灰色预测和重复控制的三相电压源整流器研究

Investigation on Three-phase Voltage Source Rectifier Using Grey Prediction and Repetitive Control

随着变频空调行业的发展,需要采用三相交流电压供电的AC/DC变换器,三相电压源整流器(VSR)是一种重要的候选电路。在传统的VSR控制算法中,一般采用在当前开关周期中利用上一开关周期或当前开关周期测量的电量计算相关数据,用于下一个开关周期中驱动脉冲生成,这将不可避免地产生控制滞后现象。故此处采用GM(1,1)模型设计一种灰色预测,以准确预测下一开关周期中所需电量。包括输入交流电压、输出直流电压和升压电感电流,由此实现精确控制。采用传统的电压外环、电流内环的双环控制策略不能完全消除静差,为此可实施重复控制,以削弱静差并改善动态特性。在简述三相VSR工作原理的基础上,设计了基于灰色预测和重复控制的三相VSR复合控制策略,并进行了实验研究,所得结果验证了所提方案的正确性。

As the variable frequency air-conditioner industry develops increasingly, the AC/DC converters powered by three-phase AC mains.And the traditional three-phase voltage source rectifier（VSR） is an important candidate converter.In terms of the traditional control algorithms of VSR,in any current switching cycle,electric quantity should be calculated by using the acquired original data.These original data is detected in the current switching cycle as well as the previous switching cycle.These original data is used to generate the needed driving pulses which will be sent to drive the power switches in the next switching cycle.Obviously,the control delay occurs inevitably.Therefore, a gray prediction using GM （1,1） model is designed which can accurately predict the required electrical quantities in the next switching cycle,including the input AC voltage,the output DC voltage and the Boost inductor current.Thus repetitive control of VSR can be implemented which can reduce the static error and improve the dynamic characteristics.After the analysis of the operation principle of the three-phase VSR,a novel three-phase VSR comprehensive con- trol strategy is presented based on grey prediction and repetitive control.Experimental studies are conducted ,and the experimental results prove the correctness of control strategy.