A seamless switching control strategy of photovoltaic units in droop-controlled DC microgrids

2015 IEEE Energy Conversion Congress and Exposition (ECCE) Pub Date : 2015-10-29 DOI:10.1109/ECCE.2015.7310530

Panbao Wang, Xu Yang, Wei Wang, Guihua Liu, Dianguo Xu

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引用次数: 4

Abstract

Photovoltaic (PV) units in DC microgrids (MGs) usually have two operating modes including constant voltage control (CVC) mode and maximum power point tracking (MPPT) mode. When the operating mode of PV units switches between CVC and MPPT, unexpected transient problems of output voltage and current may occur. Droop control applied in DC-MGs can achieve load current sharing at the time when more than two voltage-source units are connected in parallel. This paper puts forward a seamless switching control strategy of PV units in DC-MGs based on droop control. The proposed control strategy consists of voltage-current inner loops, droop control loop, and MPPT module. In this paper, conventional control strategy of PV units in DC-MGs is introduced firstly, and then the droop characteristics of voltage-shifting are analyzed. A basic DC-MG system made up of PV unit, DC load and AC grid interface inverter is set up to validate the proposed control strategy. The MPPT performance of proposed control strategy is tested. Experimental results show that compared with the conventional control strategy, better transient characteristic is achieved by using the proposed seamless switching control strategy.

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直流微电网中光伏机组的无缝切换控制策略

直流微电网中的光伏发电机组通常有恒压控制(CVC)和最大功率点跟踪(MPPT)两种工作模式。当光伏机组运行模式在CVC和MPPT之间切换时，可能会出现意外的输出电压和电流的瞬态问题。当两个以上的电压源单元并联时，应用于直流mg的下垂控制可以实现负载电流分担。提出了一种基于下垂控制的直流电网光伏机组无缝切换控制策略。该控制策略由电压电流内环、下垂控制环和MPPT模块组成。本文首先介绍了直流电网中光伏机组的常规控制策略，然后分析了移压的下垂特性。建立了一个由光伏机组、直流负载和交流电网接口逆变器组成的基本DC- mg系统，验证了所提出的控制策略。对所提出的控制策略进行了MPPT性能测试。实验结果表明，与传统控制策略相比，所提出的无缝切换控制策略获得了更好的暂态特性。

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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2015 IEEE Energy Conversion Congress and Exposition (ECCE)

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