电网电压不平衡下PMSG风电场可控运行区域研究

摘要

针对电网电压不平衡下永磁直驱风电场实现其并网有功功率无波动、并网无功功率无波动以及平衡并网电流3个传统控制目标,推导了永磁直驱风电场中网侧变换器输出负序电流能力以及为实现各控制目标所需的负序电流幅值,通过将二者结合,进而得到了基于不同电网电压不平衡度和系统有功出力的永磁直驱风电场实现各传统控制目标的可控运行区域,并利用仿真和实验对其进行验证,为实际永磁直驱风电系统在电网电压不平衡下控制策略的合理选取提供理论依据.%For achieving traditional control targets of wind farm based on PMSG(Permanent-Magnet Synchronous Generator) in unbalanced grid-voltage condition,i.e.balanced grid-connecting current without active and reactive power fluctuations,the negative-sequence current output capability of its grid-side converter and the required amplitude of negative-sequence current for each control target are deduced.Furthermore,its controllable operating regions for different grid-voltage imbalance degrees and different system active power outputs are obtained and verified by simulation and experiment,which provides the theoretical basis for the reasonable selection of control scheme for the PMSG-based wind farm in unbalanced grid-voltage condition.