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01292 Global environmental problems and perspective of nuclear energy
06
Electrical power supply and utilization (scientific, technical)
(HPST) pump capacity on the behaviour of small break LOCA was investi ated by reducing its discharge flow rate of UCN 3&4 to 50% for the 0.05 ft9 pump discharge leg break. Finally, the spectrum analysis was performed using the acceptable results of these two studies. The results show that the peak cladding temperature (PCT) and qeak local $adding oxidation (PLO) for the limiting break size of 0.05 ft (46.5 cm ) pump discharge leg break were 793°C and 0.486% respectively, which are in compliance with the Emergency Core Cooling System (ECCS) acceptance criteria 1204°C and 17% specified in 10 CFR 50.46. The results of this sensitivity study can be adapted to the optimal design of SIS for the future 2815 MWt Korean Standard Nuclear Power Plant and be contributed to the increase of economical gain. 96lo1291
A study on the criticality search of transuranium recycling BWR core by adjustlng supplied fuel composition in equilibrlum state
Seino, T. and Sekimoto, H. Ann. Nucl. Energy, 1998, 25, (4-5), 223-236. Some difficulties have been experienced when carrying out an extensive evaluation of the equilibrium state of Light Water Reactor (LWR) recycling operations. It is hard to keep their fixed criticality condition using conventional design codes due to the complexity of their calculation model for practical fuel and core design and the large amount of calculation time. An efficient approach is presented for securing the criticality in an equilibrium cycle by adjusting a supplied fuel composition. The criticality search is performed by the use of fuel importance obtained from the equation adjoined to a continuously fuel supplied core burn-up equation. Some numerical analyses were carried out to evaluate the mixed oxide (MOX) fuel composition of equilibrium Boiling Water Reactor (BWR) cores satisfying the criticality requirement. The comprehensive and quantitative characteristics on the equilibrium cores were shown by the results confining transuraniums for different MOX fuel loading fractions and irradiating conditions.
Economics, Policy, Supplies, Forecasts
performance of the TCPS damping control is evaluated in terms of its damping torque contribution to the power system. The results of numerical calculations and simulations from sample power systems are presented.
99101295 An applicatian of the novel network diakoptics algorithm for economic dispatch analysis Chen, S.-D. and Chen, J.-F. Electric Power Systems Research, 1997,43, (2), 133-141. This study introduces a novel approach involving the network diakoptics technique to evaluate the penalty factor term in parallel. The transposed Jacobian matrix derived from the load flow equations can be separated into as many independent sub-networks, referred to as a bordered block diagonal (BBD) matrix, as the processors of a parallel computer. The cutset block of a BBD matrix in parallel, however, is not easy to solve effectively. To alleviate this limitation, the voltage controlled buses should be selected in any cluster, hence, the penalty factors associated with the cutset block are ones and the computation time is reduced. Simulation results of the IEEE test systems and the Taiwan Power System confirm the feasibility of the proposed approach and its capability for implementation parallel processing for the economic dispatch analysis. 96lO1296
Applying H, optimisation method to power system stabiliser design Part 1: single-machine infinite-bus systems
Yang, T. C. Electrical Power and Energy Systems, 1997, 19, (l), 29-35. The paper studies the application of the H, optimization method to power system stabilizer design. The weighting function selection and application to multi-machine power systems are investigated separately. The PSS design for single-machine infinite-bus systems can be formulated as an H, mixedsensitivity optimization problem. A new method of selecting weighting functions and an extended conventional PSS structure are presented in the paper. 96101297
Applying H, optimisation method to power system stabiliser design Part 2: multi-machine power systems
Yang, T. C.
Global environmental problems and perspective of 98/01292 nuclear energy Komiyama, H. JAERI-Conf., 1996, 96-010, 15-20. From the perspective of nuclear energy production, global environmental problems are discussed, particularly air pollution by CO2 emissions from fossil fuels combustion. Forest fixation of COz is possible, however, it is claimed that solar and nuclear energy production cause the least pollution.
