局部遮挡下的自适应变步长扰动观察法

Adaptive variable step size perturbation and observation method under partial shading

在局部遮挡下,光伏阵列输出功率—电压(P-U)曲线呈现多峰值现象,传统最大功率点跟踪方法可能因收敛于局部最大值点而失效。在分析多种局部遮挡情况下P-U曲线模型的基础上,设计了一种自适应变步长扰动观察法,能实现多峰值现象下的最大功率点跟踪。在3 k W光伏并网逆变器的实验平台上进行相关工程实验,理论分析及实验结果证明了控制算法的有效性和快速性。

Under partial shading, the PV array output power-voltage （P-U） curve shows multi-peak phenomenon. The traditional maximum power point tracking （MPPT） may fail due to converge to a local maximum point. On the basis of analysis of P-U curve model under multi partial shading, the adaptive vadable step size perturbation and observation method was designed and can achieve the MPPT under multi-peak phenomenon. Related engineering test was conducted on 3 kW PV grid inverter experimental platform. The theoretical analysis and experimental results demonstrate the effectiveness and fast performance of the control algorithm.