变速恒频双馈风电机组控制模式对电网稳定影响及其对策

Influences of control modes of variable-speed and constant-frequency doubly-fed generators in wind farms on voltage stability of power gird and its solutions

以实际电网为例,分析以变速恒频双馈风电机组组成的风电场并网运行对系统电压稳定性的影响,并对风电机组不同控制模式下运行状态对系统电压稳定性水平的影响进行比较。仿真结果表明,采用恒电压控制的变速恒频双馈风电机组,因为能够控制机端电压,所以在维持风电场并网后的系统电压稳定方面较恒功率控制方式具有较大的优势。静止无功补偿器(SVC)可为系统提供快速动态无功功率支撑,采用恒功率控制方式的风电机组安装SVC设备后,可以明显提高电网电压的暂态水平。

According to the parameters from a real grid, the voltage stability of the grid affected by connected wind farms which are composed of variable-speed constant-frequent （VSCF） wind power generators was analyzed, and voltage stability levels in different control modes were compared. Simulation results show that VSCF control modes in constant-voltage has a great advantage over that in constant-frequent ones in maintaining voltage stability of the grid, because it is able to control the voltage of wind power generators. Besides, static var compensation （SVC） can rapidly provide a reactive power support, so wind power generators in constant-power control mode are equipped with SVC in order to raise the transient voltage level.