一种改进中点钳位型HERIC电路拓扑研究  

STUDY ON CIRCUIT TOPOLOGY FOR IMPROVED NEUTRAL-POINT-CLAMPED HERIC

作　　者：赵亚洲 王春宁 周万鹏 杨艳 廖红华 Zhao Yazhou;Wang Chunning;Zhou Wanpeng;Yang Yan;Liao Honghua(College of Electrical Engineering,Qingdao University,Qingdao 266071,China;State Grid Dezhou Power Supply Company,Dezhou 253000,China;College of Information Engineering,Hubei Minzu University,Enshi 445000,China)

机构地区：[1]青岛大学电气工程学院,青岛266071 [2]国网德州供电公司,德州253000 [3]湖北民族大学信息工程学院,恩施445000

出　　处：《太阳能学报》2021年第8期128-132,共5页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(61263030,61463014)。

摘　　要：在HERIC电路拓扑的基础上提出一种改进中点钳位型HERIC拓扑。该拓扑通过在光伏逆变器直流输入电容的中点与主电路桥臂之间加入2个开关管,将桥臂处2点电压有效钳位且电压值为输入端电容电压的一半,且共模电压保持不变,从而达到抑制漏电流目的。通过仿真和实验验证了所提出电路具有效率高、抑制能力好的特性。This paper proposes an improved midpoint clamped HERIC topology based on the HERIC circuit topology. This topology adds two switching tubes between the midpoint of the DC input capacitor of the photovoltaic inverter and the main circuit bridge arm.The voltages at the bridge arm and the voltage value is effectively clamped which is half of the input capacitor voltage. The total commonmode voltage remains unchanged to achieve the purpose of suppressing leakage current. Simulations and experiments verify that the proposed circuit has the characteristics of high efficiency and good suppression.

关 键 词：光伏 逆变器 漏电流 中点钳位型HERIC 

分 类 号：TM464[电气工程—电器]