一种新颖的变步长光伏系统MPPT控制方法

A Novel Variable Step-size Controlling Method Used in Maximum Power Point Tracking of PV Power System

摘要:

太阳能光伏阵列的输出功率随外界环境因素的变化而变化,为了能高效地利用太阳能电池,需对光伏阵列进行最大功率点跟踪(简称MPPT);针对定步长电导增量控制法存在的缺点,提出一种新颖的变步长电导增量法;该方法通过瞬时功率相对电流的变化值确定MPPT步长大小,使光伏系统MPPT快速准确且无震荡;经Matlab仿真及实验证明:该方法能快速准确地跟踪外部环境变化,并能保证系统的稳定性。

Abstract:

The maximum power point tracking (MPPT) technique is important for solar photovoltaic systems.For the drawbacks of fixed step-size incremental conductance controlling method,a novel variable step size incremental conductance method is proposed. A way that the step size of MPPT is determined by instantaneous power on the current rate of change can make the PV power system fast ,exact and non-oscillatory. Matlab simulation results show that:this method can track the maximum power point fast and exactly, and ensure the steady state characteristics of PV systems.