With the fast-paced changing technologies in the power industry, new power references addressing new technologies are coming to the market. So there is an urgent need to keep track of international experiences and activities taking place in the field of modern unit-commitment (UC) problem. This paper gives a bibliographical survey, mathematical formulations, and general backgrounds of research and developments in the field of UC problem for past 35 years based on more than 150 published articles. The collected literature has been divided into many sections, so that new researchers do not face any difficulty in carrying out research in the area of next-generation UC problem under both the regulated and deregulated power industry.

Unit commitment-a bibliographical survey

Condition monitoring of induction motors is a fast emerging technology for online detection of incipient faults. It avoids unexpected failure of a critical system. Approximately 30-40% of faults of induction motors are stator faults. This work presents a comprehensive review of various stator faults, their causes, detection parameters/techniques, and latest trends in the condition monitoring technology. It is aimed at providing a broad perspective on the status of stator fault monitoring to researchers and application engineers using induction motors. A list of 183 research publications on the subject is appended for quick reference.

A review of stator fault monitoring techniques of induction motors

We consider the point-to-point (approximate) shortest-path query problem, which is the following generalization of the classical single-source (SSSP) and all-pairs shortest-path (APSP) problems: we are first presented with a network (graph). A so-called preprocessing algorithm may compute certain information (a data structure or index) to prepare for the next phase. After this preprocessing step, applications may ask shortest-path or distance queries, which should be answered as fast as possible.Due to its many applications in areas such as transportation, networking, and social science, this problem has been considered by researchers from various communities (sometimes under different names): algorithm engineers construct fast route planning methods; database and information systems researchers investigate materialization tradeoffs, query processing on spatial networks, and reachability queries; and theoretical computer scientists analyze distance oracles and sparse spanners. Related problems are considered for compact routing and distance labeling schemes in networking and distributed computing and for metric embeddings in geometry as well.In this survey, we review selected approaches, algorithms, and results on shortest-path queries from these fields, with the main focus lying on the tradeoff between the index size and the query time. We survey methods for general graphs as well as specialized methods for restricted graph classes, in particular for those classes with arguable practical significance such as planar graphs and complex networks.

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Shortest-path queries in static networks

Methodology for large-scale systems

Review on methods of generation scheduling in electric power systems

The application of fuzzy logic to the unit commitment problem is demonstrated. This method allows a qualitative description of the behavior of a power system, the system's characteristics, and response without the need for exact mathematical formulations. It is demonstrated, through a numerical example, that a fuzzy-logic-based approach achieves a logical and feasible economical cost of operation of the power system, which is the major objective of unit commitment.

A fuzzy logic approach to unit commitment

A multicomponent approach for communicating an understanding of the behavior of an induction machine to undergraduates is presented. In this approach, students set up and perform laboratory tests to determine equivalent-circuit parameters for the machine, develop software to analyze the circuit model, and compare the simulated results with laboratory observations and theoretical expectations. It is shown how such an approach reinforces the student's understanding of both the physical machine and the purpose of equivalent-circuit modeling and simulation in a more general context as well. >

Modeling and analysis of the induction machine: a computational/experimental approach

The fundamental equations governing the operation of a DC motor are straightforward and are well presented in most undergraduate curricula, usually in a required energy conversion or electrical machinery class at the junior level. The physical implications of the equations regarding device behavior, and the need for speed control, are easily understood. Furthermore, students can readily develop a mental picture of the physical motor and its response. Speed control of a DC motor represents an ideal application for introducing the concepts of fuzzy logic. Once the fundamentals of fuzzy logic have been presented to the students, their application to the speed control problem can be easily demonstrated. The paper shows how a commercially available fuzzy logic development kit can be applied to the theoretical development of a fuzzy controller for motor speed, which represents a very practical class of engineering problems.

Fuzzy-logic-based speed control of a shunt DC motor

Guidelines for the selection and operation of bare ACSR conductors with regard to current-carrying capacity

A software package is described for graphically and analytically demonstrating the steady-state behavior of polyphase machines under a variety of operating conditions Implemented in the C language, the program employs sophisticated screen color graphics to show the slow-motion progression of the appropriate voltage or current waves, the loci of the resulting magnetic fields, and the movement of the machine rotor It can be used to dynamically illustrate revolving-field concepts, the use of symmetrical components, and the effects of synchronous machine torque angle and induction machine slip Screen movement can be frozen and significant numerical values displayed at any point during program use The user may specify stator voltages or currents with any degree of unbalance The neutral connection is arbitrary and can be altered during program execution Input data may be specified or altered interactively The program is completely menu-driven and interactive, and contains help commands and instructions which enable it to be used without additional documentation >

H.A. Smolleck

Papers

A fuzzy logic approach to unit commitment

Modeling and analysis of the induction machine: a computational/experimental approach

Fuzzy-logic-based speed control of a shunt DC motor

Guidelines for the selection and operation of bare ACSR conductors with regard to current-carrying capacity

A comprehensive interactive microcomputer capability for demonstrating AC machine operation