鼠笼式感应电机风力发电系统新型控制策略

New Control Strategy for Wind Power Generation System Using Squirrel-Cage Induction Generator

提出了变速恒频风力发电系统一种新的控制方案,用鼠笼式感应电机作发电机,采用双PWM变流器将发电机和电网连接起来。鼠笼式感应电机侧变流器采用直接转矩控制来调节电机转速以满足风力机最大功率点跟踪时的转速响应,并把吸收的能量向电网侧传递;其网侧变换器采用电压电流双闭环控制,吸收电机侧传递过来的能量并传递到电网。仿真结果表明该控制策略能实现对鼠笼式感应电机风力发电系统电机转速、有功功率和无功功率的控制,说明了所提方案的可行性。

This paper proposes a new control scheme for the variable-speed constant-frequency wind power generation system, which uses squirrel-cage induction generator and connects the generator to power grid with a double PWM converter. The generator side converter adopts direct torque control strategy to adjust the generator rotational speed in order to respond to the wind turbine＇s maximum power point tracking, and to transfer the wind power from wind tur- bine to grid side converter. The grid side converter uses voltage-current double close-loop control to transfer the ener- gy absorbed from the generator side to power grid. Simulation results show that this proposed control strategy can con- trol the generator in its rotational speed and the active and reactive power, verified as a valid and feasible scheme.