HIGH VOLTAGE DIRECT CURRENT TRANSMISSION (HVDC)
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Important Questions
Full Questions Prepared by
J.RAM KUMAR(AP/EEE)
MAHENDRA COLLEGE OF ENGINEERING
J.RAM KUMAR(AP/EEE)
MAHENDRA COLLEGE OF ENGINEERING
**(Starred questions prepared by me for late bloomers )
Santhosh (Admin )
Late bloomers study ** to get pass
Santhosh (Admin )
unit 1
1. Comparison of AC and DC transmission (or) Comparison HVDC & EHVAC based on Economics,Reliability&Performance**
2. Hvdc transmission system arrangement and converter Bridge arrangements in HVDC system.
3.. Classification of HVDC links.
4. Type And Apps of MTDC**
Unit 2
1. Gratez circuit **
(6 pulse operation as rectifier, Different mode of operation of gratez circuit. 2 and 3 valve operation , 3 and 4 valve operation is important) 3. 12 pulse converter.
(6 pulse operation as rectifier, Different mode of operation of gratez circuit. 2 and 3 valve operation , 3 and 4 valve operation is important) 3. 12 pulse converter.
4. Six pulse -Converter bridge when operating as a i) rectifier and ii) inverter**
Unit 3
1. Firing angle control,HVDC-VSC s/m**
2. Compounding characteristics of inverter and rectifier
3. Constant current and constant extinction angle control
4. Starting and stopping of DC link
4. Starting and stopping of DC link
5. Converter control characteristics of HVDC system**
Unit 4
Harmonics
1. Explain in detail about characteristic and non characteristic harmonics **
Harmonics
1. Explain in detail about characteristic and non characteristic harmonics **
Filters
2. Different types of AC filters (minimum cost filter single tuned filters) with performance indices of AC filters**
3. Different types of DC filters and judging the effectiveness of DC filters**
(Or)
4. Reactive,Power requirement in a HVDC converter, affected by the converter control methods**
4. Reactive,Power requirement in a HVDC converter, affected by the converter control methods**
Unit 5
1.Modelling of hvdc using digital dynamic simulation and parity simulator**
2. Advantage and disadvantage of parity simulator and digital dynamic simulator
3. Physical phenomenon of hvdc cables and different types of HV DC cables
4. Methodalligies for AC-DC power flow **
Students those who need more marks study fully Late bloomers study ** to get pass
PART-C
1.Compulsory Questions {a case study where the student will have to read and analyse the subject }
*These questions are expected for the exams This may or may not be asked for exams .
All the best....
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SYLLABUS
UNIT I INTRODUCTION
DC Power transmission technology – Comparison of AC and DC transmission – Application of DC transmission – Description of DC transmission system – Planning for HVDC transmission – Modern trends in HVDC technology – DC breakers – Operating problems – HVDC transmission based on VSC – Types and applications of MTDC systems.
UNIT II ANALYSIS OF HVDC CONVERTERS
Line commutated converter - Analysis of Graetz circuit with and without overlap - Pulse number – Choice of converter configuration – Converter bridge characteristics – Analysis of a 12 pulse converters – Analysis of VSC topologies and firing schemes.
UNIT III CONVERTER AND HVDC SYSTEM CONTROL
Principles of DC link control – Converter control characteristics – System control hierarchy – Firing angle control – Current and extinction angle control – Starting and stopping of DC link – Power control – Higher level controllers – Control of VSC based HVDC link.
UNIT IV REACTIVE POWER AND HARMONICS CONTROL
Reactive power requirements in steady state – Sources of reactive power – SVC and STATCOM – Generation of harmonics – Design of AC and DC filters – Active filters.
UNIT V POWER FLOW ANALYSIS IN AC/DC SYSTEMS
Per unit system for DC quantities – DC system model – Inclusion of constraints – Power flow analysis – case study.