基于二次插值法的光伏发电系统控制策略

A Control Strategy for Photovoltaic Generation System Based on Quadratic Interpolation Method

基于二次多项式插值法,提出一种光伏发电系统的出力调整策略。该策略使得当出力需求小于最大出力时,系统能够工作在恒定功率输出模式,以保证光伏发电系统实现功率的灵活调节;而当出力需求大于最大出力时,系统自适应地切换为最大功率点跟踪模式。在介绍二次插值法基本原理的基础上,阐述了采样点数据更新算法、预测工作电压过大的解决措施和短路故障穿越的方法。仿真结果验证了该策略的正确性和可行性。

Based on the quadratic interpolation method,a power control strategy of photovoltaic（PV） generation system is proposed.With this control strategy,the PV system can operate on the power limitation mode to flexibly adjust the power output,and automatically switch to the maximum power point tracking（MPPT） mode when the maximal power output is still less than the demand.Based on the principle of quadratic interpolation method,data updating algorithm of sampling points,solution when the calculated reference voltage is out of limit and the way to achieve the fault ride-through（FRT） capability are discussed.Simulation results verify the correctness and feasibility of the proposed control strategy.