The Open Electrical & Electronic Engineering Journal

2015, 9 : 452-458
Published online 2015 September 30. DOI: 10.2174/1874129001509010452
Publisher ID: TOEEJ-9-452

Variable Step Length Incremental Conductance MPPT Control Based on the Power Prediction

Yu Yunjun , Liu Tao , Wang Shisheng , Xin Jianbo and Ou Yang Haibing
Information School of Nanchang University, Nanchang, Jiangxi, 330031, P.R. China.

ABSTRACT

The MPP of Photovoltaic power system undergoes migration or volatility under the influence of the external environments, especially light intensity changes. MPPT control is a very important method to increase the efficiency of the photovoltaic power generation system. But the existing variable step length incremental conductance method would produce misjudgment or even tracking failure when outside light intensity mutations. A variable step length incremental conductance MPPT control method based on power prediction has been proposed. This involves modeling, simulation and comparison of the different methods in the Matlab/Simulink environment. The proposed method can not only avoid misjudgments but can also track the MPP efficiently, improving the control accuracy compared with the variable step length incremental conductance method.

Keywords:

MPPT, power prediction, variable step length incremental conductance method..