NDLI: Decentralised power sharing control strategy in LV microgrids under unbalanced load conditions

Content Provider	IET Digital Library
Author	Alizadeh, Ebrahim Birjandi, Aliakbar Motie Hamzeh, Mohsen
Abstract	In this paper, a decentralized control strategy for inverter-based distributed generation (DG) is proposed to enhance the accuracy of power sharing under unbalanced load conditions in low-voltage microgrids. The proposed method includes two important saliences: (1) accurate unbalanced current injection from DGs, and (2) reduction of circulating real and reactive powers in an islanded microgrid. The features are complied with the proposed droop strategy utilized in the control system of each phase of DG converters. Based on the proposed triple-droop control strategy, the real power sharing in an AC low-voltage microgrid is significantly improved via P–V control strategy and the reactive power sharing accuracy is enhanced via Q–f control strategy. By this method, the amplitude of the output voltage of each phase of the converters is determined based on the amount of load connected to that phase. In addition, the efficiency of the microgrid is increased due to the circulating current reduction between DGs. A virtual impedance concept is also utilized to improve the accuracy of the proposed power sharing method. The feasibility and effectiveness of the proposed strategy are validated using MATLAB/SIMULINK software for International Council for Large Electric Systems (CIGRE) low-voltage distribution network benchmark.
Starting Page	1613
Ending Page	1623
Page Count	11
ISSN	17518687
Volume Number	11
e-ISSN	17518695
Issue Number	Issue 7, May (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/11/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2016.0248
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-01-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC LV Microgrid Circulating Current Reduction Circulating Real Power Reduction Control of Electric Power System Decentralised Control Decentralised Power Sharing Control Strategy DG Converter Phase Control System DG Units Distributed Power Generation Inverter-based Distributed Generation Invertors Islanded Microgrid Large Electric System LV Distribution Network Benchmark Low-voltage Microgrid MATLAB-Simulink Software Multivariable Control System Output Voltage Amplitude P-V Control Strategy Power And Energy Control Power Generation Control Power System Control Q-f Control Strategy Reactive Power Control Reactive-power Reduction Reactive-power Sharing Accuracy Triple-droop-control Strategy Unbalanced Current Injection Unbalanced Load Condition Virtual Impedance Concept Voltage Control
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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