双馈风力发电中的恒电压无功控制策略研究

Research on constant-voltage reactive power control strategy in double-fed wind power generation

在常规双馈风电变流器矢量控制基础上,通过增加恒电压无功控制算法,提出一种双馈风电变流器恒电压无功控制策略,即采用PI调节器对电网正序电压进行闭环调节,调节器输出作为变流器无功功率指令输入,无功功率控制不再响应风机主控制器的指令。以1.5 MW双馈风电机组为例进行了仿真模型和实际测试验证,结果表明,该策略在一定程度上能够达到稳定系统电压的目的。

On the basis of conventional vector control in double-fed wind power converter, this paper proposes the constant-voltage reactive power control strategy for double-fed wind power converter by using voltage reactive power control, a strategy which makes closed loop regulation on network positive sequence voltage with PI regulator, the output of which as the input of converter reactive power instruction which responses the instruction of wind turbine main controller. Taking a 1.5 MW DFIG as an example, it is proved by simulation model and practical test that this strategy, to some extent, succeeds in stabilizing system voltage.