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03678 Network programming technique for unit commitment
06
Electric
power
generation
and
utilisation
(scientific,
technical)
95/03670 Improving the quality of an optlmal power flow solutlon by Teguchl method Bounou, M. el al., Elect. Power & Energy Sysrems, 1995, 17, (2), 113-118. The Paper aims at improving the quality of an OPF (optimal power flow) solution including power demand uncertainty. The goal is to obtain a best setting of the in$t which results in a performance characteristic of the output close to target with minimum variability. Here, a post-optimality orocedure which incoruorates the ohilosoohv and the method of Taeuchi is applied. Power demand variabilit): is in&did in the analysis by &ans of the expected value of a loss function which is estimated by the Taguchi orthogonal arrays approach. The best and least sensitive solution over uncontrollable power system variability is selected by means of signal-tonoise ratios. Tlie paper-overviews the ‘aguchi approach and illustr%es the application of the method IO improve the ‘quality’ of an OPF involving the IEEE 14-bus network. I
95103671 individual room control with the European Installation Bus EIB Baumearth. S. Sanir. Heiz. Tech.. Jan. 1995, 60. (1). 74-79. (In German) Disc&es the changes to electricit; supply and co&oi of building service; installations with the introduction of the European Installation Bus EIB and the incorporation of addressable controllers and sensors. The Industrial application of phase current analysis 95103672 to detect rotor winding faults in squirrel cage induction motors Rankin, D. R. Power Engng. .I., Apr. 1995, 9, (2), 77-84. Three-ohase induction motors are bv far, the most common mime mover in industiy today. Many of these mot&s, which may be as large as 25MW, are used in critical duties in industries such as oil, petrochemical, utilities, paper, mining and steel manufacture where sudden failure of a machine can have a drastic effect on production as well as safety implications. Prevention of failures is vital. The article describes the seven-year development of an online knowledge-based software program to detect rotor winding faults and mechanical load influences. Investigation of the commutator quality of electric 95103673 traction motors by means of the transformation method Poliak, J. Electric Power Systems Res., Feb. 1995, 32, (2). 129-131. The reliabilitv of contemoorarv traction dolors and the factors which have an effect on ihem are st;died’in this paper. The centre of interest of the article is the description of the transformation method of determining the quality of a commutator, the substance of which consists in picking uj the current between brushes of the same olarity with the simultaneous gradual rotation of the armature through 36 & while feeding the main poles with alternating voltage. 95103674 Learnina coordinated control of Dower svatems -, using Interconnected learnlng automata Wu, Q. H. Elect. Power & Energy Sysrems, 1995, 17, (2), 91-99. The paper is concerned with appli&tion of interconnected.Iearning automata to learning coordinated control (LCC) of power systems. The jnterconnetted learning automata with variable subsets of control actions are used to optimize parameters of distributed local controllers to improve power system stability based on an integrated performance index. Simulation studies have been carried out based on a detailed mathematical model of a four-machine power system. Results obtained from simulation studies are presented to show a potential of applications of the method to control of large-scale systems. 95103675 Lighting. An Introduction to light, lighting and light use Turner, J. Barsford, 1994, 144~~. The books explains lighting design, exemplified by practical examples, case studies and numerous photographic illustrations. 95103676 Machine learnlng and knowledge building for fault diagnosls In distribution network Teo, C. Y. Elect. Power & Energy Systems, 1995, 17, (2), 119-122. A fault diaenosis svstem for distribution networks usine machine learning of fault paytern is’described. The learning process ca’n be implemented during fault condition on the actual network or through a distribution network simulator. Knowledge acquisition is almost automated. The proposed system can be integrated into the existing SCADA system to provide a guide for engineers during fault conditions. 95103677 Nakahawa,
Molten salt corrosion K.
