光伏并网逆变器固定开关频率控制策略的研究

摘要

从三相光伏并网逆变器的拓扑结构及数学模型入手,对逆变器基于固定开关频率控制策略进行了详细的分析与阐述.结合坐标变换和电流解耦控制策略构建了逆变器直流电压、电流内环的双闭环控制结构,对双环控制器的取值给出了较为合理的参数,并结合TMS320LF2407处理器搭建了实验验证平台.通过逆变器输出电流波形及PWM输出波形的分析,验证了固定开关频率控制策略的可行性.%In this paper, a current control mathematical model was established in detail with fixed swiching frequency for photovoitaic grid-connected inverter Based on the vector transform and decoupling strategy, the simppe models of the inner current control loop and the outer voltage loop were built. The value of the double-controller was given the reasonable parameters. Meanwhile, the eperimental verificalion platform was built with TMS320LF2407 prcessor and other circuit elements, Through analysis of inverter putput current waveform and PWM output waveform, the fixed swiching frequency control strategy was proved feasible