A combinational power sharing strategy based on master-slave and droop methods for power-electronics-interfaced distributed generation units operating in a DC micro-grid

S. Rahmani, M. Saeidi, A. Pirayesh
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引用次数: 3

Abstract

Renewable energy sources (RESs), distributed energy sources (DERs), and energy storage systems (ESSs) grid integration resulted in forming microgrid (MG) concept. Recently, DC microgrids (DC-MGs) have gained intensive attention compared to AC microgrids due to their high reliability and efficiency, easy interface with RESs and ESSs, and simple control. Proper power sharing is one of the most important challenges in islanding operation of DC-MGs. Power sharing methods are implemented in the islanded DC-MGs in order to share the load demand between DGs based on their capacity, and to maintain voltage in the desired range. In this paper, principles and flaws of droop and master-slave power sharing methods are individually discussed. Moreover, the proper voltage and current controller is designed for each distributed generation (DG) unit of DC-MG. In order to exploit positive features and mitigate negative effects of mentioned power sharing methods, a combinational master-slave and droop method is presented. Finally, various scenarios are carried out on a test DC-MG using Matlab/Simulink software in order to compare proposed power sharing method with droop and master-slave methods in the terms of their dynamic response, accuracy, and power sharing error.
基于主从和下垂方法的直流微电网电力电子接口分布式发电机组组合功率共享策略
可再生能源(RESs)、分布式能源(DERs)和储能系统(ess)并网形成了微电网(MG)概念。近年来,与交流微电网相比,直流微电网(DC- mg)因其可靠性高、效率高、易于与RESs和ess接口、控制简单而受到广泛关注。正确的功率共享是直流电机孤岛运行的重要挑战之一。在孤岛直流- mg中实现了功率共享方法,以便在dg之间根据其容量共享负载需求,并将电压保持在期望范围内。本文分别讨论了下垂和主从权力共享方法的原理和缺陷。在此基础上,设计了适合DC-MG各分布式发电单元的电压、电流控制器。为了充分利用上述权力共享方法的优点,减轻其负面影响,提出了一种主从和下垂相结合的权力共享方法。最后,利用Matlab/Simulink软件对DC-MG进行了多种场景测试,比较了本文提出的功率共享方法与下垂和主从方法在动态响应、精度和功率共享误差方面的差异。
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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