带有MPPT算法的改进型分时复合控制策略研究

基于两级式光伏并网逆变器分时复合控制原理,提出一种带有MPPT算法的改进控制方案,并采用数字陷波器抑制光伏测二次电压脉动,为MPPT提供稳定的电压参考,同时给出输入侧解耦电容计算方法。在此基础上,采用损耗分析的方法,详细对比了改进型分时复合控制策略及传统控制策略下的系统损耗。最后搭建了两台实验样机进行实验验证,实验结果表明所提出的改进分时复合控制策略的可行性,并得出分时复合策略较传统控制策略的优缺点。

Research on the Improved Time-Sharing Control Strategy with MPPT Algorithm

An improved time-sharing control strategy was presented for the two-stage grid-tied PV inverter. To provide a stable reference voltage for the MPPT algorithm, a kind of digital notch filter for low frequency ripple was adopted. A kind of calculation of input decoupling capacitance was provided, and meanwhile, system loss analysis of two control strategies was given in detail. Finally, two prototypes were built, and the experimental results demonstrate the feasibility of the improved time-sharing control strategy, and show the merits and drawbacks of these two control strategies.