摘要
针对传统非隔离无变压器光伏并网逆变器存在漏电流而影响系统安全稳定运行的问题,提出了一种新型非隔离型六开关(H6)拓扑的光伏并网逆变器.新型H6拓扑在两桥壁之间增加了一条连接线,且删除了两个连接二极管,控制策略采用了直接电流控制的脉宽调制技术.该拓扑在一个电网周期内具有六种工作模式,整个工作过程中具有恒定的共模电压.基于上述理论分析,在M atlab/Simulink环境中建立了仿真模型,并搭建了实验样机.结果表明:所提出的非隔离H6型光伏并网逆变器具有较好的漏电流抑制效果,且能够为电网提供一定的无功支撑.
In order to solve the problem that the system secure and stable operation is affected by the leakage current existing in the traditional non-isolated transformerless photovoltaic （PV） grid-connected inverter, a novel non-isolated six-switch （H6） topology photovoltaic grid-connected inverter was proposed. A connection line between two bridge walls was added in the novel H6 topology, and two connecting diodes were removed. In addition, the control strategy adopted the pulse width modulation technology controlled by direct current. The topology had six operating modes in a power grid period, and possessed a constant common-mode voltage throughout the operation. Based on the above-mentioned theoretical analysis, a simulation model was established in the Matlab/Simulink environment, and an experimental prototype was built. The results show that the proposed non-isolated H6 photovoltaic grid-connected inverter has good leakage current suppression effect, and can provide a certain reactive power support for the power grid.
作者
李研达
LI Yan-da(School of Physics and Electrical Engineering, Anyang Normal University, Anyang 455000, Chin)
出处
《沈阳工业大学学报》
EI
CAS
北大核心
2018年第3期253-257,共5页
Journal of Shenyang University of Technology
基金
河南省科技攻关计划资助项目(152102210294)
关键词
光伏并网逆变器
非隔离型
六开关
漏电流
共模电压
运行模式
调制策略
二极管
photovoltaic grid-connected inverter
non-isolated type
six switches
leakage current
common mode voltage
operation mode
modulation strategy
diode
