Title: Stability enhancement with SSSC-based controller design in presence of non-linear voltage-dependent load

Authors: Sangram Keshori Mohapatra; Sidhartha Panda

Addresses: Department of Electrical Engineering, C.V. Raman College of Engineering, Bhubaneswar-752054, Odisha, India ' Department of Electrical Engineering, Veer Surendra Sai University of Technology, Burla-768018, Odisha, India

Abstract: The main objective of this paper is to investigate the power system stability improvement by tuning of static synchronous series compensator (SSSC)-based controllers in presence of non-linear voltage-dependent loads. Modern heuristic optimisation techniques such as the gravitational search algorithm (GSA), particle swarm optimisation and differential evolution algorithm are employed for the purposed system to find out the optimal controller parameters. The performance of these optimisation techniques have been compared and analysed. The performance of the designed controllers has been evaluated under different disturbances and load parameters for both single and multi-machine power system. The effectiveness and robustness of the proposed controller are verified by changing the load parameters of voltage-dependent loads and type of disturbance. It is observed that when constant impedance load is considered in the proposed test systems, the stability of the power system is better when compared with that with constant power and constant current loads.

Keywords: GSA; gravitational search algorithm; particle swarm optimisation; PSO; differential evolution; power system stability; SSSC; static synchronous series compensator; multi-machine power systems; stability enhancement; controller design; nonlinear loads; voltage-dependent loads; impedance load; power loads; current loads.

DOI: 10.1504/IJISTA.2016.076499

International Journal of Intelligent Systems Technologies and Applications, 2016 Vol.15 No.2, pp.163 - 187

Received: 26 Mar 2015
Accepted: 12 Jan 2016
Published online: 10 May 2016 *

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