The Study Of EAST Fast Control Power Supply Grey Prediction And PID Control

This subject is mainly devoted to the study of active feedback predictive control for the vertical instability of the plasma in the Tokamak device.The superconducting Tokamak device uses magnetic constraints and vacuum insulation to achieve controlled nuclear fusion,which makes the continuous steady-state of the magnetic constrained position into reality.The high elongation ratio promotes the plasma discharge,but it is a problem that plasma at high bit elongated shape ratio under vertical instability must overcome.EAST fast control power supply vacuum chamber for rapid active feedback coil excitation control to produce a corresponding magnetic field suppressing displacement to maintain the stability of the plasma.However,the active feedback power supply is time-delay control mode,its control effect is unsatisfactory.In order to solve the delay in the application of EAST fast control power supply,the grey prediction which combined with time-varying PID control is proposed.In the course of the experiment,the grey prediction GM(1,1)is used to carry metabolic grey filtering and single-step prediction of active feedback control signal,the feedback measurement value is replaced by the predictive value into the PID control algorithm and the PID control parameters are adjusted by the time-varying calculation formula.Build a simulation model for the feedback control system of fast control power supply based on MATLAB to verify the feasibility of the scheme,and carry out the experiment by using EAST fast control power supply branch controller,it’s main control chip is TMS320F2812 DSP.The results of simulation and experiment verify that the GM(1,1)prediction and time-varying PID control algorithm can realize the forward adjustment and improve the response performance of the active feedback control.