Development of prototype HVDC transmission system

In this paper, a prototype model of high voltage direct current transmission system is developed using six pulse converter. This consists of two six pulse converters connected through transmission line resistance and smoothing reactor. One converter operates as a rectifier and other as line commutated inverter. The simulation study is carried out using simulation package of PSIM to predict the performance of system under various triggering angle conditions. Different types of triggering schemes are also simulated to see the performance of system. Simulations related with power reversal mode, impact of fault on system are also simulated. A laboratory prototype is developed to validate the simulation results. Thyristor trigger logic is developed and implemented for both converters. The control scheme is implemented using Arduino Uno development board. The system behaviour is validated under normal operating conditions. The converter circuits are developed in such manner that both converters can be used as a twelve pulse converter.