DC Power transmission technology – Comparison of AC and DC transmission – Application of DC transmission – Description of DC transmission system – Planning for HVDC transmission – Modern trends in HVDC technology – DC breakers – Operating problems – HVDC transmission based on VSC – Types and applications of MTDC systems.
UNIT II ANALYSIS OF HVDC CONVERTERS
Line commutated converter - Analysis of Graetz circuit with and without overlap - Pulse number – Choice of converter configuration – Converter bridge characteristics – Analysis of a 12 pulse converters – Analysis of VSC topologies and firing schemes.
UNIT III CONVERTER AND HVDC SYSTEM CONTROL
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 – Control of VSC based HVDC link.
UNIT IV REACTIVE POWER AND HARMONICS CONTROL
Reactive power requirements in steady state – Sources of reactive power – SVC and STATCOM – Generation of harmonics – Design of AC and DC filters – Active filters.
UNIT V POWER FLOW ANALYSIS IN AC/DC SYSTEMS
Per unit system for DC quantities – DC system model – Inclusion of constraints – Power flow analysis – case study.
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