M.E – POWER SYSTEMS ENGINEERING PS9154 – HIGH VOLTAGE DIRECT CURRENT TRANSMISSION IMPORTANT QUESTIONS

M.E – POWER SYSTEMS ENGINEERING

PS9154 – HIGH VOLTAGE DIRECT CURRENT TRANSMISSION

UNIT – I

DC POWER TRANSMISSION TECHNOLOGY

2 MARK QUESTIONS:

1.       Compare AC and DC Transmission.

2.       Define Energy Availability.

3.       Define Transient Reliability.

4.       What are all the applications of DC Transmission?

5.       What are the types of DC Links?

6.       What is meant by Converter Station?

7.       Write the different configurations of Converter Transformers.

8.       Mention the types of Filters.

9.       Define Smoothing Reactor.

10.   What is the purpose of DC Switchgear?

11.   What are the disadvantages of DC Transmission?

12.   What is meant by Ground Impedance?

13.   What is the use of Line Compensation?

14.   Where the reactive power control is required?

15.   What are the advantages of DC Transmission over AC Transmission?

16.    What are the factors considered for planning of HVDC system?

17.   Write the different configurations of DC link for Interconnections.

18.   What are the considerations required to choose the DC Interconnection?

19.   What are aspects required for System Interaction?

20.   What is the reason to move to the Modern trends in HVDC technology?

BIG QUESTIONS:

1.       Explain the comparison of AC and DC transmission.

2.       Explain the different applications of DC transmission.

3.       Explain the planning for HVDC transmission.

4.       Explain the different configurations of DC Links.

5.       Explain Modern trends in HVDC technology.

UNIT – II

ANALYSIS OF HVDC CONVERTERS AND HVDC SYSTEM CONTROL

1.       What is Line Commutated Converter?

2.       What are the modes available in Line Commutated Converter?

3.       Draw the equivalent circuit of 3 valve conduction mode.

4.       Draw the equivalent circuit of 4 valve conduction mode.

5.       Mention the modes of Rectifier unit.

6.       Draw the LCC Bridge characteristics.

7.       Write the modes of Inverter station.

8.       What are the different modes of operation in a Twelve Pulse Converter?

9.       What are assumptions made in the analysis of converters?

10.   What is the principle of DC Link Control?

11.   What are the conditions of current control at rectifier station?

12.   Write the reasons which are not desirable the feedback control of power in a DC Link.

13.   Draw the Converter Control Characteristics.

14.   Write the three different modes of operation in a converter control characteristics.

15.   Draw the Hierarchical control structure for a DC link.

16.   What is meant by firing angle control?

17.   Draw the block diagram of pole and converter controllers.

18.   What are types of firing schemes?

19.   What is the main feature of individual phase control?

20.   Define constant α control.

21.   Define inverse cosine control.

22.   Write the drawbacks of individual phase control.

23.   What are the types of equidistant pulse control?

24.   Draw the block diagram of pulse frequency control.

25.   Write the drawbacks of equidistant pulse control.

26.   Draw the block diagram of current control.

27.   What is meant by extinction angle control?

28.   What is meant by harmonics?

29.   Draw the block diagram of power and auxiliary controller.

30.   Write some types of higher level controller.

UNIT – III

MULTITERMINAL DC SYSTEMS

1.       What is meant by Multi-terminal system?

2.       What are the applications of MTDC systems?

3.       What are the types of MTDC system?

4.       Define series MTDC system.

5.       Define parallel MTDC system.

6.       Compare series and parallel MTDC system.

7.       What are the methods available in MTDC systems?

8.       Define Current margin method.

9.       What are the modification methods available in current margin control?

10.   What is voltage limiting control?

11.   What are the drawbacks of voltage limiting control?

12.   Define DCRB.

13.   What is Two ACR method?

14.   Write some typical problems in MTDC systems.

15.   What are the protection requirements of MTDC systems?

16.   Draw the Multi-terminal characteristics curve.

17.   What are the typical problems available in MTDC system?

18.   How to reduce the typical problems in MTDC system?

19.   Draw the Static V-I characteristics of Two ACR method.

20.   Write the types of parallel MTDC system.

UNIT – IV

POWER FLOW ANALYSIS IN AC/DC SYSTEMS

1.       What is the need for power flow analysis?

2.       Write the different methods of power flow analysis in AC/DC systems.

3.       Write the general equation of nonlinear system subject to certain constrains.

4.       What are the control variables of AC system?

5.       What are the control variables of DC system?

6.       What are the assumptions made in the derivation of the equations representing the AC/DC converter?

7.       Draw the basic converter model.

8.       Write the converter equations.

9.       What are the basic quantities of flexible per unit system?

10.   What are the steps taken in the power flow analysis of MTDC-AC system?

11.   Write the equations of DC network.

12.   Draw the Norton’s equivalent circuit of a converter.

13.   Write the concept of power flow analysis in AC/DC systems.

14.   What are the general methods of power flow analysis?

15.   Write the different solution procedure of power flow analysis in AC/DC systems.

UNIT – V

SIMULATION OF HVDC SYSTEMS

1.       What is system simulation?

2.       What are the tools employed for the simulation of a dynamic system?

3.       What are the requirements of good simulation tools?

4.       What are the system studies available in the design of HVDC system?

5.       Define HVDC simulator.

6.       Draw the model of a converter transformer.

7.       What are the problems obtained in a DC simulator?

8.       Write the applications of a DC simulator.

9.       What is the principle of parity simulator?

10.   What are the advantages of parity simulator?

11.   What are the advantages of digital dynamic simulation?

12.   What are the disadvantages of digital dynamic simulation?

13.   What are the assumptions made in modeling of DC systems for digital dynamic simulation?

14.   Define Valve model.

15.   What are the type’s gate pulse generations?

16.   Write the types of equidistant pulse control.

17.   Draw the circuit diagram of a bridge converter.

18.   Draw the equivalent circuit of bridge converter.

19.   What are assumptions made in the equivalent circuit of bridge converter?

20.   Differentiate dynamic interaction between DC and AC systems.