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Reliability analysis of earth slopes using hybrid chaotic particle swarm optimization

Journal of Central South University 2011年第5期18卷 1626-1637页

作者： m.khajehzadeh m.R.Taha A.El-Shafie Civil and Structural Engineering Department University Kebangsaan MalaysiaBangi43600SelangorMalaysia

A numerical procedure for reliability analysis of earth slope based on advanced first-order second-moment method is presented,while soil properties and pore water pressure may be considered as random *** factor of safety and performance function is formulated utilizing a new approach of the morgenstern and Price *** evaluate the minimum reliability index defined by Hasofer and Lind and corresponding critical probabilistic slip surface,a hybrid algorithm combining chaotic particle swarm optimization and harmony search algorithm called CPSOHS is *** comparison of the results of the presented method,standard particle swarm optimization,and selected other methods employed in previous studies demonstrates the superior successful functioning of the new method by evaluating lower values of reliability index and factor of ***,the presented procedure is applied for sensitivity analysis and the obtained results show the influence of soil strength parameters and probability distribution types of random variables on the reliability index of slopes.

关键词： reliability analysis stability assessment earth slopes particle swarm optimization harmony search

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Gravitational search algorithm for coordinated design of PSS and TCSC as damping controller

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Journal of Central South University 2012年第4期19卷 923-932页

作者： m.Eslami H.Shareef A.mohamed m.khajehzadeh Department of Electrical Electronic and Systems EngineeringUniversity Kebangsaan MalaysiaBangi 43600SelangorMalaysia

A newly developed heuristic global optimization algorithm, called gravitational search algorithm （GSA）, was introduced and applied for simultaneously coordinated designing of power system stabilizer （PSS） and thyristor controlled series capacitor （TCSC） as a damping controller in the multi-machine power system. The coordinated design problem of PSS and TCSC controllers over a wide range of loading conditions is formulated as a multi-objective optimization problem which is the aggregation of two objectives related to damping ratio and damping factor. By minimizing the objective function with oscillation, the characteristics between areas are contained and hence the interactions among the PSS and TCSC controller under transient conditions are modified. For evaluation of effectiveness and robustness of proposed controllers, the performance was tested on a weakly connected power system subjected to different disturbances, loading conditions and system parameter variations. The cigenvalues analysis and nonlinear simulation results demonstrate the high performance of proposed controllers which is able to provide efficient damping of low frequency oscillations.

关键词： gravitational search algorithm power system stabilizer thyristor controlled series capacitor tuning

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