静止同步补偿器与双馈风电场的无功电压协调控制

摘要

基于变速恒频双馈电机的风电场通常按单位功率因数方式运行,而引入无功补偿单元补偿风电场无功需求,这将限制电网波动及故障期间双馈风电场的无功调节能力.针对该问题,提出一种双馈风电场与静止同步补偿器(STATCOM)间的无功电压协调控制器.依据执行依赖启发式动态规划(ADHDP)原理,设计包含执行网络和评价网络的ADHDP控制器.该控制器能够充分发挥STATCOM的无功发生能力,并在故障期间协调双馈风电场产生无功参与并网点电压调节,而在无故障期间保证风电场的单位功率因数运行；而且ADHDP控制器起到附加阻尼作用,有效抑制了故障恢复过程中的电压振荡.算例仿真结果验证了所提控制器的有效性.%Reactive power capacity of wind farm with doubly fed induction generator( DFIG) is limited under voltage fluctuation or grid fault in the fact that wind farm is usually operated in unity power factor using reactive power compensator to meet reactive power demand of wind farm. Aiming at the problem, a controller is proposed for the coordinated voltage and reactive power control between wind farm and static synchronous compensator ( STAT-COM). Action dependent heuristic dynamic programming is used to design the controller, which contains action network and critic network. The ADHDP controller not only fully utilizes the capacity of STATCOM, but also reduces the level of voltage sags during grid fault and keeps wind farm operate in constant power factor. The controller also acts as a supplementary damping controller, and therefore, improves voltage oscillation damping after grid faults. Simulation results verify the effectiveness of the proposed controller.