Relay coordination is crucial in electrical power systems to protect against malfunctions and damage caused by unexpected events like short circuits.To address the challenge associated with the reverse direction of fa...Relay coordination is crucial in electrical power systems to protect against malfunctions and damage caused by unexpected events like short circuits.To address the challenge associated with the reverse direction of fault current,dual-setting(DS)directional over-current relays have evolved but failed to provide proper coordination during changes of load,generation,and network.In the meantime,with the increasing number of DS relays,the total relay operating time tends to saturate.Therefore,this paper proposes a protection scheme based on the optimal deployment of conventional and dual-setting rate of change of voltage(DS-ROCOV)relays in distribution systems.This holds true for varying network topologies and is unaffected by variations in load and generation.The objective of the proposed scheme is to ensure reliable and efficient protection against faults in distribution systems by minimizing the overall operating time with the optimal number of DS-ROCOV relays.The proposed protection scheme’s performance is evaluated for different coordination time interval values as well as in different microgrid scenarios.This paper outlines the design and implementation of the proposed protection scheme which is validated on the modified IEEE 14-bus system using simulations in Matlab/Simulink.展开更多
Landslide monitoring is one of the important means to landslide control. In order to do well this job in landslide monitoring work, first in ascertaining the geological conditions, then laying out a variety of profess...Landslide monitoring is one of the important means to landslide control. In order to do well this job in landslide monitoring work, first in ascertaining the geological conditions, then laying out a variety of professional monitoring points. This paper adopts the fuzzy cluster analysis method, and the landslide monitoring points by using fuzzy cluster analysis method, through the calculation of deformation of fuzzy clustering, finally draws the conclusion that the landslide monitoring point classification. The method for the landslide monitoring point optimization, as well as the landslide deformation monitoring plan modification and perfect have very important reference value.展开更多
文摘Relay coordination is crucial in electrical power systems to protect against malfunctions and damage caused by unexpected events like short circuits.To address the challenge associated with the reverse direction of fault current,dual-setting(DS)directional over-current relays have evolved but failed to provide proper coordination during changes of load,generation,and network.In the meantime,with the increasing number of DS relays,the total relay operating time tends to saturate.Therefore,this paper proposes a protection scheme based on the optimal deployment of conventional and dual-setting rate of change of voltage(DS-ROCOV)relays in distribution systems.This holds true for varying network topologies and is unaffected by variations in load and generation.The objective of the proposed scheme is to ensure reliable and efficient protection against faults in distribution systems by minimizing the overall operating time with the optimal number of DS-ROCOV relays.The proposed protection scheme’s performance is evaluated for different coordination time interval values as well as in different microgrid scenarios.This paper outlines the design and implementation of the proposed protection scheme which is validated on the modified IEEE 14-bus system using simulations in Matlab/Simulink.
文摘Landslide monitoring is one of the important means to landslide control. In order to do well this job in landslide monitoring work, first in ascertaining the geological conditions, then laying out a variety of professional monitoring points. This paper adopts the fuzzy cluster analysis method, and the landslide monitoring points by using fuzzy cluster analysis method, through the calculation of deformation of fuzzy clustering, finally draws the conclusion that the landslide monitoring point classification. The method for the landslide monitoring point optimization, as well as the landslide deformation monitoring plan modification and perfect have very important reference value.
