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Voltage regulation method, device and energy storage system for large-scale energy storage system

A voltage regulation and energy storage system technology, applied in the field of energy storage systems, can solve problems such as multi-machine oscillation, power angle disturbance, voltage offset, etc., and achieve the effects of reducing disturbance, soft adjustment process, and avoiding multi-machine oscillation

Active Publication Date: 2022-07-22
NR ELECTRIC CO LTD +2
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Problems solved by technology

[0003] Aiming at the voltage offset in the off-grid operation state of the energy storage system, the current technical means and existing problems are: 1) Directly intervene in the operating voltage of the energy storage converter
During the adjustment process of this method, the power angle disturbance is relatively large, which is likely to cause multi-machine oscillation
2) The energy storage converter performs secondary voltage regulation on the spot, and the devices are independent of each other. When multiple devices are connected in parallel, it is easy to cause multi-machine oscillation

Method used

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  • Voltage regulation method, device and energy storage system for large-scale energy storage system

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[0049] Example embodiments are described more fully below with reference to the accompanying drawings. Example embodiments, however, can be embodied in various forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated descriptions will be omitted.

[0050] Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical solutions of the present application may be practiced without one or mo...

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Abstract

The present application provides a voltage regulation method and device for a large-scale energy storage system. The method includes: acquiring the operating reactive power and operating state parameters of each energy storage converter in an off-grid energy storage system, and calculating total reactive power and the number of online operations; calculate the average reactive power according to the total reactive power and the number of online operations, and obtain a first adjustment command after low-pass filtering; collect the AC voltage of the energy storage system, The AC voltage obtains the system operating voltage, and after adjusting the difference between the system operating voltage and the set target voltage with a regulator, a second adjustment command is obtained; Add, respectively multiply the online operating state parameters and adjustment coefficients of each energy storage converter to obtain the corresponding reactive power command. Using the droop control characteristics, the voltage is indirectly adjusted through reactive power; the operation information is used as a component of the output command, and the adjustment process is softer.

Description

technical field [0001] The present application relates to the technical field of electrical engineering, and in particular to a voltage regulation method, device and energy storage system for a large-scale energy storage system. Background technique [0002] Energy storage is an important part and key supporting technology of smart grid, energy Internet, microgrid, and grid-connected renewable energy. Large-capacity energy storage systems are generally composed of multiple energy storage units in parallel. Each energy storage unit is equipped with batteries, energy storage converters and other equipment. Among them, the energy storage converter usually operates as a voltage source, establishing and maintaining the voltage and frequency of the system. In the off-grid operation state of the energy storage system, when multiple energy storage converters operate in parallel in droop control or virtual synchronous generator mode, they all follow the droop relationship between r...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/40H02J3/16H02J3/24H02J3/50
CPCH02J3/40H02J3/16H02J3/24H02J3/50Y02E40/30
Inventor 李旭华新强丁勇刘为群张兴蒋顺平石祥建王景霄段梦珂
Owner NR ELECTRIC CO LTD
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