JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power Electronics and Power Systems

Course Objectives:

• To Comprehend the conversion principles of HVDC Transmission
• Analysis of 3, 6, 12 pulse converters, rectifier and inverter operations of HVDC converters
• To identify the different types of Harmonics and reduction by using Filters
• To comprehend interaction between HVAC and DC systems in various aspects
• To appreciate the reliable MTDC systems and protection of HVDC system

Course Outcomes

Upon the completion of this course, the student will be able to

• To find the applications of HVDC transmission in the power system with the acquired knowledge.
• To analyze different converter topologies viz. 3, 6 and 12 Pulse converters and understand it’s control aspects.
• To understand the filter configuration for Harmonics in HVDC systems.
• To appreciate the reliable Multi terminal HVDC system.
• To have knowledge on the Protection of HVDC systems against Transient over voltages and over currents.

UNIT - I

Introduction: General consideration, Power Handling Capabilities of HVDC Lines Basic Conversion principles, static converter configuration.

UNIT - II

Static Power Converters: 3-pulse, 6-pulse, and 12-pulse converters, converter station and Terminal equipment, commutation process, Rectifier and inverter operation, equivalent circuit for converter – special features of converter transformers. Harmonics in HVDC Systems, Harmonic elimination, AC and DC filters.

UNIT - III

Control of HVDC Converters and Systems: Constant current, constant extinction angle and constant ignition angle control Individual phase control and equidistant firing angle control DC power flow control. Interaction between HV AC and DC systems – Voltage interaction Harmonic instability problems and DC power modulation.

UNIT - IV

MTDC Systems & Over Voltages: Series parallel and series parallel systems their operation and control. Over voltages due to disturbances on DC side, over voltages due to DC and AC side line faults.

UNIT - V

Converter Faults & Protection: Converter faults, over current protection – valve group, and DC line protection over voltage protection of converters, surge arresters.

TEXT BOOKS:

• 1. E.W. Kimbark: Direct current Transmission, Wiely Inter Science – New York
• 2. KR Padiyar : High Voltage Direct current Transmission Wiely Eastern Ltd New Delhi – 1992.

REFERENCES:

• 1. J. Arillaga HVDC Transmission Peter Peregrinus ltd. London UK 1983
• 2. E. Uhlman, “Power Transmission by Direct Current”, Springer Verlag, Berlin Helberg. 1985.
• 3. S. Rao, “EHVAC and HVDC Transmission Engineering Practice” Khanna publishers.