In this study,a pulsed,high voltage driven hollow-cathode electron beam sources through an optical trigger is designed with characteristics of simple structure,low cost,and easy triggering.To validate the new design,t...In this study,a pulsed,high voltage driven hollow-cathode electron beam sources through an optical trigger is designed with characteristics of simple structure,low cost,and easy triggering.To validate the new design,the characteristics of hollow-cathode discharge and electron beam characterization under pulsed high voltage drive are studied experimentally and discussed by discharge characteristics and analyses of waveform details,respectively.The validation experiments indicate that the pulsed high voltage supply significantly improves the frequency and stability of the discharge,which provides a new solution for the realization of a high-frequency,high-energy electron beam source.The peak current amplitude in the high-energy electron beam increases from 6.2 A to 79.6 A,which indicates the pulsed power mode significantly improves the electron beam performance.Besides,increasing the capacitance significantly affects the highcurrent,lower-energy electron beam more than the high-energy electron beam.展开更多
Triggering scheme is a significant factor that may influence the process of vacuum arc initiation. In this work, the characteristics of resistance triggering of a pulsed vacuum arc ion source are investigated and comp...Triggering scheme is a significant factor that may influence the process of vacuum arc initiation. In this work, the characteristics of resistance triggering of a pulsed vacuum arc ion source are investigated and compared with the independent pulse generator triggering. The results show that although the resistance triggering method is capable of triggering a vacuum arc ion source by properly choosing the resistance and electric parameters, it inevitably increases the rise time of the arc current. A high speed multiframe camera is used to reveal the transition process o~ arc initiation during one shot. From the images it is conjectured that the lower voltage between the cathode and the anode may be the reason that leads to the lower transition speed of discharge at the moment of arc initiation.展开更多
针对混合微电网集中控制对中央控制器依赖严重、通信需求量大、扰动调节能力差的问题,提出一种微电网中央控制器(microgrid central control,MGCC)参与的分层事件触发控制策略,有效降低分布式集群的冗余通信并减少中央控制器计算负担,...针对混合微电网集中控制对中央控制器依赖严重、通信需求量大、扰动调节能力差的问题,提出一种微电网中央控制器(microgrid central control,MGCC)参与的分层事件触发控制策略,有效降低分布式集群的冗余通信并减少中央控制器计算负担,改进策略可靠性。该策略将控制系统分为2层,其中,设备层为本地控制层,采用分布式协同控制,所设计的本地控制器可就地控制更新输出状态,实现混合微电网的分散自治运行;另外,在控制层建立微电网控制层,引入事件触发策略,协调MGCC获取混合微电网的全局信息,从而向本地控制器发出预定义的调控指令,实现“源网荷储”灵活调度,尤其是应对突发事件而引发的电网振荡。最后,采用Matlab搭建混合微电网模型并进行仿真,利用Stateflow模块实现了事件触发算法,验证控制策略在满足并网/孤岛模式可靠性、稳定性的前提下,系统通信量可降低56.4%。展开更多
针对煤矿井下选择性漏电保护的问题,着重围绕零序功率方向性原理对该问题进行了研究,并结合DSP(Digital Signal Processor)技术给出了一种基于TMS320LF2407A芯片的零序电压、电流相位比较方案。这一方案是通过过零触发电路捕捉零序电压...针对煤矿井下选择性漏电保护的问题,着重围绕零序功率方向性原理对该问题进行了研究,并结合DSP(Digital Signal Processor)技术给出了一种基于TMS320LF2407A芯片的零序电压、电流相位比较方案。这一方案是通过过零触发电路捕捉零序电压、电流的过零点,然后在软件上来比较零序电压、电流之间的相位关系,根据漏电故障支路与非故障支路中零序电压、电流之间相位的不同,从而实现漏电保护的选择性。同时为了验证过零触发电路的可行性,使用电子电路仿真软件Multisim9进行了触发电路的硬件仿真。最后根据选择性漏电保护的实现过程给出了软件设计流程图以及试验数据分析。展开更多
基金supported by National Natural Science Foundation of China(No.12102099)the National Key R&D Program of China(No.2021YFC2202700)the Outstanding Academic Leader Project of Shanghai(Youth)(No.23XD1421700),respectively。
文摘In this study,a pulsed,high voltage driven hollow-cathode electron beam sources through an optical trigger is designed with characteristics of simple structure,low cost,and easy triggering.To validate the new design,the characteristics of hollow-cathode discharge and electron beam characterization under pulsed high voltage drive are studied experimentally and discussed by discharge characteristics and analyses of waveform details,respectively.The validation experiments indicate that the pulsed high voltage supply significantly improves the frequency and stability of the discharge,which provides a new solution for the realization of a high-frequency,high-energy electron beam source.The peak current amplitude in the high-energy electron beam increases from 6.2 A to 79.6 A,which indicates the pulsed power mode significantly improves the electron beam performance.Besides,increasing the capacitance significantly affects the highcurrent,lower-energy electron beam more than the high-energy electron beam.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11105130 and 11475156
文摘Triggering scheme is a significant factor that may influence the process of vacuum arc initiation. In this work, the characteristics of resistance triggering of a pulsed vacuum arc ion source are investigated and compared with the independent pulse generator triggering. The results show that although the resistance triggering method is capable of triggering a vacuum arc ion source by properly choosing the resistance and electric parameters, it inevitably increases the rise time of the arc current. A high speed multiframe camera is used to reveal the transition process o~ arc initiation during one shot. From the images it is conjectured that the lower voltage between the cathode and the anode may be the reason that leads to the lower transition speed of discharge at the moment of arc initiation.
文摘针对混合微电网集中控制对中央控制器依赖严重、通信需求量大、扰动调节能力差的问题,提出一种微电网中央控制器(microgrid central control,MGCC)参与的分层事件触发控制策略,有效降低分布式集群的冗余通信并减少中央控制器计算负担,改进策略可靠性。该策略将控制系统分为2层,其中,设备层为本地控制层,采用分布式协同控制,所设计的本地控制器可就地控制更新输出状态,实现混合微电网的分散自治运行;另外,在控制层建立微电网控制层,引入事件触发策略,协调MGCC获取混合微电网的全局信息,从而向本地控制器发出预定义的调控指令,实现“源网荷储”灵活调度,尤其是应对突发事件而引发的电网振荡。最后,采用Matlab搭建混合微电网模型并进行仿真,利用Stateflow模块实现了事件触发算法,验证控制策略在满足并网/孤岛模式可靠性、稳定性的前提下,系统通信量可降低56.4%。
文摘针对煤矿井下选择性漏电保护的问题,着重围绕零序功率方向性原理对该问题进行了研究,并结合DSP(Digital Signal Processor)技术给出了一种基于TMS320LF2407A芯片的零序电压、电流相位比较方案。这一方案是通过过零触发电路捕捉零序电压、电流的过零点,然后在软件上来比较零序电压、电流之间的相位关系,根据漏电故障支路与非故障支路中零序电压、电流之间相位的不同,从而实现漏电保护的选择性。同时为了验证过零触发电路的可行性,使用电子电路仿真软件Multisim9进行了触发电路的硬件仿真。最后根据选择性漏电保护的实现过程给出了软件设计流程图以及试验数据分析。
