Voltage Imbalance Compensation for Droop-Controlled Inverters in Islanded Microgrid

Document Type: Research Paper

Authors

1 Department of Electrical and Electronics Engineering, Islamic Azad university, Gonabad Branch,Gonabad, Iran

2 Department of Electrical and Computer Engineering, University of Birjand, Birjand, Iran

3 Department of Electrical and Computer Engineering, Abbaspour College, Shahid Beheshti University, Tehran, Iran

Abstract

In this paper, a new control strategy is proposed for implementation in low-voltage microgrids with balanced/ unbalanced load circumstances. The proposed scheme contains, the power droop controllers, inner voltage and current loops, the virtual impedance loop, the voltage imbalance compensation. The proposed strategy balances the voltage of the single-phase critical loads by compensating the imbalanced voltage drop on the feeders. In addition, this strategy has also shown to be capable of restoring critical loads’ voltage to nominal values. This method also shares the real and reactive load accurately between DG units, based on their capacity. The simulation results in MATLAB /SIMULINK environment show the efficiency of the proposed approach in improving power sharing among DG units and decreasing voltage imbalance

Keywords