摘要
单个光伏模块由3~4个子模块组成,在1个或多个子模块受局部阴影影响时,即使每个光伏模块配备一台微逆变器也会导致光伏功率损失。在桥式光伏微逆变器的基础上,增加了一个LC谐振单元以及与子模块数量匹配的倍压整流器,形成了一个不需单独控制的均压器结构。该均压器可以对受局部阴影影响的子模块补偿电流,使得各子模块输出电压尽量保持接近,从而实现光伏模块输出功率稳定在最大功率点。分析了均压器的工作模态以及参数设计准则,通过仿真与实验样机验证了均压器在提升光伏模块功率获取率上具有显著的优势。
There are 3~4 submodules in a PV module. When the illumination intensity is different on these submodules, the output power is dramatically decreased even if a micro-inverter is equipped for a PV module. Based on the full-bridge PV micro-inverter, an equalizer is proposed which is composed of an LC series resonant network and several voltage doubler rectifiers. The proposed equalizer can be well operated without any additional control and it can supply the current/energy to the submodule under part shadow. In this way, all of the PV submodules can be operated near their maximum power point. The operational modes and the design principle of parameters are analyzed for the equalizer. The simulation and experimental results verify the obvious advantage in increasing the power acquisition rate of PV panels.
作者
吴冬春
王贻鑫
吴云亚
阚加荣
陈小海
WU Dongchun;WANG Yixin;WU Yunya;KAN Jiarong;CHEN Xiaohai(College of Electrical Engineering,Yancheng Institute of Technology,Yancheng 224051,Jiangsu Province,China;Jiangsu Goldwind Technology Co.,Ltd.,Yancheng 224100,Jiangsu Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2021年第4期1265-1272,共8页
Power System Technology
基金
国家自然科学基金资助项目(51577164)
江苏省“青蓝工程”中青年学术带头人培养对象资助项目
江苏省第五期“333工程”项目
江苏省“六大人才”高峰项目(XNY-045)的资助。
关键词
光伏微逆变器
均压器
差分功率处理
LC谐振
功率获取率
PV micro-inverter
equalizer
differential power processing
LC resonace
power acquisition ratio
