Simulation of ohmic heating power suppl Y for HL-2M

Summary form only given. A new conventional magnets tokamak HL-2M (Ip <; 3 MA, Bt = 2.4 T, R = 1.78 m, a = 0.65 m) will be built in Sout hwestern Institute of Physics (SWIP). The Ohmic Heating (O H) power supply feeds the OH coil, which may provide about 220kA. In order to make full use of the flux swing of OH coi l, 4-quadrant converter will be adopted. Both positive and ne gative converters are 12-pulse thyristor bridge and they will b e switched with circulating current to make the current smoot h near zero-crossing point. In order to verify the feasibility of OH power supply design, simulation study based on Simulink is carried out. The simulation focuses on the circuit topology, control mode, line impedance, all kinds of the fault, the bidirectional thyristor crowbar protection and selection of the thysistors. The simulation and analysis results show that the circuit topology is feasible. Output curve is reasonable through optimizing control and circuit parameters. The highest parameters of the power supply are basically the same in each stage.