基于一种改进的二分法的MPPT算法

研究分析当前光伏系统中最大功率点追踪技术(MPPT)现状,发现传统MPPT方法在最大功率点处易出现振荡、扰动步长较大增加振荡或较小造成跟踪时间较长等问题。针对传统MPPT算法在稳态与动态性能之间的不足,提出一种改进的变步长二分算法。该算法设置一个较大的初始步长以确定MPP大概位置,随后利用二分算法对步长进行多次减半直到追踪到最大功率点。在Matlab/Simulink环境下对主流MPPT方法进行仿真分析,并与传统的MPPT算法进行对比验证此算法的可行性。仿真结果验证该算法的快速性与可行性,即能实现在最大功率点处的快速跟踪。

The current status of maximum power point tracking(MPPT)technology in photo voltaic systems is analyzed.It is found that the traditional MPPT method is prone to oscillation at the maximum power point,and the oscillation with large increase of disturbance step size or small increase of disturbance step-size leads to long tracking time.Aiming at the deficiency of traditional MPPT algorithm between steady state and dynamic performance,an improved variable step-size algorithm dichotomy is proposed.The algorithm sets a large initial step-size and then uses the improved dichotomy algorithm to halve the step size several times until the maximum power point is tracked.In the Matlab/Simulink environment,the main MPPT method is simulated and analyzed,and compared with the traditional MPPT algorithm to verify the feasibility of this algorithm.The simulation results show the feasibility and superiority of the proposed algorithm,which can achieve fast tracking at the maximum power point.