Interconnected Systems Interview Questions:
Following are the below Interconnected Systems Interview Questions and Important Questions which is very useful for interviews and exams
1. Discuss the advantages and limitations of interconnected system of power stations:
2. Two alternators having normal reactances in their armature circuits are connected in parallel. Will they successfully operate ? Explain your answer with the help of phasor diagrams.
3. Derive an expression for the synchronising power of two alternators operating in parallel in terms of their emf (E), synchronous reactance (Xs) and electrical angle of displacement (0). Neglect the winding resistances and assume that alternators are not supplying any load.
4. What is the effect of changing excitation of one of the machines when two alternators are running in parallel ?
5. Explain, how the active and reactive power loading of an alternator working on infinite bus-bar is controlled.
6. Explain, with diagrams, the changes in the armature current and power factor of an alternator connected to constant voltage constant frequency bus-bars when the excitation is varied over a certain range and input to the prime mover is kept constant.
7. Explain the necessity of interconnecting reactor for successful parallel operation of two generating stations. Obtain an expression for the power limit of the interconnector.
8. What are the necessary conditions under which power is transmitted through an interconnector between two power stations ?
9. Explain the method of affecting a power transfer between two stations of an interconnected system by phase angle control.
10. Describe the method of controlling (1) the active power (kW) and (it) the reactive power (kVAR) between two interconnecÂted power stations.
11. What are the advantages and disadvantages of interconnection of power stations? Explain the methods of affecting a power transfer between two stations.
12. Discuss the importance of interconnection in power system. Explain how reactive power can be controlled in such systems.
13. Explain how the voltage of a load bus is maintained constant by injection of reactive power ? What are the sources of reactive power ?
14. Explain in brief the various methods of load frequency control.
15.What are the objectives of automatic generation control ? Discuss in brief how these objectives are met.
16. Discuss automatic load dispatching in modern power systems.
17. Describe briefly the principle of operation of load dispatch organisation coordinating different types of power plants in a power system.
18. Write the importance of (i) load dispatch organisation and (ii) interconnection of power stations.
19. What are the objectives of ‘automatic generation control’ ? Discuss in brief how these objectives are met.
20. Write short notes on the following :
- Interconnected system.
- Synchronous machines on infinite bus-bars.
- Economical loading of alternators.
- Load sharing and power transfer between stations.
- Power limit of interconnectors.
- Load frequency control in interconnected power system.
- Load dispatching organisation.
- Automatic load dispatching.