In this paper,a flexible modular“Tetris”microsatellite platform is studied to implement the rapid integration and assembly of microsatellites.The proposed microsatellite platform is fulfilled based on a sandwich ass...In this paper,a flexible modular“Tetris”microsatellite platform is studied to implement the rapid integration and assembly of microsatellites.The proposed microsatellite platform is fulfilled based on a sandwich assembly mode which consists of the isomorphic module structure and the standard mechanical-electric-data-thermal interfaces.The advantages of the sandwich assembly mode include flexible reconfiguration and efficient assembly.The prototype of the sandwich assembly mode is built for verifying the performance and the feasibility of the proposed mechanical-electric-data-thermal interfaces.Finally,an assembly case is accomplished to demonstrate the validity and advantages of the proposed“Tetris”microsatellite platform.展开更多
子模块控制器(sub-module controller,SMC)的控制保护功能对模块化多电平换流器直流输电(modular multilevel converter based high voltage direct current,MMC-HVDC)的运行有着极大的影响。首先,介绍了子模块与SMC硬件架构,开发调试...子模块控制器(sub-module controller,SMC)的控制保护功能对模块化多电平换流器直流输电(modular multilevel converter based high voltage direct current,MMC-HVDC)的运行有着极大的影响。首先,介绍了子模块与SMC硬件架构,开发调试了基于复杂可编程逻辑器件(complex programmable logic device,CPLD)的SMC控制程序,研究了SMC与其上层控制阀基控制器(valve based controller,VBC)之间的协调控制以及子模块保护策略。最后对子模块进行了稳态的空载、带载实验以及MMC-HVDC物理模拟系统的系统实验,实验结果证明了子模块的性能良好,SMC可以与VBC进行有效通讯并可以对子模块进行有效控制保护以及稳态测试平台的有效性。展开更多
为了降低降压变压器的安装空间及磁饱和等因素给铁路功率调节器(railway static power conditioner,RPC)工程应用及治理效果带来的不利影响,模块化多电平换流器的铁路功率调节器(railway static power conditioner of modular multileve...为了降低降压变压器的安装空间及磁饱和等因素给铁路功率调节器(railway static power conditioner,RPC)工程应用及治理效果带来的不利影响,模块化多电平换流器的铁路功率调节器(railway static power conditioner of modular multilevel converter,MMC-RPC)成为研究热点。但现有的MMC-RPC控制策略没有考虑电力机车实际负荷功率及电流波动特性对MMC各子模块电容电压影响,使其电容电压波动较大。为此,根据电力机车功率及负荷运行特性,采用混合PWM调制策略,既能满足开关损耗低的要求,又能适应电力机车动态运行特性下MMC-RPC各子模块电容均压波动范围。最后,通过仿真和实验结果验证了MMC-RPC输出性能相对传统二电平RPC的优越性,采用的混合PWM调制策略能够使得MMC-RPC适应电力机车实际负荷功率及电流波动特性,各子模块电容均压波动幅值均有效控制在±5%范围内。展开更多
基金supported by the National Natural Science Foundation of China(6210333962073261)+1 种基金Shaanxi Natural Science Basic Research Program(2023-JC-YB-569)the Fundamental Research Funds for the Central Universities。
文摘In this paper,a flexible modular“Tetris”microsatellite platform is studied to implement the rapid integration and assembly of microsatellites.The proposed microsatellite platform is fulfilled based on a sandwich assembly mode which consists of the isomorphic module structure and the standard mechanical-electric-data-thermal interfaces.The advantages of the sandwich assembly mode include flexible reconfiguration and efficient assembly.The prototype of the sandwich assembly mode is built for verifying the performance and the feasibility of the proposed mechanical-electric-data-thermal interfaces.Finally,an assembly case is accomplished to demonstrate the validity and advantages of the proposed“Tetris”microsatellite platform.
文摘子模块控制器(sub-module controller,SMC)的控制保护功能对模块化多电平换流器直流输电(modular multilevel converter based high voltage direct current,MMC-HVDC)的运行有着极大的影响。首先,介绍了子模块与SMC硬件架构,开发调试了基于复杂可编程逻辑器件(complex programmable logic device,CPLD)的SMC控制程序,研究了SMC与其上层控制阀基控制器(valve based controller,VBC)之间的协调控制以及子模块保护策略。最后对子模块进行了稳态的空载、带载实验以及MMC-HVDC物理模拟系统的系统实验,实验结果证明了子模块的性能良好,SMC可以与VBC进行有效通讯并可以对子模块进行有效控制保护以及稳态测试平台的有效性。
文摘为了降低降压变压器的安装空间及磁饱和等因素给铁路功率调节器(railway static power conditioner,RPC)工程应用及治理效果带来的不利影响,模块化多电平换流器的铁路功率调节器(railway static power conditioner of modular multilevel converter,MMC-RPC)成为研究热点。但现有的MMC-RPC控制策略没有考虑电力机车实际负荷功率及电流波动特性对MMC各子模块电容电压影响,使其电容电压波动较大。为此,根据电力机车功率及负荷运行特性,采用混合PWM调制策略,既能满足开关损耗低的要求,又能适应电力机车动态运行特性下MMC-RPC各子模块电容均压波动范围。最后,通过仿真和实验结果验证了MMC-RPC输出性能相对传统二电平RPC的优越性,采用的混合PWM调制策略能够使得MMC-RPC适应电力机车实际负荷功率及电流波动特性,各子模块电容均压波动幅值均有效控制在±5%范围内。
