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Articles by M. Ugur Unver
Total Records ( 3 ) for M. Ugur Unver
  Mehmet Tumay , Ilyas Eker , H. Firat Aksoy , A. Mete Vural and M. Ugur Unver
  This part of the paper is concern with the development of a mathematical model for the simulation of sysnchronous and asynchronous machine using three-phase coordination. The phase coordinate method allows ready analysis of system unbalance, and the model is applicable to alternating current machines under these conditions. The paper deals with the implementation of AC machine and drives dynamic equations.
  Mehmet Tumay , Ilyas Eker , H. Firat Aksoy , . Mete Vural and M. Ugur Unver
  In this part, an alternating current machines drives and control methods were implemented. Fortran Language program were used for digital simulation. A six-step inverter and sinusoidal pulse-width modulation inverter are used for the induction machine. With indirect vector control method introducing into the current-controlled dead-beat inverter derive system, the induction motor can be operated in all four quadrants and speed can be controlled from zero to full value where a smooth and fast torque response is obtained throughtout the range of the operation. Different types of simulation examples are examined for AC machines and results are discussed.
  Mehmet Tumay , Ilyas Eker , Vedat Kasli Ergun Ercelebi and M. Ugur Unver
  In order to specify appropriate protection equipment and switchgear and to evaluate winding stresses and shaft torques subsequent to unsymmetrical operation full three-phase dynamic analytical techniques are necessary. In this paper a methodology of machine interconnection is presented which uses a combination of nodal analysis and current summation. In the combined method, a synchronous generator is treated not only as current source but also a voltage source. Thus in the procedure adopted it is not only the current flow which is of interest but also the voltage characteristics of the machine. When conducting simulation studies for accurate protection of the power system network, transducers (Current Transformer (CT) and Capacitor Voltage Transformer (CVT)) should be represented very accurately. The present work also describes the integration of the transducers into a small power system network for protection signalling. The transducers are represented including magnetic non-linearity and hysteresis effects. The practical application of the analysis under abnormal operation is presented and the responses of the transducers are examined.
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