三相电压型PWM整流器直接功率控制策略研究

Research on the Direct Power Control Strategy of Three Phase Type PWM Rectifier

针对传统电压定向型直接功率控制(VO-DPC)系统关频率不固定、控制滞后等问题提出了一种基于模型预测的直接功率控制(MP-DPC)策略.这种控制策略使用模型预测控制器来代替滞环比较器,提高了系统响应.这种控制策略还与空间矢量调制技术(Space Vector Pulse Modulation,SVPWM)结合使用,以电源电压的平均电压矢量作为整个控制过程的基矢量,进行电压空间矢量调制控制.同时,这种方法使DPC系统的结构更加简单,降低了设计难度.最后通过仿真实验进行对比分析,验证本文所提方法的可行性和有效性.

A Model Predictive Direct Power Control（MP-DPC） strategy is proposed for traditional Voltage Oriented Direct Power Control（VO-DPC） system with problems like unstable switch frequency and control delay.This strategy uses model predicative controller to take the place of power lag loop comparator to enhance the speed of control system.Meanwhile,the control strategy is integrated with Space Vector Pulse Modulation（SVPWM） to modulate and control voltage space vector with the average voltage vector as the basic vector of the whole control process,which simplifies the structure of DPC system and lowers the difficulty of design.In the end,Compare the simulation results with the traditional test results,it shows that the proposed method used in the simulation is feasible and the analysis results is effective.