双馈电机风电场无功功率分析及控制策略

提出一种双馈电机风力发电系统无功极限的计算方法，该方法以双馈电机风电系统的功率关系为基础，考虑了网侧变换器在其功率允许范围内的无功发生能力，系统动态无功极限为定子与网侧变换器的无功极限之和。对双馈电机风电场在强电网无功调节中的应用进行了探讨，提出双馈电机风电场对当地用户进行就近无功补偿的策略，并给出相应的无功分配策略，包括风电场各风机之间以及单台风电机组定子和网侧变换器之间的无功分配原则。双馈电机风电场在实现变速恒频优化运行的同时，充分发挥了风电机组和整个风电场的无功处理能力，使其参与所连电网的无功调节。

Reactive Power Analysis and Control of Doubly Fed Induction Generator Wind Farm

A method is proposed to calculate the reactive power limit of DFIG(doubly fed induction generator) wind power generation system based on the power relationships of overall system.Considering the reactive power capacity of the grid side converter,total reactive power includes reactive power of stator and the converter.Reactive power regulation application of DFIG wind farm in the grid has been studied.A reactive power compensation strategy for the local user using DFIG wind farm has been developed.And the distribution algorithms of reactive power demand are given which includes that for distribution among DFIG wind power systems in the farm and that for distribution between stator and the grid side converter in one generation unit.With VSCF(variable speed and constant frequency) optimum operation of each generation unit,DFIG wind farm contributes to the reactive power regulation in the grid at its full reactive power capacity.