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access icon openaccess Hierarchical control of parallel voltage source inverters in AC microgrids

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 24/08/2018, Accepted 04/10/2018, Published 23/10/2018

Here, a distributed hierarchical control strategy is proposed for the parallel operating of voltage source inverters (VSIs) in AC microgrids (MGs). For the output voltage control of a VSI, conventional double-loop proportional-integral (PI) control method has deteriorative performance under disturbance parameters conditions and has a narrow range of stable operation. Here, the sliding mode control (SMC)-based inner-loop current control (level0) and mixed H 2/H ∞-based outer-loop voltage control (level1) are proposed for the output voltage control of a VSI, which combines the advantages of robustness and fast transient response. The droop control (level2) is applied to avoid circulating currents among the VSIs without using any critical communication between them. The multi-agent system (MAS)-based distributed economic automatic generation control (EAGC) and distributed automatic voltage control (AVC) (level3) are proposed to restore the voltage magnitude and frequency deviations caused by droop controller and achieve optimal active power dispatch at the same time.

Inspec keywords: H∞ control; hierarchical systems; invertors; distributed power generation; multi-agent systems; voltage control; voltage-source convertors; variable structure systems; transient response; electric current control; control system synthesis; distributed control; H2 control; power generation control; PI control

Other keywords: optimal active power dispatch; fast transient response; VSIs; MAS-based EAGC; frequency deviations; double-loop proportional-integral control method; AC microgrids; mixed H2-H∞-based outer-loop voltage control; droop controller; distributed hierarchical control strategy; multiagent system-based distributed economic automatic generation control; circulating current avoidance; parallel voltage source inverters; voltage magnitude; sliding mode control-based inner-loop current control; distributed automatic voltage control

Subjects: Distributed power generation; Current control; Optimisation techniques; Power system control; Control of electric power systems; Multivariable control systems; Optimal control; DC-AC power convertors (invertors); Voltage control; Control system analysis and synthesis methods

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