摘要
针对光伏并网微逆变器的特点,研究了结构简单且具有隔离作用的交错反激变换器。通过建立简化的反激变换器电路模型,分析了交错反激变换器的控制特点,以最大功率跟踪(MPPT)控制得到的电流为基准,对反激变压器的一次侧进行平均电流控制,实现半波正弦电流输出;针对交错反激变换器可能出现负载不平衡的现象,增加了负载平衡控制环;建立了光伏电池的数学模型,推导出输入解耦电容与光伏电池板利用率的关系,通过选择合适的输入电容容量,有效地提高了系统运行效率。最后通过Matlab/Simulink仿真和样机实验验证了控制的有效性,得到了较好的输出波形。
According to the features of grid-connected PV microinverter controller,an interleaved flyback with a simple and isolated structure was used.In this paper,by simplifying the circuit model of flyback converter,the converter’s control characteristics is analyzed,and the current which obtained from maximum power point tracking（MPPT） control is made as the benchmark,and then control the flyback transformer original side with the average current control method to realize the half sinusoidal current output.For the interleaved flyback converter may appear load imbalance,a load balance control loop is proposed.Establish a mathematical model of the photovoltaic cell,and deduce the utilization relationship between input decoupling capacitor and the photovoltaic cell panel.By choosing the appropriate input capacitance,the efficiency of system is improved effectively.At last,the effectiveness of the controller is validated in the Matlab/Simulink simulation environment,and a better output waveform is achieved from a converter test.
出处
《电工技术学报》
EI
CSCD
北大核心
2013年第5期142-147,153,共7页
Transactions of China Electrotechnical Society
基金
教育部创新团队发展计划(IRT1072)
辽宁省高校创新团队支持计划(LT2011003)资助项目
关键词
光伏并网
交错反激变换器
建模
光伏电池板利用率
Photovoltaic grid-connected
the interleaved flyback converter
modeling
the utilization of photovoltaic panels
