TY - GEN

T1 - Power-sharing based on open-loop synchronization of inverters in an islanded AC microgrid

AU - Sahoo, Animesh

AU - Thattai, Kuthsav

AU - Ravishankar, Jayashri

AU - Ciobotaru, Mihai

PY - 2018

Y1 - 2018

N2 - Accurate and fast estimation of magnitude, frequency, and phase of the grid voltage is an essential part of the synchronization process and power-sharing control among parallel connected inverter-based AC microgrids, while running in islanded mode. Synchronization can be done using both open-loop and closed-loop estimation techniques. The conventional closed-loop synchronization technique used is Synchronous Reference Frame based Phase Locked Loop (SRF-PLL), estimates the phase angle of the grid voltage with a typical settling time of one or multiple fundamental periods. Moreover, the SRF-PLL estimates both, the frequency and phase angle of the voltage in one single loop, thus a jump in the phase angle affects the frequency estimation, which will have a negative impact on the power sharing control. To overcome these issues, this paper proposes an open loop synchronization technique based on Teager-Kaiser Energy Operator (TKEO) and Cross Energy Operator (TKCEO) to estimate the grid voltage frequency and phase angle, respectively. Presented results show that the power-sharing with energy operator based calculations gives a better response when compared to classical SRF-PLL.

AB - Accurate and fast estimation of magnitude, frequency, and phase of the grid voltage is an essential part of the synchronization process and power-sharing control among parallel connected inverter-based AC microgrids, while running in islanded mode. Synchronization can be done using both open-loop and closed-loop estimation techniques. The conventional closed-loop synchronization technique used is Synchronous Reference Frame based Phase Locked Loop (SRF-PLL), estimates the phase angle of the grid voltage with a typical settling time of one or multiple fundamental periods. Moreover, the SRF-PLL estimates both, the frequency and phase angle of the voltage in one single loop, thus a jump in the phase angle affects the frequency estimation, which will have a negative impact on the power sharing control. To overcome these issues, this paper proposes an open loop synchronization technique based on Teager-Kaiser Energy Operator (TKEO) and Cross Energy Operator (TKCEO) to estimate the grid voltage frequency and phase angle, respectively. Presented results show that the power-sharing with energy operator based calculations gives a better response when compared to classical SRF-PLL.

KW - AC Microgrid

KW - Phase-locked Loop

KW - VSI

KW - Energy Operator

KW - Power-sharing

UR - http://www.scopus.com/inward/record.url?scp=85061529483&partnerID=8YFLogxK

U2 - 10.1109/IECON.2018.8591713

DO - 10.1109/IECON.2018.8591713

M3 - Conference proceeding contribution

AN - SCOPUS:85061529483

SN - 9781509066858

SP - 237

EP - 242

BT - Proceedings

PB - Institute of Electrical and Electronics Engineers (IEEE)

CY - Piscataway, NJ

T2 - 44th Annual Conference of the IEEE Industrial Electronics Society, IECON 2018

Y2 - 20 October 2018 through 23 October 2018

ER -