# مقالههای Lesani

**توجه:**محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.

##### ۱TUNING OF DECENTRALIZED CONTROLLERS FOR STABILIZATION OF POWER SYSTEMS USING GENETIC ALGORITHM

اطلاعات انتشار:
پانزدهمین کنفرانس بین المللی برق،
سال ۱۳۷۸

تعداد صفحات:
۱۱

The paper considers simultaneous placement and tunning of decentralized power system stabilizers for symbolization of power systems over a wide range of operating conditions by using genetic algorithm The power system operating at various conditions is considered as a finite set of plants. The problem of sertting parameters of power system stabilizers is converted as a simple optimization problem which is solved by a genetic algorithm and an eigenvalue–besed objective function. A single machine –infinite bus system and a multi machine system are considered to test the suggested technique. The optimum placement and running of parameters of PSS's are done simoultanousely.A PSS tuned using this procedure is robust to different operating conditions and structure changes of the system.<\div>

##### ۲Mathematical Model for Transformer Winding to Diagnose radial Deformation

اطلاعات انتشار:
شانزدهمین کنفرانس بین المللی برق،
سال ۱۳۸۰

تعداد صفحات:
۱۴

The application of the transfer function is discussed at present as a method for on–site monitoring and diagnoses of power transformers with regard to mechanical damages of the winding. In order to be able to evaluate the measurements, the correlation between the characteristics of transfer functions and possible damages must be known. Radial deformation of transformer windings have been studied experimental and theoretical. The primary winding of the test transformer has 30 double disk coiis (1.2 MVA, 10 kV) and the secondary is a one layer winding with

23 turns (1.2 MVA, 400 V). A detailed mathematical model were developed for the test object and a comparison between measured and calculated results was carried out. A numerical method for the calculation of inductances is suggested, which is independent of the shape of the windings' turns. For the calculation of the earth capacitances or coupled capacitances a relationship is given. An independent simulation

confirmed the accuracy of this relationship by using finite elements method. It is shown that the developed model can represent the behavior of transformer windings in the frequency domain in case of sound and deformed conditions.<\div>

23 turns (1.2 MVA, 400 V). A detailed mathematical model were developed for the test object and a comparison between measured and calculated results was carried out. A numerical method for the calculation of inductances is suggested, which is independent of the shape of the windings' turns. For the calculation of the earth capacitances or coupled capacitances a relationship is given. An independent simulation

confirmed the accuracy of this relationship by using finite elements method. It is shown that the developed model can represent the behavior of transformer windings in the frequency domain in case of sound and deformed conditions.<\div>

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