The Floating nuclear power plant grid is composed of power generation,in-station power supply and external power delivery.To ensure the safety of the nuclear island,the in-station system adopts a special power supply ...The Floating nuclear power plant grid is composed of power generation,in-station power supply and external power delivery.To ensure the safety of the nuclear island,the in-station system adopts a special power supply mode,while the external power supply needs to be adapted to different types of external systems.Because of frequent single phase-ground faults and various fault forms,the fault line selection protection should be accurate,sensitive and adaptive.This paper presents a fault line selection method in cooperation with multi-mode grounding control.Based on the maximum united energy entropy ratio(MUEER),the optimal wavelet basis function and decomposition scale are adaptively chosen,while the fault line is selected by wavelet transform modulus maxima(WTMM).For high-impedance faults(HIFs),to enlarge the fault feature,the system grounding mode can be switched by the multi-mode grounding control.Based on the characteristic of HIFs,the fault line can be selected by comparing phase differences of zero-sequence current mutation and fault phase voltage mutation before and after the fault.Simulation results using MATLAB/Simulink show the effectiveness of the proposed method in solving the protection problems.展开更多
以机器人一体化关节的运动控制为背景,提出了一种低压直流伺服的设计方法。在硬件设计上,突出两大特色:既可驱动直流有刷电机又可驱动直流无刷电机,拓宽了该直流伺服驱动器的应用范围;配备EPA(Ethernet for Plant Automation)实时以太...以机器人一体化关节的运动控制为背景,提出了一种低压直流伺服的设计方法。在硬件设计上,突出两大特色:既可驱动直流有刷电机又可驱动直流无刷电机,拓宽了该直流伺服驱动器的应用范围;配备EPA(Ethernet for Plant Automation)实时以太网通讯接口,通讯速率高且数据传输的确定性和实时性好。在软件设计上,采用三环闭环控制,其中速度环的控制采用先进的单神经元自适应控制,稳定性好,鲁棒性强,实验结果证明该算法有效解决了负载扰动给系统造成的不稳定性。展开更多
基金Project Supported by National Natural Science Foundation of China(No.51877089).Research on the mechanism and fault ride-through integrated strategies of an active power router in hybrid AC and DC distribution grids.
文摘The Floating nuclear power plant grid is composed of power generation,in-station power supply and external power delivery.To ensure the safety of the nuclear island,the in-station system adopts a special power supply mode,while the external power supply needs to be adapted to different types of external systems.Because of frequent single phase-ground faults and various fault forms,the fault line selection protection should be accurate,sensitive and adaptive.This paper presents a fault line selection method in cooperation with multi-mode grounding control.Based on the maximum united energy entropy ratio(MUEER),the optimal wavelet basis function and decomposition scale are adaptively chosen,while the fault line is selected by wavelet transform modulus maxima(WTMM).For high-impedance faults(HIFs),to enlarge the fault feature,the system grounding mode can be switched by the multi-mode grounding control.Based on the characteristic of HIFs,the fault line can be selected by comparing phase differences of zero-sequence current mutation and fault phase voltage mutation before and after the fault.Simulation results using MATLAB/Simulink show the effectiveness of the proposed method in solving the protection problems.
文摘以机器人一体化关节的运动控制为背景,提出了一种低压直流伺服的设计方法。在硬件设计上,突出两大特色:既可驱动直流有刷电机又可驱动直流无刷电机,拓宽了该直流伺服驱动器的应用范围;配备EPA(Ethernet for Plant Automation)实时以太网通讯接口,通讯速率高且数据传输的确定性和实时性好。在软件设计上,采用三环闭环控制,其中速度环的控制采用先进的单神经元自适应控制,稳定性好,鲁棒性强,实验结果证明该算法有效解决了负载扰动给系统造成的不稳定性。
