VOLTAGE SOURCE CONVERTER BASED DC SUB TRANSMISSION AND DISTRIBUTION SYSTEM FOR CITY INFEED

Abstract

HVDC utilizes thyristorised converters and inverters for transfer of power from one AC system to another Ac system/loads through single pulse or multipulse per AC cycle. The HVDC systems thus produce huge harmonics and consume very large reactive power for their operation. The requirement of a dynamic DC system has been felt for long to work in tandem for reliable and efficient power system. In this dissertation, a Multi terminal VSC based DC system has been analysed, modeled, simulated and developed for many nodes. A comprehensive mathematical modeling of VSC based converter and inverter system, their link and Multi Terminal system has been done using SIMULINK and SIMPOWERSYSTEM toolbox under MATLAB environment. A control system has been developed for current control of such MTDC converters, inverters, MTDC systems. The dynamic responses of MTDC systems under various operating conditions such as starting,load perturbations etc is presented to demonstrate the effectiveness of the syste...