BHARATHIDASAN ENGINEERING COLLEGE, NATTRAMPALLI DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING UNIT I
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1 BHARATHIDASAN ENGINEERING COLLEGE, NATTRAMPALLI DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING FAQ-EE6010 HIGH VOLTAGE DC TRANSMISSION UNIT I Part -A 1. List out two merits of AC and DC transmission 2. What are the types of DC link? 3. Draw the block diagram of bipolar link 4. List the types of power devices for HVDC transmission 5. Write the advantages and disadvantages of HVDC transmission? 6. Mention the some of HVDC projects from abroad? 7. What are the types of power losses in thristor? 8. Define Reliability. 9. Energy Availability. 10.Write down any two application DC transmission? 11.What are the factors to be considered for planning HVDC transmission? 12.What are the advantages of LTT over ETT? 13.Distinguish between AC & DC transmission. 14. What is meant by MOS controlled thyristor? 15.State atleast four HVDC projects in India. 16.What is meant by an Asynchronous tie? 17.What is LASCR? How does it differ from a conventional SCR? 18.Why circuit turn off time should be greater than the thyristor turn-off time? 19.What is the turn-off time for converter grade SCRs and inverter grade SCRs? 20.What are the types of commutation Part B 1. For a fixed power transmission explain how the economic choice of voltage level selected in dc transmission system
2 2.Explain the technological development in control and protection, for better performance and reliability of dc transmission system 3.What are the different applications of dc transmission system? Explain them in detail? With neat sketches explain the different kinds of dc link available? 4.Explain the comparison of AC and DC transmission in detail 5.Explain the application of dc transmission 6.Explain in detail about the planning of hvdc transmission? 7.Explain the technological development of modern trends in dc transmission 8.Explain the major components of a hvdc transmission in converter station unit? 9.State the advantages and disadvantages of dc transmission system with following economics, reliability, performance.. UNIT II Part- A 1. What is firing angle? 2. Draw the circuit of Graetz CIRCUIT. 3. What is meant by pulse number of a converter? 4. List some of the converters in HVDC systems. 5. Define value rating. 6. What are the merits of twelve or multibridge pulse converter? 7.How can the converter configuration defined? 8. List the assumption made to develop the equivalent circuit of a converter 9. Define overlap and overlap angle. 10.Write the assumptions for analysis of 6 pulse converter? 11.Write the average direct voltage expression for graetz circuit? 12.Mention the various modes of operation of rectifier characteristics. 13.Mention the various modes of operation of inverter characteristics? 14.Mention the various modes of characteristics of 12 pulse converter. 15.Draw the equivalent circuit of rectifier. 16.Draw the thyristor voltage waveform for inversion for 6 pulse converter.
3 17.Draw the a.c current waveform. 18.When star to delta star connected transformer 19.Draw the circuit diagram of 12 pulse converter. 20.Why series and parallel operation of thristor in HVDC TRANSMISSION? 21.What is mean by snubber circuits? Part- B 1. For a 3 phase 6 pulse gratez s circuit draw the timing diagram considering overlap angle is less than 60 degree and without overlap for the following a)voltage across load b) Voltage across any two pair of conduction valves 2.Explain the individual characteristics of a rectifier and an inverter with sketches 3.Draw the schematic circuit diagram of a 6 pulse gratez s circuit and explain its principle of operation 4.Discuss in detail the effect of source inductance on hvdc system 5.Show the rating of the valve used in gratez circuit is 2.094Pd where Pd is dc power transmitted 6.Explain the effect of overlap angle on the performance of converter circuit 7.Explain the choice of converter configuration for any pulse number Explain the analysis of 12 pulse converter with bridge rectifier 8.Explain the technique involved in harmonic elimination of bridge rectifier 9.Explain the analysis of two and three valve conduction mode 10. With detailed analysis of converter with steady state analysis UNIT III Part- A What is meant by firing angle control? 2. Write the features control? 3. Why the necessity of control in a DC link? 4. What is the principal of control in DC link? 5. What is meant by current and extinction control?
