Optimal Design of UPFC Based Damping Controller Using PSO and QPSO
The Unified Power Flow Controller (UPFC) is regarded as one of the most versatile devices in the FACTS device family which has the ability to control the power flow in the transmission line, improve the transient stability, mitigate system oscillation, an
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Abstract The Unified Power Flow Controller (UPFC) is regarded as one of the most versatile devices in the FACTS device family which has the ability to control the power flow in the transmission line, improve the transient stability, mitigate system oscillation, and provide voltage support. In this book chapter, the problem of UPFC based damping controller is formulated as an optimization problem which is solved using classic and Quantum-behaved Particle Swarm Optimization technique (QPSO). Two different objective functions are proposed in this work for the UPFC based damping controller design problem. The first objective function is the eigenvalues based comprising the damping factor, and the damping ratio of the lightly damped electromechanical modes, while the second is the time domainbased multi-objective function. The performance of the proposed controllers under different disturbances and loading conditions is investigated for a single machine infinite bus and multi-machine power systems. The results of the proposed controllers are demonstrated through eigenvalue analysis and nonlinear time domain simulation.
1 Introduction As power demand grows rapidly and expansion in transmission and generation is restricted with the limited availability of resources and the strict environmental constraints, power systems are today much more loaded than before. This causes
H. Shayeghi (&) Technical Engineering Department, University of Mohaghegh Ardabili, Ardabil, Iran e-mail: [email protected] A. Safari Electrical Engineering Department, Azarbaijan Shahid Madani University, Tabriz, Iran e-mail: [email protected]
N. Bizon et al. (eds.), Analysis, Control and Optimal Operations in Hybrid Power Systems, Green Energy and Technology, DOI: 10.1007/978-1-4471-5538-6_5, Springer-Verlag London 2013
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the power systems to be operated near their stability limits. In addition, interconnection between remotely located power systems gives rise to low frequency oscillations in the range of 0.2–2.0 Hz. If not well damped, these oscillations may keep growing in magnitude until loss of synchronism results [1, 2]. In order to damp these power system oscillations and increase system oscillations stability, the installation of Power System Stabilizer (PSS) is both economical and effective. PSSs have been used for many years to add damping to electromechanical oscillations. However, PSSs suffer a drawback of being liable to cause great variations in the voltage profile and they may even result in leading power factor operation and losing system stability under severe disturbances, especially those three-phase faults which may occur at the generator terminals [3]. In recent years, the fast progress in the field of power electronics had opened new opportunities for the application of the Flexible Alternative Current Transmission Systems (FACTS) devices as one of the most effective ways to improve power system operation controllability and power transfer limits. FACTS-devices provide a better adapta
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