Fushoku
Boshoku
in power plants
Bumon
linkai
Kenkyushukai
Shiryo,
1994, 43, 15-28. (In Japanese) For the research of molten salt corrosion in superheating pipes of ultrahigh pressure and high temperature units for coal‘plants, r&eating pipes, and materials for fabricating fused carbonate fuel cells, ootimal test methods for these plants were d&eloped and the effect of ambiknt gas composition and molten salt composition on corrosion was investigated. At ihe same time electrochemical methods were used for the study of the molten salt corrosion and mechanism of the corrosion was investigated.
266
Fuel and Energy Abstracts
July 1995
95103679 commitment
Network
Zhu, R. el al.,
Elect. Power
programmlng
technique
for
unlt
Syslems, 1995, 17, (2), 123-127.
& Energy
In this paper, a new approach for short-term unit commitment is roposed. The unit commitment problem is formulated as a network pro g Iem and solved by a network programming technique. The proposed algorithm has been tested on a system of up to 61 units to be scheduled over 24 hours. Experimental results show that this algorithm can obtain a satisfactory solution in 46.51 seconds on a VAX 111750 computer.
95103679 Optimal step-by-step restoration of distribution systems during excessive loads due to cold load pickup I_;;_kI,2i. and Pahwa, A.
Electric
Power Systems Res., Feb. 1995, 32, (2).
Restoration of a distribution system following extended outages may cause problems if the substation transformer capacity cannot supply the initial load. Excessive initial load is a result of loss of diversity in the distribution system. Dividing the system into sections and restoring these sections step by step is one of the solutions to overcome excessive load due to cold load pickup. In step-by-step restoration, the order of restoration of sections becomes an important factor in increasing the reliability and decreasing the average customer interruption duration. In this paper, step-by-step restoration of a distribution system to utilize transformer capacity to the maximum extent and to minimize the customer interruption duration is studied.
95103660 techniques
Power
factor
measurement
and
correction
Prasanna Kumar, C. S. er al., Elecrric Power Systems Res., Feb. 1995, 32, (2), 141-143. The prevailing method of power factor measurement is debatable. Certain methods are suggested in this paper with hints IO improve power factor measurement and correction.
95103681 systems Zhou, E. Z.
Power
oscillation
Elect. Power
& Energy
flow
study
of electric
power
Systems, 1995, 17, (2), 143-150.
An algorithm to compute power oscillation flow of electric power systems has been developed and presented. For a mode(s) of concern in a power svstem. the relative maenitudes and ohase aneles of Dower oscillation flow o> transmission lines in’the oscillatibn roce& can Le calculated. Also the contribution of each machine and each Poad in the system to the oscillation flow can be determined. In large scale interconnected power systems and for interarea oscillation modes, where hundreds of machines may participate in the oscillation, power oscillation flow analysis of tie-lines may provide more clear pictures of the oscillation than those obtained by other available methods.
95103662 A predictive power system stabilizer Saidy, M. and Hughes, F. M. (2), 101-111.
Integrated
/
Elecr. Power
voltage & Energy
regulator
and
Sysrems, 1995, 17,
An integrated voltage regulator and power system stabilizer based on one step ahead prediction is presented. The fixed parameter predictive control scheme is shown capable of providing consistently good voltage response and contribution to system damping over a wide range of operating conditions and system configuration. This is in contrast to the case with conventional automatic voltage regulator and power system stabilizer where performance varies widely with the operating situation and can even cause system instability.
Real-time assessment of a symmetrical 95103663 and microcontroller bas?d distance relay Waikar, D. L. 107-112.
ef al.,
Elecrric
Power
component
Sysrems Res., Feb. 1995, 32, (2),
The paper presents the design, implementations and real-time assessment of a nucrocontroller based digital distance relay that can be used for the protection of power transmission lines. The proposed design is implemented using a general-purpose Intel 8097 microcontroller and custommade filters, operational amplifiers, sample-and-hold amplifiers, multiplexers, and analog-to-digital converters. The relay software is based on a computationally efficient symmetrical component based fault distance estimation algorithm. Results of the performance assessment studies on this algorithm have shown promising fault distance estimates for first-zone faults on the protected transmission line.
