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Power Engineering Society Winter Meeting, 2002. IEEE

Date 27-31 Jan. 2002

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  • IEEE Power Engineering Society 2002 Winter Meeting [front matter]

    Publication Year: 2002 , Page(s): 0_1 - xxvi
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  • IEEE trial-use standard 1459-2000, definitions for the measurement of electric power quantities under sinusoidal, nonsinusoidal, balanced, or unbalanced conditions

    Publication Year: 2002 , Page(s): 1421 - 1424
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    First Page of the Article
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  • Panel presentation on experiences as a CAREER awardee [electrical engineering education]

    Publication Year: 2002
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    Summary form only given. The paper examines the authors experiences as a CAREER Awardee. He details how the Award influenced the following aspects of his professional work: integration of teaching and research; encouragement of professional efforts through IEEE by stressing the educational component; and increased the likelihood of collaborations (a received a 3-yr EPRI Grant during the Award). View full abstract»

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  • Author index

    Publication Year: 2002 , Page(s): 1523 - 1527
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    Freely Available from IEEE
  • Source characterization of discharges in transformers using UHF PD signatures

    Publication Year: 2002 , Page(s): 1383 - 1388 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (795 KB) |  | HTML iconHTML  

    UHF patterns of discharges representative of that occurring in a transformer were recorded by simulating them in a 220 kV test tank. The influence of the location of the UHF sensor, type of barrier and partial discharge (PD) magnitude on UHF sensitivity was studied. Information concerning the temporal development of discharges, their location, type and severity were also obtained. Classical PD patterns were recorded alongside for comparison. Experimental studies show that source characterization of discharges is possible when stable discharges can be obtained. The effect of different UHF PD measurement system and signals acquisition parameters on UHF PD detection sensitivity and acquired patterns have been studied and found to have a strong influence. View full abstract»

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  • The application of a DSTATCOM to an industrial facility

    Publication Year: 2002 , Page(s): 725 - 728 vol.2
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (210 KB) |  | HTML iconHTML  

    This paper describes the application of a distribution static VAr compensator (DSTATCOM) to an existing industrial facility for voltage flicker mitigation during the starting of a large motor. Traditional methods are discussed for comparison. The performance of these methods and the DSTATCOM are compared using computer-based modeling. Additionally, the cost and reliability are presented to determine the most viable solution to this or other similar problems. The DSTATCOM performs well, should have acceptable reliability and be cost competitive with other solutions. Clearly, this will become a very powerful power system tool. View full abstract»

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  • State estimation for mega RTOs

    Publication Year: 2002 , Page(s): 1449 - 1454 vol.2
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    Control and operation of electric power system is based on the ability to determine the state of the system in real time. State estimation has been introduced in the 60s to achieve this objective. The initial implementation was based on single phase measurements and a power system model that is assumed to operate under single frequency, balanced conditions and symmetric system model. These assumptions are still prevelant today. The single frequency, balanced and symmetric system assumptions have simplified the implementation but have generated practical problems. The experience is that the state estimation (SE) problem does not have 100% performance, i.e. there are cases and time periods that the SE algorithm will not converge. There are practical and theoretical reasons for this and they are explained in the paper. Mergers and mandated RTOs as well as announcements for formation of mega RTOs will result in the application of the SE in systems of unprecedented size. We believe that these practical and theoretical issues will become of greater importance. There are scientists that believe that the SE problem is scalable meaning that it will work for the mega RTOs the same way as it performs now for medium-large systems. There are scientists that they believe this is not true. The fact of the matter is that no-one has investigated the problem, let alone perform numerical experiments to prove or disprove any claims. This paper identifies a number of issues relative to SE of mega RTOs. These issues are discussed on a theoretical basis. The paper also calls for numerical experiments that will provide answers to these questions. View full abstract»

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  • Analysis and control of DSTATCOM for a line voltage regulation

    Publication Year: 2002 , Page(s): 729 - 734 vol.2
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (427 KB) |  | HTML iconHTML  

    This paper describes a modeling and AC voltage direct control techniques of distribution static synchronous compensator (DSTATCOM) using EMTDC/PSCAD package. Moreover, a model of a three-phase four-wire real distribution system is presented and applied to a model of a DSTATCOM using EMTDC. Using AC voltage direct control, low harmonics and offset in the voltage as well as fast dynamic responses are achieved. The derived simulations are tried to verify the result of this paper. View full abstract»

