基于模糊PI的光伏发电双MPPT研究

Fuzzy PI Control Based Dual MPPT Control Method for Photovoltaic Power Generation

针对光伏阵列非线性工作特性及传统MPPT控制中响应外界环境变化缓慢、最大功率点附近功率振荡现象明显等缺点,对其最大功率点跟踪算法进行分析,提出了一种模糊PI控制下扰动观察法(P&O)和恒电压控制法(CVT)相结合的双MPPT(dual maximum power point tracking MPPT)控制方法应用于光伏发电系统。通过建立模糊PI控制下的光伏发电双MPPT系统模型,构建系统控制量及变化量变化规则,设计仿真参数。仿真实验结果表明本方法在外部环境变化时能快速准确地跟踪光伏阵列最大功率点,具有良好的动态和稳态性能。

For the shortcomings that photovoltaic array has nonlinear working characteristic, and traditional MPPT （maximum power point tracking） control is slow in response to change of external environment and has clear power oscillation near the maximum power point, this paper analyzes the maximum power point tracking algorithm, and proposes a fuzzy PI control based dual MPPT control method for photovoltaic power generation system. A dual MPPT system model of photovoltaic power generation under fuzzy PI control is established, the change rules of the system control quantity and the system variables are constructed, and the simulation parameters are designed. Simulation shows that the proposed control method can quickly and accurately track the maximum power point of PV array with good dynamic and steady state performance in changing external environment.