Realization Of J-TEXT RMP Power Supply Control System Based On LabVIEW

A series of physical experiments related to resonant magnetic perturbation(RMP)on JTEXT are determined by the electrical and physical parameters of RMP power supply system.And the real-time control system of power supplies makes sure that the whole system operating properly and stably.Due to the limited output capacity of DC power supply in the RMP power supply system,the static RMP generated by DC power supply can not meet the higher experimental requirements.In response to the new requirements,a new control system based on LabVIEW platform has been designed for bipolar pulse AC power supply to make it work in DC mode.In addition,magnetic island divertor configuration is being established on J-TEXT to apply magnetic perturbation on plasma edge,so control system framework design of magnetic island divertor power supply also has been accomplished based on the same platform.A new control system has been designed for the bipolar pulse AC power supply based on LabVIEW/FPGA to make it work in DC mode.FPGA has the advantages of high-speed calculation and flexible design in real-time control and data processing,and the development cycle is relatively short,so it is widely used in various special power supplies on tokamak.After analyzing and calculating the topological structure and circuit parameters,PI feedback control strategy was designed and has been adopted in the rectifier part to realize the amplitude control of output current in millisecond level.And output current can be reversed in one shot by switching the inverter IGBTs.The bus resistor branch on the DC bus is flexibly to use to discharge the energy on the capacitance and inductance when the system detects a fault signal.After that,the performance of this control system has been tested,the results show that the output current waveform can track the preset current waveform very well,which verifies the feasibility of DC operation mode on bipolar pulse AC power supplies.In addition,based on the study on control system of bipolar pulse power supply,a new design of the control system for magnetic island divertor power supply prototype has been built up.This power supply adopts a structure of six-pulse rectifier and serial-parallel H-bridge.Carrier phase-shifted SPWM modulation strategy is adopted for H-bridges and IGBTs driving signals are generated in LabVIEW respectively in single H-bridge or serial-parallel H-bridges.As for the control of the output current,a double feedback control method is adopted.In the rectifier part,a PID is adopted to adjust the DC bus voltage to stabilize the input of the inverter,and the inverter part also set a PID to adjust the output current accurately.Then,power supply operation faults are mentioned in the thesis and the faults handling scheme is presented in software level.In conclusion,the operation mode of bipolar pulse AC power supply is upgraded to meet the demand of physical experiment for static RMP in this thesis.And this thesis provides a reference scheme for the programming and debugging of the magnetic island divertor power supply control system in the future.