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  • Online voltage stability contingency selection using improved RSI method based on ANN solution

    Publication Year: 2002 , Page(s): 888 - 892 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (106 KB) |  | HTML iconHTML  

    This paper proposed an efficient methodology for voltage stability contingency selection, named improved RSI method based on ANN solution. The basic idea of the reactive support index (RSI) method is adopted, while the artificial neural network (ANN) solution is employed to handle the nonlinear relationship between the RSI and the voltage stability margin variation. The improved methodology combines the advantages of its clear physical meaning from the RSI method and its high accuracy from using the ANN. The method is tested on the IEEE 39 buses test system. Numerical studies illustrate that the new method has good performance on both the accuracy and speed. View full abstract»

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  • Active current balance between parallel thyristors in multi-bridge AC-DC rectifiers

    Publication Year: 2002
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    Summary form only given as follows. New technology in digital excitation control provides a method to balance thyristor currents in parallel power rectifier bridges that provide current to a synchronous generator field. Balancing current between parallel bridges feeding a common load has traditionally been accomplished by using current balancing transformers in each bridge or adding inductance in series with the thyristors or SCRs (silicon controlled rectifiers). This paper introduces active current balance, a new technique which modifies the average current in parallel leg thyristors to facilitate current balance between the bridges. This is accomplished by periodically inhibiting the firing of thyristors that carry more than the average current. The thyristors that are fired carry more current during this interval, increasing their average current. The thyristors that are not fired do not carry current during this interval and thus their average current is reduced. Using this technique (referred to in this paper as "skip firing"), the average current in parallel legs can be adjusted through feedback and control to equalize the average thyristor current loading. Additional feedback and control parameters are proposed, such as heat-sink temperatures, which can be measured and utilized to program the "skip firing", in order to balance thyristor heat-sink temperatures. View full abstract»

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  • Network reconfiguration for service restoration in shipboard power distribution systems

    Publication Year: 2002
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    Summary form only given, as follows. The electric power systems of US Navy ships supply energy to sophisticated systems for weapons, communications, navigation and operation. Circuit breakers (CBs) and fuses are provided at different locations for isolation of faulted loads, generators or distribution system from unfaulted portions of the system. These faults could be due to widespread system faults resulting from battle damage or material casualties of individual loads or cables. After the faults and subsequent isolation of the faults, there will be unfaulted sections that are left without supply. Fast restoration of supply to these unfaulted sections of the shipboard power system is necessary for system survivability. This paper presents a new method to reconfigure the network to restore service to unfaulted sections of the system. The problem is formulated as a variation of the fixed charge network flow problem. The method is illustrated using various case studies on a small power system with a similar topology to a shipboard power system. View full abstract»

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  • The future of distribution systems in the deregulated environment: opportunities and challenges

    Publication Year: 2002
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    Summary form only given. In the past, distribution systems have not received as much attention as generation and transmission systems. Restructuring of the electric utility industry is causing widespread changes in the power distribution sector. The growing needs of individual customers and the innovative technologies being developed to meet such requirements coupled with regulatory supervision are the driving forces that are bringing about a new revolution in distribution systems. In the first part of this paper, the changes taking place due to deregulation will be delineated. The second part focuses on identifying opportunities and challenges resulting from these changes. View full abstract»

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  • The renewal of the Sylmar Converter Station

    Publication Year: 2002 , Page(s): 1063 - 1065 vol.2
    Cited by:  Papers (5)
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    This paper presents some of the considerations that went into the decision to replace and re-configure the 1600 MW Sylmar Converter Station of the the Southern Terminal of Pacific DC Intertie (PDCI), USA. View full abstract»

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  • Decentralized load frequency control for load following services

    Publication Year: 2002 , Page(s): 1252 - 1257 vol.2
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (272 KB) |  | HTML iconHTML  

    This paper proposes a decentralized controller for the load frequency control operated as a load following service. Decentralization is achieved by developing a model for the interface variables, which consist of frequencies of other subsystems. To account for the modeling uncertainties, a local Kalman filter is designed to estimate each subsystem's own and interface variables. The controller uses these estimates, optimizes a given performance index, and allocates generating units's outputs according to a deregulation scenario. Two test systems are given to illustrate the proposed methodologies. View full abstract»

