摘要: This paper describes an asymmetric control method for the firing angle and a start/stop timing shift control of four thyristor converters called \Booster PS" to minimize the reactive power fluctuation during plasma initiation in JT-60SA. From the simulation using the \PSCAD/EMTDC" code, it is found that these control methods can drastically reduce the reac- tive power induced by the four units of the \Booster PS". In addition, the voltage fluctuation of the motor-generator connected to the \Booster PS" is expected to be suppressed. This can also contribute to achieve stable control of the JT-60SA magnet power supplies.