基于PSO技术电力系统暂态稳定分析.docVIP

Engineering, 2011, 3, 478-484 doi:10.4236/eng.2011.35055 Published Online May 2011 (http://www.SciRP.org/journal/eng) Transient Stability Analysis of Power System by Coordi- nated PSS-AVR Design Based on PSO Technique Ali Darvish Falehi, Mehrdad Rostami, Hassan Mehrjardi Department of Engineering, Shahed University, Tehran, Iran E-mail: {darvishfalehi, rostami}@shahed.ac.ir Received March 8, 2011; revised April 1, 2011; accepted April 19, 2011 Abstract In this paper, Power System Stabilizer (PSS) and Automatic Voltage Regulator (AVR) are coordinated to improve the transient stability of generator in power system. Coordinated design problem of AVR and PSS is formulated as an optimization problem. Particle Swarm Optimization (PSO) technique is an advanced robust search method by the swarming or cooperative behavior of biological populations mechanism. The perform- ance of PSO has been certified in solution of highly non-linear objectives. Thus, PSO technique has been employed to optimize the parameters of PSS and AVR in order to reduce the power system oscillations dur- ing the load changing conditions in single-machine, infinite-bus power system. The results of nonlinear simulation suggest that, by coordinated design of AVR and PSS based on PSO technique power system os- cillations are exceptionally damped. Correspondingly, it’s shown that power system stability is superiorly enhanced than the uncoordinated designed of the PSS and the AVR controllers. Keywords: Power System Satiability, Coordinated Design, PSS, AVR, Particle Swarm Optimization 1. Introduction oscillations. A variety of conventional design techniques can be used to tune controller parameters. The most common methods are based on the pole placement method [13,14], eigenvalues sensitivities [15,16], residue compensation [17], and also the current control theory. Lucklessly, the conventional methods are time con- suming as they are repetitive and need hea