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注入无功功率的链式电池储能系统荷电状态均衡控制策略
作者:
作者单位:

1.电力系统及发电设备控制和仿真国家重点实验室,清华大学,北京市 100084;2.国网北京市电力公司,北京市 100031

作者简介:

通讯作者:

基金项目:

国家电网公司总部科技项目(5202011600UH)。


Balancing Control Strategy of State of Charge for Cascaded Battery Energy Storage System with Injection of Reactive Power
Author:
Affiliation:

1.State Key Laboratory of Control and Simulation of Power System and Generation Equipments, Tsinghua University, Beijing 100084, China;2.State Grid Beijing Electric Power Company, Beijing 100031, China

Fund Project:

This work is supported by State Grid Corporation of China (No. 5202011600UH).

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    摘要:

    针对链式电池储能系统相内电池组荷电状态(SOC)不均衡问题,分析了单位功率因数下均衡控制策略在SOC极度不均衡时导致过调制的边界条件,并提出了一种注入无功功率的新型相内SOC均衡控制策略。通过在各H桥调制信号中叠加有功和无功电压分量,重新分配有功和无功功率,保证SOC处于极端状态的电池组主要进行有功功率交换,其余电池组主要进行无功功率交换,实现极端模块调制比有效降低,非极端模块调制比略有增长,避免过调制。与单位功率因数均衡控制策略相比,该策略通过控制功率因数角充分协调各模块调制比,可以在各电池组SOC差异更大的情况下实现均衡控制,扩大适用范围。仿真结果验证了所提策略的正确性和有效性。

    Abstract:

    To address the issue of state of charge (SOC) unbalance in cascaded battery energy storage system, this paper analyzes the boundary conditions of over-modulation with unity power factor for balancing control strategy when SOC is extremely imbalanced and proposes a novel balancing control strategy of SOC in phase with injection of reactive power. By superimposing the active and reactive voltage components to each H-bridge modulation signal and redistributing active power and reactive power, this strategy can ensure that the batteries with extreme SOC mainly exchange active power, while other batteries mainly exchange reactive power. Therefore, it can effectively reduce the modulation ratio of the batteries with extreme SOC, while slightly increase the modulation ratio of other batteries, and avoid over-modulation. Compared with the balancing control strategy with unity power factor, this strategy can fully coordinate the modulation ratio of each module by controlling the power factor angle and expand application scope of balancing control with bigger difference between SOC of each battery. The simulation results verify the correctness and effectiveness of the proposed control strategy.

    表 3 Table 3
    表 2 Table 2
    图1 注入无功功率的相内SOC均衡控制Fig.1 Balancing control of SOC in phase with injection of reactive power
    图2 注入无功功率的链式电池储能系统整体控制策略Fig.2 Overall control strategy of cascaded battery energy storage system with injection of reactive power
    图3 充电过程单位功率因数SOC均衡控制失效仿真波形Fig.3 Simulation waveforms of balancing control failure for SOC in operation with unity power factor during charging process
    图4 充电过程中注入无功功率的SOC均衡控制仿真波形Fig.4 Simulation waveforms of balancing control for SOC with reactive power injection during charging process
    图 链式电池储能系统主电路结构Fig. Main circuit of cascaded H-bridge battery energy storage system
    图 单位功率因数下的相内SOC均衡控制相量图Fig. Phasor diagram of SOC balancing control in phase with unit power factor
    图 注入无功功率分析Fig. Analysis of injection of reactive power
    图 注入无功功率的相内SOC均衡控制相量图Fig. Phasor diagram of SOC balancing control with injection of reactive power
    图 放电过程单位功率因数SOC均衡控制Fig. Simulation waveforms under power factor operation during discharge
    图 放电过程注入无功功率的SOC 均衡控制Fig. Simulation waveforms under individual balancing control of reactive compensation during discharge
    表 1 注入无功功率前后临界均衡状态模块调制比对比Table 1 Modulation ratio comparison of modules with critical equilibrium states before and after injection of reactive power
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引用本文

陈舒钰,刘文华,赵香花,等.注入无功功率的链式电池储能系统荷电状态均衡控制策略[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20190823004.
CHEN Shuyu,LIU Wenhua,ZHAO Xianghua,et al.Balancing Control Strategy of State of Charge for Cascaded Battery Energy Storage System with Injection of Reactive Power[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190823004.

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  • 收稿日期:2019-08-23
  • 最后修改日期:2020-02-25
  • 录用日期:2019-12-27
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