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Influences of Lateral Double-Layered Deflectors on Cooling Performance of Air-Cooled Condenser 被引量:3
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作者 HUANG Wenhui HUANG Xianwei +1 位作者 YANG Lijun DU Xiaoze 《Journal of Thermal Science》 SCIE EI CAS CSCD 2021年第6期2164-2177,共14页
The cooling performance of air-cooled condenser(ACC)is susceptible to adverse impacts of ambient winds.In this work,three kinds of lateral double-layered deflectors installed under the ACC platform are proposed to wea... The cooling performance of air-cooled condenser(ACC)is susceptible to adverse impacts of ambient winds.In this work,three kinds of lateral double-layered deflectors installed under the ACC platform are proposed to weaken the unfavorable effects of cross winds.Through CFD simulation methods,the main parameters of thermo-flow performances of a 2×660 MW direct dry cooling system are obtained,by which it can be concluded that the deflectors can effectively reduce the inlet air temperatures while enhance the mass flow rates of upwind fans due to the guiding effect,especially at high wind speeds,while the improvement of cooling capacity of ACCs in the 0°wind direction is weak.The inclined-vertical deflectors are superior to others in performance improvement of ACCs for all cases,which can reduce the turbine back pressure by 12.15%when the wind speed is 12 m/s,so they can be applied to the performance enhancement of ACCs under windy conditions in practical engineering. 展开更多
关键词 air-cooled condenser lateral double-layered deflectors cooling capacity turbine back pressure wind speed and direction
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Mixed Aleatory-epistemic Uncertainty Modeling of Wind Power Forecast Errors in Operation Reliability Evaluation of Power Systems 被引量:4
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作者 Jinfeng Ding Kaigui Xie +4 位作者 Bo Hu Changzheng Shao Tao Niu Chunyan Li Congcong Pan 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2022年第5期1174-1183,共10页
As the share of wind power in power systems continues to increase, the limited predictability of wind power generation brings serious potential risks to power system reliability. Previous research works have generally... As the share of wind power in power systems continues to increase, the limited predictability of wind power generation brings serious potential risks to power system reliability. Previous research works have generally described the uncertainty of wind power forecast errors(WPFEs) based on normal distribution or other standard distribution models, which only characterize the aleatory uncertainty. In fact, epistemic uncertainty in WPFE modeling due to limited data and knowledge should also be addressed. This paper proposes a multi-source information fusion method(MSIFM) to quantify WPFEs when considering both aleatory and epistemic uncertainties. An extended focal element(EFE) selection method based on the adequacy of historical data is developed to consider the characteristics of WPFEs. Two supplementary expert information sources are modeled to improve the accuracy in the case of insufficient historical data. An operation reliability evaluation technique is also developed considering the proposed WPFE model. Finally,a double-layer Monte Carlo simulation method is introduced to generate a time-series output of the wind power. The effectiveness and accuracy of the proposed MSIFM are demonstrated through simulation results. 展开更多
关键词 wind power forecast error(WPFE) epistemic uncertainty multi-source information fusion method(MSIFM) operation reliability extended focal element(EFE) double-layer Monte Carlo simulation
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