用撬棒快速保护技术保护高功率微波管

介绍了以高压引燃管为核心的撬棒快速保护技术,它用来满足功率直流高压电源(3～30MW/35～100kV)场合下以μs级快速转移微波放大管负载故障电流的需要。通过对负载吸能极限的必要分析和对撬棒回路旁路故障能量的具体计算,选择相应的引燃管串并联方式和抗干扰触发电路,并按核聚变装置中功率速调管的保护要求给出撬棒快速保护技术线路。实验结果表明撬棒回路在32μs内可完全转移高功率微波管的故障电流。     

基于QNX与PLC的HT-7托卡马克DNB电源控制系统的设计

通过可编程序逻辑控制器(PLC)与QNX实时系统相结合实现新的HT-7DNB(中性束诊断)电源控制系统所要求的实时远程控制要求。以现场总线控制层,PLC及QNX6.3.2实时控制层和Windows监控层构成的星型连接局域网实现了上下位不同操作平台间的电源控制系统。从硬件平台选择、软件程序设计、网络设计分析等方面着手,完成了DNB电源实时控制系统的设计与实现。实验表明:该系统实时性良好,性能稳定可靠,各电源时序脉冲误差不超过1 ms,符合HT-7实验要求。     

Experiment and Operation of a LHCD—35kV／2.8MW／1000s High—Voltage Power Supply on HT—7 Tokamak

A-35kV/2.8MW/1000s high-voltage power supply(HVPS) for HT-7 superconducting tokamak has been built successfully.The HVPS is scheduled to run on a 2.45 GHz/1MW lower hybrid current drive(LHCD)^[1] system of HT-7 superoonducting tokamak before the set-up of HT-7 superconducting tokamak in 2003.The HVPS has a series of advantages such as good steady and dynamic response,logical computer program controlling the HVPS without and fault,operationa panel and experimental board for data acquisition.which both are grounded distinctively in a normative way to protec the main body of HVPS along with its attached equipments from dangers.Electric power cables and other control cables are disposed reasonably,to prevent singals from magnetic interference and ensure the precision of signal transfer.This paper involves the experiment and operation of a 35kV/2.8 MW/1000s HVPS^[2] for 2.45 GHz/1 MW LHCD system.The reliability and feasibility of the HVPS has been demonstrated in comparison with experimental results of original design and simulation data.     

Development and Preliminary Commissioning Results of a Long Pulse 140 GHz ECRH System on EAST Tokamak(Invited)

A long pulse electron cyclotron resonance heating(ECRH)system has been developed to meet the requirements of steady-state operation for the EAST superconducting tokamak,and the first EC wave was successfully injected into plasma during the 2015 spring campaign.The system is mainly composed of four 140 GHz gyrotron systems,4 ITER-Like transmission lines,4 independent channel launchers and corresponding power supplies,a water cooling,control &inter-lock system etc.Each gyrotron is expected to deliver a maximum power of 1 MW and be operated at 100-1000 s pulse lengths.The No.1 and No.2 gyrotron systems have been installed.In the initial commissioning,a series of parameters of 1 MW 1 s,900 k W 10 s,800 k W 95 s and650 k W 753 s have been demonstrated successfully on the No.1 gyrotron system based on calorimetric dummy load measurements.Significant plasma heating and MHD instability suppression effects were observed in EAST experiments.In addition,high confinement(H-mode)discharges triggered by ECRH were obtained.     

HT-7 诊断中性束电源控制系统设计

本文介绍了HT-7托卡马克实验装置上研制的基于脉宽调制（PWM）的诊断中性束电源系统的组成、结构和控制需求,以及控制系统的组成和控制功能等。经实际调试与多轮HT-7实验运行,验证了该套电源控制系统的稳定性与可靠性。     

HT-7上中性束诊断系统高压电源充电机特性研究

在HT-7托克马克实验装置上DNB系统实验中,加速机高压电源系统的储能电容器组充电电压有过冲现象,为了能够分析并解决这一问题,详细介绍了该套加速极高压电源系统的组成、结构、工作原理以及初级高压充电电源系统的组成、结构和控制流程等,对实验中的过冲现象行了监测,利用具体的电路模型对初级高压充电电源进行了研究,经过详细的分析和计算,结果表明由于变压器漏抗的影响,使得电容器组上随着充电电压设定的不同有0～6 kV的过冲,因此可以认为变压器漏抗是造成电容器组充电过冲的最主要原因,采用反馈控制和简单的预测控制方式,很好地解决了这一问题.     

CFETR 110 kV电缆接地方案研究

  目的  中国聚变工程实验堆（CFETR）旨在论证稳态燃烧等离子体的工程可行性。站内110 kV高压供配电系统通过电缆等设备为超导磁体电源和无功补偿系统供电，因此高压电缆的稳定工作对实验的开展至关重要。  方法  电缆正常运行需要考虑金属护层感应电势和环流，在对金属护层接地方式充分调研计算后，确定站内110 kV高压XLPE电缆交叉互联接地。利用ANSYS Maxwell软件对三相电缆进行建模，仿真护层感应电压；最后将仿真结果代入Simplorer所构建的等效电路。  结果  其仿真结果显示护层感应电势和环流满足国家标准要求。  结论  为110 kV电缆护层设计的交叉互联接地方案安全可靠，能够确保电缆长期稳定工作。     

基于时分隔离技术的充电模式的研究

时分隔离技术能有效实现对并联蓄电池组的电气隔离,同时可将组合开关电源对并联蓄电池组充电模式改变为脉冲充电。构建了铅酸蓄电池的充电模型,并对恒流充电和脉冲充电两种充电方式进行技术分析和仿真对比,结果表明,脉冲充电较恒流充电能够有效提高充电效率并优化充电性能,为时分隔离技术的推广与使用提供了重要的理论依据。     

基于ITER-PPEN的预制舱载荷分析

预制式电气舱内部结构复杂,外部尺寸较大,将会在法国ITER现场长期使用。根据ITER现场地理位置和自然条件情况,用有限元软件分析和计算了在各种载荷组合工况下,结构的应力值和变形量,验证了此预制式电气舱能够承受所安装设备产生的组合载荷,具备足够的强度,满足室外安装和长期存放的要求。     

三电极气体开关在LHCD高压电源中的应用研究

为在低杂波电流驱动(LHCD)系统打火等严重故障时及时保护高压电源,提出了设置三电极气体开关作为第一级快保护方案,并研制了一套能通流60 k A、5μs快速导通的三电极气体开关。通过联合LHCD高压电源与开关进行短路故障保护实验,证明了开关工作性能稳定,大大提高了LHCD高压电源运行的安全性与可靠性,在脉冲功率装置中具有较好的应用前景。