The Experts below are selected from a list of 3762 Experts worldwide ranked by ideXlab platform
Wang Jian-feng - One of the best experts on this subject based on the ideXlab platform.
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Impact of Wind Power Generator on Stability of Offshore Oil Platform Power Systems
Power system technology, 2009Co-Authors: Wang Jian-fengAbstract:The interconnection of wind power generator with isolated power system can conserve fuel and reduce operation cost. Impacted by the features of wind power generation, the wind power penetration greatly influences the stability of isolated power system while the fuel is conserved. In this paper, a model of multi-pole permanent synchronous wind turbine generator as well as a model of isolated power system involving gas turbine generation units are built and the stability of this isolated power system, to which the wind power generators are connected, for Offshore Oil Platform supplied by gas turbine generators is evaluated. By means of simulation by PSCAD/EMTDC, the maximum wind power penetration of isolated power system supplies to Offshore Oil Platform supplied by three gas turbine generators is researched while the wind power generators are connected. Simulation results and the successful interconnection of Offshore wind power plant constructed by China National Offshore Oil Corporation show that the researched Offshore Oil Platform supplied by isolated power system with wind power generators connected can keep the system frequency and voltage stability in desired range and the impacts of the switching of/off of the wind power generators on system voltage and frequency are acceptable.
Lina Zhang - One of the best experts on this subject based on the ideXlab platform.
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A temperature-based fault pre-warning method for the dry-type transformer in the Offshore Oil Platform
International Journal of Electrical Power & Energy Systems, 2020Co-Authors: Yuanyuan Sun, Yue Hua, Erdong Wang, Lina ZhangAbstract:Abstract In the Offshore Oil Platform power system, the replacement of electric equipment is very inconvenient due to the far distance between the Platform and the land. Transformer is one of the most important electric equipment in the Oil power system, whose reliable operation is of essential importance to the normal Oil exploitation. Therefore, the condition of the transformer should be monitored continuously to find out the possible operating abnormality as soon as possible. The transformer temperature is a good indicator to reflect the transformer operating condition. Moreover, there is a large amount of historical operating data provided by the monitoring system in the Oil Platform power system, which can be used as the basis to distinguish the normal and abnormal operating condition of the transformer. In this paper, an abnormal temperature pre-warning method is proposed for the dry-type transformer in the Oil Platform power system. Based on the historical operating data, the dry-type transformer temperature model is established by the Sparse Bayesian Learning. The proposed model provides a temperature warning range. By entering the current transformer operating parameters into the model, the temperature range for a normal operating state can be obtained. If the temperature measured by the transformer sensors exceed the expected ranges, an abnormality may occur. The residual statistical analysis is adopted to distinguish the measurement errors and actual transformer abnormal operations. The effectiveness and validity of the proposed method are verified based on the real field data of an Oil Platform transformer.
Mei Ning - One of the best experts on this subject based on the ideXlab platform.
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Vibration Control of Multi-Tuned Mass Dampers for An Offshore Oil Platform
2002Co-Authors: Mei NingAbstract:The purpose of this study is to investigate the effectiveness of multi-tuned mass dampers (MTMD) on mitigating vi-bration of an Offshore Oil Platform subjected to ocean wave loading. An optimal design method is used to determine the optimal damper parameters under ocean wave loading. The force on the structure is determined by use of the linearized Morison equation. Investigation on the deck motion with and vvithout MTMD on the structure is made under design condi-tions. The results show that MTMD with the optimized parameters suppress the response of each structural mode. The sensitivity of optimum values of MTMD to characteristic wave parameters is also analyzed. it is indicated that a single TMD on the deck of a Platform can have the best performance, and the small the damping value of TMD, the betler the vibration control.
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STUDY ON VIBRATION CONTROL FOR A DISCRETE MODEL OF AN Offshore Oil Platform
Mechanics in Engineering, 2001Co-Authors: Mei NingAbstract:This study investigates a discrete model of an Offshore Oil Platform with tuned mass dampers (TMD) by using time-history analysis. The performance of a signal TMD and TMDs for different modes is studied. In design conditions (with mass ratio of 2%, significant wave frequency of 12, significant wave height of 10 m), the optimized TMD parameters to minimize the response to displacement of deck motion were obtained. The results show that the optimized TMD parameters results in reductions in response to all modal displacements. Of all methods to set TMDs, the effect of a signal TMD on the first modal mass is the best, and the less damping of TMD, the better effects of vibration control.
Henry M Page - One of the best experts on this subject based on the ideXlab platform.
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trophic links and condition of a temperate reef fish comparisons among Offshore Oil Platform and natural reef habitats
Marine Ecology Progress Series, 2007Co-Authors: Henry M Page, Jenifer E Dugan, Donna M Schroeder, Mary M Nishimoto, Milton S Love, Justin C HoestereyAbstract:We explored habitat-related variability in the composition and density of small inverte- brate prey of microcarnivorous reef fishes among 2 artificial (Offshore Oil Platform) and 2 natural reef habitats in the Santa Barbara Channel, USA, and the consequences of this variability to the condition of a resident reef fish, the painted greenling Oxylebius pictus. Amphipod crustaceans comprised the highest proportion of potential prey at all sites, but the amphipod assemblage from the Platforms con- tained a high percentage (>50% by number) of 2 exotic species, Caprella mutica and Erichthonius brasiliensis, that were either absent or rare on the natural reefs. At the Platforms, 80 to 90% of the caprellid amphipods consisted of C. mutica. Densities of amphipods varied among sites and were 10 to 100 × higher at one of the Platforms compared with the other sites. Amphipods comprised 89 to 98% (by number) of painted greenling diet. Fish condition factor (K) was correlated with absolute and per capita amphipod prey biomass. Our results fit a scenario described for some lotic systems where exotic amphipod species proliferate in the invaded habitat. Fish harvest the exotic species with positive effects on fish condition. The potential negative effects of the exotic species on the native amphipod assemblage thus contrast with a positive effect on the condition of a higher level consumer. Our findings suggest that trophic pathways on other types of artificial structures colonized by exotic species may also differ from those of the natural reef habitat.
