Research And Design Of The Plasma Current Modulation Power Supply

Inhibition of tear mode instability is an important research topic for the stable operation of tokamak,while the dynamic plasma current modulation is a new theoretical method to alleviate plasma disruption,and a For the future tokamak and fusion reactor The tear mode or even other MHD instability control is a supplement of tearing or other MHD instability control for the future tokamak and fusion reactor.In order to study the effect on suppressiong the tearing mode instability of dynamic plasma current modulation parameters,this paper presents the design scheme and co ntrol methods of current modulation power supply based on J-TEXT heating power supply system.The circulating current caused by paralled inverters was studied.In this paper,through the research and analysis of the topology of high-power fast-acting power supply circuit,the design scheme of current modulation power supply is studied and put forward for the physical requirement of plasma current modulation experiment.The inverter series and parallel circuit,coupled inductors in cyclic symmetry structure and power supply single module design are discussed.In order to realize the normal operation of power supply,the control method of power supply is studied and realized,and the CPS-PWM(carrier phase shift PWM)modulation technique and virtual resistance current sharing control technology are studied emphatically.In order to study the factors that affect the effect of coupling inductor to suppress high frequency circulating current,a mathematical model of circuit topology is established.The stability o f the topology and the characteristics of high voltage utilization are theoretically proved.Compared with the conventional current sharing inductor,the mass and the volume of the coupled inductor are smaller.The possilble maximum circulating current are obtained,and the frequency and amplitude of the high frequency circulating current waveform after being suppressed are analyzed.On this basis,the scheme of suppressing circulating current is determined in order to achieve a reasonable current sharing effect.Under the guidance of the theoretical analysis of this paper,the MATLAB / Simulink simulation model of current modulation power is set up according to the design scheme of the current modulation power supply and the design parameters of the typical working condition.According to the principle of the design scheme,four inverters are developed in parallel.The mathematical model of circuit topology and its analysis conclusion are validated.Simulation and experimental results show that the theoretical analysis of this paper is reasonable,the proposed design and control strategy make the design power supply to meet its performance requirements.The related research results can provide important guidance for the development and operation of current modulation power supply.