﻿ 一种改进的扰动观测法在光伏MPPT中的应用 An Improved Perturbation and Observation Used in Maximum Power Point Tracking Control of Photovoltaic Power System

Journal of Electrical Engineering
Vol.05 No.01(2017), Article ID:19898,5 pages
10.12677/JEE.2017.51001

An Improved Perturbation and Observation Used in Maximum Power Point Tracking Control of Photovoltaic Power System

Qianqian Xu, Jing Hui

Key Laboratory of Advanced Process Control for Light Industry, Ministry of Education, Jiangnan University, Wuxi Jiangsu

Received: Feb. 23rd, 2017; accepted: Mar. 13th, 2017; published: Mar. 16th, 2017

ABSTRACT

The output of the photovoltaic array is nonlinear. In order to improve the efficiency of solar power generation, the maximum power point tracking is needed. Traditional disturbance observation method is widely used, but it is difficult to balance the tracking accuracy and response speed. When the light changes drastically, the traditional method may produce a false judgment. Aiming at these problems, a new method is proposed. The improved algorithm can search the maximum power point quickly, and restrain the fluctuation near the maximum power point. The simulation of photovoltaic system is carried out by MATLAB, and the effectiveness of the improved algorithm is proved.

Keywords:Photovoltaic Array, Maximum Power Point Tracking, Perturbation and Observation Method, Variable Step Size

1. 引言

2. 光伏电池模型与特性

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3. 扰动观测法的基本原理

Figure 1. The equivalent model of the photovoltaic cell

Figure 2. The volt-ampere characteristic curve of photovoltaic arrays

4. 改进的变步长阀值搜索

Boost变换器输出电流连续、平稳、且纹波较小，因此选择Boost变换器作为MPPT的实现电路，连接如图3所示。通过调节DC/DC变换器开关管的占空比实现输出阻抗和负载阻抗的匹配，从而使系统始终工作在最佳状态，给负载提供最大的功率。

Figure 3. The MPPT implementation circuit

Figure 4. The control flow chart of improved perturbation method

5. 仿真结果与分析

Figure 5. The simulation results

6. 结论

An Improved Perturbation and Observation Used in Maximum Power Point Tracking Control of Photovoltaic Power System[J]. 电气工程, 2017, 05(01): 1-5. http://dx.doi.org/10.12677/JEE.2017.51001

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