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双馈风力发电机在电网电压不对称骤升下无功功率优化控制

DOI: 10.13334/j.0258-8013.pcsee.2015.13.003, PP. 3211-3220

Keywords: 双馈风力发电机,转子侧变流器,无功功率,不对称骤升,电压支撑

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Abstract:

电网电压不对称骤升时如果仅向电网注入正序感性无功功率,当电网阻抗较大时,会造成没有发生骤升的机端相电压降低,加剧发电机机端电压的不对称度,同时增加定子侧无功功率脉动,因此需要通过定子侧注入相应的负序无功功率进行调节。为了优化电网电压不对称骤升时无功功率的控制策略,首先推导电网电压不对称骤升下双馈风力发电机的数学模型,然后分析转子侧变流器正负序无功电流的分配问题,讨论定子侧正负序无功功率对并网点电网电压支撑、发电机机端电压不对称度和定子侧无功功率脉动的耦合影响变化规律。基于以上分析,为实现电网电压不对称骤升时的复合控制目标,采用一种柔性的的正负序电压闭环的无功功率优化控制策略,最后通过仿真和实验结果验证了该控制策略的有效性和可行性。

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