Title: Design of an automatic voltage regulator based on symmetric root locus technique

Authors: Rittu Angu; R.K. Mehta

Addresses: Department of Electrical Engineering, North Eastern Regional Institute of Science and Technology (NERIST), Nirjuli 791109, Arunachal Pradesh, India ' Department of Electrical Engineering, North Eastern Regional Institute of Science and Technology (NERIST), Nirjuli 791109, Arunachal Pradesh, India

Abstract: An automatic voltage regulator (AVR) design based on symmetric root locus (SRL) technique for a synchronous machine infinite bus (SMIB) power system is presented. The SRL technique is used to minimise the amplifier saturation by placing the closed-loop poles (CLPs) of the system at desired locations. The desired CLPs are decided by considering the dominant pole locations that provide maximum damping on the SRL plot. The design incorporates an extended estimator to deal with uncertainties introduced due to variations of parameters or operating conditions. They reconstruct the state information including the state of disturbance dynamics simultaneous to implement full state feedback and using the reconstructed disturbance estimate to compensate the effect of external disturbance or parameter uncertainties. The performance of the system is analysed through simulating at different operating conditions. The control method improves the tracking response and provides zero estimation error in the steady-state. Illustrative examples have been provided to demonstrate the effectiveness of the developed methodology.

Keywords: synchronous machine infinite bus; SMIB; automatic voltage regulator; AVR; symmetric root locus; SRL; extended estimator.

DOI: 10.1504/IJSCC.2019.102742

International Journal of Systems, Control and Communications, 2019 Vol.10 No.4, pp.317 - 328

Accepted: 15 Jan 2019
Published online: 02 Oct 2019 *

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