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Abstract
Abstract—This article proposes a method that enables ideal sharing of reactive power among converter-based micro-sources in a microgrid with a decentralized control strategy. Power sharing must be properly performed among micro-sources to avoid circulating currents or overloading. Using conventional droop characteristics to achieve power sharing is not satisfactory, as system asymmetry will greatly impact the quality of sharing. In the proposed method, droop characteristic parameters are modified upon a change in system operating point such that ideal sharing takes place after the modification process. Simulation results are presented to show the validity of analysis.
NOMENCLATURE
| DG | = | distributed generation |
| DR | = | distributed resource |
| id,iq | = | d- and q-axis components of injecting current to microgrid |
| kp, ki | = | proportional-integral (PI) controller parameters |
| MG | = | microgrid |
| mp | = | P-ω droop characteristic slope |
| MS | = | micro-source |
| nq | = | Q-V droop characteristic slope |
| P | = | micro-source average active power |
| PI | = | proportional-integral |
| PIS | = | active power in the case of ideal sharing (per unit) |
| Pn | = | micro-source rated active power |
| Q | = | micro-source average reactive power |
| QIS | = | reactive power in the case of ideal sharing (per unit) |
| Qn | = | micro-source rated reactive power |
| V | = | micro-source output terminal voltage |
| V0 | = | microgrid nominal voltage |
| vd, vq | = | d- and q-axis components of micro-source terminal voltage |
| α, β | = | parameters of ω-based droop characteristic during modification process |
| ω | = | micro-source frequency |
| ω0 | = | microgrid nominal frequency |
Additional information
Notes on contributors
Hadi Saghafi
Hadi Saghafi was born in Isfahan, Iran, in 1982. He studied at Isfahan University of Technology, receiving his B.Sc. in 2004 and his M.Sc. in 2007 in power engineering. He is currently working toward his PhD at the same university. His research interests include microgrids, distributed generation, pulse-width modulation (PWM) techniques, multi-pulse inverters, and other fields of power electronics.
Hamid Reza Karshenas
Hamid Reza Karshenas was born in Isfahan, Iran, in 1964. He received his B.Sc. in electrical engineering from Isfahan University of Technology, Isfahan, Iran, in 1987; his M.Sc. from Sharif University of Technology, Tehran, in 1990; and his Ph.D. from University of Toronto, Toronto, ON, Canada, in 1997. Since 1997, he has been with the Department of Electrical and Computer Engineering, Isfahan University of Technology, where he is an associate professor. His research interests include control in power electronics, application of power electronics in power systems, harmonics in power systems, and distributed generation.