Title: Robust load frequency control for uncertain nonlinear interconnected power systems

Authors: Jianping Guo; Lili Dong

Addresses: Department of Electrical Engineering and Computer Science, Cleveland State University, 2121 Euclid Ave., Cleveland, OH 44115, USA ' Department of Electrical Engineering and Computer Science, Cleveland State University, 2121 Euclid Ave., Cleveland, OH 44115, USA

Abstract: A robust load frequency controller is applied to a nonlinear three-area interconnected power system where non-reheat, reheat, and hydraulic turbines are distributed in different areas respectively. The nonlinearities such as governor dead band and generation rate constraint are included in the block diagram model of the power plant. A sliding mode controller (SMC) is developed to regulate frequency error and tie-line power error of the power system despite the presences of load changes and parameter variations. The SMC is simulated on the nonlinear and three-area interconnected power system. The simulation results demonstrate the robustness of the control system against external disturbance and system uncertainties. They also show that the SMC successfully drives the frequency error and tie-line power error to zero.

Keywords: load frequency control; sliding mode control; SMC; governor dead band; GDB; generation rate constraint; GRC; robust control; frequency error; tie-line power error; reheat turbines; non-reheat turbines; hydraulic turbines; uncertainty; nonlinear systems; interconnected power systems; controller design; simulation.

DOI: 10.1504/IJAAC.2017.084847

International Journal of Automation and Control, 2017 Vol.11 No.3, pp.239 - 261

Received: 17 Jul 2015
Accepted: 25 Jan 2016

Published online: 24 Mar 2017 *

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