حذف اختلال سينوسي در سيستم هاي تاخير زماني مبتني بر انتگرال گير تعميم يافته ي مرتبه دوم

چكيده انگليسي :

Rejection of Sinusoidal Disturbance Acting on Time Delay Plants Based on Second Order Generalized Integrator Amirreza Silani a silani@ec iut ac ir April 21 2016 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors Supervisor Dr Javad Askari j askari@cc iut ac ir and Dr Mohsen Mojiri mohsen mojiri@cc iut ac ir Abstract Frequency estimation is a common problem in many practical applications which include the problem of disturbancerejection with unknown frequency These kinds of disturbance is identifiable thanks to its narrow frequency band so itcan be cancelled In order to achieve this goal the disturbance frequency should be estimated then this frequency estimateshould be given to a disturbance cancellation algorithm to reject sinusoidal disturbance There diverse methods which hasalready proposed for frequency estimation and are different in the terms of stability and response speed These methodsincludes phased locked loop second order generalized integrator frequency locked loop induction motor frequency esti mation Kalman filter and internal model principal In addition to the estimation of disturbance frequency these algorithmsproduce their input signal and its orthogonal signals which can be used for the rejection of disturbance One of the chal lenging issues with which we are confronted is the condition that the plant is unknown In this circumstance we shoulduse plant s estimate Furthermore in practical applications the plants roughly have time delay Overlooking this delay canreduce efficiency of the control system and even make it unstable Thus in disturbance rejection problem delay should beconsidered and the problem should be solved for unknown time delay plant In this research the method of second ordergeneralized integrator frequency locked loop is used for frequency estimation Firstly the problem is solved for knownplant without delay Then the problem is extended for unknown plant without delay which uses an adaptive estimator forplant s parameter s estimation Using frequency and plant s parameters estimates a control law is proposed to cancel si nusoidal disturbance Simulations depicts the efficiency of this algorithm Afterwards the problem is extended unknowntime delay plants and two methods are used to solve this problem In first method regardless of the fact that plant has timedelay plant s parameters are estimated and this algorithm is not different from the condition which plant does not have timedelay Simulations demonstrate that this forfeits its efficiency by rising the amount of time delay In second method adelay estimator is added to the algorithm and the parameters of a plant s part which has no time delay is estimated Usingparameter estimates a control law is proposed to reject sinusoidal disturbance Key Words Sinusoidal Disturbance Cancellation Frequency Estimation Time Delay Estimation Second Order Generalized Integrator Frequency Locked Loop Averaging Time Delay Systems

سيلاني، اميررضا

حذف اختلال سينوسي در سيستم هاي تاخير زماني مبتني بر انتگرال گير تعميم يافته ي مرتبه دوم

تخمين فركانس , روش حلقه ي قفل شده در فركانس , پايداري و روش ميانگين گيري