access icon free Decentralised robust T-S fuzzy controller for a parallel islanded AC microgrid

This study proposes a decentralised robust fuzzy control strategy for islanded operation of an AC microgrid with voltage source inverters. The objective is to design a robust controller for regulating the load voltage and sharing power among distributed generators (DGs) in the presence of uncertainties in the system and non-linear loads. The AC microgrid consists of parallel DGs connected to a main AC bus. A Takagi-Sugeno fuzzy approach is developed in this article to achieve stability and desired performance in dealing with non-linearities in the islanded microgrid and H criterion is used to obtain a robust control strategy in presence of uncertainties raised by unmodelled and high frequency dynamics. Therefore, a non-convex condition in H optimisation problem is converted to a convex linear matrix inequality (LMI) condition and is solved by MATLAB LMI toolbox. In order to develop a decentralized system, Pf and QV droop controllers are used to specify set-points for local inverter controllers in each DG. The effectiveness of the proposed control strategy in presence of constant power load and DG accidental outage is validated by the simulation of a microgrid test system in MATLAB SimPowerSystems toolbox. Comparison with cascaded proportional integral controller shows advantages of robust T-S controller.

Inspec keywords: robust control; nonlinear control systems; fuzzy control; decentralised control; power distribution faults; linear matrix inequalities; distributed power generation; voltage control; control system synthesis; invertors; power generation control

Other keywords: parallel islanded AC microgrid; convex linear matrix inequality; constant power load; nonconvex condition; decentralised system; islanded operation; LMI condition; decentralised robust fuzzy control strategy; local inverter controllers; Takagi–Sugeno fuzzy approach; voltage source inverters; robust control strategy; parallel DGs; distributed generators; robust controller; load bus voltage; MATLAB LMI toolbox; convex linear matrix inequality condition; T-S controller; AC bus; MATLAB SimPowerSystems toolbox; microgrid test system; droop controllers; high frequency dynamics; decentralised robust T-S fuzzy controller

Subjects: Distributed power generation; Distribution networks; Fuzzy control; Algebra; Voltage control; Multivariable control systems; Control system analysis and synthesis methods; Algebra; Stability in control theory; Nonlinear control systems; Control of electric power systems; Power system control

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-gtd.2018.5757
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