有源钳位三电平变频器改进SVPWM策略  

Improved SVPWM Strategies for Active Neutral Point Clamped Converters

作　　者：戴鹏[1] 石祥龙[1] 朱晓莹[1] 朱信威 Dai Peng;Shi Xianglong;Zhu Xiaoying;Zhu Xinwei(School of Information and Electrical Engineering China University of Mining Technology,Xuzhou 221008 China)

机构地区：[1]中国矿业大学信息与电气工程学院,徐州221008

出　　处：《电工技术学报》2017年第14期137-145,共9页Transactions of China Electrotechnical Society

基　　金：江苏省青蓝工程(04150020);江苏省普通高校研究生科研创新计划(SJLX_0631)资助项目

摘　　要：中点钳位(NPC)三电平变频器存在功率器件损耗不平衡问题,部分器件发热严重,限制了变频器容量和开关频率的提升,有源中点钳位(ANPC)三电平变频器通过不同的零电压输出状态可以平衡功率器件的损耗。通过选取不同的冗余零状态,提出一种适用于ANPC三电平变频器、可以平衡功率器件损耗的改进空间矢量调制(SVPWM)算法。对所提SVPWM算法和传统正弦矢量脉宽调制(SPWM)算法进行仿真对比,分析功率器件损耗分布情况,结果表明所提方法可以平衡功率器件的损耗,提高变频器的容量和开关频率。另外,和SPWM算法相比,采用SVPWM算法输出电压可以提高15%,电流谐波畸变率会有所降低,最后通过实验验证了所提算法的正确性。Uneven distributions exist among the power devices in traditional neutral pointclamped(NPC)three-level converter.The severe heat of some devices limits the output power andswitching frequency.Active neutral point clamped(ANPC)three-level converter can balance the lossdistribution that benefits from the addition of more zero switching states.Based on the selection ofprimary and secondary zero states,this paper presents an improved SVPWM method for ANPCthree-level converte.Compared with traditional SPWM,the improved SVPWM method can balance theloss distribution,and improve the capability and switching frequency of the converter.In addition,15%voltage conversion ratio and lower harmonic distortion can be achieved.Finally,experimental resultsverify the effectiveness of the design method.

关 键 词：有源中点钳位 三电平变频器 损耗平衡 电压利用率 

分 类 号：TM46[电气工程—电器]