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Spatial and temporal variability in early successional patterns of an invertebrate assemblage at an Offshore Oil Platform
Journal of Experimental Marine Biology and Ecology, 2005Co-Authors: Jason B. Bram, Henry M Page, Jenifer E DuganAbstract:Abstract The effects of selected physical and biological factors on the early development of a subtidal invertebrate assemblage were examined at an Offshore Oil Platform in the Santa Barbara Channel (California, USA). The effects of date, year, length, and depth of submersion were investigated by replacing sets of ceramic tiles with new tiles at frequencies of 2, 4, 6, 12, and 24 months at three depths (6, 12, and 18 m) over a period of 24 months. The effects of existing colonists and depth were explored in a second experiment by removing selected early colonists from ceramic tiles deployed at the same three depths over a period of 12 months. More than 40 invertebrate taxa from seven phyla colonized the tiles. Colonial tunicates and encrusting bryozoans appeared early in the successional sequence (∼2 months), in cover ranging from
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effects of an Offshore Oil Platform on the distribution and abundance of commercially important crab species
Marine Ecology Progress Series, 1999Co-Authors: Henry M Page, Jenifer E Dugan, Daniel S. Dugan, John B. Richards, David M. HubbardAbstract:The distribution, abundance, and population characteristics of large, highly mobile crab species (Cancer antennarius, C. anthonyi, C. productus, Loxorhynchus grandis) differed in relation to an Offshore Oil Platform in the Santa Barbara Channel, California, USA. Only C. antennarius individuals recruited onto the Platform, primarily into the attached community of Mytilus galloprovincialis and M. californianus at depths of <12 to 15 m. The higher CPUE (catch per unit effort) of C. antennarius beneath the Platform, compared with nearby soft bottom stations, suggested that this species remained primarily in the vicinity of the Platform. Although C. anthonyi did not recruit at the Platform, adult female C. anthonyi were attracted to the Platform from surrounding habitat. The higher CPUE of female C. anthonyi beneath the Platform, compared with soft bottom stations, suggested that habitat selection is related to reproduction in this species. C. productus and Loxorhynchus grandis were present in low numbers at all benthic stations. The distribution and abundance of these crab species fit into 3 of 4 hypothesized scenarios that described different combinations of recruitment, distribution and abundance of mobile species around Oil Platforms: (1) 'recruitment/emigration', a Platform provides recruitment habitat and individuals that recruit to the Platform emigrate at some point to the surrounding environment, (2) 'recruitment/resident', a Platform provides recruitment habitat, but individuals remain in the vicinity of the structure (C. antennarius), (3) 'attraction', individuals that recruited elsewhere are attracted to and aggregate at a Platform (C. anthonyi), and (4) 'visitor', individuals that recruited elsewhere occur temporarily at the Platform without aggregation (C. productus, L. grandis). Our results, in the context of these scenarios, illustrate the need to consider the responses of individual species to artificial structures.
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Effects of an Offshore Oil Platform on the distribution and abundance of commercially important crab species
Marine Ecology Progress Series, 1999Co-Authors: Henry M Page, Jenifer E Dugan, Daniel S. Dugan, John B. Richards, David M. HubbardAbstract:The distribution, abundance, and population characteristics of large, highly mobile crab species (Cancer antennarius, C. anthonyi, C. productus, Loxorhynchus grandis) differed in relation to an Offshore Oil Platform in the Santa Barbara Channel, California, USA. Only C. antennarius individuals recruited onto the Platform, primarily into the attached community of Mytilus galloprovincialis and M. californianus at depths of
Toyonobu Fujii - One of the best experts on this subject based on the ideXlab platform.
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temporal variation in environmental conditions and the structure of fish assemblages around an Offshore Oil Platform in the north sea
Marine Environmental Research, 2015Co-Authors: Toyonobu FujiiAbstract:Abstract This study reports temporal variations in the environmental conditions and the structure of fish assemblages observed in the vicinity of an Offshore Oil Platform and the surrounding seafloor in the North Sea. Multi-seasonal sampling was conducted at a typical large steel jacketed facility, using mid-water fish traps at three different depths (i.e., 10, 50 & 100 m). Commercially important gadoids such as saithe Pollachius virens , haddock Melanogrammus aeglefinus and cod Gadus morhua were the most abundant species, however, the species composition and the relative abundances of the species varied with depth, season and between years. Comparisons with a large-scale bottom trawl survey data suggested highly dynamic and species-specific interactions between fish movements, changing environmental conditions and the physical presence of an Offshore Platform. Given the number of Platforms currently installed across the North Sea, there is a need to identify biological mechanisms behind such dynamic interactions.
