三相电压型脉宽调制整流器定频模型预测控制

摘要

To solve the problem of high samphng rate and uncertain switching frequency in finite-control-set,odel predictive control (FCS-MPC) of three-phase voltage type pulse width modulation (PWM) rectifier,a kind of constant switching frequency method was proposed.The voltage of AC side of rectifier which would be effected in the next sampling period was obtained by solving cost function,then the voltage would be produced by using space vector pulse width modulation method to achieve constant switching frequency.Simulation and experimental results showed that the proposed control algorithm had constant switching frequency,low harmonic content and the rectifier operates with high power factor.%针对三相电压型脉宽调制(PWM)整流器有限控制集模型预测控制采样频率高、开关频率不固定的缺点,提出了一种定频模型预测控制方法.通过求解价值函数得到PWM整流器交流侧下一采样时刻所要输出的电压值,利用空间矢量脉宽调制技术输出计算得到的电压值,实现定频模型预测控制.仿真与试验结果表明:所提出的控制算法开关频率恒定,稳态电流谐波含量低,实现了整流器高功率因数运行.