Smart Grid is aimed to incorporate monitoring, analysis, control and communication capabilities to improve reliability and energy efficiency. However, currently there is no enough sensor to provide information interfa...
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The problem of diagnosing the actuator faults and sensor faults of linear system with the methods of fault detection and isolation (FDI) technology and optimal fault-tolerant observers is addressed. The measurable out...
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Voltage vulnerability has been important in powersystem security research. Considering the characteristic that the voltage are mainly influenced by the reactive power, the potential energy margin which can embody the...
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ISBN:
(纸本)9781424483570
Voltage vulnerability has been important in powersystem security research. Considering the characteristic that the voltage are mainly influenced by the reactive power, the potential energy margin which can embody the impacts from the reactive load, the reactive output of generator, the reactive compensation, and so on, was proposed as the benchmark, and then, the degree index and the trend index of voltage vulnerability were derived, the impacts of grid topology and the reactive power inject ingredients on the voltage vulnerability were discussed. On this base, the assessment index of branch vulnerability was proposed to compute the distance of the current value of branch transmission to the initial value and ascertain the vulnerable area. In IEEE-30bus system, the feasibility and exactness of this method are identified by the simulation.
Smart Grid is aimed to incorporate monitoring, analysis, control and communication capabilities to improve reliability and energy efficiency. However, currently there is no enough sensor to provide information interfa...
详细信息
Smart Grid is aimed to incorporate monitoring, analysis, control and communication capabilities to improve reliability and energy efficiency. However, currently there is no enough sensor to provide information interface for the implementation of smart grid. Therefore, new types of sensors should be deployed to assist the implementation of smart grid. This paper proposes a novel scheme, in which new type of fiber optic sensors (as compared with traditional Farady effect based fiber optic sensor used in powersystem instrumentation) are used to provide multiple types of information for smart grid. The new Fiber Bragg Gratting (FBG) is advantageous in that it can collect variant types of information and can form a sensor network. A transmission line monitoring system with distributed fiber optic senor network is designed, and the procedures to evaluate the status of the overhead transmission line (such as sag, vibration, and galloping) are proposed. A testing setup is built at laboratory, and it is shown that the FBG sensor is capable of obtaining the comprehensive information for evaluating the status of the overhead transmission line.
Voltage vulnerability has been important in powersystem security research. Considering the characteristic that the voltage are mainly influenced by the reactive power, the potential energy margin which can embody the...
详细信息
ISBN:
(纸本)9781424465491
Voltage vulnerability has been important in powersystem security research. Considering the characteristic that the voltage are mainly influenced by the reactive power, the potential energy margin which can embody the impacts from the reactive load, the reactive output of generator, the reactive compensation, and so on, was proposed as the benchmark, and then, the degree index and the trend index of voltage vulnerability were derived, the impacts of grid topology and the reactive power inject ingredients on the voltage vulnerability were discussed. On this base, the assessment index of branch vulnerability was proposed to compute the distance of the current value of branch transmission to the initial value and ascertain the vulnerable area. In IEEE-30bus system, the feasibility and exactness of this method are identified by the simulation.
The problem of diagnosing the actuator faults and sensor faults of linear system with the methods of fault detection and isolation (FDI) technology and optimal fault-tolerant observers is addressed. The measurable out...
详细信息
The problem of diagnosing the actuator faults and sensor faults of linear system with the methods of fault detection and isolation (FDI) technology and optimal fault-tolerant observers is addressed. The measurable outputs used to reconstruct states for the system carry the fault information, which may affect the performance of the system state estimation. In this paper, by comparing the measurable outputs, reliable outputs without fault is selected as the input of the reconstructed system. Then reduced order optimal fault-tolerant observers are used to track the system states. Based on the FDI technology, residual observers are designed to achieve the fault detection for the linear system. Case studies demonstrate the effectiveness of FDI technology and optimal fault-tolerant observers method used in fault detection and isolation.
The analysis of higher order modal interaction attracts much attention from scholars all over the world. The normal form theory and the modal series method offer new ideas for solving these problems. However, literatu...
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The analysis of higher order modal interaction attracts much attention from scholars all over the world. The normal form theory and the modal series method offer new ideas for solving these problems. However, literature review and simulation show that modal analysis for a certain case with these approaches may obtain different results. In this paper, the currently available methods are integrated into a tool PSMAT (powersystem modal analysis tool), so that one can compare the results with different approaches, and then select the most appropriate method for his analysis purpose. The developed tool has all the functionalities in modal analysis as well as the quantitative indices. The design of the tool is described and case studies are presented. The results obtained with this tool are discussed. It is verified that this tool is effective, in both modal analysis and comparison of the approaches.
This paper reports part of the results in the project to develop an on-load de-icing system. In the system, a high frequency high voltage excitation with adjustable frequency, is used to de-ice the ice covered on long...
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This paper reports part of the results in the project to develop an on-load de-icing system. In the system, a high frequency high voltage excitation with adjustable frequency, is used to de-ice the ice covered on long power transmission line. The system is highly efficient in de-icing due to the joint heating effect brought by transmission line loss and dielectric loss. The mathematical model of the system is developed. And on the basis of analysis and numerical simulation results, an adaptive scheme is designed. In the system, networked sensors are deployed to monitor the ice condition on transmission line, and on-line regulate the frequency of the high-voltage excitation according to the monitored ice information, to ensure that there is no severe ice-covering spot on long transmission line.
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