Title :
The control strategy of grid-connected converters in microgrids with unbalanced load
Author :
Li, Mingjuan ; Lin, Fei ; Hao, Ruixiang ; You, Xiaojie ; Zheng, Trillion Q.
Author_Institution :
Sch. of Electr. Eng., Beijing Jiaotong Univ., Beijing, China
Abstract :
A multi-loop controller for grid-connected voltage source converters with LCL filter is proposed in this paper. The controller consists of three segments - inner predictive current controller, outer voltage vector controller, and the command voltage modifier. The whole controller is applied to converters based DRs in microgrids, and regulate the load terminal voltage with zero steady-state error even under unbalanced conditions. Selected results from simulation studies conducted on the performance of the controller under balanced and unbalanced conditions both in island and grid-connected mode are presented.
Keywords :
electric current control; load regulation; power convertors; power system control; voltage control; LCL filter; command voltage modifier; control strategy; grid connected converter; grid-connected voltage source converter; load terminal voltage; microgrids; multiloop controller; predictive current controller; unbalanced load; voltage vector controller; Circuit simulation; Control systems; Converters; Error correction; Filters; Photovoltaic systems; Power conversion; Pulse width modulation; Steady-state; Voltage control; converters; mirogrids; multi-loop controller; unbalanced condition;
Conference_Titel :
Industrial Electronics and Applications, 2009. ICIEA 2009. 4th IEEE Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4244-2799-4
Electronic_ISBN :
978-1-4244-2800-7
DOI :
10.1109/ICIEA.2009.5138194
