Voltage DC Transmission|
DC power transmission technology: Introduction, comparison of AC and DC transmission, application of DC transmission, application of DC transmission, description of DC transmission system, Configurations, planning for HVDC transmission, modern trends in DC transmission. Introduction to Device: Thyristor valve, valve tests, recent trends.
Analysis of HVDC converters: Pulse number, choice of converter configuration, simplified analysis of graetz circuit, converter bridge characteristics, characteristics of a twelve-pulse converter, detailed analysis of converters with and without overlap.
Converter and HVDC system control: General, 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, telecommunication requirements.
Converter faults and protection: Introduction, converter faults, protection against over-currents, over-voltages in a converter station, surge arresters, protection against over-voltages.
Smoothing reactor and DC line: Introduction, smoothing reactors, DC line, transient over voltages in DC line, protection of DC line, DC breakers, Monopolar operation, effects of proximity of AC and DC transmission lines.
Reactive power control: Introduction, reactive power requirements in steady state, sources of reactive power, static var systems, reactive power control during transients. Harmonics and filters: Introduction, generation of harmonics, design of AC filters, DC filters, carrier frequency and RI noise.
Component models for the analysis of ac/dc systems: General, converter model, converter control, modelling of DC network, modelling of AC networks.
Power flow analysis in AC/DC systems: General, modelling of DC links, solution of DC load flow, discussion, per unit system for DC quantities, solution techniques of AC-DC power flow equations.