00/01358 A novel approach to conventional power system stabilizer design using tabu search

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The xenon transient in a CANDU-6 reactor loaded with DUPIC fuel has been studied. This study utilized WIMS-AECL to generate xenon proper- ties for the RFSP code to calculate the xenon load. The xenon property generation method by WIMS-AECL was validated for a natural uranium CANDU-6 core. The validation calculation has shown that the xenon load predicted by WIMS-AECL and RFSP is within 2% of the reference value obtained by the design codes POWDERPUFS-V and RFSP. The xenon load of the DUPIC fuel core was calculated for various reactor conditions such as shutdown, start-up and power level change; and the results were compared with those of a natural uranium core. This study has shown that the xenon load of CANDU-6 reactor loaded with DUPIC fuel is much lower than that of the natural uranium core: however, the xenon transients are stabilized in both cores. Economics, policy, supply, forecasts 00101355 Heat removal characteristics of vault storage system with cross flow for spent fuel Sakamoto, K. Nrrcl. Eag. and Design, 2000. 195, (I), 57-68. Since the amount of spent fuel to be stored is expected to steadily increase in Japan, a use of large-scale dry storage facilities is considered to be a promising method in practice at reasonable economic cost. The present study is concerned with the heat removal experiment of vault storage system adopting cross flow with passive cooling, using a l/5 scale model. The results show that the flow pattern of air in the storage module strongly depends on the ratio of the buoyancy to the inertia force. A simple method to estimate air-flow patterns in the storage module was proposed, where the Ri(Richardson) number was considered as the most representative parameter. Then the heat transfer rate from a storage tube to cooling air was estimated, which could apply to the design of a full-scale vault storage system with cross flow, in which dozens of storage tubes were placed. The acquired information was also used to optimize heat removal design of the vault storage system in the present study. 06 ELECTRICAL POWER r AND GENERATIO& UTILIZATION Scientific, technical 00101356 A global dynamic error driven control scheme for static VAR compensators Sharaf, A. M. Elccrric Poner S~~srems R~~crrch. 1999. 51, (2). 131-93. The paper presents a novel static VAR compensator SVC control scheme. The new SVC control strategy is validated on a single machine infinite bus power system with a dynamic non-linear load. 00/01357 A hybrid neural network model for fast voltage contingency screening and ranking Srivastava, L. PI al. Electrical Power & Energy Sysietns, 2000, 22, (I), 35-42. In this paper, a hybrid neural network based approach is proposed for fast voltage contingency screening and ranking. The developed hybrid neural network is a combination of a filter module and ranking modular neural network. All the selected contingency cases are applied to the filter module, which is trained to classify them either in critical contingency class or in non-critical contingency class using a modified BP algorithm. The screened critical contingencies are passed to the ranking modular neural network for their further ranking. The ranking modular neural network reduces a K- class problem to a set of K two-class problems with a separately trained network for each of the simpler problems. Total load demand, real and reactive pre-contingency line-flows and terminal voltages in the contingent element, along with a topology number corresponding to the contingent element, are selected as input features for the neural networks. The continuous values of voltage performance index are classified into four classes (levels) according to their severity, and the modular neural network is trained for this multi-class classification problem. The effectiveness of the proposed method is demonstrated by applying it for contingency screening and ranking at different loading conditions for IEEE 30-bus system and a practical 75bus Indian system. Once trained, the hybrid neural network gives fast and accurate screening and ranking for unknown patterns and is found to be suitable for on-line applications at Energy Management Systems. 06 Electrical power generation and utilization (scientific, technical) 00/01358 A novel approach to conventional power system stabilizer design using tabu search Abido, M. A. Electricd Power & Emv,g SI.,~ICI~T. 1999. 