Distributed Finite-Time Secondary Frequency and Voltage Restoration Control Scheme of an Islanded AC Microgrid

Junjie Ma, Xudong Wang, Siyan Zhang and Hanying Gao
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Junjie Ma: School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China
Xudong Wang: School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China
Siyan Zhang: School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China
Hanying Gao: School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China

Energies, 2021, vol. 14, issue 19, 1-20

Abstract: To solve the problems of frequency and voltage deviation caused by the droop control while meeting the requirements of rapid response, a distributed finite-time secondary control scheme is presented. Unlike the traditional cooperative controllers, this scheme is fully distributed; each unit only needs to communicate with its immediate neighbors. A control protocol for frequency restoration and active power sharing is proposed to synchronize the frequency of each unit to the reference value, and achieve accurate active power distribution in a finite-time manner as well. The mismatch of the line impedance is considered, and a consensus-based adaptive virtual impedance control is proposed. The associated voltage drop is considered to be the compensator for the voltage regulation. Then, a distributed finite-time protocol for voltage restoration is designed. The finite-time convergence property and the upper bound of convergence times are guaranteed with rigorous Lyapunov proofs. Case studies in MATLAB are carried out, and the results demonstrate the effectiveness, the robustness to load changes, plug-and play capacity, and better convergence performance of the proposed control scheme.

Keywords: finite-time control; frequency and voltage restoration; reactive power sharing; adaptive virtual impedance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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