06
ELECTRICAL POWER SUPPLY AND UTILIZATION
Electrical Power and Energy Systems, 1997, 19, (l), 37-43.
96lO1296
Applying structured singular value to multi-machine power system stabilizer design
Yang, T. C. Electric Power Systems Research, 43, (2), 113-123. A design method for a power system stabilizer for multi-machine power systems is proposed. The design problem is translated into an equivalent problem of decentralized controller design for Multi-Input Multi-Output (MIMO) control systems. Each stabilizer can be designed independently, subject to a condition based on the structured singular values. The robust stability condition for power systems with stabilizers can be easily stated to achieve a sufficient interaction margin and a sufficient gain and phase margin, defined in the classical feedback theory during each independent design. Based on the concept of synchronous and damping torques, the conventional stabilizer design methodology is used to decide the design details of each stabilizer. The suggested design method is applied to a model of a practical 10 machine power system.
Arcing faults detection on overhead lines from the voltage signals
96lo1299
Scientific, Technical Analysis of performance of molten carbonate fuel 99lo1293 cell. V. Formulation of anode reaction resistance Morita, H. et al. Denki Kagaku oyobi Kogvo Butsuri Kagaku, 1997,65, (9), 740-746. (In Japanese) The formulation for reaction overpotential has a significant effect on the accuracy of the estimated performance of molten carbonate fuel cell (MCFC) under various operating conditions. The behaviour of cathode overpotential is well estimated from the dependence of mixed diffusion of superoxide ion and CO2 in (Li + K)/CO3 molten carbonate on the assumed partial pressure. Anode overpotential would be usually small compared with cathode overpotential and independent of partial pressure. However, anode overpotential increases at low hydrogen partial pressure and this problem has been addressed by examining the anode performances of single cells operated under various anode gas conditions expected to be used in LNG or coal fuelled power pant. The behaviour of anode overpotential is well described with P(Hz)(Hz partial pressure to minus half power) dependence.
Analysis of thyristor-controlled phase shifter applied in damping power system oscillations
96lo1294
Wang, H. F. et al. Electrical Power and Energy Systems, 1997, 19, (l), l-9. One of the potential options of the recently proposed FACTS (Flexible AC Transmission Systems) devices is the thyristor-controlled phase shifter (TCPS). Its application for power system oscillations damping is investigated on the basis of a Philips-Heffron model established here. The
114
Fuel and Energy Abstracts
March 1999
Zoric, K. J. et al. Electrical Power & Energy Systems, 1997, 19, (5), 287-292. A simple algorithm for arcing faults detection on overhead lines is presented. Based on the harmonic analysis of the bus voltage signals, it uses only the sine components of the odd higher harmonics. Such an approach provides the algorithm with insensitivity to the cosine components of the bus voltage odd higher harmonics which can be generated by current odd cosine higher harmonics. The automatic reclosing of lines with permanent faults can be blocked with this algorithm. A very simple arc model has been adopted. Successful testing was carried with signals recorded on a real power system and those obtained through computer simulated and laboratory tests.
99/01300 Carbon dioxide capture in molten carbonate fuel cell power plants fueled with coal and natural gas Reimer,
P. et al.
Proc. Intersoc. Energy Comers.
Eng. Conf., 1997, 32, 805-
810.
An IEA sponsored study is presented whose objective was to assess fuel cell power generation configurations that could be adopted if climate change considerations lead to a need to reduce emissions of COz into the atmosphere. A performance comparison, comparisons of CO2 emission, capital cost, cost of electricity, and cost of CO2 emission avoidance among four atmospheric, or near atmospheric, molten carbonate fuel cell/COz capturing plants are included. Each fuel cell combined cycle plant with CO2 capture was compared with a similarly sized reference combined cycle plant without CO2 capture to develop comparison characteristics. Data for the reference plants were taken from previously completed IEA studies. The first reference plant was a coal-fuelled integrated gasification combined cycle (IGCC) and the second was a typical natural gas-fuelled gas turbine combined cycle.
