Behavior of Combined System of MHD and Steam Turbo-Generator Linked to Transmission System

Abstract

The MHD generator must be integrated into the combined MHD and steam-turbin generation system which consists as topping cycle and steam-turbine system as bottoming cycle. The dc power generated with MHD generator must be transferred into ac power grid through inverter. The present paper treats the electrodynamical aspect of the combined MHD-synchronous generators system.
Some experimental tests and numerical analyses are reported, which studied behavior of MHD generator linked to power transmission line through inverters. Overall electrical behavior of the total binary combined system, however, has not been studied. In the present study, the MHD generator is supersonic or subsonic diagonal type of about 10MW output and is linked to the transmission line by the line-commutated inverter. The synchronous generator is two-poles sylindrical type of 30MW output, while the thermal input is 110MW.
Numerical results show that the present combined system can be stably operated with the rated conditions. When various faults occur in inverter or transmission line, the subsonic and supersonic MHD generators behave differently each other, whereas the transmission line behaves much the same. Some interaction between MHD and Synchronous generators is found. The shoutdowns of the MHD generator and/or faulted line is effective as protective counterplan of faults.