基于PSM技术的脉冲高压电源测量与控制保护系统的EMC设计

EMC design of measurement and control protection system of high voltage pulse power supply based on PSM technology

辅助加热是托卡马克装置实现等离子体自持燃烧的必要手段,各种辅助加热方式均需要高压直流电源为其关键部件供电。目前在我国大型托卡马克聚变装置HL-2A中,为几套辅助加热系统提供高压的均是基于PSM技术的高压电源。结合基于PSM技术的高压电源工作运行环境的特殊性,电源运行中遇到的各种干扰问题,以电磁兼容(EMC)理论为基础,分析干扰源的产生及作用机理。充分考虑屏蔽技术在测量及控制保护系统重要性,根据场源性质采取一定的屏蔽措施。同时结合实际的测量及控制保护设备从硬件和软件采取EMC抗干扰措施,主要包括改善供电电源性能、模拟滤波、软件合理优化控制器上升或下降沿触发,信号采用光纤隔离传输切断干扰回路等。经实际应用证明,合理增加抗干扰设计提高了控制保护系统的可靠性、测量系统波形的保真性。波形真实还原及保护误动作的减少,装置放电效率有了很大幅度的提高。

Auxiliary heating is necessary method to igniting in tokamak devices. All auxiliary heating system requires high-voltage DC power supply as key components to supply power. At present, in the large tokamak fusion device HL-2 A, high-voltage power supplies based on PSM technology are provided for several auxiliary heating systems, the power supplies have following characteristics: high voltage, high precision, low ripple, quick response and so on. Based on the theory of electromagnetic compatibility(EMC) and the particularity of working environment of the high voltage power supply, all kinds of interference problems in the operation of the high voltage power supply are combed out and mechanism of interference sources are analyzed, fully consideration are given for the shielding protection technology in the measurement and control system importance, according to the nature of the interference source. At the same time, EMC anti-interference measures from hardware and software are adopted, it mainly includes improving power supply performance for measurement and control protection system, analog and digital filtering processing, reasonably optimizing the rising or falling edge trigging of the controller, and cutting off the interference loop by optical fiber isolation transmission. It is proved that the reasonable increase of anti-interference design can improve the reliability of control protection system and the authenticity of measurement system waveform. Measurement waveform authenticity and the reduction of protection action mistakenly have greatly improved the discharge efficiency of the device..