摘要
针对传统的两级式光伏并网单相逆变系统能量转换效率不高、抗干扰能力较差等问题,对其控制策略进行了分析与研究。在前级升压斩波电路中,为使太阳能板达到最高的能量转换效率,采用了变步长扰动观察法进行最大功率点的跟踪;在后级单相全桥逆变电路中采取了电压、电流双闭环策略,其中外环采用比例积分调节实现直流母线电压的稳定以及为内环提供参考电流,内环采用比例谐振调节实现对并网电流的无静差控制。在该系统中,前级最大功率点跟踪策略与后级的双闭环控制两者互不干扰。最后利用MATLAB/Simulink进行了仿真,验证了最大功率点跟踪策略、比例谐振控制器、锁相环环节以及整体系统的可行性与有效性。
The traditional two⁃level photovoltaic grid connected single⁃phase inverter system has some problems,such as low energy conversion efficiency and poor anti⁃interference ability.The control strategy of two⁃level photovoltaic grid connected single⁃phase inverter system was analyzed and studied.In the front⁃level boost chopper circuit,in order to achieve the highest energy conversion efficiency of the solar panel,a variable step disturbance observation method was adopted to track the maximum power point.In the latter⁃level single⁃phase full⁃bridge inverter circuit,a voltage and current double closed⁃loop strategy was adopted.The outer loop adopts proportional integral regulation to stabilize the DC bus voltage and provide reference current for the inner loop.The inner loop adopts proportional resonance regulation to control the grid connected current without static error.The maximum power point tracking strategy of the front⁃level and the double closed⁃loop control of the latter⁃level do not interfere with each other.Finally,a simulation was performed using MATLAB/Simulink to verify the feasibility and effectiveness of the maximum power point tracking strategy,proportional resonant controller,phase⁃locked loop link and the overall system.
作者
王傲
张厚升
朱胜杰
靳舵
蒋俊杰
WANG Ao;ZHANG Housheng;ZHU Shengjie;JIN Duo;JIANG Junjie(College of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255022,China)
出处
《山东电力技术》
2022年第5期7-12,共6页
Shandong Electric Power
基金
国家自然科学基金面上项目(62076152)
2021年山东省研究生教育质量提升计划“《现代电力传动控制系统》优质课程”(SDYKC21127)。
关键词
光伏阵列
最大功率点跟踪
比例谐振控制
锁相环
photovoltaic array
maximum power point tracking
proportional resonance control
phase locked loop
