Research And Implementation Of100kV High-Voltage Power Supply Based On PSM Technology

To realize nuclear fusion, auxiliary heating methods must be adopted to heat plasma to more than10keV. As a key component of auxiliary heating system, high-voltage power supply (HVPS) directly affects the heating power and efficiency. J-TEXT is the only medium-sized regular tokamak device in Chinese Universitise. To carry out electron cyclotron resonance heating (ECRH) experiments on J-TEXT, a HVPS is needed to energize the gyrotrons.This paper presents the research and implementation of a100kV/60A HVPS based on pulse step modulation (PSM) technology for the ECRH system on J-TEXT. The detailed works are discussed in following contents:The topology of PSM HVPS used in fusion devices are studied, especially the structure of transformer system and power supply modules. And then the overall topological structure of the HVPS for J-TEXT is designed. In this HVPS,4dry-type transformers with36secondary windings are adopted to drive144series power supply modules and isolate the high voltage, which simplifies the structure and reduces the volume, cost, and short-circuit energy of the entire HVPS. This topological structure is first application in100kV rated HVPS in China, which has important reference value for topology design of HVPS.The design technology of power supply modules for PSM HVPS is well studied. Research on characteristic and optimization of main circuit topology has been carried out. The control and protection of the module has been analyzed in detail. Considering electromagnetic compatibility, heat dissipation and structural layout, the structure of the module has been discussed. Then a750V/60A power supply module has been designed and implemented. Test results show that the designed power supply module performs well and meets the requirements of the HVPS.The control system for PSM HVPS is also studied. A controller based on PXI technology has been developed to operate and monitor all power supply modules. This controller has many advantages, including compact structure, fast response and strong anti-interference. The control system based on PXI controller conforms to the ITER Control, Data Access and Communication (CODAC) standard, which can directly access J-TEXT CODAC system. The proposed PXI controller complements and improves the ITER CODAC design, and may provide a good reference for control system design of PSM HVPS.A control strategy named queue-up PSM improved from the conventional phase-shift PSM is proposed to acquire better dynamic response and stability. Meanwhile, the control algorithm is simpler, which occupies fewer resources of controller. The proposed control strategy has great reference value for control and operation of PSM HVPS.This paper has studied the technologies to design and control a PSM HVPS. And then the100kV/60A PSM HVPS is implemented and tested. Experimental results show that the HVPS performs well and the proposed control strategy can effectively improve the response speed of the PSM HVPS. The designed100kV/60A PSM HPVS satisfies the requirements of ECRH system on J-TEXT.