HT-6M托卡马克等离子体平衡的1MW反馈控制系统

1MW FAST RESPONSE FEEDBACK CONTROL SYSTEM FOR PLASMA EQUILIBRIUM IN THE HT 6M TOKAMAK

针对ＨＴ－６Ｍ托卡马克（它具有无解耦的极向场线圈系统和薄壁真空室），成功地研制出１ＭＷ快响应等离子体平衡反馈控制系统。主电源采用ＧＴＯ直流斩波器。主控采用带微分反馈环节的开关斩控模式。导出了由载流等离子体、薄壁真空室和反馈场磁体所构成的反馈控制系统在Ｂａｎｇ－Ｂａｎｇ控制模式下的系统传递函数及控制模型。系统技术指标达到：电压１ｋＶ，电流１ｋＡ，功率１ＭＷ，频率（１—２）ｋＨｚ，系统电压响应时延＜１２０μｓ。在各种实验条件下，等离子体实际水平位置控制在±３ｍｍ以内，相应的控制精度优于１．５％。

A 1MW fast response feedback control system for plasma equilibrium on the HT 6M tokamak, which has a thin wall vacuum vessel and a poloidal field without decoupling, has been studied and realized successfully. A GTO dc chopper is adopted for the main power supply while the switch mode control with derivative feedback loop is adopted for the main controller. The transfer function and bang bang control mode of the feedback control system are derived and studied for the system, taking account of the current carrying plasma, the thin wall vacuum vessel, the feedback control field magnet, the main power supply and the controller with feedback loop. The system performance parameters obtained are: voltage=1kV, current=1kA, power=1MW, switch frequency from 1 to 20kHz, voltage response time delay<120μs. The horizontal deviation of the controlled plasma is less than ±3mm with a corresponding controllable precision better than 1.5%.