Advanced fault diagnosis techniques and their role in preventing cascading blackouts
نویسنده
چکیده
Advanced Fault Diagnosis Techniques and Their Role in Preventing Cascading Blackouts. (December 2006) Nan Zhang, B.S., Tsinghua University, China; M.S., Tsinghua University, China Chair of Advisory Committee: Dr. Mladen Kezunovic This dissertation studied new transmission line fault diagnosis approaches using new technologies and proposed a scheme to apply those techniques in preventing and mitigating cascading blackouts. The new fault diagnosis approaches are based on two time-domain techniques: neural network based, and synchronized sampling based. For a neural network based fault diagnosis approach, a specially designed fuzzy Adaptive Resonance Theory (ART) neural network algorithm was used. Several application issues were solved by coordinating multiple neural networks and improving the feature extraction method. A new boundary protection scheme was designed by using a wavelet transform and fuzzy ART neural network. By extracting the fault generated high frequency signal, the new scheme can solve the difficulty of the traditional method to differentiate the internal faults from the external using one end transmission line data only. The fault diagnosis based on synchronized sampling utilizes the Global Positioning System of satellites to synchronize data samples from the two ends of the transmission line. The effort has been made to extend the fault location scheme to a complete fault detection, classification and location scheme. Without an extra data requirement, the new approach enhances the functions of fault diagnosis and improves the performance. Two fault diagnosis techniques using neural network and synchronized sampling are combined as an integrated real time fault analysis tool to be used as a reference of
منابع مشابه
A New Integrated Fault Diagnosis And Analysis System For Large-Scale Power Grid
This paper describes an efficient methodology that can be used in an integrated fault diagnosis and analysis system (IFDAS) for large-scale power grid. The IFDAS extended from some software tools used in contemporary power grid consists of four main parts: fault information processing, fault diagnosis, power gird vulnerability analysis and prediction contingency analysis. It also has some innov...
متن کاملPower Differential based Wide Area Protection
Current differential based wide area protection (WAP) has recently been proposed as a technique to increase the reliability of protection systems. It increases system stability and can prevent large contingencies such as cascading outages and blackouts. This paper describes how power differential protection (PDP) can be used within a WAP and shows that the algorithm operates correctly for a...
متن کاملروشی نوین برای تشخیص خطوط بحرانی با پتانسیل ایجاد خروج های پی درپی در شبکه های قدرت
Abstract: Blackouts are among the main threats to the security of electric power systems. Cascading failures are known as the most important agent for creating blackouts. Transmission lines are the basic equipment of power networks that their outage can make subsequent cascading outages. In this paper, based on the application of decision tree a new approach is proposed for online identificatio...
متن کاملCascading Failure Risk Assessment Considering Protection System Hidden Failures
Cascading failure plays an important role in blackouts. Complex network theory, with the disadvantage of ignoring some of physical features of the power systems, is often utilized to model the cascading failure evolution processes. In this paper, a new risk assessment method based on evolution procedure and dynamic fault trees (DFTs), is proposed to model cascading failures in power systems. DF...
متن کاملMitigating Future Blackouts via Smart Relays: A Machine Learning Approach
As the electric power systems in the United States become increasingly large, complex, and interconnected, the conventional relays and protection systems are proving to be inadequate during some abnormal conditions. In particular, there exists a significant history of relay protection schemes malfunctioning and, ultimately, leading to the infamous system-wide failures, known as electric power b...
متن کامل