基于准Z源逆变器的光伏并网控制  

The control strategy of grid-connected photovoltaic system based on quasi-Z-source inverter

作　　者：姬丽雯 卢子广[1] 胡立坤[1] 曾宪金[1] 蓝希清[1] 

机构地区：[1]广西大学电气工程学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2014年第6期1256-1262,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(61364027);广西科学研究与技术开发项目(桂科攻1377001-2)

摘　　要：针对光伏电池工作时受光照强度、环境温度影响而导致输出电压具有较大波动性这一问题,构建了一种基于准Z源逆变器的光伏并网系统,并采用两级自然坐标控制,通过调节准Z源逆变器的直通占空比来控制直流侧电压稳定;同时,在abc自然坐标下实现对准Z源逆变器的有功和无功的独立控制,避免了参数不准确导致的电流解耦不彻底。对运行中出现的光伏电源输出波动进行的仿真和d SPACE实时控制实验表明,采用该控制策略的基于准Z源逆变器的光伏并网系统能有效抑制光伏电池输出电压波动对并网的影响,向电网输入更高质量的电能。Due to the changes of illumination and temperature, the output voltage of the photovoltaic cells fluctuates largely. To solve this problem, an grid-connected system based on quasi-Z-source in-verter is constructed and natural coordinate control is applied to this system. The voltage of DC side maintain stable by adjusting the shoot-through duty cycle of quasi-Z-source inverter. Meanwhile, the independent control for active and reactive power is implemented in the abc natural coordinate, by which the uncompleted current decoupling caused by inaccurate arguments is avoided effetely. Simu-lation and dSPACE experiments on the situation of the photovoltaic power supply output fluctuations are carried out. The result shows that the grid-connected system based on quasi-Z-source inverter a-dopting the control strategy can effectively inhibit the influences to grid-connection caused by the output voltage fluctuations of the photovoltaic cells and supply high-quality power to grid.

关 键 词：准Z源逆变器 光伏并网系统 自然坐标控制 

分 类 号：TM464[电气工程—电器]