Behavior of Two-Pair-Loads Open-Cycle Disk Generator Connected to Power Transmission System

Abstract

This study is carried out as a part of the wide research of large scale MHD generation system. It has been reported in previous works that large-scale disk generators are probably unstable. Recently, we have shown that disk generators become stable under appropriate conditions of both inflow type and multi-loading. In this paper, we design a large-scale open-cycle disk generator to be stable at steady state. The disk generator is operated with subsonic inflow and two pairs of load. A power transmission system is
designed considering to connect the disk generator which has two different power outputs. The proposed transmission network mainly consists of cascade-connected line-commutated inverters, harmonic filters, capacitors for phase modification and double-circuit transmission-lines.
It is found that the performance of the system at steady state is about the same as the designed one and is stable in the region of the inverter control-angle of 130°_??_150°. It is shown that faults in the transmission-line give large fluctuations to the MHD generation system. The control of the inverter angle in addition to cutting off the faulted line is, however, effective to remove the fluctuations.