光伏阵列最大功率跟踪变论域模糊控制

Maximum Power Point Tracking of Photovoltaic Array Using Variable Universe Fuzzy Controller

光伏阵列的输出功率随着环境条件和负载改变而变化,为了充分利用光伏阵列的输出,需对其进行最大功率跟踪控制。本文用变论域模糊控制方法实现最大功率跟踪控制,该方法利用论域收缩因子,在保证响应快速性的前提下,提高了稳态跟踪精度。本文方法与扰动观察法和基本模糊控制方法进行了对比研究,结果表明本文方法能够获得更快的响应速度,更高的跟踪精度和更大的功率输出,更适合进行光伏阵列的最大功率跟踪控制。

The output power ofphotovoltaic （PV） array varies with the changes of the environment and the load. Maximum power tracking control is used to take full advantage of the photovoltaic array. The variable universe fuzzy control method is proposed to implement maximum power tracking control. In order to improve the tracking accuracy and to guarantee the quick response, the universe shrinking factor is used to change the input fuzzy variable universe according to the tracking error. A comparison study is performed for the perturb and observe （P＆O） method, the basic fuzzy control and the variable universe fuzzy control. The simulation and experimental results show that the proposed method can obtain a faster tracking speed, a higher tracking accuracy and a larger power output. The proposed method is suitable for PV array maximum power tracking control.