JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power Systems and Power Electronics

Course Objectives:

• to prepare the students to understand the state-of-the-art of HVDC technology.
• to enable the students to model and analyse HVDC systems

Course Outcomes

Students will be able to:

• understand the state-of-the-art of HVDC technology.
• model and analye the HVDC system for inter-area power flow regulation.
• analyze the converter and dc grid faults and adopt methods to mitigate them.
• analyse the HVDC converter reactive power requirements and address the issues.

UNIT - I: GENERAL ASPECTS OF DC TRANSMISSION

Evolution of HVDC transmission, Comparison of HVDC and HVAC systems, Types of DC links, Components of a HVDC system, Valve characteristics, Properties of converter circuits, assumptions,single phase and Three-phase Converters, Pulse number, choice of best circuit for HVDC converters.

UNIT - II: ANALYSIS OF BRIDGE CONVERTER

Analysis of simple rectifier circuits, Required features of rectification circuits for HVDC transmission. Analysis of HVDC converter: Different modes of converter operation, Output voltage waveforms and DC voltage in rectification, Output voltage waveforms and DC in inverter operation, Thyristor/Valve voltages. Equivalent electrical circuit.

UNIT - III: DC LINK CONTROL

Grid control, basic means of control, power reversal, limitations of manual control,Constant current versus Constant Voltage, Desired features of control. Actual control characteristics: Constant-minimum-ignition-angle control,Constant-current control, Constant-extinction-angle control. Stability of control, tap-changer control,Power control and current limits, frequency control.

UNIT - IV: CONVERTER FAULTS & PROTECTION

Converter mal-operations, Commutation failure, Starting and shutting down the converter bridge, Converter protection.

UNIT - V: REACTIVE POWER MANAGEMENT

Smoothing reactor and DC Lines, Reactive power requirements, Harmonic analysis, Filter design

TEXT BOOKS:

• 1. J. Arrillaga, “High Voltage Direct Transmission”, Peter Peregrinus Ltd. London, 1983.
• 2. K. R. Padiyar, “HVDC Power Transmission Systems”, New Age International Publishers, 3rd Edition, 2015.

REFERENCES:

• 1. High Voltage Direct Current Transmission, NPTEL Lectures by Prof. S. N. Singh, https://www.youtube.com/playlist?list=PL4B78E9972172086A R19 M. TECH. EPE/EPS
• 2. E. W. Kimbark, “Direct Current Transmission”, Vol. I, Wiley Interscience, 1971.
• 3. Erich Uhlmann, “Power Transmission by Direct Current”, B.S. Publications, 2004.
• 4. SN Singh, “Electric Power Generation, Transmission and Distribution, PHI, New Delhi 2nd edition, 2008.
• 5. V. Kamaraju, ”HVDC Transmission” Tata McGraw-Hill Education Pvt Ltd,New delhi,2011. R19 M. TECH. EPE/EPS M. TECH. I Year I Sem. (EPE/EPS)