and reactive power of the grid.

[0039] In the traditional grid black start control scheme based on the energy storage system, the energy storage converters participating in the black start are relatively independent after starting, and the master controller controls the output voltage of one energy storage converter to obtain a synchronous voltage, and then waits for all Other energy storage ...

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Abstract

The invention provides a power grid black-start method and system based on an energy storage system. When energy storage converters are started, the energy storage converters are directly controlled to be connected in parallel, the main energy storage converter builds a voltage, the auxiliary energy storage converter monitors the voltage state of an alternating current port, and when the voltage of the alternating current port meets the networking condition, the energy storage converters are connected in parallel for networking output. The process does not need repeated synchronous confirmation of the controller and each energy storage converter. Moreover, after the energy storage converters are connected in parallel and networked, the energy storage converters do not need to be divided into a master machine and a slave machine, the alternating-current output voltage of the energy storage converters is jointly increased, and repeated synchronous confirmation of the controller and the energy storage converters is not needed in the process. Therefore, according to the scheme, the synchronous confirmation waiting time in the whole black-start process is shortened, and the black-starttime is shortened. Meanwhile, the rising gradient can be adjusted, that is, the voltage rising gradient can be set, so the synchronous starting time can be set according to actual requirements.

Description

technical field [0001] The invention belongs to the technical field of power generation, and in particular relates to an energy storage system-based power grid black start method and system. Background technique [0002] When the power plant is decoupled from the power grid and shut down, the entire power plant will be in a state of no electricity. The process of the main generator set of the power plant from no power to the unit restarting to connect to the grid or to establish a grid-connected voltage is called a black start. [0003] When the power plant is equipped with an energy storage system, the AC output voltage can be established through the energy storage system to provide the excitation required by the main step-up transformer of the generator set, as well as the power requirements such as its starting unit, and finally complete the grid-connected power generation of the main generator set Black boot. However, the current grid black start control method based on...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/38H02M1/36
CPCH02J3/00H02J3/38H02M1/36
Inventor 陈方林程林潘涛潘年安曹晓辉
Owner SUNGROW POWER SUPPLY CO LTD
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