Title :
A grid-interfacing power quality compensator for three-phase three-wire microgrid applications
Author :
Li, Y.W. ; Vilathgamuwa, D.M. ; Loh, P.C.
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore
Abstract :
This paper proposes a grid-interfacing power quality compensator for three-phase three-wire microgrid applications with consideration of both the power quality of the microgrid and the quality of currents flowing between the microgrid and utility system. It is proposed that two inverters (a shunt and a series) are used for each distributed generation (DG) system in the microgrid. For each inverter, both positive-and negative-sequence components are controlled to compensate for the effects caused by the unbalanced utility grid voltages. Specifically, the shunt inverter is controlled to ensure balanced voltages within the microgrid and to regulate power dispatches among parallel-connected DG systems, while the series inverter balances the line currents by injecting appropriate voltage components. A current-limiting algorithm is also proposed and integrated within the inverter control schemes to protect the microgrid from large fault currents during utility voltage sags (balanced or unbalanced). The proposed compensator has been tested in simulations and experimentally using a laboratory hardware prototype.
Keywords :
compensation; distributed power generation; fault currents; invertors; power control; power engineering computing; power generation dispatch; power supply quality; current-limiting algorithm; currents flowing quality; distributed generation system; fault currents; grid-interfacing power quality compensator; inverter control schemes; negative-sequence component; positive sequence component; power dispatches; shunt inverter; three-phase three-wire microgrid; utility grid voltages; utility system; voltage sags; Control systems; Distributed control; Fault currents; Hardware; Inverters; Laboratories; Power quality; Power system protection; Testing; Voltage control;
Conference_Titel :
Power Electronics Specialists Conference, 2004. PESC 04. 2004 IEEE 35th Annual
Print_ISBN :
0-7803-8399-0
DOI :
10.1109/PESC.2004.1355426