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Design of virtual inductance for droop-controlled inverter with seamless transition between islanded and grid-connected operations

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3 Author(s)
Shang-Hung Hu ; Dept. of Electr. Eng., Nat. Sun Yat-sen Univ., Kaohsiung, Taiwan ; Chun-Yi Kuo ; Tzung-Lin Lee

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.

Published in:

Energy Conversion Congress and Exposition (ECCE), 2012 IEEE

Date of Conference:

15-20 Sept. 2012

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