单一直流源的七电平混合级联逆变器  

The Hybrid Cascaded Inverter with Single Voltage Source

作　　者：何凯益 任磊[1] 龚春英[1] 邓翔[1] He Kaiyi;Ren Lei;Gong Chunying;Deng Xiang(Jiangsu Key Laboratory of New Energy Generation and Power Conversion Nanjing University of Aeronautics & Astronautics Nanjing 210016 China)

机构地区：[1]江苏省新能源发电与电能变换重点实验室(南京航空航天大学),南京210016

出　　处：《电工技术学报》2016年第18期83-91,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51377079)

摘　　要：针对传统的两单元H桥混合级联逆变器需要两个独立的直流源问题,采用电容来代替低压单元直流源,只需高压单元直流源就可实现级联逆变器七电平输出。在载波层叠PWM调制方式下,可以通过选择输出电平的不同组合方式来控制电容充放电,分析了电容电压稳定到高压单元直流源二分之一电压所需满足的条件,得到决定电容电压能否稳定到目标值的两个因素。通过损耗分析比较,得到电容电压稳定控制的最优方案。最后系统仿真与实验结果验证了理论分析的正确性。Traditional two-unit H-bridge hybrid inverters need two different voltage sources. Thispaper adopts capacitances instead of low voltage source, accordingly only high voltage source isneeded to achieve 7-level output. With the multi-carrier stacked PWM modulation, the charge status ofthe capacitance can be controlled by choosing different combination levels. This paper analyses theconditions that control the capacitance voltage to the half value of the high voltage source.Consequently, two factors that determine whether the capacitance voltage is stable are achieved. Bycomparing the power loss, the optimum scheme is obtained to realize the purpose of holding thecapacitance voltage to the half value of the high voltage source. Last, system simulation andexperiments verify the proposed strategy.

关 键 词：混合级联式逆变器 单一直流源 多电平逆变器 电容电压控制 

分 类 号：TM464[电气工程—电器]