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Load sharing and power quality enhanced operation of a distributed microgrid

Majumder, Ritwik, Ghosh, Arindam, Ledwich, Gerard, & Zare, Firuz (2009) Load sharing and power quality enhanced operation of a distributed microgrid. I. E. T. Renewable Power Generation, 3(2), pp. 109-119.

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Abstract

This paper describes control methods for proper load sharing between parallel converters connected in a microgrid and supplied by distributed generators (DGs). It is assumed that the microgrid spans a large area and it supplies loads in both in grid connected and islanded modes. A control strategy is proposed to improve power quality and proper load sharing in both islanded and grid connected modes. It is assumed that each of the DGs has a local load connected to it which can be unbalanced and/or nonlinear. The DGs compensate the effects of unbalance and nonlinearity of the local loads. Common loads are also connected to the microgrid, which are supplied by the utility grid under normal conditions. However during islanding, each of the DGs supplies its local load and shares the common load through droop characteristics. Both impedance and motor loads are considered to verify the system response. The efficacy of the controller has been validated through simulation for various operating conditions using PSCAD. It has been found through simulation that the total Harmonic Distortion (THD) of the of the microgrid voltage is about 10% and the negative and zero sequence component are around 20% of the positive sequence component before compensation. After compensation, the THD remain below 0.5%, whereas, negative and zero sequence components of the voltages remain below 0.02% of the positive sequence component.

Impact and interest:

70 citations in Scopus
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43 citations in Web of Science®

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ID Code: 31222
Item Type: Journal Article
DOI: 10.1049/iet-rpg:20080001
ISSN: 1752-1416
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Renewable Power and Energy Systems Engineering (excl. Solar Cells) (090608)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2009 The Institution of Engineering and Technology
Deposited On: 09 Mar 2010 09:39
Last Modified: 01 Mar 2012 00:02

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