Variable Step Size Maximum Power Point Tracker Using a Single Variable for Stand-alone Battery Storage PV Systems

Emad M. Ahmed

doi:10.6113/JPE.2011.11.2.218

2011-03-20

Emad M. Ahmed *

Masahito Shoyama

DOI：10.6113/JPE.2011.11.2.218

原文链接

原文求助

摘要

En 中文

The subject of variable step size maximum power point tracking (MPPT) algorithms has been addressed in the literature. However, most of the addressed algorithms tune the variable step size according to two variables: the photovoltaic (PV) array voltage (V-PV) and the PV array current (I-PV). Therefore, both the PV array current and voltage have to be measured. Recently, maximum power point trackers that are based on a single variable (I-PV or V-PV) have received a great deal of attention due to their simplicity and ease of implementation, when compared to other tracking techniques. In this paper, two methods have been proposed to design a variable step size MPPT algorithm using only a single current sensor for stand-alone battery storage PV systems. These methods utilize only the relationship between the PV array measured current and the converter duty cycle (D) to automatically adapt the step change in the duty cycle to reach the maximum power point (MPP) of the PV array. Detailed analyses and flowcharts of the proposed methods are included. Moreover, a comparison has been made between the proposed methods to investigate their performance in the transient and steady states. Finally, experimental results with field programmable gate arrays (FPGAs) are presented to verify the performance of the proposed methods.

Keyword:

Field programmable gate arrays

Fixed step size

Maximum power point (MPP)

Maximum power point tracking (MPPT)

PV array

Single current sensor

Stand-alone Battery Storage

Variable step size