Performance characteristics of artificially commutated HVDC converter

Abstract

Artificially commulated hvdc converter is analysed to obtain the steady state performance characteristics. These are presented in two parts. In part 1. the converter is analysed for thyristor conduction overlap angle less than 60° to evaluate dV/dt, converter impedance and reactive power characteristics under constant output direct current and constant firing angle modes of operation. Non-characteristic harmonics in the ae line cunent arising due to firing imbalance arc also presented.

In part II. the converter is analysed for thyristor conduction overlap angle greater than 60degrees. Operating characteristic reported include thyristor Voltage. di/dt, dv/dt, ac/dc characteristic harmonics, converter impedances, effect of the line capacitive reactance on output dc voltage and power. These are presented to evaluate basic performance and constant output direct current mode of operation.

Comparison of the artificially commuted converter with naturally commutated converter is drawn at each stage to evaluate its suitability.