【摘要】 针对永磁直驱风力发电机组的低电压穿越运行问题,对传统的控制策略进行改进,分析风力发电机输出功率与转子电角速度的关系曲线,在电网故障期间,通过改变转子电角速度的给定值来改变发电机的转速,实现对发电机输出有功功率的控制,使得机侧与网侧的功率平衡。经仿真表明,所改进的控制策略能够快速稳定直流母线电压,能够抑制电网电压恢复时对变流器的二次冲击,实现风电机组低电压穿越运行。更多还原

【Abstract】 Aiming at the problem of low voltage ride through of permanent magnet direct-drive wind power generation system, this paper putsforward to improve the traditional control strategies, analyzes the relationship curve between wind turbine output power and power rotor angular velocity. During a grid failure, by changing electrical angular velocity setpoint to change the rotational speed of the generator rotor, the control of the generator active power output is achived, and enable the power balance between the machine side and the grid side. The simulation shows that, the improved control strategy can stable the DC bus voltage quickly, inhibit the secondary impacts on the converters during the grid voltage recovery, achieve lowvoltage ride through operation of wind turbines.更多还原