Open AccessDistributed secondary voltage control for autonomous microgrids under additive measurement noises and time delays
Author(s) -
Lai Jingang,
Lu Xiaoqing,
Monti Antonello
Publication year - 2019
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2018.5946
Subject(s) - microgrid , computer science , control theory (sociology) , controller (irrigation) , matlab , distributed generation , voltage , lyapunov function , graph , control (management) , graph theory , toolbox , control engineering , engineering , mathematics , renewable energy , artificial intelligence , physics , electrical engineering , theoretical computer science , nonlinear system , quantum mechanics , combinatorics , agronomy , biology , operating system , programming language
This study addresses the secondary voltage restoration problem of ac autonomous microgrids with additive measurement noises and time delays. Existing distributed control methods commonly assume ideal communication among distributed generators (DG), however, the channels are prone to additive noises (i.e. caused by environmental causes, such as rain etc.) and time delays, then each DG obtains noisy and delayed measurements of the states of its neighbouring DGs. The proposed distributed cooperative control strategy will achieve voltage restoration of DGs through a sparse communication network subject to noisy and delayed measurements. The theoretical concepts and necessary conditions for stability and robust performance of the proposed distributed secondary voltage control strategy are outlined by the graph theory, stochastic theory, and Lyapunov functional approach. Furthermore, the proposed control strategy is fully distributed and therefore the central controller is no longer required bringing about several advantages, e.g. plug‐and‐play property. Simulation results on an autonomous ac microgrid test system are obtained to evaluate the performance of the proposed control method to achieve voltage restoration in the MATLAB/SimPowerSystems Toolbox.