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风电场交直流混合输电并网中VSC-HVDC的控制

DOI: 10.13334/j.0258-8013.pcsee.2014.28.005, PP. 4781-4790

Keywords: 风力发电,交直流混合输电,电压源换流器,高压直流输电,控制策略,稳定性

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Abstract:

为提高风电场交直流混合输电并网的系统性能,提出一种更加灵活的电压源换流器高压直流(voltagesourceconverterbasedhighvoltagedirectcurrent,VSC-HVDC)控制策略。对于风电场侧电压源换流器,设计了一种新的交流电压-功角控制方法。对于交直流混合输电模式,该方法通过调节风电场交流母线电压与电压源换流器输出电压间的功角来实现定有功功率控制。对于纯柔性直流输电模式,风电场交流母线电压自动被调节为具有恒幅恒频的交流电压,实现了对波动风电的同步输送。该方法中输电模式的变化无需切换控制;另外,通过附加电流高通滤波器增强了对系统谐振的阻尼作用。对电网侧电压源换流器,采用一种新的直接电流矢量控制,使直流电压稳定在参考值上。运用PSCAD/EMTDC仿真软件对分别接入笼型感应发电机(squirrelcageinductiongenerator,SCIG)风电场和双馈感应发电机(doublyfedinductiongenerator,DFIG)风电场的交直流混合输电系统建模仿真。一系列运行条件下的仿真结果验证了控制方法的有效性与可行性。

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