JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power Systems and Power Electronics

Course Objectives:

• To understand the state-of-the-art HVDC technology.
• To learn the methods to carry out modeling and analysis of HVDC system frontier-area power flow regulation.

Course Outcomes

After completion of the course, students will be able to:

• Expose to the basics of HVDC technology.
• Gain Knowledge of modelling and analysis of HVDC system for inter-area power flow regulation.
• Analyze the converter and dc grid faults and methods to mitigate them.
• Understand the HVDC converter reactive power requirements and identifying the necessary means to address those 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 & AC-DC POWER FLOW ANALYSIS Smoothing reactor and DC Lines, Reactive power requirements, Harmonic analysis, Filter design. Power flow Analysis in AC/DC systems, Modelling of DC links, Solutions of AC-DC Power flow.

TEXTBOOKS:

• 1. J. Arrillaga, “High Voltage Direct Transmission”, Peter Peregrinus Ltd. London, 1983.
• 2. K. R. Padiyar, “HVDC Power Transmission Systems”, Wiley Eastern Ltd., 1990.

REFERENCES:

• 1. E. W. Kimbark, “Direct Current Transmission”, Vol. I, Wiley Interscience, 1971.
• 2. Erich Uhlmann, “Power Transmission by Direct Current”, B.S. Publications, 2004.
• 3. SN.Singh, “Electric Power Generation, Transmission and Distribution, PHI, New Delhi, 2nd Edition, 2008.
• 4. V. Kamaraju, “HVDC Transmission”, Tata McGraw-Hill Education Pvt Ltd, New Delhi, 2011. M. Tech – I Semester L T P C 3 0 0 3