基于滞环电流控制具有升压能力非隔离双接地光伏并网逆变器  

Double-grounded Transformer-less Buck-Boost Photovoltaic Grid-connected Inverter Based on Hysteresis Current Control

作　　者：吴子阳 肖岚[1] 姚志垒 王勤[1] WU Ziyang;XIAO Lan;YAO Zhilei;WANG Qin(College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,Jiangsu Province,China;Shanghai Maritime University,Pudong New District,Shanghai 201306,China)

机构地区：[1]南京航空航天大学自动化学院,江苏省南京市210016 [2]上海海事大学,上海市浦东新区201306

出　　处：《中国电机工程学报》2021年第23期8097-8106,共10页Proceedings of the CSEE

基　　金：国家自然科学基金项目(61673210,52077131)。

摘　　要：传统非隔离光伏并网逆变器只能工作在降压模式,并存在共模漏电流问题。基于此,该文研究一种非隔离双接地升降压光伏并网逆变器。所提逆变器在1个电网周期内存在Buck、Boost和Buck-Boost 3种工作模式。每种工作模式采用滞环电流控制。每个工作模式只有1个功率管高频工作,从而提高系统效率。阐述该逆变器的工作原理,设计滤波器参数,分析系统稳定性,针对该拓扑在滞环控制下的工作特点,给出对应的损耗计算方法。最后,通过搭建一台330W的实验平台,验证所提理论的正确性。The conventional transformer-less PV grid-connected inverters can only operate in buck mode and have common mode leakage current problem.In order to solve the aforementioned problems,a transformer-less double-grounded buck-boost PV grid-connected inverter was proposed.The inverter had three operating modes in one grid cycle,i.e.,Buck,Boost and Buck-boost.The hysteresis current control as adopted.Only one switch was operated in high frequency in each operating mode,so efficiency of the system could be improved.Operating principle,parameters design and stability analysis of the inverter were illustrated.A reasonable loss calculation method according to the characteristics of the topology under the hysteresis control was given.Finally,a 330W prototype verifies the theoretical analysis.

关 键 词：共模漏电流 非隔离 双接地 并网逆变器 滞环电流控制 

分 类 号：TM46[电气工程—电器]