基于SVG的双馈风电场电压稳定控制策略研究

双馈异步发电机(DFIG)在大规模风电并网环境下提供的无功功率无法满足并网需求。虽然引入固定电容器能够提供无功补偿,但系统受功率耦合的影响无法有效实时维持电压稳定。提出了一种静止无功发生器(SVG)与DFIG协调补偿无功的控制策略,同时引入电力系统稳定器(PSS)抑制系统的低频振荡,充分利用DFIG风电机组自身发出无功的能力,减少了SVG的配置容量。在MATLAB/Simulink软件仿真平台建立DFIG风电机组并网模型,仿真结果证实了此控制策略能够完成连续无功补偿,有效维持并网点电压稳定,增强系统输电能力。

Research on Voltage Stability Control Strategy forDFIG Wind Farm with SVG

The reactive power compensation capability of doubly fed induction generator (DFIG) can not meet the demand of largescale wind power grid. Although the introduction of fixed capacitors could provide reactive power compensation, as the system was affected by the power coupling, it could not effectively maintain realtime voltage stability. A control strategy that static var generator (SVG) and DFIG coordinated compensation reactive power was proposed, and the power system stabilizer (PSS) was introduced to suppress the low frequency oscillation of the system, make full use of DFIG wind turbine capacity itself to send reactive power, the configuration capacity of SVG was reduced. The DFIG wind turbine model is established on the MATLAB/Simulink software simulation platform, the simulation results showed that the control strategy could complete the continuous reactive power compensation, effectively maintain the voltage stability and enhance the transmission capacity of the system.