Electrical power supply and utilization (scientific, technical)
(HPST) pump capacity on the behaviour of small break LOCA was investi ated by reducing its discharge flow rate of UCN 3&4 to 50% for the 0.05 ft9 pump discharge leg break. Finally, the spectrum analysis was performed using the acceptable results of these two studies. The results show that the peak cladding temperature (PCT) and qeak local $adding oxidation (PLO) for the limiting break size of 0.05 ft (46.5 cm ) pump discharge leg break were 793°C and 0.486% respectively, which are in compliance with the Emergency Core Cooling System (ECCS) acceptance criteria 1204°C and 17% specified in 10 CFR 50.46. The results of this sensitivity study can be adapted to the optimal design of SIS for the future 2815 MWt Korean Standard Nuclear Power Plant and be contributed to the increase of economical gain. 96lo1291
A study on the criticality search of transuranium recycling BWR core by adjustlng supplied fuel composition in equilibrlum state
Seino, T. and Sekimoto, H. Ann. Nucl. Energy, 1998, 25, (4-5), 223-236. Some difficulties have been experienced when carrying out an extensive evaluation of the equilibrium state of Light Water Reactor (LWR) recycling operations. It is hard to keep their fixed criticality condition using conventional design codes due to the complexity of their calculation model for practical fuel and core design and the large amount of calculation time. An efficient approach is presented for securing the criticality in an equilibrium cycle by adjusting a supplied fuel composition. The criticality search is performed by the use of fuel importance obtained from the equation adjoined to a continuously fuel supplied core burn-up equation. Some numerical analyses were carried out to evaluate the mixed oxide (MOX) fuel composition of equilibrium Boiling Water Reactor (BWR) cores satisfying the criticality requirement. The comprehensive and quantitative characteristics on the equilibrium cores were shown by the results confining transuraniums for different MOX fuel loading fractions and irradiating conditions.
Economics, Policy, Supplies, Forecasts
performance of the TCPS damping control is evaluated in terms of its damping torque contribution to the power system. The results of numerical calculations and simulations from sample power systems are presented.
99101295 An applicatian of the novel network diakoptics algorithm for economic dispatch analysis Chen, S.-D. and Chen, J.-F. Electric Power Systems Research, 1997,43, (2), 133-141. This study introduces a novel approach involving the network diakoptics technique to evaluate the penalty factor term in parallel. The transposed Jacobian matrix derived from the load flow equations can be separated into as many independent sub-networks, referred to as a bordered block diagonal (BBD) matrix, as the processors of a parallel computer. The cutset block of a BBD matrix in parallel, however, is not easy to solve effectively. To alleviate this limitation, the voltage controlled buses should be selected in any cluster, hence, the penalty factors associated with the cutset block are ones and the computation time is reduced. Simulation results of the IEEE test systems and the Taiwan Power System confirm the feasibility of the proposed approach and its capability for implementation parallel processing for the economic dispatch analysis. 96lO1296
Applying H, optimisation method to power system stabiliser design Part 1: single-machine infinite-bus systems
Yang, T. C. Electrical Power and Energy Systems, 1997, 19, (l), 29-35. The paper studies the application of the H, optimization method to power system stabilizer design. The weighting function selection and application to multi-machine power systems are investigated separately. The PSS design for single-machine infinite-bus systems can be formulated as an H, mixedsensitivity optimization problem. A new method of selecting weighting functions and an extended conventional PSS structure are presented in the paper. 96101297
Applying H, optimisation method to power system stabiliser design Part 2: multi-machine power systems
Yang, T. C.
Global environmental problems and perspective of 98/01292 nuclear energy Komiyama, H. JAERI-Conf., 1996, 96-010, 15-20. From the perspective of nuclear energy production, global environmental problems are discussed, particularly air pollution by CO2 emissions from fossil fuels combustion. Forest fixation of COz is possible, however, it is claimed that solar and nuclear energy production cause the least pollution.