Electric
power
generation
and
utilisation
(scientific,
technical)
95/03670 Improving the quality of an optlmal power flow solutlon by Teguchl method Bounou, M. el al., Elect. Power & Energy Sysrems, 1995, 17, (2), 113-118. The Paper aims at improving the quality of an OPF (optimal power flow) solution including power demand uncertainty. The goal is to obtain a best setting of the in$t which results in a performance characteristic of the output close to target with minimum variability. Here, a post-optimality orocedure which incoruorates the ohilosoohv and the method of Taeuchi is applied. Power demand variabilit): is in&did in the analysis by &ans of the expected value of a loss function which is estimated by the Taguchi orthogonal arrays approach. The best and least sensitive solution over uncontrollable power system variability is selected by means of signal-tonoise ratios. Tlie paper-overviews the ‘aguchi approach and illustr%es the application of the method IO improve the ‘quality’ of an OPF involving the IEEE 14-bus network. I
95103671 individual room control with the European Installation Bus EIB Baumearth. S. Sanir. Heiz. Tech.. Jan. 1995, 60. (1). 74-79. (In German) Disc&es the changes to electricit; supply and co&oi of building service; installations with the introduction of the European Installation Bus EIB and the incorporation of addressable controllers and sensors. The Industrial application of phase current analysis 95103672 to detect rotor winding faults in squirrel cage induction motors Rankin, D. R. Power Engng. .I., Apr. 1995, 9, (2), 77-84. Three-ohase induction motors are bv far, the most common mime mover in industiy today. Many of these mot&s, which may be as large as 25MW, are used in critical duties in industries such as oil, petrochemical, utilities, paper, mining and steel manufacture where sudden failure of a machine can have a drastic effect on production as well as safety implications. Prevention of failures is vital. The article describes the seven-year development of an online knowledge-based software program to detect rotor winding faults and mechanical load influences. Investigation of the commutator quality of electric 95103673 traction motors by means of the transformation method Poliak, J. Electric Power Systems Res., Feb. 1995, 32, (2). 129-131. The reliabilitv of contemoorarv traction dolors and the factors which have an effect on ihem are st;died’in this paper. The centre of interest of the article is the description of the transformation method of determining the quality of a commutator, the substance of which consists in picking uj the current between brushes of the same olarity with the simultaneous gradual rotation of the armature through 36 & while feeding the main poles with alternating voltage. 95103674 Learnina coordinated control of Dower svatems -, using Interconnected learnlng automata Wu, Q. H. Elect. Power & Energy Sysrems, 1995, 17, (2), 91-99. The paper is concerned with appli&tion of interconnected.Iearning automata to learning coordinated control (LCC) of power systems. The jnterconnetted learning automata with variable subsets of control actions are used to optimize parameters of distributed local controllers to improve power system stability based on an integrated performance index. Simulation studies have been carried out based on a detailed mathematical model of a four-machine power system. Results obtained from simulation studies are presented to show a potential of applications of the method to control of large-scale systems. 95103675 Lighting. An Introduction to light, lighting and light use Turner, J. Barsford, 1994, 144~~. The books explains lighting design, exemplified by practical examples, case studies and numerous photographic illustrations. 95103676 Machine learnlng and knowledge building for fault diagnosls In distribution network Teo, C. Y. Elect. Power & Energy Systems, 1995, 17, (2), 119-122. A fault diaenosis svstem for distribution networks usine machine learning of fault paytern is’described. The learning process ca’n be implemented during fault condition on the actual network or through a distribution network simulator. Knowledge acquisition is almost automated. The proposed system can be integrated into the existing SCADA system to provide a guide for engineers during fault conditions. 95103677 Nakahawa,
Molten salt corrosion K.
