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http://dx.doi.org/10.6113/JPE.2017.17.6.1658

An Enhanced Instantaneous Circulating Current Control for Reactive Power and Harmonic Load Sharing in Islanded Microgrids  

Lorzadeh, Iman (Department of Electrical Engineering, Salman Farsi University of Kazerun)
Abyaneh, Hossein Askarian (Department of Electrical Engineering, Amirkabir University of Technology)
Savaghebi, Mehdi (Department of Energy Technology, Aalborg University)
Lorzadeh, Omid (Department of Electrical Engineering, Shiraz University)
Bakhshai, Alireza (Department of Electrical and Computer Engineering, Queens University)
Guerrero, Josep M. (Department of Energy Technology, Aalborg University)
Publication Information
Journal of Power Electronics / v.17, no.6, 2017 , pp. 1658-1671 More about this Journal
Abstract
To address the inaccurate load demand sharing problems among parallel inverter-interfaced voltage-controlled distributed generation (DG) units in islanded microgrids (MGs) with different DG power ratings and mismatched feeder impedances, an enhanced voltage control scheme based on the active compensation of circulating voltage drops is proposed in this paper. Using the proposed strategy, reactive power and harmonic currents are shared accurately and proportionally without knowledge of the feeder impedances. Since the proposed local controller consists of two well-separated fundamental and harmonic voltage control branches, the reactive power and harmonic currents can be independently shared without having a remarkable effect on the amplitude or quality of the DGs voltage, even if nonlinear (harmonic) loads are directly connected at the output terminals of the units. In addition, accurate load sharing can also be attained when the plug-and-play performance of DGs and various loading conditions are applied to MGs. The effects of communication failures and latency on the performance of the proposed strategy are also explored. The design process of the proposed control system is presented in detail and comprehensive simulation studies on a three-phase MG are provided to validate the effectiveness of the proposed control method.
Keywords
Circulating currents; Islanded MG; Reactive power and harmonic currents sharing; Voltage-controlled DG;
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