LOC-PSS Design for Improved Power System Stabilizer
الموضوعات :Masoud Radmehr 1 , Mehdi Mohammadjafari 2 , Mahmoud Reza ‎ GhadiSahebi 3
1 - Department of Electrical Engineering, Gorgan Branch, Islamic Azad University, Gorgan, Iran
2 - Department of Electrical Engineering, Gorgan Branch, Islamic Azad University, Gorgan, Iran
3 - Department of Electrical Engineering, Gorgan Branch, Islamic Azad University, Gorgan, Iran
الکلمات المفتاحية: Power System Stabilizer, CPSS, LOC-PSS, SMIB, Heffron-Phillips, Robust Systems Control,
ملخص المقالة :
A power system stabilizer (PSS) is an ancillary device used for improving stability of otherwise poorly stable power system. It helps to restore the system back to the operating point after disturbances like load changes or faulty situations are withdrawn or smoother transition from one to another operating point. Originally, power system stabilizers are installed to add damping to local oscillatory modes, which were destabilized by high gain, fast acting exciters. Its property is to provide damping torque to reduce the electromechanical oscillations introduced in the system under disturbances. In this paper, first, we analyze different types of small signal stabilities of a power system using linearized model and then, design a stabilizer for Single Machine Infinite Bus (SMIB) system. A comparison between the effect of Linear Optimal Control plus PSS (LOC-PSS) and Conventional PSS(CPSS) in terms of either power system responses or its eigen-values due to different load condition is reported. Simulation results show the LOC- PSS is robust for such nonlinear dynamic system and achieves better performance than the CPSS in damping oscillations. The effectiveness of the PSS for different load disturbances is illustrated with simulation carried out in MATLAB software.
[1] N. A. M. Kamari, I. Musirin, M. M. Othman, "EP based optimization for estimating synchronizing and damping torque coefficients", Australian Journal of Basic and Applied Sciences, 4(8)(2010): 3741-3754.
[2] S.V. Heidari, M. Sedighizadeh, M. Ahmadzadeh, and S. Mohammadzadeh, "Optimal coordination of PSS and TCSC for improving of dynamic stability in power systems using genetic algorithm", Canadian Journal on Electrical and Electronics Engineering, 2(5)( 2011): 136-143.
[3] S. Panda, R.N. Patel, and N.P. Padhy, "Power system stability improvement by TCSC controller employing a multi-objective genetic algorithm approach", International Journal of Electrical and Computer Engineering, 1(7)( 2006): 553-560.
[4] S. Panda, N.P. Padhy, "Power system with PSS and FACTS controller: modelling, simulation and simultaneous tuning employing genetic algorithm", International Journal of Electrical and Electronics Engineering, 1(1)( 2007): 493-502.
[5] S. P. Hadi, "Dynamic modelling and damping function of GUPFC in multi-machine power system", The Journal for Technology and Science IPTEK, 22(4)(2011): 205-213.
[6] R. Ramya, K.Selvi, S.S.Nivethitha, "Application of optimization technique in designing robust PSS for two machine system", International Journal of Innovative Research in Science, Engineering and Technology, 3(Sp. 3)(2014): 1447-1452.
[7] A. M. Yousef, " Improved power system stabilizer by applying LQG controller", Advances in Electrical and Computer Engineering, 8 (1)(2008): 117-127.
[8] G. Gurrala, I. Sen, "Novel approach for the design of state feedback power system stabilizers", IEEE Int. Conf. on Power System Technology, 2010.
[9] A. S. Oshaba,"Stability of multi-machine power system by used LQG controller, WSEAS Trans. on Power Systems, 9( 2014): 143-154.
