虚拟磁链定向的三相电压源型脉宽调制整流器模型预测直接功率控制  

A Study on the Virtual Flux-Based Model Predictive Direct Power Control for the Three-Phase Voltage Source Pulse Width Modulation Rectifier

作　　者：任海峰 刘述喜 苏新柱 王毅 REN Haifeng;LIU Shuxi;SU Xinzhu;WANG Yi(School of Electrical and Electronic Engineering of Chongqing University of Technology,Chongqing 400054,P.R.China;Chongqing Energy Internet Engineering Technology Research Center,Chongqing 400054,P.R.China)

机构地区：[1]重庆理工大学电气与电子工程学院,重庆400054 [2]重庆市能源互联网工程技术研究中心,重庆400054

出　　处：《重庆电力高等专科学校学报》2021年第2期1-5,共5页Journal of Chongqing Electric Power College

摘　　要：针对三相电压源型整流器的传统有限集模型预测直接功率控制(model predictive direct power control,MPDPC)的开关频率不恒定,使得网侧电流谐波畸变率较大这一问题,将空间矢量脉冲宽度调制(space vector pulse width modulation,SVPWM)与传统有限集MPDPC结合起来,使其开关频率固定,同时采用虚拟磁链(virtual flux,VF)定向省去了网侧电压传感器,节约了成本。该系统先由虚拟磁链计算出当前时刻的功率值,然后通过功率预测模型得到下一时刻的功率预测值,并将功率预测值与功率参考值代入价值函数进行比较,最后从7种备选电压矢量中选取使代价函数最小的电压矢量为最优电压矢量输入SVPWM模块。仿真结果表明,所提的脉冲宽度调制VF-MPDPC控制策略具有较好的系统性能,且相比于传统的有限集VF-MPDPC策略,该方法对整流器网侧电流谐波有更好的抑制效果。The predictive direct power control(MPDPC)of the traditional model with finite sets of the three-phase voltage source rectifier has variable switching frequencies,which results in the high harmonic distortion rate of the grid current.To solve this problem,the space vector pulse width modulation(SVPWM)can be combined with the traditional finite set MPDPC to fix the switching frequency.At the same time,virtual flux orientation is used to eliminate the voltage sensor on the grid side and reduce the cost.In this system,the power of the current moment is calculated from virtual flux.Then the power of the next moment is obtained by power prediction model,and the predicted power and the reference power are substituted into the value function for comparison.Finally,the optimal voltage vector which can minimize the cost function from seven alternative voltage vectors is input to SVPWM module.The simulation results show that the VF-MPDPC control strategy proposed in this paper has better system performance and suppressive effect on the harmonics of the grid current of the rectifier than the traditional VF-MPDPC control strategy with finite sets.

关 键 词：模型预测控制 虚拟磁链 PWM整流器 直接功率控制 空间矢量脉冲宽度调制 

分 类 号：TM461[电气工程—电器]