Fast balance control method and device of multiple battery stacks of energy storage power station

A technology of energy storage power station and balance control, which is applied in the direction of battery circuit devices, circuit devices, charge balance circuits, etc., and can solve the problems of high cost of battery systems and obstacles to the application of power systems

Active Publication Date: 2019-11-26
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the high cost of battery systems hindered their application in power systems

Method used

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  • Fast balance control method and device of multiple battery stacks of energy storage power station
  • Fast balance control method and device of multiple battery stacks of energy storage power station
  • Fast balance control method and device of multiple battery stacks of energy storage power station

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Experimental program
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Effect test

Embodiment 1

[0081] This embodiment provides a fast balancing control method for multi-battery stacks in an energy storage power station.

[0082] A typical energy storage power station such as figure 1 As shown, it is composed of power electronic converter, battery system, control and protection system and other parts. Due to the large capacity of the battery system, it is divided into several battery stacks. Each battery stack is equipped with a power electronic converter to realize AC-DC conversion and grid-connected power control. The control and protection system realizes the interaction and protection between the energy storage power station and the power grid, and is also the place where the control method of the present invention is realized. The flow of the control method is as follows: figure 2 shown.

[0083] The energy storage power station control system collects SoC data of all running battery stacks through communication equipment, and records the maximum value as SoC m...

Embodiment 2

[0123] This embodiment provides a multi-battery stack fast balancing control device for an energy storage power station, which includes a battery stack data acquisition unit, a maximum deviation calculation unit for each battery stack state of charge, a state of charge and discharge depth update unit, and an active power command in sequence Units are given proportionally.

[0124] Battery stack data acquisition unit: collect all running battery stack SoC data through communication equipment, and record the maximum value as SoC max , the minimum value is SoC min ;

[0125] The maximum deviation calculation unit of each battery stack state of charge: calculate SoC max with SoC min If the difference is greater than or equal to a threshold tv, the state of charge and depth of discharge will be updated; if it is less than the threshold, the state of charge and depth of discharge will not be updated;

[0126] State of charge and depth of discharge update unit: divide the state o...

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Abstract

The invention discloses a fast balance control method and device of multiple battery stacks of an energy storage power station. As the capacity of the energy storage power station becomes larger, thenumber of battery stacks contained in the energy storage power station is also increased synchronously; therefore, it is necessary to consider not only the balance of SoC between battery cells, but also the balance of the SoC between the battery stacks. The control method adopted by the invention is as follows: dividing states of charge of the battery stacks into several areas, and updating different states of charge and discharge depths in different areas; sequentially giving active power instructions of the battery stacks in proportions according to the updated states of charge and the discharge depths; and meanwhile, setting an updating threshold of the states of charge and the discharge depths to avoid the frequent switching of energy storage power. By adopting the fast balance control method and device disclosed by the invention, the balance speed of the states of charge of the multiple battery stacks of the energy storage power station can be effectively improved, the operationcondition of the energy storage power station is improved, and the available rate of the energy storage power station is improved; and meanwhile, the switching of the energy storage power is reduced as much as possible, and the operation stability of the energy storage power station and the friendliness with a power grid are improved.

Description

technical field [0001] The invention belongs to the field of energy storage control, and relates to the control of an energy storage power station, in particular to a method and device for quickly balancing multiple battery stacks in an energy storage power station. Background technique [0002] The large-scale access of renewable energy to the power grid brings huge challenges to the operation of the power grid. The power grid needs to configure a large number of flexible resources to hedge against the randomness of renewable energy. Usually, these flexible resources include frequency regulation and peak regulation capabilities of traditional generating units, pumped storage power plants, etc. Compared with conventional generator sets, the energy storage device using the power electronic converter as the grid interface has the ability to output full power in milliseconds, with fast response speed and high adjustment accuracy, which can effectively improve the flexibility of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02J3/32
CPCH02J3/32H02J7/0014
Inventor 章雷其赵波张雪松徐珂倪筹帷汪湘晋李志浩唐雅洁冯怿彬林达
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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