2 I. (6). Mm4S4. A tabu search (TS) based power system stabilizer (PSS) is presented in this article. The proposed approach uses the TS algorithm to search for the optimal settings of conventional lead-lag power system stabilizer (CPSS) parameters. Incorporation of the TS algorithm in the PSS design significantly reduces the time consumed in the design process. One of the main advantages of the proposed approach is the fact that the TS algorithm leads to the optimal solution regardless of the initial guess. The performance of the proposed PSS under different disturbances and loading conditions is investigated for single machine infinite bus and multi-machine power systems. The eigenvalue analysis and simulation results show the effectiveness of the proposed PSSs to damp out the local and the inter-area modes of oscillations and work effectively over a wide range of loading conditions and system parameter variations, 00101359 A study of the effects of compression on the performance of the positive active mass in lead-acid cells using absorptive glass mat separators CalAbek, M. er al. J. Power Sources, 1999, 78, (I-2). 94-98. A new electrochemical cell was designed and constructed to enable in situ measurements of the performance and internal resistances of lead-acid test electrodes in a vertical position during cycling at well-defined degrees of compression. The AGM separators used were combined with microporous paper separators to prevent short-circuiting by conducting bridges of lead dioxide. The test cells were subjected to pressures in the range O-g N/cm; the compression decreased the positive active mass resistance and increased its cycle life. 00/01360 An experimental investigation of self-excitation in capacitor excited induction generators Levi, E. and Liao, Y. W. Ekwfric, Powr SI..TICI~ Rc.wcrrc~h, 2000. 53. (I), 59- 65. Self-excitation process in induction generators is a complex physical phenomenon that has been studied extensively in the past. In-depth coverage of methods of steady-state analysis and models for simulation of transients is provided in the existing literature. Reports regarding experimental investigation of dynamics are however much less detailed. Usually, their only purpose is to prove the theoretical concepts. This paper attempts to fill in this gap by providing a purely experimental treatment of the self-excitation process in induction generators. The emphasis is placed on situations that lead to voltage collapse and total demagnetization of the machine, and on variable speed operation of the induction generator with a fixed capacitor bank. Operation with capacitors connected in star and delta under no-load conditions, connection of the purely resistive load, and connection of the resistive load with short-shunt compensation is elaborated. It is shown that some of the commonly quoted features of a self-excited generator operation do not necessarily hold true, while others are confirmed. 00101361 Analysis of overvoltages in overhead ground wires of extra high volta 8 e (EHV) power transmission line under single- phase-to-groun faults Dudurych, I. and Rosolowski, E. Ekectric Powr S~~srctns Rcseurch, 2000. 53. (2), 105-I 1 I. Overhead ground wires (GW) of extra high voltage (EHV) power transmission lines, apart from lightning-induced overvoltage protection are frequently used for carrier-current communication. In this case the ground wires are suspended on insulators. the dielectric strength of which should be sufficient for the line operational conditions. The insulation level is defined from the condition of the single-line-to-ground (SLG) fault, thus insulator protecting spark gaps should not be flashed-over during such conditions - in order to maintain continuity of the communication channel along the line. Overvoltages during such faults depend on many parameters such as fault place, fault angle, pre-fault load, etc. Therefore, designers should investigate the problem for determination of the worst-case scenario. In this paper, dependence of the overvoltages on 750 kV power transmission line ground wires upon the SLG fault place and pre-fault load of the line in transient and steady states is investigated. The analysis was performed by using dynamic arc model incorporated into the EMTP program. The provided simulations show that adequately introduced primary and secondary arc models are decisive factors for an accurate simulation of the electromagnetic phenomena in the EHV transmission lines during an arc crossing-over (here the primary arc plays an important role) and during so called dead-time, when the secondary arc takes place. This paper gives some recommendations for the insulator strings co- ordination in the 750 kV earth wires on the basis of computer simulation results. 00101362 Apparatus for testing of fuel ceils Dudnik, A. N. Ikotckhnol. Rcsrrr.soshcrr~het~~e, 1998, 3. 62-67. (In Russian) institut Gaza NAN Ukrainy. The main components and mechanisms of a fuel cell testing process are described. The main work parameters of the apparatus and the test results for obtaining synthesis gas are provided. The diagram of a start-up unit for testing molten carbonate fuel cells is also shown. Fuel and Energy Abstracts May 2000 153


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