PWM整流器无电流传感器前馈控制策略的研究

Study of the Feed-forward Control Strategy without the Current Sensor for PWM Rectifier

针对PWM整流器采用前馈控制策略加装负载电流传感器所产生的问题,提出了一种无电流传感器的前馈控制策略,即采用基于现今值状态观测器的方法取代电流传感器对负载电流进行测量,避免了安装电流传感器所带的增加线路电感、安装位置困难等问题,尤其当母线挂接多个逆变器负载需要多个传感器时,采用该方法可大大降低成本,提高系统的可靠性。最后,仿真和实验结果证实了无电流传感器前馈控制策略的正确性。

Due to the problem of setting a load current sensor using the feed forward control strategy for PWM rectifier, this paper presents a new feed-forward control strategy without the current sensor, i.e. applying a measurement method based on the present value state observer to replace the current sensor, which a voids many problems such as increased line inductance and the difficulty of fixing position. Especially, when the DC bus connects many inverter loads, it can reduce cost greatly and improve the system stability by using the presented observer. Eventually, the feed forward control strategy without the load current sensor is veri lied by both simulated result and experimental result.