基于重复扫描法的光伏MPPT算法的研究

Research on photovoltaic MPPT algorithm based on repeated scanning method

当光伏阵列受到不均匀光照时,其P-V(功率-电压)输出特性曲线会出现多极值的情况。为了解决传统的MPPT算法容易陷入局部功率极大值的问题,文章通过对光伏阵列的输出特性和现有MPPT算法的深入研究,提出了一种重复扫描法MPPT算法。在Simulink环境下,分别对P&O(扰动观测法)、基于PSO(粒子群)算法的MPPT算法和重复扫描法MPPT算法进行了仿真测试。试验结果表明,重复扫描法MPPT算法具有振荡幅度小、跟踪速度快和跟踪成功率高等优点。

When the photovoltaic array is exposed to uneven illumination,its P-V(power-voltage)output characteristic curve will have multiple extreme values.In order to solve the problem that the traditional MPPT algorithm is easy to fall into the maximum value of local power,through in-depth research on the output characteristics of the photovoltaic array and the existing MPPT algorithm,this paper proposes a repetitive scanning MPPT algorithm.In the Simulink environment,this paper tested P&O(disturbance observation method),MPPT algorithm based on PSO(particle swarm)algorithm,and repeated scanning MPPT algorithm.The simulation results show that the repeated scanning MPPT algorithm has the advantages of smaller oscillation amplitude,faster tracking speed and higher tracking success rate.