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电网技术  2015 

直流孤岛外送风电变电流控制策略

DOI: 10.13335/j.1000-3673.pst.2015.09.009, PP. 2432-2437

Keywords: 风电传输,高压直流输电,弱送端系统,直流孤岛,变电流控制

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Abstract:

由于风电具有波动性,对于没有足够火电配比的风电系统,尤其是风电孤岛系统,无法采用以往的定功率控制输送风电。为此,提出可以跟踪风电变化、输送可控可变功率的变电流控制策略。根据风电功率的波动性,该策略利用变电流控制方式实时输送波动的风电功率,且可以保证系统的电压电流均在允许范围之内。推导了该策略的控制原理、运行区域,确定了控制模型结构,设计了变电流控制器,搭建了仿真模型。仿真结果验证了所提策略的有效性。

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