Simulation Study of a Monopole HVDC Transmission System Feeding a Very Weak AC Network with Firefly Algorithm Based Optimal PI Controller
S. Singaravelu1, S. Seenivasan2
1S. Singaravelu, Department of Electrical Engineering, Annamalai University, Annamalainagar, (Tamil Nadu), India.
2S. Seenivasan, Department of Electrical Engineering, Annamalai University, Annamalainagar, (Tamil Nadu), India.
Manuscript received on October 01, 2014. | Revised Manuscript received on October 05, 2014. | Manuscript published on October 15, 2014. | PP: 1-9 | Volume-2 Issue-11, October 2014. | Retrieval Number: K07231021114/2014©BEIESP
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Abstract: This paper presents a simulation study of a line commutated converter (LCC) –monopole HVDC transmission system feeding a very weak AC network with firefly algorithm based optimal proportional integral (PI) controller for the rectifier and the inverter control and hybrid reactive power compensators (RPC’s) at the inverter AC side. The hybrid compensator is an equal mix of fixed capacitor (FC) with any one of the following compensators: synchronous compensator (SC); static var compensator (SVC); static synchronous compensator (STATCOM). The HVDC transmission system model is simulated using Matlab. The transient performances of hybrid RPC’s (FC+SC, FC+SVC and FC+STATCOM) are investigated during various fault conditions and the results are compared with the performance of the SC, SVC and STATCOM to focus the supremacy of the hybrid compensators. The simulation results confirm that the equal combination of FC and STATCOM has a steady and fastest response. The outcomes also demonstrate the superiority of the firefly algorithm based optimal PI controller over the conventional PI controller. The harmonic present in the inverter AC side is also observed under steady state operation to assure the quality of power supply.
Keywords: Firefly algorithm, Hybrid RPC’s, Monopole HVDC, PI controller, Very weak AC system.