三相整流器改进的模型预测直接功率控制

Improved model predictive direct power control for three phase rectifier

针对传统的三相电压型整流器(VSR)直接功率控制的控制滞后和开关频率不固定的缺陷,在此基础上将模型预测控制(MPC)与直接功率控制(DPC)相结合,利用功率预测模型和最小误差原则推出输出电压矢量对空间矢量脉宽调制进行控制,针对传统三相整流器模型预测控制静态误差跟踪不精确的问题,将内模控制加入三相整流器模型预测直接功率控制进行改进,减小有功和无功功率误差同时也减小交流侧电流谐波,最后在Matlab/simulink中搭建模型对传统MPC-DPC与改进的MPC-DPC进行比较,证明了所提控制策略的可行和有效。

The traditional three-phase voltage rectifier direct power control has the problems of the control lag and the switching frequency unfixed.On this basis,the model predictive control(MPC)is combined with the direct power control(DPC),and the output voltage vector is used to control the space vector pulse width modulation(SVPWM)by using the power prediction model and the minimum error principle.In view of the static error of the traditional model predictive control,an optimization method is proposed that the internal model control is added to the model to predict the direct power control,to compensate the active power and the reactive power error and to reduce the AC side current harmonics.Finally,the modeling model is built in Matlab/simulink for the traditional MPC-DPC and the improved MPC-DPC.The comparison shows that the proposed control strategy is feasible and effective.