4 6. State any four important reasons why the current control is desirable in the 7. How power is reversed in HVDC link? 8. Define current margin. 9. Draw backs of constant current control(ccc ). 10. What are the parameters to change current and power transfer in DC link? 11. What is meant by compounding? 12.Define required regulation? 13. Draw the characteristics of compounding of inverter. 14.What is the use of transformer tap changer control at the inverter side of an HVDC system? 15. What is the use of tap changing transformer in HVDC systems? 16. Draw the communication link of the HVDC transmission. 17. What is meant by compounding a converter? 18. What is the need for transformer tap changer control of HVDC converter? Part B 1. Explain the individual characteristics of a rectifier and an inverter with sketches 2.Explain in detail about the transformer tap changer with its types 3.Explain in detail about the converter control characteristics of hvdc system 4.Draw and explain the inverter and rectifier compounding characteristics with constant voltage and current curve. 5.Explain the uncompounded inverter with neat sketches 6.Explain in detail the concept of reactive power requirement in hvdc converters 7.Explain in detail about current regulation from the inverter side 8.With the block diagram, discuss the principle of operation of a basic power controller UNIT IV Part- A 1.Mention the performance criteria for selection of harmonic filter 2. Mention the Types of filters 3. Differentiate characteristic and non-characteristic harmonics.
5 4. State the ill effects of harmonics injected into the AC line? 5. What is radio interference? 6.What are the source of hormonics 7. What are the effects of trouble caused by harmonics? 8. Define THD. 9. What are the means to reduce harmonis? 10. List the causes of non-characteristics harmonis. 11. Write the effects of unbalanced voltages. 12.Mention the criteria for selection of dc filter 13. Define short circuit ratio(scr) 14. What are the factors depends commutation failure? 15. Function of smoothing reactor Part- B 1. Explain the generation of Harmonics in HVDC system 2.Explain detail about the analysis of single and double tuned AC filters and write the design criteria for AC filters. 3.Explain in detail about the passive and active DC filters with the design criteria. 4.Write short notes on: (a) Stability aspects of synchronous link. (b) Filters for harmonic elimination in HYDC-system 5.Discuss criteria of design of a.c. filters. Also mention various types of a.c. filters and show their circuit configuration and impedance characteristics 6.Why are harmonics generated in HVDC converter and what are the problems associated with the harmonics. Suggest some remedial measures. 7.Explain the characteristics and non- characteristics harmonics in HVDC converter system. 8.Write short note on the following terms: 1. Harmonic distortion 2.TIF 3. THFF
6 9.What are the types of AC filters? Also explain with waveforms 10.Write criteria for design of AC filters. UNIT V Part- A 1. What is HVDC simulator? 2. What are the requirements of a good simulation tool? 3. List some tools used for the simulation of HVDC simulation. 4. Application of HVDC transmission 5. What is parity simulator? 6. Draw the EMTP representation of lumped inductor and capacitor. 7. List the assumption made to develop the equivalent circuit of a converter 8. What are the applications of DC simulator? 9. State the advantages of parity simulator? 10. Write the system studies required for design of HVDC system. 11. Write the advantages of digital dynamic simulation. 12. Write the disadvanges of digital dynamic simulation. 13.Mention the types of volve model 14.What are the approaches used for transient analysis of electrical network? 15. What are two types of programs used for HVDC system studies? 16. What are advantages of EMPT representation of elements in DC system? 17. Write the equations representing the equivalent circuit of lumped element. 18. Drawbacks of parity simulation. 19. Mention the some problems studied for DC simulator. 20. Comparison between insulation characteristics of DC and AC cable. 21. Write practical dielectrics used in HVDC cables. 22. Compare the DC and AC cables from economic point of view. Part- B 1. Brief about the various types of system studies in design of HVDC system.
7 2.Explain the modeling of HVDC systems for digital dynamic simulation. Describe the operation of physical simulator. 3.Explain the various problems studies using DC simulator. Describe the operation of parity simulator 4.Discuss about the advantages and disadvantages of digital dynamic simulation. 5.Write short on valve model and firing pulse generation. 6.Explain the practical dielectric used in hvdc cables. 7.Explain the operation of dielectric stress considerations. 8.Explain the thermal consideration and losses in dc cables. [Note: EE6010 HVDC Transmission Syllabus is a revised one, so above questions covered full syllabus]
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