电流品质优化的容错型三相四开关逆变器载波调制算法  

Carrier-based modulation algorithm of fault-tolerant three-phase four-switch inverter for better current performance

作　　者：朱翀[1] 曾志勇[1] 赵荣祥[1,2] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027 [2]国家电力电子应用技术工程研究中心,浙江杭州310027

出　　处：《电力自动化设备》2017年第5期40-47,共8页Electric Power Automation Equipment

基　　金：国家重点基础研究发展计划(973计划)项目(2013CB-035600)~~

摘　　要：在深入分析四开关逆变器运行原理的基础上,提出一种基于载波调制的三相四开关逆变器简化算法,无需扇区选择、三角函数运算等复杂计算过程,只需对参考电压进行简单的四则运算,即可获得四扇区统一的调制波表达式。采用所提出的调制策略,可对逆变器中性点电压波动进行补偿,有效抑制了输出电流畸变。同时,对2种不同零矢量合成方案进行比较,以电流纹波有效值作为评估标准,推导出其在时域中的解析表达形式,最终确定输出电流性能更优良的调制方式。实验结果验证了所提出的调制算法的正确性和有效性。The operational principle of three-phase based modulation algorithm is proposed for it,which four-switch inverter is analyzed and a simplified carrier- only performs simple arithmetic operations on reference voltage to achieve a unified modulation wave expression for four sections,without sector selection and trigonometric operations. It compensates the neutral-point voltage fluctuation of inverter to effectively suppress the distortion of its output current. With the effective ripple current as the assessment criterion, two approaches of zero-vector synthesis are compared,the time-domain analytical expression is deduced and the modulation approach with better output-current performance is determined. The correctness and feasibility of the proposed modulation algorithm are verified by the experimental results.

关 键 词：容错型四开关逆变器 载波调制 中性点电压波动补偿 电流纹波 零矢量合成 逆变器 

分 类 号：TM464[电气工程—电器]