摘要
提出一种改进型全桥并网逆变器,通过交流解耦单元实现在续流阶段光伏侧与电网侧隔离,并通过双向钳位电路将共模电压钳位为直流母线电压的一半,保证共模电压恒定,从而抑制共模漏电流。给出所提逆变器的工作原理、调制策略以及钳位电路,并将该逆变拓扑与已有典型拓扑进行比较分析,最后对所提逆变器进行仿真和实验验证。
An improved full-bridge grid-connected inverter is proposed. In the inverter topology,an AC decoupling unit is used to isolate the PV source from the grid in the current freewheeling periods,and the common-mode voltage is clamped to one-half of the DC bus through a bi-directional clamping circuit. So that,the common-mode voltage is ensured to be constant,and the common-mode leakage current is suppressed effectively. In this paper,the operation principle,modulation strategy,and the clamping circuit of the proposed inverter are presented,and a comparative analysis is carried out between the proposed inverter and the existing typical topologies. Finally,the proposed inverter is verified through simulation and experiments.
作者
王要强
梁海艳
秦明
周成龙
杜冠宇
Wang Yaoqiang;Liang Haiyan;Qin Ming;Zhou Chenglong;Du Guanyu(School of Electrical Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《太阳能学报》
CSCD
北大核心
2021年第8期183-190,共8页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51507155)
河南省高等学校青年骨干教师项目(2019GGJS011)。
关键词
光伏
并网逆变器
漏电流
非隔离
结电容
调制策略
PV
grid-connected inverter
leakage current
non-isolated
junction capacitance
modulation strategy
