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海上风电串联多端VSC-HVDC协调控制策略

, PP. 42-48

Keywords: 海上风电,串联多端VSC-HVDC并网,最大功率追踪

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Abstract:

根据直驱风机的结构特点,结合VSC的控制特性,提出了以串联多端VSC-HVDC为基础的海上风电场并网电路拓扑。该拓扑结构将直驱风机结构简化,省去了直驱风机中全功率变流器的逆变侧,将整流侧串联相连形成串联多端VSC-HVDC结构,岸上网侧逆变器采用多电平VSC结构。该拓扑结构避免了传统高压直流传输中的多次电流变化,并通过串联升压省去了升压变压器,降低了系统复杂度,减小了系统传输损耗。此外,本文提出了针对该拓扑结构的控制策略,并模拟大规模风场进行仿真实验,仿真结果表明该电路拓扑能够稳定运行,控制策略能够实现风机单独最大功率跟踪和系统中各变流器的高效运行。

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