Possible questions of the oral exam

Pagina 1

ORALE DI SISTEMI E MACCHINE ELETTRICHE First part: 1. Describe the structure of the synchronous machine and derive the equivalent circuit. 2. Starting from the equivalent circuit of the induction machine, find the equation of the torque. Represent the torque on a diagram and comment it. 3. Describe the rotating magnetic field via the various methods to generate it. Provide the proof of the Galileo Ferraris theorem. 4. Show how to obtain the capability curves for a synchronous generator and comment their structure. 5. Draw and describe the operation of the Single-Phase, Full-Wave Diode Bridge circuit. 6. Describe line-V oltage Control approaches and Rotor-Resistance Control. Second part 1. The admittance matrix: derive and describe the methods available to compute it. 2. The Gauss method: definition, graphical interpretation and its application to the power flow equations. 3. Primary and secondary frequency control. 4. Describe the impact of the Renewable Energy Sources (RES) on the Electricity Market and on the Distribution Network. 5. Obtain and prove the methods to compute the bus admittance matrix. 6. Describe the N and N-1 security criteria also using a numerical example. 7. Describe the impact of the dispersed generation on the Electricity Market and on the Electric Power System. 8. Describe the voltage control in power systems and the ORPF models (goals, objective function and constraints). Domande di teoria orale tratte da esami orali del vecchio corso: •Ricavare i circuiti della macchina asincrona nelle diverse condizioni di funzionamento. •RES: impatto sul mercato dell'energia elettrica e impatto su controllo di frequenza. •Commentare due diagrammi presi su internet di costo e consumo dell'energia in un giorno di luglio con domanda sul fatto che fossero andamenti…