检索结果-南通市图书馆

International Journal of Automation and computing 2020年第4期17卷 599-609页

作者： ali darvish falehi Department of Electrical Engineering Shahid Beheshti UniversityTehran ***Iran

Quickly getting back the synchronism of a disturbed interconnected multi-area power system due to variations in loading condition is recognized as prominent issue related to automatic generation control(AGC).In this regard,AGC system based on fuzzy logic,i.e.,so-called FLAGC can introduce an effectual performance to suppress the dynamic oscillations of tie-line power exchanges and frequency in multi-area interconnected power *** from that,simultaneous coordination scheme based on particle swarm optimization(PSO)along with real coded genetic algorithm(RCGA)is suggested to coordinate FLAGCs of the all *** clarify the high efficiency of aforementioned strategy,two different interconnected multi-area power systems,i.e.,three-area hydro-thermal power system and five-area thermal power system have been taken into account for relevant *** potency of this strategy has been thoroughly dealt with by considering the step load perturbation(SLP)in both the under study power *** sum up,the simulation results have plainly revealed dynamic performance of FLAGC as compared with conventional AGC(CAGC)in each power system in order to damp out the power system oscillations.

关键词： Power system dynamic stability fuzzy logic automatic generation control(FLAGC) particle swarm optimization(PSO) real coded genetic algorithm(RCGA) simultaneous coordination scheme

Dynamic stability enhancement of interconnected multi-source power systems using hierarchical ANFIS controller-TCSC based on multi-objective PSO

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2017年第3期18卷 394-409页

作者： ali darvish falehi ali MOSALLANEJAD Department of Electrical Engineering Shahid Beheshti UniversityTehran ***Iran

Suppression of the dynamic oscillations of tie-line power exchanges and frequency in the affected interconnected power systems due to loading-condition changes has been assigned as a prominent duty of automatic generation control(AGC). To alleviate the system oscillation resulting from such load changes, implementation of flexible AC transmission systems(FACTSs) can be considered as one of the practical and effective solutions. In this paper, a thyristor-controlled series compensator(TCSC), which is one series type of the FACTS family, is used to augment the overall dynamic performance of a multi-area multi-source interconnected power system. To this end, we have used a hierarchical adaptive neuro-fuzzy inference system controller-TCSC(HANFISC-TCSC) to abate the two important issues in multi-area interconnected power systems, i.e., low-frequency oscillations and tie-line power exchange deviations. For this purpose, a multi-objective optimization technique is inevitable. Multi-objective particle swarm optimization(MOPSO) has been chosen for this optimization problem, owing to its high performance in untangling non-linear objectives. The efficiency of the suggested HANFISC-TCSC has been precisely evaluated and compared with that of the conventional MOPSO-TCSC in two different multi-area interconnected power systems, i.e., two-area hydro-thermal-diesel and three-area hydro-thermal power systems. The simulation results obtained from both power systems have transparently certified the high performance of HANFISC-TCSC compared to the conventional MOPSO-TCSC.

关键词： Hierarchical adaptive neuro-fuzzy inference system controller(HANFISC) Thyristor-controlled series compensator(TCSC) Automatic generation control(AGC) Multi-objective particle swarm optimization(MOPSO) Power system dynamic stability Interconnected multi-source power systems

Integrated asset management:a case study of technical and economic optimization of surface and well facilities

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2019年第5期16卷 1221-1236页

作者： Arman darvish Sarvestani ali Moazami Goodarzi ali Hadipour Oil&Gas Reservoir Engineering Department Tarh-o-Palayesh Engineering CompanyTehranIran Process and Mechanical Group Tarh-o-Palayesh Engineering CompanyTehranIran

Oil production could be increased by using optimization techniques in each stage of oil production system from field to production ***,the maximum profit will be obtained once integrated optimization of surface and subsurface components of the oil production system is *** addition,when using high-tech equipment and facilities,an integrated study of well and surface facilities affects the economic benefits *** this work,one of the Iranian brown fields(mature or declining production fields)was studied to find the best renovation plan with maximum *** base scenario was designed with four stages of separation,and the high-pressure gases from the first and the second separator were planned to be sold,while the low-pressure gases from subsequent stages were supposed to be *** this paper,two additional scenarios,namely separator optimization and full optimization,were proposed and 12 cases were *** the full optimization scenario,low-pressure gases were prevented from being *** was observed that by stopping the flaring systems,gas production rate increases as high as 20%and 150 to 200 MW power will be generated in all cases during the next 20 ***,economic evaluation for all of the cases was done and different cases were compared in terms of incremental annual worth and payback period.

关键词： Separator Electricity Gas lift Flare NPV Optimization

Nematode community structure in relation to metals in the southern of Caspian Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2017年第10期36卷 79-86页

作者： Kazem darvish Bastami Mehrshad Taheri Maryam Yazdani Foshtomi Sarah Haghparast ali Hamzehpour Hossein Bagheri Marjan Esmaeilzadeh Neda Molamohyeddin Iranian National Institute for Oceanography and Atmospheric Science (INIOAS) Department of Fisheries Faculty of Animal Science and Fisheries Sari Agricultural Sciences and Natural Resources University Department of Environmental Science Faculty of Environment and Energy Science and Research Branch Islamic Azad University Department of Marine Science and Technology Tehran North Branch Islamic Azad University

Spatial distribution and structure of nematode assemblages in coastal sediments of the southern part of the Caspian Sea were studied in relation to environmental factors. By considering metals, organic matter, Shannon diversity index（H）, maturity index（MI） and trophic diversity（ITD）, ecological quality status of sediment was also determined. Fifteen nematode species belonging to eleven genera were identified at the sampling sites. Average density of nematode inhabiting in sediment of the studied area was 139.78±98.91（ind. per 15.20 cm^2）. According to redundancy analysis（RDA）, there was high correlation between metals and some species. Based on biological indicators, the studied area had different environmental quality. Generally, chemical and biological indices showed different results while biological indices displayed similar results in more sites.

关键词： free-living nematodes metal ecological quality status the Caspian Sea