An approach to improve dynamic response of VSIs in off-grid Microgrids

Author

Kohansal, Mahdi ; Moghani, Javad S. ; Rahmatian, Matin ; Gharehpetian, Gevorg B.

Author_Institution

Electr. Eng. Dept., Amirkabir Univ. of Technol., Tehran, Iran

fYear

2011

fDate

27-29 Dec. 2011

Firstpage

542

Lastpage

546

Abstract

Recently, voltage source inverters have been applied in a wide range in order to stabilize Microgrids (MGs). These inverters are controlled based on conventional droop method. This method satisfies power sharing between the inverters in steady state. Besides, it enrolls as the frequency controller in inverter-based systems such as MG. In this paper, a modified droop controller is proposed to improve the response speed of VSI during transient time while the power sharing between them is kept satisfied in steady state. This improvement is very useful to stabilize the frequency of independent MG after events leading to power imbalance. The effectiveness of the proposed method is validated after comparison with the conventional droop method through simulations.

Keywords

distributed power generation; dynamic response; frequency control; invertors; stability; MG; VSI; dynamic response improvement; frequency controller; modified droop controller; offgrid microgrids; power imbalance; power sharing; steady state; transient time; voltage source inverters; Frequency control; Impedance; Inverters; Reactive power; Steady-state; Transient analysis; Circulating current; Conventional droop method; Distributed generation; Microgrid; Parallel inverters; VSI;

fLanguage

English

Publisher

ieee

Conference_Titel

Control, Instrumentation and Automation (ICCIA), 2011 2nd International Conference on

Conference_Location

Shiraz

Print_ISBN

978-1-4673-1689-7

Type

conf

DOI

10.1109/ICCIAutom.2011.6356716

Filename

6356716