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  • On-line evaluation of power system stability by use of SMES

    Publication Year: 2002 , Page(s): 900 - 905 vol.2
    Cited by:  Papers (2)
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    A new usage of superconducting magnet energy storage (SMES), that is, on-line evaluation of dynamic stability of a power system, is proposed. This paper shows the possibility of the proposed usage of SMES using an analog type power system simulator and a model SMES. The SMES, which is installed for power system stabilization, for example, can give a small continuous power modulation of known pattern with only a small influence on power system operating conditions. At the same time, the SMES can suppress the power oscillation by its power stabilizing control. Experimental results show that the dynamic stability margin of the power system can be evaluated by monitoring the small power oscillation of line power or generator output due to the SMES power modulation. View full abstract»

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  • Distribution system outage and restoration analysis using a wireless AMR system

    Publication Year: 2002 , Page(s): 871 - 875 vol.2
    Cited by:  Papers (3)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (485 KB) |  | HTML iconHTML  

    The advances in computer applications and technology are providing more and more data about the distribution system that can be used for analysis. One new technology is automated meter reading (AMR) systems. AMR systems provide access to the consumption and status of individual customers. This summary outlines research work to incorporate AMR information in outage management The first technique combines AMR data with SCADA and trouble call data to identify an outage and then uses AMR polling to verify the outage and its level. The second technique provides a way to use AMR to confirm restoration of all customers below an outaged device. View full abstract»

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  • Improving outage restoration efforts using rule-based prediction and advanced analysis

    Publication Year: 2002 , Page(s): 866 - 869 vol.2
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (412 KB) |  | HTML iconHTML  

    Electric distribution companies are faced with increasing pressure to more effectively manage outages regardless of their source or nature. In pursuit of cost effective solutions, distribution owners/operators turn to decision-malting and process automation through information technology in the form of outage management systems (OMS). The foundation behind outage management systems is the accurate customer-to-electrical service model and reliable prediction of outage locations. This paper discusses the analysis techniques supporting outage management systems relevant to outage predictions, feeder reconfiguration, cold load pick-up, and the effect this has on operations management. View full abstract»

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  • Economic cost of non-supply

    Publication Year: 2002 , Page(s): 959 - 962 vol.2
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (411 KB) |  | HTML iconHTML  

    Considerable attention has been directed throughout the world to assessing the economic consequences to electric energy customers of failures in electricity supply. The primary thrust in these studies has been to obtain a quantitative appreciation of the worth of electric energy supply in order to create a balance between reliability cost and reliability worth. The cost of an interruption from the customer's perspective is related to the nature of the degree to which the activities interrupted are dependent on electricity. In turn, this dependency is a function of both customer and interruption characteristics. The impact of an outage is also partially dependent on the attitude and preparedness of customers, which in turn are related to existing reliability levels. Issues that can be important include how widespread is the interruption; its cause; and its predictability. View full abstract»

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  • Multi-terminal HVDC as enabling technology of premium quality power park

    Publication Year: 2002 , Page(s): 719 - 724 vol.2
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (255 KB) |  | HTML iconHTML  

    Subtransmission and distribution systems in large cities are often served by underground cable systems. Because of the compactness and the reduced cost of DC cable transmission lines, a multi-terminal HVDC system based on IGBT voltage source converters (VSCs) can be an attractive alternative to an AC cable system. This paper draws attention to the added value which comes from the capability of multi-terminal HVDC (VSC-M-HVDC) system to ensure uninterrupted quality power to sensitive loads. The value of premium quality power park obtainable from a VSC-M-HVDC system should enhance its attractiveness. View full abstract»

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  • An improved neural network algorithm for classifying the transmission line faults

    Publication Year: 2002 , Page(s): 918 - 923 vol.2
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (412 KB) |  | HTML iconHTML  

