Fixed-order decentralized/distributed control of islanded inverter-interfaced microgrids
This paper focuses on the problem of voltage control of islanded inverter-interfaced microgrids consisting of several distributed generation (DG) units with radial structure. The main objectives are to (i) design a decentralized/distributed voltage controller with minimum information exchange between DG units and their local controllers (ii) design a fixed-/low-order dynamic output feedback controller which ensures stability as well as desired performance of the microgrid system in spite of load parameter uncertainties. To this end, the problem is formulated as an optimization problem which is the minimization of the cardinality of a pattern matrix subject to an H∞ performance constraint. Since the problem is intrinsically non-convex, a convex optimization-based design procedure for the controller synthesis is proposed in this paper. The effectiveness of the proposed controller is evaluated through simulation studies and Hardware-In-the-Loop (HIL) verifications. The simulation and experimental results demonstrate the effectiveness of the proposed control strategy.
Keywords: H-infinity control ; Distributed/decentralized control ; Control structure design ; Distributed/decentralized control ; Fixed-order controller ; Islanded inverter-interfaced microgrids ; Linear Matrix Inequality
Record created on 2015-11-03, modified on 2016-08-09