局部阴影条件下光伏阵列GMPPT算法的研究

摘要

P-V curves of PV arrays show multiple peaks under partial shading condition.A global maximum power point tracking (GMPPT) algorithm is proposed to solve the problem of the traditional maximum power point tracking (MPPT) algorithm.The algorithm consists of two subroutine, by means of detection of partial shadow which decided to use a subroutine.Finally , the algorithm is validated by simulation in matlab.Simulation results show that the algorithm can accurately track the global maximum power point and avoid the scan of the whole P-V curve.Compared with the traditional MPPT algorithm , the algorithm can locate the maximum power point more quickly than the traditional one.%针对局部阴影条件下光伏阵列的P-V曲线呈现多峰值的情况,提出了一种全局最大功率点追踪(GMPPT)算法来解决传统最大功率点追踪(MPPT)算法失效的问题.该算法由子两个子算法构成,通过提出的局部阴影检测手段决定具体使用的子算法.最后将该算法在matlab中进行仿真验证.仿真结果表明,在局部阴影条件下该算法能精确的追踪到全局最大功率点,且避免了对整条P-V曲线的扫描.在均匀光照条件下比传统MPPT算法能更快的定位到最大功率点.