Title :
Design of virtual inductance for droop-controlled inverter with seamless transition between islanded and grid-connected operations
Author :
Hu, Shang-Hung ; Kuo, Chun-Yi ; Lee, Tzung-Lin
Author_Institution :
Dept. of Electr. Eng., Nat. Sun Yat-sen Univ., Kaohsiung, Taiwan
Abstract :
A seamless transition method has been presented for a droop-controlled inverter to transfer between islanded and grid-connected operations. A so-called virtual inductance and local phase-locked-loop (PLL) were proposed to realize this transition with no grid synchronization. This paper presents designing of variable virtual inductance to suppress inrush current, including exponentially-decaying, ramp-decaying, and constant virtual inductances. In addition, phase error of the PLL and the transient of the droop control are included. Simulations and preliminary experiments are provided.
Keywords :
distributed power generation; invertors; phase locked loops; power grids; PLL; droop-controlled inverter; exponential-decay; grid synchronization; grid-connected operation; inrush current suppression; islanded operation; phase error; phase-locked-loop; ramp-decay; seamless transition method; variable virtual inductance design; Delay; Inductance; Inverters; Phase locked loops; Surges; Switches; Voltage control;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2012 IEEE
Conference_Location :
Raleigh, NC
Print_ISBN :
978-1-4673-0802-1
Electronic_ISBN :
978-1-4673-0801-4
DOI :
10.1109/ECCE.2012.6342226
