双馈风机无功出力极限及控制研究

Research on Reactive Power Transfer Limits and Control of DFIG

通过同时考虑双馈电机定子和网侧变流器处理无功功率的能力,求出双馈风机在其允许情况下吸收、发出无功功率的极限。有效地防止无功出力越限而引起跳机等事故。探讨了风电场分配无功补偿的方式,并根据系统不同运行状态下提出了一种新的无功控制策略。使定子和网侧变流器相互配合,达到充分发挥双馈风机参与电网无功调节的能力,起到调节电网电压和稳定电网的作用。构建了含双馈风机的电网系统,验证了该种控制策略的可行性。

By simultaneously considering the DFIG stator and the grid-side converter processing reactive power capacity,the reactive power limits,a reactive power limit is calculated.The reactive power out the limit caused by tripping accidents is effectively prevented.Discuss on the wind electric field distribution of reactive power compensation way,and according to the different system operation conditions a new reactive power control strategy is presented.The stator and the grid-side converter cooperate each other,to make the best of DFIG to participate in power grid reactive power regulation ability.Adjust voltage and stability of power grid effect are rised.Constructing a model that contained DGIF power system,verify the feasibility of the control strategy.