摘要
三相脉宽调制电流源型整流器在电网电压不平衡时,传统直接功率控制会导致功率脉动、直流侧输出低频波动和网侧电流畸变严重等问题,影响整流器性能。针对上述问题,提出一种无需采集网侧电流的改进型直接功率反馈控制策略,使得整流器在理想电网和不平衡电网下都能够获得良好性能。首先建立电流源型整流器在电网电压不平衡时的数学模型,推导出直流侧输出电流与网侧电流的关系表达式,然后在有功控制环中增加反馈控制直接抑制低频脉动,同时在调制环节中引入陷波器,以此减小网侧电流谐波。最后通过Matlab/Simulink仿真和试验样机测试,比较两种功率控制方案,验证了所提改进控制策略的正确性和优越性。
When the three-phase pulse width modulation current source rectifier operate under unbalanced grid voltage conditions,the traditional direct power control will cause power pulsation,low frequency output fluctuations on the DC side,and serious grid side current distortion,which will affect the performance of the rectifier.An improved power feedback control strategy that doesn’t need to collect grid side current is proposed,so that the rectifier can achieve good performance in both ideal and unbalanced grids.A mathematical model of the current source rectifier is firstly established when the grid voltage is unbalanced,and the expression of the relationship between the DC side output current and the grid side current is derived.Then feedback control is added in the active control loop to directly suppress low frequency pulsation,and at the same time a notch filter is introduced in the modulation link to reduce grid side current harmonics.Through Matlab/Simulink simulation and experimental prototype testing and comparing the two power control schemes,the correctness and superiority of the proposed method are verified.
作者
黄勇军
郭强
李山
程福泉
HUANG Yongjun;GUO Qiang;LI Shan;CHENG Fuquan(Chongqing Energy Internet Engineering Technology Research Center,Chongqing University of Technology,Chongqing 400054)
出处
《电气工程学报》
CSCD
2023年第3期184-195,共12页
Journal of Electrical Engineering
基金
重庆市教委科学技术研究计划资助项目(KJQN202001128,KJZDK201901102)。
关键词
电网不平衡
功率控制
陷波器
反馈控制
网侧电流传感器
Unbalanced grid voltage
power control
notch filter
feedback control
grid side current sensor
