DocumentCode :
648275
Title :
Improved droop control of isolated microgrid with virtual impedance
Author :
Haoming Liu ; Yi Chen ; Shanshan Li ; Yunhe Hou
Author_Institution :
Coll. of Energy & Electr. Eng., Hohai Univ., Nanjing, China
fYear :
2013
fDate :
21-25 July 2013
Firstpage :
1
Lastpage :
5
Abstract :
Droop control is one of the widely used control methods in power systems to deal with the power allocation among all rotary generators. In a microgrid, due to the resistive lines, the characteristic of P-f and Q-V may not be fully decoupled. As a result, the droop control cannot be implemented completely. By modifying the parameters of an inverter controller, the inductive equivalent output impedance can be obtained. However, it cannot meet the requirement of Q-V based control. In this paper, a concept entitled `virtual impedance´ is introduced to implement the droop control for microgrids. By this method, the equivalent impedance of the inverter, as well as the total equivalent impedance of the system, is with the inductive characteristic, which meets the requirements for implementation of P-f and Q-V control strategies. The proposed method is compared with the traditional strategy with PSCAD/EMTDC. The simulation results show that the proposed method can allocate both real and reactive powers effectively.
Keywords :
distributed power generation; electric impedance; electric potential; invertors; power generation control; reactive power control; turbogenerators; voltage control; P-f control strategy; Q-V control strategy; droop control; inductive characteristic; inductive equivalent output impedance; inverter controller; isolated microgrid; power system control; reactive power allocation; resistive line; rotary generator; virtual impedance; Impedance; Inverters; Microgrids; Pulse width modulation; Reactive power; Resistance; Voltage control; Droop control; inverters; microgrid; peer-to-peer control; virtual reactance;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power and Energy Society General Meeting (PES), 2013 IEEE
Conference_Location :
Vancouver, BC
ISSN :
1944-9925
Type :
conf
DOI :
10.1109/PESMG.2013.6672849
Filename :
6672849
Link To Document :
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