A Compensation Control Scheme of Voltage Unbalance Using a Combined Three-Phase Inverter in an Islanded Microgrid

Biying Ren, Xiangdong Sun, Shasha Chen and Huan Liu
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Biying Ren: Department of Electronical Engineering, Xi’an University of Technology, Xi’an 710048, China
Xiangdong Sun: Department of Electronical Engineering, Xi’an University of Technology, Xi’an 710048, China
Shasha Chen: Department of Electronical Engineering, Xi’an University of Technology, Xi’an 710048, China
Huan Liu: Department of Electronical Engineering, Xi’an University of Technology, Xi’an 710048, China

Energies, 2018, vol. 11, issue 9, 1-15

Abstract: A large number of single-phase loads in an islanded microgrid have a bad influence on the alternating current (AC) bus voltage symmetry, which will further impact the power supply for the other loads. In this paper, the combined three-phase inverter is adopted as the distributed generation (DG) interface circuit for its independent control of each bridge. However, the combined three-phase inverter will generate an asymmetrical voltage with the traditional droop control. Moreover, the system impedance also effects the voltage symmetry. Therefore, the improved droop control method based on the self-adjusting P - f and Q - U droop curves and the system impedance voltage drop compensation are proposed. The system control scheme is also designed in detail. A simulation and an experiment under the conditions of the balanced, unbalanced loads are carried out, and the results verify the feasibility and effectiveness of the control strategy.

Keywords: unbalanced loads; voltage symmetry; droop control; impedance voltage drop compensation; combined three-phase inverter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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