Fushoku
Boshoku
in power plants
Bumon
linkai
Kenkyushukai
Shiryo,
1994, 43, 15-28. (In Japanese) For the research of molten salt corrosion in superheating pipes of ultrahigh pressure and high temperature units for coal‘plants, r&eating pipes, and materials for fabricating fused carbonate fuel cells, ootimal test methods for these plants were d&eloped and the effect of ambiknt gas composition and molten salt composition on corrosion was investigated. At ihe same time electrochemical methods were used for the study of the molten salt corrosion and mechanism of the corrosion was investigated.
266
Fuel and Energy Abstracts
July 1995
95103679 commitment
Network
Zhu, R. el al.,
Elect. Power
programmlng
technique
for
unlt
Syslems, 1995, 17, (2), 123-127.
& Energy
In this paper, a new approach for short-term unit commitment is roposed. The unit commitment problem is formulated as a network pro g Iem and solved by a network programming technique. The proposed algorithm has been tested on a system of up to 61 units to be scheduled over 24 hours. Experimental results show that this algorithm can obtain a satisfactory solution in 46.51 seconds on a VAX 111750 computer.
95103679 Optimal step-by-step restoration of distribution systems during excessive loads due to cold load pickup I_;;_kI,2i. and Pahwa, A.
Electric
Power Systems Res., Feb. 1995, 32, (2).
Restoration of a distribution system following extended outages may cause problems if the substation transformer capacity cannot supply the initial load. Excessive initial load is a result of loss of diversity in the distribution system. Dividing the system into sections and restoring these sections step by step is one of the solutions to overcome excessive load due to cold load pickup. In step-by-step restoration, the order of restoration of sections becomes an important factor in increasing the reliability and decreasing the average customer interruption duration. In this paper, step-by-step restoration of a distribution system to utilize transformer capacity to the maximum extent and to minimize the customer interruption duration is studied.
95103660 techniques
Power
factor
measurement
and
correction
Prasanna Kumar, C. S. er al., Elecrric Power Systems Res., Feb. 1995, 32, (2), 141-143. The prevailing method of power factor measurement is debatable. Certain methods are suggested in this paper with hints IO improve power factor measurement and correction.
95103681 systems Zhou, E. Z.
Power
oscillation
Elect. Power
& Energy
flow
study
of electric
power
Systems, 1995, 17, (2), 143-150.
An algorithm to compute power oscillation flow of electric power systems has been developed and presented. For a mode(s) of concern in a power svstem. the relative maenitudes and ohase aneles of Dower oscillation flow o> transmission lines in’the oscillatibn roce& can Le calculated. Also the contribution of each machine and each Poad in the system to the oscillation flow can be determined. In large scale interconnected power systems and for interarea oscillation modes, where hundreds of machines may participate in the oscillation, power oscillation flow analysis of tie-lines may provide more clear pictures of the oscillation than those obtained by other available methods.
95103662 A predictive power system stabilizer Saidy, M. and Hughes, F. M. (2), 101-111.
Integrated
/
Elecr. Power
voltage & Energy
regulator
and
Sysrems, 1995, 17,
An integrated voltage regulator and power system stabilizer based on one step ahead prediction is presented. The fixed parameter predictive control scheme is shown capable of providing consistently good voltage response and contribution to system damping over a wide range of operating conditions and system configuration. This is in contrast to the case with conventional automatic voltage regulator and power system stabilizer where performance varies widely with the operating situation and can even cause system instability.
Real-time assessment of a symmetrical 95103663 and microcontroller bas?d distance relay Waikar, D. L. 107-112.
ef al.,
Elecrric
Power
component
Sysrems Res., Feb. 1995, 32, (2),
The paper presents the design, implementations and real-time assessment of a nucrocontroller based digital distance relay that can be used for the protection of power transmission lines. The proposed design is implemented using a general-purpose Intel 8097 microcontroller and custommade filters, operational amplifiers, sample-and-hold amplifiers, multiplexers, and analog-to-digital converters. The relay software is based on a computationally efficient symmetrical component based fault distance estimation algorithm. Results of the performance assessment studies on this algorithm have shown promising fault distance estimates for first-zone faults on the protected transmission line.