三相电压型PWM整流器定频模型预测控制  

Model predictive control with fixed switching frequency for three-phase voltage source PWM rectifier

作　　者：王萌[1] 施艳艳[1] 沈明辉 

机构地区：[1]河南师范大学河南省光伏材料重点实验室,河南新乡453007 [2]新乡供电公司,河南新乡453000

出　　处：《电机与控制学报》2014年第3期46-53,共8页Electric Machines and Control

基　　金：国家自然科学基金(51207104);河南省教育厅科学技术研究重点项目(13B470083);河南师范大学博士科研启动基金(01026500122;01026500119);河南师范大学青年科学基金(2013QK04);河南省重点科技攻关项目(102102310041)

摘　　要：针对模型预测控制(model predictive control,MPC)采样频率较高、开关频率不确定等问题,提出了一种三相电压型脉宽调制整流器(voltage source PWM rectifier,VSR)定频模型预测控制(model predictive control with fixed switching frequency,FSF-MPC)。分析了三相VSR各电压矢量在六个扇区内对d、q轴电流瞬时变化的影响,基于电流预测模型,在固定时间间隔内以满足电流误差最小为原则计算各电压矢量作用时间。采用空间矢量调制原理获得功率器件的开关状态,实现模型预测控制的定频控制。1 kW样机的仿真与实验结果表明,与不定频模型预测控制相比,所提FSF-MPC控制算法开关频率恒定,且无需较高的采样频率,可有效降低纹波电流和电流失真,提高三相VSR系统的运行性能。To solve the problems of high sampling rate and uncertain switching frequency in model predictive control （MPC）, model predictive control with fixed switching frequency （FSF-MPC） for three-phase voltage source pulse width modulation rectifier（VSR） was presented. The effect of three-phase VSR voltage vector in the six sectors on instantaneous d-and q-axis current variation was analyzed. Based on current predictive model, operation time of voltage vector was computed at fixed intervals adhered to the principle of minimum current error. To obtain the switching state of power devices, space vector modulation was employed and model predictive control with fixed switching frequency was realized. The simulations and experiments were conducted on 1 kW prototype. The results show that the proposed FSF-MPC algorithm has fixed switching frequency and does not require high sampling rate compared with variable frequency model predictive control. It can be applied to reduce current harmonics and distortions in an effective way. The performance of three-phase VSR system has also been improved.

关 键 词：电压型PWM整流器 定频模型预测控制 采样频率 空间矢量调制 

分 类 号：TM46[电气工程—电器]