风电场并网多无功源协同电压控制策略仿真

A three-Stage Coordinated Voltage Control Strategy with Multiple Reactive Power Sources for Wind Farms Containing DFIGs

为解决风电场并网点电压波动问题,减少动态无功设备的投资成本,在研究双馈风机的稳定运行约束条件和控制方法的基础上,提出一种协调双馈风机、静止无功发生器与电容器组的三阶段电压控制策略。第一阶段充分利用双馈风机自身的无功输出能力实现无功就地平衡。第二阶段考虑各无功源的响应能力和响应速度,控制静止无功发生器、电容器组与双馈风机协调响应无功需求。第三阶段利用电容器组的基础无功置换静止无功发生器的动态无功,以应对下一次扰动。基于DIgSILENT平台搭建风电场并网模型,仿真结果表明,所提策略在维持并网点电压稳定的同时,能够提高风电场的动态无功储备,降低动态无功设备投资成本,提高风机利用效率。

To improve the voltage stability of the point of common coupling and to reduce the investment cost of dynamic reactive power equipment in the wind power integrated system,the stable operating constraints and control principles of DFIG were studied.Furthermore,a three-stage reactive voltage regulation strategy for coordinated con-trol of DFIGs,capacitor banks and SVG was proposed in this paper.In the first stage,DFIGs’reactive power was fully utilized to achieve reactive power demand local consumption.In the second stage,SVG and capacitor banks were dispatched to cooperate with DFIGs considering reactive power ability and response speed of the reactive power equipment.In the third stage,the basic reactive power of capacitor banks was used to replace the dynamic reactive power of SVG,so that the dynamic reactive power reserve was improved to cope with the next disturbance.Based on the DIgSILENT platform,the wind farm integration model was built.The feasibility of the strategy proposed was veri-fied by the simulation results of three-machine-and-nine-node example.