基于扰动观察法的MPPT误判校正控制策略

MPPT Misjudgment Correction Control Strategy Based on Perturb and Observe Method

当辐照度发生突变时,采用传统的扰动观察法进行MPPT控制存在误判现象,造成一定的功率损失。提出一种新颖的MPPT误判校正控制方法,结合光伏并网逆变器的矢量控制策略,通过周期性的解除电压环控制,调整光伏阵列工作电压点,减小误判对输出功率的影响,提高光伏系统的发电效率。在500 k W光伏并网逆变器上进行测试,结果验证该控制方法的有效性。

Under the sudden change of solar irradiation,the traditional perturb and observe method for MPPT control has misjudgment problem and some power loss.A novel method of misjudgment correction control method for MPPT is proposed.Combined with the vector control strategy of photovoltaic grid-connected inverter,the voltage loop control is periodically removed to adjust the working voltage point of photovoltaic array,so as to reduce the influence of misjudgment on output power and improve the power generation efficiency of photovoltaic system.The test results on a 500kW photovoltaic grid-connected inverter demonstrate the effectiveness of the proposed control method.