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Energies 2016, 9(11), 978; doi:10.3390/en9110978

Improved Direct Deadbeat Voltage Control with an Actively Damped Inductor-Capacitor Plant Model in an Islanded AC Microgrid

1
Department of Electrical Engineering, Chosun University, 309, Pilmun-daero, Dong-gu, Gwangju 61452, Korea
2
Precision Control Research Center, Korea Electrotechnology Research Institute (KERI), 12, Bulmosan-ro 10beon-gil, Seongsan-gu, Changwon-si, Gyeongsangnam-do 51543, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Chunhua Liu
Received: 7 October 2016 / Revised: 13 November 2016 / Accepted: 14 November 2016 / Published: 22 November 2016
(This article belongs to the Collection Smart Grid)
View Full-Text   |   Download PDF [710 KB, uploaded 22 November 2016]   |  

Abstract

A direct deadbeat voltage control design method for inverter-based microgrid applications is proposed in this paper. When the inductor-capacitor (LC) filter output voltage is directly controlled using voltage source inverters (VSIs), the plant dynamics exhibit second-order resonant characteristics with a load current disturbance. To effectively damp the resonance caused by the output LC filter, an active damping strategy that does not cause additional energy loss is utilized. The proposed direct deadbeat voltage control law is devised from a detailed, actively damped LC plant model. The proposed deadbeat control method enhances voltage control performance owing to its better disturbance rejection capability than the conventional deadbeat or proportional-integral-based control methods. The most important advantage of the proposed deadbeat control method is that it makes the deadbeat control more robust by bringing discrete closed-loop poles closer to the origin. Simulation and experimental results are shown to verify the enhanced voltage control performance and stability of the proposed voltage control method. View Full-Text
Keywords: distributed generators (DGs); deadbeat control; inverters; microgrid; uninterruptible power supply (UPS) distributed generators (DGs); deadbeat control; inverters; microgrid; uninterruptible power supply (UPS)
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Kim, J.; Hong, J.; Kim, H. Improved Direct Deadbeat Voltage Control with an Actively Damped Inductor-Capacitor Plant Model in an Islanded AC Microgrid. Energies 2016, 9, 978.

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