تخمين شار در ماشين‌هاي الكتريكي با استفاده از انتگرال‌گير مرتبه دوم تعميم يافته

چكيده انگليسي :

Flux Estimation in Electrical Machines Using Second Order Generalized Integrator Alireza onsori a onsori@ec iut ac ir August 22 2020 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors Assoc Prof Mohsen mojri mohsen mojiri@iut ac ir Advisor Assist Prof Masood hajian m hajian@iut ac ir Abstract Measurement of the flux is a very important task to control methods of electrical motors such as vector control and directtorque control In sensorless speed control of induction motors the position and speed of the rotor must be estimated fromother parameters such as flux In the operational phase the measurement sensors especially current sensors which havemeasurement error values Also any change in motor parameters causes the flux not to be measured accurately and to be anestimate of the actual flux Various methods have been proposed to the flux estimation including voltage model based fluxestimation which involves integrating of the back electromotive force called the pure integration which has three problems the saturation of the integrator due to the input DC component the DC bias due to the initial conditions of the integratorand the harmonics several methods have been proposed to solve these problems such as the approximate integrator whichis a low pass filter This method does not have the pure integration saturation and can discharge the DC bias but it causesamplitude and phase errors in the estimated flux that it requires a compensation which it causes increasing the complexityof the system The second order generalized integrator as the approximate integrator can be eliminate the DC bias andfurther attenuation the harmonics rather than the two previous methods although the DC component problem persists Inaddition this system requires the frequency of the input signal for its operation if the frequency of the input signal isunknown is estimated by a frequency locked loop which has an unfavorable performance in the presence of harmonics The proposed method is a combination of a low pass filter with a second order generalized integrator structure called LPF SOGI which is more capable of harmonic attenuation as well as a more accurate and faster frequency estimation and ismore resistant to noise resulting in more accurate flux estimation Although it does not have a positive effect on the DCcomponent The stability analysis of LPF SOGI is based on the averaging and singular perturbation theorems By replacingthe moving average filter with a low pass filter in the proposed system MAF SOGI emerges which compared to LPF SOGI can eliminate certain multiples of harmonics and the DC component To remove most of the harmonic and DC components sub filters based on the moving average filter are introduced which by combining with SOGI LPF SOGI and especiallyMAF SOGI it can be claimed that with the lowest possible order more destructive have been removed Thus LPF SOGIand MAF SOGI replace SOGI and can be used in network frequency estimation telecommunication applications powersystems and flux estimation simulations confirm the performance of the proposed algorithms Key Words Second order generalized integrator Low pass filter Flux estimation Frequency locked loop Moving average filter Singular perturbation

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تخمين شار در ماشين‌هاي الكتريكي با استفاده از انتگرال‌گير مرتبه دوم تعميم يافته

انتگرال‌گير مرتبه دوم تعميم يافته , فيلتر پايين گذر , تخمين شار , حلقه‌ي قفل شده در فركانس , فيلتر ميانگين متحرك , آشفتگي تكين