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Title: Improved P-f/Q-V and P-V/Q-f droop controllers for parallel distributed generation inverters in AC microgrid
Authors: Raj, D, C.
Gaonkar, D.N.
Guerrero, J.M.
Issue Date: 2018
Citation: Sustainable Cities and Society, 2018, Vol.41, , pp.421-442
Abstract: Distributed generation inverters are generally operated in parallel with P-f/Q-V and P-V/Q-f droop control strategies. Due to mismatched resistive and inductive line impedance, power sharing and output voltage of the parallel DG inverters deviate from the reference value. This leads to instability in the microgrid system. Adding virtual resistors and virtual inductors in the control loop of droop controllers improve the power sharing and stability of operation. But, this leads to voltage drop. Therefore, an improved P-f/Q-V and P-V/Q-f droop control is proposed. Simulation results demonstrate that the proposed control and the selection of parameters enhance the output voltage of inverters. 2018 Elsevier Ltd
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