基于全局扫描的局部遮挡下MPPT算法研究

Research of MPPT Algorithm Based On Global Scan in Local Occlusion

局部遮挡下,由于光伏阵列输出功率—电压(P-U)曲线具有多峰值,致使MPPT技术因收敛于局部最大值点而无法发挥作用。鉴于此,采用扰动观察法的全局搜索方法克服上述问题,实现在多峰值情形下最大功率点有效跟踪。同时,测试实验表明该方法具有相对较好的快速性与有效性。

When the output power- voltage（ P- U） curve of PV array shows multi- peak phenomenon,the traditional maximum power point tracking（ MPPT） may fail to converge due to the local maximum point. On the basis of analysis of P- U curve model under multi partial shading,a global scan method based on perturbation and observation was designed,which could achieve the MPPT under multi- peak phenomenon. Theoretical analysis and experimental results from related engineering test on 3 k W photovoltaic grid inverter experimental platform demonstrated that the control algorithm was a very effective and fast.