06
ELECTRICAL POWER SUPPLY AND UTILIZATION
Electrical Power and Energy Systems, 1997, 19, (l), 37-43.
96lO1296
Applying structured singular value to multi-machine power system stabilizer design
Yang, T. C. Electric Power Systems Research, 43, (2), 113-123. A design method for a power system stabilizer for multi-machine power systems is proposed. The design problem is translated into an equivalent problem of decentralized controller design for Multi-Input Multi-Output (MIMO) control systems. Each stabilizer can be designed independently, subject to a condition based on the structured singular values. The robust stability condition for power systems with stabilizers can be easily stated to achieve a sufficient interaction margin and a sufficient gain and phase margin, defined in the classical feedback theory during each independent design. Based on the concept of synchronous and damping torques, the conventional stabilizer design methodology is used to decide the design details of each stabilizer. The suggested design method is applied to a model of a practical 10 machine power system.
Arcing faults detection on overhead lines from the voltage signals
96lo1299
Scientific, Technical Analysis of performance of molten carbonate fuel 99lo1293 cell. V. Formulation of anode reaction resistance Morita, H. et al. Denki Kagaku oyobi Kogvo Butsuri Kagaku, 1997,65, (9), 740-746. (In Japanese) The formulation for reaction overpotential has a significant effect on the accuracy of the estimated performance of molten carbonate fuel cell (MCFC) under various operating conditions. The behaviour of cathode overpotential is well estimated from the dependence of mixed diffusion of superoxide ion and CO2 in (Li + K)/CO3 molten carbonate on the assumed partial pressure. Anode overpotential would be usually small compared with cathode overpotential and independent of partial pressure. However, anode overpotential increases at low hydrogen partial pressure and this problem has been addressed by examining the anode performances of single cells operated under various anode gas conditions expected to be used in LNG or coal fuelled power pant. The behaviour of anode overpotential is well described with P(Hz)(Hz partial pressure to minus half power) dependence.
Analysis of thyristor-controlled phase shifter applied in damping power system oscillations
96lo1294
Wang, H. F. et al. Electrical Power and Energy Systems, 1997, 19, (l), l-9. One of the potential options of the recently proposed FACTS (Flexible AC Transmission Systems) devices is the thyristor-controlled phase shifter (TCPS). Its application for power system oscillations damping is investigated on the basis of a Philips-Heffron model established here. The
114
Fuel and Energy Abstracts
March 1999
Zoric, K. J. et al. Electrical Power & Energy Systems, 1997, 19, (5), 287-292. A simple algorithm for arcing faults detection on overhead lines is presented. Based on the harmonic analysis of the bus voltage signals, it uses only the sine components of the odd higher harmonics. Such an approach provides the algorithm with insensitivity to the cosine components of the bus voltage odd higher harmonics which can be generated by current odd cosine higher harmonics. The automatic reclosing of lines with permanent faults can be blocked with this algorithm. A very simple arc model has been adopted. Successful testing was carried with signals recorded on a real power system and those obtained through computer simulated and laboratory tests.
99/01300 Carbon dioxide capture in molten carbonate fuel cell power plants fueled with coal and natural gas Reimer,
P. et al.
Proc. Intersoc. Energy Comers.
Eng. Conf., 1997, 32, 805-
810.
An IEA sponsored study is presented whose objective was to assess fuel cell power generation configurations that could be adopted if climate change considerations lead to a need to reduce emissions of COz into the atmosphere. A performance comparison, comparisons of CO2 emission, capital cost, cost of electricity, and cost of CO2 emission avoidance among four atmospheric, or near atmospheric, molten carbonate fuel cell/COz capturing plants are included. Each fuel cell combined cycle plant with CO2 capture was compared with a similarly sized reference combined cycle plant without CO2 capture to develop comparison characteristics. Data for the reference plants were taken from previously completed IEA studies. The first reference plant was a coal-fuelled integrated gasification combined cycle (IGCC) and the second was a typical natural gas-fuelled gas turbine combined cycle.