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SYLLABUS

UNIT-I

Introduction to HVDC Transmission HVDC Transmission: Technical and economical comparison of HVAC and HVDC transmission, Types of D.C links, Power handling capabilities of HVDC lines, Static conversion principles, Static converter configuration.

UNIT-II

Static power converter Analysis 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 rectifier, Inverter and HVDC link – Special features of converters.

UNIT-III

Control of HVDC Converter Systems Control of HVDC Converter Systems: Principle of D.C link control – Constant current, Constant extinction angle and constant ignition angle control and voltage dependent current control. Individual phase control and equidistant firing angle control

UNIT-IV

Harmonics and Filters Origin of harmonics in HVDC systems, Classification of harmonics, Elimination of harmonics, Suppression methods, Harmonic instability problems, Design of HVDC A.C and D.C filters.

UNIT-V

Transients, Faults and Protection of HVDC Systems Origin of over voltages in HVDC systems, Over voltages due to D.C and A.C side line faults – Converter faults, Over current protection – Valve group and D.C line protection. Over voltage protection of converters, Surge arresters etc