基于功率预测的变步长扰动观测法MPPT研究

Research of kind of variable step size perturbation and observation MPPT based on power prediction

针对光伏阵列输出特性,分析了传统扰动观测法的原理和不足,结合固定电压法和基于功率预测的变步长扰动观测法,提出了一种新的控制算法。使用Matlab/Simulink对该控制算法与传统扰动观测法进行了仿真比较。仿真结果表明该算法有效地提高了系统最大功率点跟踪(MPPT)控制的动态响应速度和稳态跟踪精度,此外,该算法对光照强度突变具有较强的抗干扰能力,能够更好地适应环境变化。

Considering the output characteristic of photovoltaic array, the principle and shortcomings of the traditional PO method was analyzed, and an improved maximum power point tracking（MPPT） algorithm was presented, which was the combination of Constant Voltage algorithm and variable step size PO method based on power prediction.The results of proposed algorithm and traditional algorithms were made by simulating with MATLAB/Simulink program. The simulation results show that the MPPT response speed and accuracy could be greatly improved by the proposed scheme. Moreover, it was more suitable for practical operating conditions due to the strong capability of anti-interference.