Voltage regulation and stabilization of DC/DC buck converter under constant power loading

2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES) Pub Date : 2014-12-01 DOI:10.1109/PEDES.2014.7042054

Suresh Singh, D. Fulwani

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引用次数: 15

Abstract

The low and medium voltage renewable energy based dc distribution systems are catching increased attention world-wide due to their inherent benefits over ac systems. Higher efficiency, simple control, more suitable for integration of the sources producing dc power, are some of the main benefits of the dc systems. However, these systems are prone to serious stability issues caused by the constant power load (CPL) nature of the point-of-load converters (POLs). This paper deals with the stabilization and voltage regulation of dc/dc buck converter feeding a combination of the constant voltage resistive load (CVL) and CPL in a dc micro-grid application. A sliding mode controller is proposed which ensures supply of constant power demanded by the CPL and tight voltage regulation (error less than 0.1 V) of the output voltage. The effectiveness of the controller is validated through simulation results under different operating conditions. It is shown that the controller is robust to the large changes in supply voltage and the load.

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恒功率负载下DC/DC降压变换器的稳压与稳定

基于可再生能源的低压和中压直流配电系统由于其固有的优点而越来越受到全世界的关注。更高的效率，简单的控制，更适合集成产生直流电源，是直流系统的一些主要优点。然而，由于负载点转换器(pol)的恒定功率负载(CPL)特性，这些系统容易出现严重的稳定性问题。本文研究了直流微电网中恒压电阻负载和恒压电阻负载组合馈入的dc/dc降压变换器的稳定和稳压问题。提出了一种滑模控制器，既能提供CPL所需的恒定功率，又能严格调节输出电压(误差小于0.1 V)。通过不同工况下的仿真结果验证了该控制器的有效性。结果表明，该控制器对电源电压和负载的较大变化具有较强的鲁棒性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)

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