摘要
为了降低PWM整流器的硬件成本、提高系统可靠性,取消交流侧电压传感器是发展方向之一。无网压传感器的PWM整流器大多采用虚拟磁链观测网侧电压,其观测的准确性是实现PWM整流器高性能控制的关键。针对基于一阶低通滤波器的传统磁链观测器会产生相位偏移问题,提出了基于二阶低通滤波器的改进磁链观测方法,可以有效地消除磁链观测中的积分初始值和相位偏移问题,提高了磁链观测器的精度。其次,为了解决单相PWM整流器模型预测控制无法抑制网侧电流中的低次谐波问题,提出了一种多重谐波补偿的模型预测控制策略,降低了网侧电流中的低次谐波含量。实验结果表明,所提算法不仅能够有效地解决传统磁链观测器相位偏移的问题,而且能有效地抑制网侧电流的低次谐波,改善PWM整流器的电流质量。
In order to reduce the hardware cost of the pulse width modulation(PWM)rectifier and improve the system reliability,one option is to eliminate the AC side voltage sensor.The virtual flux linkage is mostly adopted in the control algorithm of PWM rectifier without line voltage sensors.Accurate observation of the grid side voltage flux is the key to the high performance control of PWM rectifier.Firstly,in view of the phase shift problem of the traditional flux observer based on the first-order low-pass filter,an improved flux linkage observation method based on the second-order low-pass filter is proposed.This method can effectively eliminate the integral initial value and phase offset in the flux observer,and improve the accuracy of the flux observer.Secondly,in order to solve the problem that model predictive control cannot suppress the low-order harmonics in the grid-side current of single-phase PWM rectifier,a model prediction control strategy based on multiple harmonic compensation is proposed.Finally,the experimental results show that the proposed algorithm effectively solves the problem of phase shift of traditional flux observer,suppresses the low-order harmonics of the grid-side current,and improves the current quality of the PWM rectifier.
作者
熊成林
宋智威
黄路
李辉
XIONG Cheng-lin;SONG Zhi-wei;HUANG Lu;LI Hui(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2020年第11期93-101,共9页
Electric Machines and Control
基金
国家重点研发计划(2017YFB1200801-05)
中央高校基本科研业务费专项资金(2682017CX045)。
关键词
单相PWM整流器
无网压传感器
改进磁链观测方法
低次谐波
谐波补偿
single phase PWM rectifier
without line voltage sensors
improved flux-linkage observation method
low-order harmonics
harmonic compensation
