非单位功率因数运行下HERIC型并网逆变器软开关技术研究  

Soft-switching Techniques for HERIC-type Inverter With Non-unity Power Factor

作　　者：王锐彬 牛晨晖 史明明 李明明 肖华锋[1] WANG Ruibin;NIU Chenhui;SHI Mingming;LI Mingming;XIAO Huafeng(School of Electrical Engineering,Southeast University,Nanjing 210096,Jiangsu Province,China;Shenyang University of Technology,Shenyang 110870,Liaoning Province,China;State Grid Jiangsu Electric Power Co.,Ltd.Electric Power Research Institute,Nanjing 211103,Jiangsu Province,China)

机构地区：[1]东南大学电气工程学院,江苏省南京市210096 [2]沈阳工业大学,辽宁省沈阳市110870 [3]国网江苏省电力有限公司电力科学研究院,江苏省南京市211103

出　　处：《中国电机工程学报》2021年第14期4975-4983,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51577033);江苏省自然科学基金项目(BK20171360)。

摘　　要：软开关技术是实现非隔离逆变器高频化及高变换效率的重要途径;同时,新的并网标准要求光伏并网逆变器具有更宽的功率因数运行范围。为此,该文提出一种基于高效可靠逆变器(highly efficient reliable inverter concept,HERIC)拓扑的新型零电流转换并网逆变电路。通过谐振网络的分区域工作模式配合逆变器的无功运行分段调制策略,将软开关运行目标从单位功率因数下的两象限推广到非单位功率因数下的四象限。该文详细分析了软开关逆变器的工作原理,并讨论其谐振轨迹特征、参数设计方法及器件电压电流应力等。最后通过搭建一台50k Hz、1kW原理样机验证了该新型逆变器的可行性。Soft-switching technique is an important way to achieve high frequency and high conversion efficiency for transformerless inverters(TLIs). Meanwhile, new technical standards require grid-connected inverters having a wider power factor range to support grid voltage. In order to fulfill these requirements, a novel zero-current-switching(ZCS) HERIC inverter with full power factor range has been proposed in this paper. By combining piecewise modulation strategy with dual operation modes of ZCS resonant tanks, soft-switching operation of TLIs has been extended to non-unity power factor conditions. The operation principle of the proposed ZCS inverter was analyzed in detail. Furthermore, the resonance trajectory characteristic, resonant parameters design and voltage and current stresses of power devices were also discussed. Finally, the validity of the proposed inverter was verified by a prototype rated at 50 kHz and 1 kW.

关 键 词：非隔离逆变器 非单位功率因数 零电流转换 谐振轨迹 

分 类 号：TM85[电气工程—高电压与绝缘技术]