双PWM变换器功率前馈控制方法

为解决双PWM变换器控制直流母线电压波动偏大和系统响应慢的问题,提出了一种功率前馈控制方法。在整流器侧有功电流的给定值中加入逆变器有功功率对应的补偿量,在电机运行状态发生改变时不会直接改变直流侧母线电容电压的大小,而是直接改变整流器侧有功电流的大小。仿真结果表明双PWM变换器功率前馈控制策略能有效减小直流母线的波动,使减小直流母线电容成为可能,同时也提高了系统的动态响应性能。

Feed-forward power control strategy for dual PWM converter

To solve the problems of power response delay and DC-bus voltage fluctuations for dual PWM converter,a feed-forward power control strategy is presented.The corresponding active power compensations current of inverter are added in the active current reference,the active current of rectifier instead of the dc-bus voltage is directly changed when the motor running status changed.Simulation results show that the DC-bus voltage fluctuations are minimized,which can reduced the capacitors size,and the dynamic performance of the system is improved.