IJE TRANSACTIONS A: Basics Vol. 32, No. 1 (January 2019) 75-83    Article in Press

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A. S. TUMMALA and R. P V
( Received: June 15, 2018 – Accepted: October 26, 2018 )

Abstract    The adverse effects of penetration of renewable energy systems on the power systems have already been experienced as they create wide frequency fluctuations due to their stochastic nature, adding to the load and parameter variations. This necessitated the regulation of frequency using robust controllers. In this paper, a composite sliding mode control is proposed to regulate the load frequency. This proposed scheme is a combination of a Finite time disturbance observer (FTDO) and a sliding mode controller. A novel sliding surface which is a function of system states and estimated disturbances is designed. The higher order disturbances like load disturbances, wind energy fluctuations and parameter variations are estimated and compensated through the control law. This concept is tested on Single-area and Three-area power systems for different operating conditions. The simulation results show the robustness and efficacy of the proposed method.


Keywords    Load Frequency Control, Sliding mode control, Power system control, AGC


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