中国电机工程学报2016，Vol.36Issue(15)：4203-4213,11.DOI:10.13334/j.0258-8013.pcsee.151767
容错型三相并网变换器线性调制函数分析
Analysis of the Linear Modulation Index Function for Fault-tolerant Grid-connected Three-phase PWM Converter
摘要
Abstract
The essential difference among the various space vector modulation (SVM) approaches is investigated. Using the geometric similarity principle, the time allocated for the zero voltage vectors is obtained. The dynamic equation of the capacitor voltage is derived, and the equation indicates that the capacitor voltage imbalance composed of capacitor voltage oscillation and deviation. The analytical results in this paper demonstrate that the conventional modulation index cannot guarantee the linear modulation of the fault-tolerant converter. A rich content of the low frequency current is included in the three-phase current of the converters using the DC-link voltage defined by the conventional indexM, deteriorating the grid stability and causing a secondary fault. The effect of the capacitor voltage deviation and capacitor voltage oscillation on the linear modulation is investigated in detail, and a linear modulation index function is developed. Based on the linear modulation index function, an equation of the minimal DC-link voltage for the linear modulation of post-fault converter is proposed. Experimental results demonstrate that effectiveness of the proposed linear modulation index function.关键词
三相脉宽调制变换器/线性调制/器件故障/容错运行/电压空间矢量调制/低次谐波电流Key words
three-phase pulse width modulation (PWM) converter/linear modulation/power device failure/fault-tolerant/space vector modulation/low-frequency current harmonic分类
信息技术与安全科学引用本文复制引用
曾志勇,郑玮仪,赵荣祥..容错型三相并网变换器线性调制函数分析[J].中国电机工程学报,2016,36(15):4203-4213,11.基金项目
国家重点基础研究发展计划项目(973计划)(2013CB035600)。The National Basic Research Program of China (973 Program)(2013CB035600) （973计划）