    This study introduces a new concept of artificial intelligence based algorithm for classifying the faults in power system networks. This classification identifies the exact type and zone of the fault. The algorithm is based on unique type of neural network specially developed to deal with a large set of highly dimensional input data. An improvement of the algorithm is proposed by implementing various steps of input signal preprocessing, through the selection of parameters for analog filtering, and values for the data window and sampling frequency. In addition, an advanced technique for classification of the test patterns is discussed and the main advantages compared to previously used nearest neighbor classifier are shown. View full abstract»

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  • Electricity price forecasting models

    Publication Year: 2002 , Page(s): 963 - 966 vol.2
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1176 KB) |  | HTML iconHTML  

    This paper proposes that the price of electricity should be parsed into two components: energy price and "reliability price". From the supply point of view, in addition to the energy price, there is a cost associated with reliability, or continuity of supply. This cost, which differs from other commodities, arises because electricity cannot be stored. From the demand point of view for some customers electricity is an essential commodity, while other customers may want a choice of how much reliability they are willing to pay for. If customers have the options of interruptible rates or curtailable rates, or perhaps the option of limiting demand upon receipt of a signal from the control center, then they can consume energy but not reliability, or they can only partially consume reliability. Furthermore suppliers can reduce supply costs if they can reduce demand. In the long term, reduced demand reduces the need for generation capacity. Over the short term, demand reduction that is under the control of the dispatch center can reduce the demand for ancillary services. View full abstract»

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  • 2001 performance of New York ISO demand response programs

    Publication Year: 2002 , Page(s): 995 - 998 vol.2
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (156 KB) |  | HTML iconHTML  

    In 2001, the New York Independent System Operator implemented two programs aimed at increasing the opportunities for interruptible load and standby generation to participate in the New York wholesale electricity market. One program allows demand side resources to reduce load or start up standby generators when an operating reserves deficiency exists. The second program permits demand side resources to bid load reduction into the day-ahead energy market and receive compensation for actual load reduction provided. The paper discusses the performance of both programs during the summer of 2001 and outlines future efforts in this area. View full abstract»

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  • Mechanism of lightning damage on low voltage distribution equipment due to arc current

    Publication Year: 2002 , Page(s): 795 - 799 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (511 KB) |  | HTML iconHTML  

    The lightning damage on low voltage power distribution systems is almost a burning of low voltage distribution equipment due to a flashover and arc dynamic or short circuit current. The lightning overvoltage causes a flashover in low voltage distribution equipment. After that, the flashover causes burning because of impressing the commercial frequency voltage. The authors conducted two kinds of experiments. The first was using low voltage distribution equipment. The second was using a real scale low voltage distribution line model. According to the first experiment, the authors suggest that the flashover current due to lightning overvoltage becomes 0 A at once when the flashover current switches to the arc dynamic current. In the second experiment, a lightning overvoltage causes burning of equipment on a low voltage power distribution system. As a result, it became possible to know the equipment burnt on a low voltage distribution system. View full abstract»

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  • Preliminary design analysis of tie-line bias control of reactive power

    Publication Year: 2002 , Page(s): 1258 - 1263 vol.2
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (229 KB) |  | HTML iconHTML  

    Generator output and reactive power controls must respond to system disturbances, including changes in system loads and loss of generators or tie lines. This paper describes a novel approach to voltage and reactive power control (VQC) called reactive tie-line bias control (Q-TBC) that is analogous to the tie-line bias control often used for load frequency control (LFC). The Q-TBC regulates a pilot voltage and reactive tie-line flows of a reactive control area by switching capacitors and reactors. A simulation model, which includes both LFC and VQC, has been developed. Sample simulation results show the impact of the Q-TBC on tie-line reactive power flow and bus voltage. View full abstract»

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  • Operating power system under reduced generation availability

    Publication Year: 2002 , Page(s): 1400 - 1404 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (64 KB) |  | HTML iconHTML  

    Operating power system under reduced generation availability is a situation where the electricity generation capacity is inadequate to meet the load demand. The reduced generation could be the result of less available generating capacity, or inoperable capacity or unavailable capacity due to maintenance outages, or forced outages. The service of maintaining real time balance between generation and load is performed by load following that is one six specified Ancillary Services under Federal Energy Regulatory Commission's (FERC) 1996 Order No. 888. Without Load Following service, other service in particular Regulation does this function. Regulation is one of the other Ancillary Services that the transmission providers must provide. View full abstract»

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