一种用于光电电池系统的单开关DC-DC变换器

2018 International Conference on Power, Instrumentation, Control and Computing (PICC) Pub Date : 1900-01-01 DOI:10.1109/PICC.2018.8384819

A. S. Anooj, Lalgy Gopi

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引用次数: 2

摘要

本文介绍了一种用于低功耗应用的精确控制电压的光电电池供电单开关DC-DC变换器系统。该变换器由降压变换器和共用一个开关的降压-升压变换器组成。转换器允许您同时实现最大功率点跟踪，电池充电和负载电压调节。通过控制开关脉冲的占空比和开关频率来实现最大功率输出和负载电压的调节。因此，降压变换器将在断续电流传导模式下工作，从而能够通过改变开关频率来调节阻抗，从而实现MPP。而升压变换器工作在连续电流传导模式下，通过改变占空比来调节输出电压。MPPT的算法是电导增量算法，在大多数情况下都能得到满意的结果。为了防止电池过充，系统将采用增量电导算法，为电池提供恒定的充电电压。在MATLAB SIMULINK 2016下对该系统进行了测试，取得了满意的结果。

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A single switch DC-DC converter for photo voltaic-battery system

A photo voltaic-battery powered, single switch DC-DC converter system for precise control of voltage for a low power application is presented in this paper. The converter is composed of buck converter and a buck-boost converter sharing a single switch. The converter allows you to implement maximum power point tracking, battery charging, and load voltage regulation simultaneously. The MPPT and load voltage regulation is achieved by controlling duty ratio and switching frequency of the switching pulse. Hence the buck converter will be working under discontinuous current conduction mode which enables to adjust the impedance by changing switching frequency and thus by achieving the MPP. Whereas the buck-boost converter will be working under continuous current conduction mode and output voltage regulation is done by changing duty ratio. The algorithm used for MPPT is incremental conductance algorithm which gives satisfactory results on most conditions. For the protection of battery from overcharging, the system will comes out from incremental conductance algorithm and provides a constant charging voltage the battery. The proposed system is tested under MATLAB SIMULINK 2016 and satisfactory results are obtained.

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2018 International Conference on Power, Instrumentation, Control and Computing (PICC)

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