A control scheme that integrates control technology with communication technology to solve the delay problem is introduced for a class of networked control systems: Networked Half-Link Systems (NHLS). Concretely, we u...A control scheme that integrates control technology with communication technology to solve the delay problem is introduced for a class of networked control systems: Networked Half-Link Systems (NHLS). Concretely, we use the master-slave clock synchronization technology to evaluate the delays online, and then the LQ optimal control based on delays is adopted to stabilize the controlled plant. During the clock synchronization process, the error of evaluated delays is inevitably induced from the clock synchronization error, which will deteriorate the system performances, and even make system unstable in certain cases. Hence, the discussions about the clock error, and the related control analysis and design are also developed. Specifically, we present the sufficient conditions of controller parameters that guarantee the system stability, and a controller design method based on the error of delays is addressed thereafter. The experiments based on a CANbus platform are fulfilled, and the experimental results verify the previous analytic results finally.展开更多
This paper presents the main results on the use of conventional protection hardware to protect a Half Wavelength Transmission Line, or shortly AC-Link, for possible occurrence of three-phase and single-phase fault dur...This paper presents the main results on the use of conventional protection hardware to protect a Half Wavelength Transmission Line, or shortly AC-Link, for possible occurrence of three-phase and single-phase fault during energization maneuver. Lines of these dimensions do not exist today, but in countries of continental size they could be an interesting alternative to HVDC transmission, since the AC-Link has less dependence on Power Electronics technology. The studies on performance and relay settings were implemented using the RTDS real-time simulator. It is important to note that the AC-Link protection for the energization maneuver can be performed with existing hardware on conventional relays.展开更多
在互联网高速发展的背景下,人们对实时通信的速度、稳定性要求不断提升。由于通信电源的运行效率决定了通信系统的运行效率,因此通信电源设计受到业界普遍关注。基于此,研究一种更加高效可靠的通信电源。采用有源功率因数校正(Active Po...在互联网高速发展的背景下,人们对实时通信的速度、稳定性要求不断提升。由于通信电源的运行效率决定了通信系统的运行效率,因此通信电源设计受到业界普遍关注。基于此,研究一种更加高效可靠的通信电源。采用有源功率因数校正(Active Power Factor Correction,APFC)电路+软开关DC/DC变换器两级电路结构,第一级为Boost有源功率因数校正电路,工作模式为CCM模式,可有效降低输入电流的谐波含量;第二级采用半桥逻辑链路控制(Logical Link Control,LLC)谐振变换器,使用谐振电路实现电压稳定输出。展开更多
文摘A control scheme that integrates control technology with communication technology to solve the delay problem is introduced for a class of networked control systems: Networked Half-Link Systems (NHLS). Concretely, we use the master-slave clock synchronization technology to evaluate the delays online, and then the LQ optimal control based on delays is adopted to stabilize the controlled plant. During the clock synchronization process, the error of evaluated delays is inevitably induced from the clock synchronization error, which will deteriorate the system performances, and even make system unstable in certain cases. Hence, the discussions about the clock error, and the related control analysis and design are also developed. Specifically, we present the sufficient conditions of controller parameters that guarantee the system stability, and a controller design method based on the error of delays is addressed thereafter. The experiments based on a CANbus platform are fulfilled, and the experimental results verify the previous analytic results finally.
文摘This paper presents the main results on the use of conventional protection hardware to protect a Half Wavelength Transmission Line, or shortly AC-Link, for possible occurrence of three-phase and single-phase fault during energization maneuver. Lines of these dimensions do not exist today, but in countries of continental size they could be an interesting alternative to HVDC transmission, since the AC-Link has less dependence on Power Electronics technology. The studies on performance and relay settings were implemented using the RTDS real-time simulator. It is important to note that the AC-Link protection for the energization maneuver can be performed with existing hardware on conventional relays.
文摘在互联网高速发展的背景下,人们对实时通信的速度、稳定性要求不断提升。由于通信电源的运行效率决定了通信系统的运行效率,因此通信电源设计受到业界普遍关注。基于此,研究一种更加高效可靠的通信电源。采用有源功率因数校正(Active Power Factor Correction,APFC)电路+软开关DC/DC变换器两级电路结构,第一级为Boost有源功率因数校正电路,工作模式为CCM模式,可有效降低输入电流的谐波含量;第二级采用半桥逻辑链路控制(Logical Link Control,LLC)谐振变换器,使用谐振电路实现电压稳定输出。
