Design of decentralized load-frequency controllers for interconnected power systems with AC-DC parallel tie-lines and GDB nonlinearity using MOEA.

S  Ganapathy and S  Velusami

doi:10.17485/ijst/2009/v2i7.10

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Design of decentralized load-frequency controllers for interconnected power systems with AC-DC parallel tie-lines and GDB nonlinearity using MOEA.

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Indian Journal of Science and Technology

DOI: 10.17485/ijst/2009/v2i7.10

Year: 2009, Volume: 2, Issue: 7, Pages: 18-22

Original Article

Design of decentralized load-frequency controllers for interconnected power systems with AC-DC parallel tie-lines and GDB nonlinearity using MOEA.

S. Ganapathy and S. Velusami

Dept. of Electrical Engineering, Annamalai University, Annamalainagar-608 002,Tamilnadu, India

*Author for the correspondence:
S. Velusami
Dept. of Electrical Engineering, Annamalai University,
Annamalainagar-608 002,Tamilnadu, India
E-mail: [email protected]

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

A new design of decentralized load-frequency controllers for interconnected power systems with AC-DC parallel tie-lines and governor dead band (GDB) nonlinearity using multi-objective evolutionary algorithm (MOEA) is proposed. A HVDC link is connected in parallel with an existing ac tie-line to stabilize the frequency oscillations of the ac system. The proposed control strategy is mainly based on a compromise between integral squared error and maximum stability margin criteria. A two area interconnected thermal power system is considered to demonstrate the validity of the proposed controller. The simulation results show that the system dynamic performance has been improved with increased stability margin when compared to a conventional controller.

Keywords: AC-DC tie-lines, governor dead band nonlinearity, load-frequency control, multi-objective evolutionary algorithm.