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并联型储能系统孤网运行协调控制策略

, PP. 128-134

Keywords: 并联型储能系统,负荷分配,电压幅值及频率控制,荷电状态

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Abstract:

储能系统为含波动性可再生能源、负荷扰动大的孤网系统实现系统稳定提供了一种有效的方法。通过多个子储能系统的并联可提高储能系统的容量,即并联型储能系统。分析了并联型储能系统工作原理,根据电池系统工作特性并结合传统下垂控制,提出了基于电池荷电状态的负荷分配控制策略,即外环功率协调控制。同时,考虑到下垂控制存在固有静态误差、中低压电网线路阻抗不完全为纯感性等因素,提出了含线性补偿环的电压幅值-频率控制策略,即内环电压控制。仿真和实验结果表明,在不同带载情况下,该系统不仅能维持系统电压幅值和频率稳定、且能有效地分配负荷功率,进而提高电池均衡管理能力。

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