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Strategy of constructing virtual peaking unit by public buildings’central air conditioning loads for day-ahead power dispatching

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Journal of Modern Power Systems and Clean Energy 2017年第2期5卷 187-201页

作者： Chenxing YANG Qingshan XU Xufang WANG School of Electrical Engineering Southeast UniversityNanjing 210096China

With the gradually widely usage of the air conditioning(AC) loads in developing countries, the urban power grid load has swiftly increased over the past *** in China, the AC load has accounted for over30% of the maximum load in many cities during *** paper proposes a scheme of constructing a virtual peaking unit(VPU) by public buildings’ cool storage central AC(CSCAC) systems and non-CSCAC(NCSCAC)systems for the day-ahead power network dispatching(DAPND). Considering the accumulation effect of different meteorological parameters, a short term load forecasting method of public building’s central AC(CAC) baseline load is firstly discussed. Then, a second-order equivalent thermal parameters model is established for the public building’s CAC load. Moreover, the novel load reduction control strategies for the public building’s CSCAC system and the public building’s NCSCAC system are respectively presented. Furthermore, based on the multiple-rank control strategy, the model of the DAPND with the participation of a VPU is set up. The VPU is composed of large-scale regulated public building’s CAC loads. To demonstrate the effectiveness of the proposed strategy, results of a sample study on a region in Nanjing which involves 22 public buildings’ CAC loads are described in this paper. Simulated results show that, by adopting the proposed DAPND scheme, the power network peak load in the region obviously decreases with a small enough deviation between the regulated load value and the dispatching instruction of the VPU. The total electricity-saving amount accounts for7.78% of total electricity consumption of the VPU before regulation.

关键词： central air conditioning Peak load shedding Day-ahead power network dispatching Virtual peaking unit Schedulable capacity

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Prevalence and risk factors of dry eye disease in young and middle-aged office employee:a Xi’an Study

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International Journal of Ophthalmology(English edition) 2021年第4期14卷 567-573页

作者： Jing-Wen Hu Xiu-Ping Zhu Shi-Yin Pan Hua Yang Xiang-Hua Xiao Department of Cardiology the First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710061Shaanxi ProvinceChina Shaanxi Institute of Ophthalmology Xi’an City First HospitalXi’an 710002Shaanxi ProvinceChina Shaanxi Key Lab of Ophthalmology Xi’an 710002Shaanxi ProvinceChina Clinical Center for Ophthalmology of Shaanxi Province Xi’an 710002Shaanxi ProvinceChina

AIM:To estimate the prevalence of and risk factors for dry eye disease(DED)in young and middle-aged office employee in Xi’***:This cross-sectional study of the prevalence of and risk factors for DED investigated 486 young and middle-aged Chinese office employee in Xi’*** symptoms and potential risk factors were assessed using the ocular surface disease index combined with a risk factors questionnaire,and tear function was evaluated using the tear film break-up time and Schirmer’s *** risk factors for DED were estimated by binary Logistic regression ***:DED was diagnosed in 100 females and 96 males,giving a prevalence of 40.3%[95%confidence interval(CI)=36.0%-44.7%].The multivariate binary Logistic regression model indicated that the possible risk factors for DED were being female(OR=1.592,95%CI=1.034-2.451,P=0.035),being aged≥40 y(OR=1.593,95%CI=1.034-2.454,P=0.035),using a VDT daily for>6 h(OR=1.990,95%CI=1.334-2.971,P=0.001),the presence of central air conditioning(OR=1.548,95%CI=1.053-2.276,P=0.026),and self-reported dryness of the mouth and nose(OR=1.589,95%CI=1.071-2.357,P=0.021).CONCLUSION:There is a high prevalence of clinically diagnosed DED in young and middle-aged video displayterminal(VDT)*** against the modifiable risk factors should be taken to prevent the occurrence and development of DED in this population.

关键词： dry eye disease prevalence office employee video display terminal central air conditioning age female

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