电网不平衡时PWM整流器正负序分量计算方法  

Calculation Algorithm of Positive and Negative Sequence Components Under Unbalanced Grid Voltage

作　　者：郑征[1] 张子伟[1] 张振华 

机构地区：[1]河南理工大学,电气工程与自动化学院,河南焦作454000 [2]青岛天信变频电机有限公司,山东青岛266400

出　　处：《电力电子技术》2014年第5期68-70,73,共4页Power Electronics

基　　金：国家自然科学基金(61340015);河南理工大学博士基金(B2012-108)~~

摘　　要：分析了现有的电网不平衡条件下PWM电压型整流器(VSR)系统中正负序分量的计算方法,针对其所存在计算量大,控制较为复杂等问题,提出了一种基于静止坐标系的正负序分量计算方法,即T/4(T为基波周期)延迟法,并将这种方法成功地应用到电网不平衡时的三相VSR控制系统中。仿真与实验结果表明,T/4延迟法计算速度快,较其他方法能有效抑制直流母线电压波动和交流侧电流谐波,保证很高的功率因数和输入电流较好的正弦度,得到较为理想的直流母线电压,并能很好地满足控制系统的需求。The positive and negative components sequence calculation method of pulse width modulation（PWM） voltage source rectifier（VSR） control system has some disadvantages,such as mess calculation and complex control,a novel method based on stationary frame calculating the positive and negative sequence components,774 delaying method is proposed.It can solve computationally intensive and control more complex issues,and this method is successfully applied into the three-phase VSR control system unbalanced grid voltage.The results of simulation and experiment show that the proposed 774 delaying method has advantages of fasting calculation,effectively suppressed the DC bus voltage ripple and AC side current harmonics.It can ensure the high power factor,obtain sinusoidal supply cur-rents and satisfactory the DC bus voltage and well meet the requirements of control system.

关 键 词：整流器 正负序分量 延迟法 

分 类 号：TM461[电气工程—电器]