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Energies 2018, 11(10), 2688;

Improved Voltage Unbalance and Harmonics Compensation Control Strategy for an Isolated Microgrid

College of Engineering and Science, Victoria University, Melbourne 3047, Australia
Department of Electrical Engineering, Tafresh University, Tafresh 39518-79611, Iran
Institute of High Voltage & High Current Faculty of Electrical Engineering Universiti Teknologi Malaysia, Johor 81300, Malaysia
Research Group MOBI—Mobility, Logistics, and Automotive Technology Research Center, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
Flanders Make, 3001 Heverlee, Belgium
Electrical Engineering Department, Faculty of Engineering, Arak University, Arak 3815688349, Iran
Authors to whom correspondence should be addressed.
Received: 9 September 2018 / Revised: 29 September 2018 / Accepted: 7 October 2018 / Published: 9 October 2018
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This paper suggests an enhanced control scheme for a four-leg battery energy storage systems (BESS) under unbalanced and nonlinear load conditions operating in the isolated microgrid. Simplicity, tiny steady-state error, fast transient response, and low total harmonic distortion (THD) are the main advantages of the method. Firstly, a new decoupled per-phase model for the three-phase four-leg inverter is presented. It can eliminate the effect of power stage coupling on control design; thus, the three-phase four-leg power inverter can be viewed as three single input single output (SISO) control systems. Then, using an improved orthogonal signal generation method, the per-phase model of the four-leg inverter in the stationary and synchronous frame is derived. As the second step, a per-phase multi-loop control scheme for the four-leg inverter under unbalanced load conditions is suggested. The proposed control strategy has the ability to provide balanced output voltages under unbalanced load conditions by avoiding the need to deal with the symmetrical components. Finally, a multi-resonant harmonic compensator is used to actively prevent low-order harmonic currents to distort the output voltages of the three-phase four-leg grid-forming power converter. Simulations results are also presented to verify the performance of the suggested control strategy. View Full-Text
Keywords: voltage unbalance; harmonics compensation; control strategy; battery energy storage systems voltage unbalance; harmonics compensation; control strategy; battery energy storage systems

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Hadidian Moghaddam, M.J.; Kalam, A.; Miveh, M.R.; Naderipour, A.; Gandoman, F.H.; Ghadimi, A.A.; Abdul-Malek, Z. Improved Voltage Unbalance and Harmonics Compensation Control Strategy for an Isolated Microgrid. Energies 2018, 11, 2688.

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