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Voltage and frequency synchronization of a low voltage inverter based microgrid
, B. Subudhi, S. Das
Published in Institute of Electrical and Electronics Engineers Inc.
2017
Volume: 2017-January
   
Pages: 1 - 6
Abstract
Motivated by the distributed control strategy of a multi-agent system, this paper presents a distributed voltage and frequency synchronization schemes for an AC microgrid (MG). For a low voltage MG, the line impedance between the distributed generator (DG) units are predominantly resistive, therefore the existing droop control approach i.e. P - w and Q - v droop yields transients and poor stability. In view of improving the transient response and stability, a new resistive droop control approach is proposed this paper. Here, the considered MG test system is a low voltage MG that operates in islanded mode. Three control loops namely power, voltage and current control of a DG are analyzed under a special case of resistive low voltage MG. The proposed control scheme is implemented locally at each DG terminal. Besides this, secondary distributed cooperative control is used to regulate the voltage and frequency deviations caused by the primary droop control. The effectiveness of the proposed voltage and frequency synchronization scheme is verified by creating a simulation setup considering a 4-bus MG test system using MATLAB/Simulink. The results obtained envisage that the proposed scheme is restoring the voltage and frequency in a short time duration. © 2017 IEEE.