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access icon openaccess Hybrid adaptive framework for coordinated control of distributed generators in cyber-physical energy systems

This is an open access article published by the IET under the Creative Commons Attribution -NonCommercial License (http://creativecommons.org/licenses/by-nc/3.0/)
Received 21/06/2017, Accepted 29/11/2017, Revised 03/10/2017, Published 04/12/2017

With the development of information and communications technology (ICT) and inundation of sensing devices, the control of smart grid is undergoing a paradigm shift from centralised/decentralised to a more distributed nature allowing each distributed generator to receive information from sensors at distant buses. In such systems, there is much interdependency between various power, control and communication parameters due to which the control of parameters from one domain gets affected by other. The central idea of this study is to develop a generic, hybrid and customised framework to jointly model the multi-disciplinary variables and their interactions present in the smart grid and to develop controllers in an adaptive manner to ensure better control of physical variables such as voltage irrespective of the changes in operating point brought about by changes in physical/cyber parameters. Hence, the different operating conditions of the power system have been modelled as multiple subsystems of a hybrid switching system and controller design is carried out by solving the optimisation formulations developed for delay-free and delay-existent cases using the theory of common Lyapunov function. The optimisation is carried out using the block coordinate descent methodology by converting the non-convex formulation into a series of convex problems to obtain a solution.

Inspec keywords: distributed power generation; smart power grids; concave programming; convex programming; Lyapunov methods

Other keywords: distributed generators; coordinated control; convex problems; smart grid; Lyapunov function; hybrid adaptive framework; cyber-physical energy systems; delay-free cases; block coordinate descent methodology; ICT technology; delay-existent cases; non-convex formulation; hybrid switching system and controller design; optimisation formulations

Subjects: Stability in control theory; Control of electric power systems; Distributed power generation; Optimisation techniques; Optimisation techniques

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