摘要
光伏并网发电是新能源开发利用的一个重点发展方向,其核心部件是并网逆变器,传统无隔离H桥逆变器无法抑制共模电流,本文研究了新型H5桥逆变器拓扑,与传统H桥逆变器相比,只增加了一个开关管,使得在续流阶段光伏模块和电网之间隔离,实现共模漏电流的抑制;设计了H5桥拓扑双L滤波器,提出了基于准比例谐振控制的双环控制策略;搭建了H5桥逆变器实验平台,验证了H5桥拓扑结构能有效地抑制共模电流,控制策略具有良好的动态和稳态性能,并网电流谐波小。
The photovoltaic grid-connected power development and utilization of renewable energy and generation is a key development direction for the its core components are grid-connected inverter.The traditional non-isolation H5 inverter can not suppress and control the common mode current.In this paper, a new type of H5 bridge inverter topology is developed wich, compared to the traditional one, has only one switch tube added so to keep isolation between PV module and and power grid during the current flowing period and achieve suppression of the common mode leakge current.Double L filter of H5 bridge topology is designed and the double loop control strategy based on quasi proportiona reasonant control is proposed.The experimental platform of H5 bridge inverter is set up and it is demonstrated that the H5 bridge topological structure can suppress effectively common mode current,the control strategy has good dynamic and static perofrmance and the grid-connected current has small harmonic.
出处
《电力电容器与无功补偿》
北大核心
2017年第5期171-175,180,共6页
Power Capacitor & Reactive Power Compensation
关键词
光伏并网逆变器
H5桥拓扑
共模电流
准比例谐振
photovoltaic grid-connected inverter
H5 bridge topology
common mode current
quasiproportional resonance
