光伏并网系统隔离变压器联接方式的应用研究

摘要

This paper proposes an appropriate way for the transformer connection in the grid -connected photovoltaic system through simulation and experiment. First,the isolation transformer and its function are briefly discussed and a theoretical analysis on resonance over-voltage, fault detection and harmonic are conducted. The basic principles on the selection of the photovoltaic grid system isolation transformer are identified. Second, the data obtained through Matlab simulation and experiment is analyzed. The results show that a more appropriate way of transformer connection should be the △/Yn mode in the single-stage grid-connected system. The study in the paper can provide some references for the development of the large-capacity photovoltaic power plant.%对光伏并网系统隔离变压器进行了仿真与实验,探讨适于光伏并网系统的变压器连接方式.对隔离变压器及其作用进行了简要论述,对谐振过电压、系统故障检测及系统谐波等问题进行了理论分析,确定了光伏并网系统隔离变压器连接方式选择的基本准则.研究结果表明,在单级式光伏并网发电系统中,隔离变压器的连接选择△/Yn方式较合适,为今后大容量光伏并网电站的发展提供了基础和依据.