太阳能光伏系统中基于自适应控制的最大功率点跟踪方法研究

为了提高光伏发电系统的整体效率,寻求光伏电池的最优工作状态,提出一种基于自适应控制的光伏电池最大功率点跟踪(maximum power point tracking,MPPT)方法。该方法基于传统的干扰观察法原理,并根据系统工作点的不同而不断调整扰动幅度的大小,以最大限度地接近最大功率点。仿真结果表明,基于自适应控制的MPPT方法能够稳定、高效地跟踪光伏阵列最大功率点;在日照强度、环境温度等系统参数扰动的情况下,能快速寻找新的工作点,保持系统稳定,表现出很好的动态特性。

Research on Maximum Power Point Tracking Method Based on Adaptive Control in Solar Photovoltaic System

In order to raise efficiency of photovoltaic system and in pursuit of optimum operating status of photovoltaic cells, a maximum power point tracking method （MPPT） for photovoltaic cells based on adaptive control is proposed. The method is on the basis of perturb and observe method and adjusts disturbance amplitude in accordance with variation of working point of the system so as to approach the maximum power point as possible. The simulation result shows that MPPT based on adaptive control can stably and efficiently track maximum power point of photovoltaic array; under circumstance of disturbance of such parameters as sunlight intensity, ambient temperature and etc, the method can seek new working point rapidly, keep the system stable and show good dynamic performance.