基于鲁棒系数的逆变器开关角选择方法

THE METHODS ABOUT SELECTING SWITCH ANGLE OF INVERTER BASED ON ROBUST COEFFICENT

在逆变器的选择谐波消除技术中,理想的开关角在实现过程中会引入误差。该文在分析开关角误差特点及危害的基础上,提出了基于鲁棒系数选择开关角的方法,当开关角鲁棒系数越小,则相同的误差对特定谐波成分的影响越小;针对多组开关角或需要消除多次谐波的情形,还提出了相应的综合鲁棒系数.实例表明所提出的方法较好地提高了逆变器谐波消除的鲁棒性。

Realizing ideal switch angle would cause switch angle error in the selective harmonic elimination technique of inverter. This paper proposes a method about selecting switch angle based on robust coefficient on the basis of analysis caracteristic and harm of switch angle error. The smaller robust coefficient of switch angle is, the less affection the same error would being to selected harmonic. To counter more groups of switch angle or elimination of more harmonic,this paper proposes the corresponding integrated robust coefficient. The examples show the methods proposed effectively increases robustness of elimination harmonic of inverter..