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Adaptive Power Control Based on Double-layer Q-learning Algorithm for Multi-parallel Power Conversion Systems in Energy Storage Station

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Journal of Modern Power Systems and Clean Energy 2022年第6期10卷 1714-1724页

作者： Yile Wu Le Ge xiaodong yuan Xiangyun Fu Mingshen Wang School of Electric Power Engineering Nanjing Institute of TechnologyNanjingChina State Grid Jiangsu Electric Power Co. Ltd.NanjingChina

An energy storage station(ESS)usually includes multiple battery systems under parallel *** each battery system,a power conversion system(PCS)is used to connect the power system with the battery *** allocating the ESS power to multi-parallel PCSs in situations with fluctuating operation,the existing power control methods for parallel PCSs have difficulty in achieving the optimal efficiency during a long-term time *** addition,existing Q-learning algorithms for adaptive power allocation suffer from the curse of *** overcome these challenges,an adaptive power control method based on the double-layer Q-learning algorithm for n parallel PCSs of the ESS is proposed in this ***,a selection method for the power allocation coefficient is developed to avoid repeated ***,the outer action space is divided into n+1 power allocation modes according to the power allocation characteristics of the optimal operation *** inner layer uses an actor neural network to determine the optimal action strategy of power allocations in the non-steady *** with existing power control methods,the proposed method achieves better performance for both static and dynamic operation efficiency *** proposed method optimizes the overall operation efficiency of PCSs effectively under the fluctuating power outputs of the ESS.

关键词： Double-layer Q-learning adaptive power control energy storage station(ESS) operation efficiency power conversion system(PCS)

Fully distributed control to coordinate charging efficiencies for energy storage systems

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Journal of Modern Power Systems and Clean Energy 2018年第5期6卷 1015-1024页

作者： Wei LIU Wei GU xiaodong yuan Kaifeng ZHANG School of Automation Nanjing University of Science and Technology School of Electrical Engineering Southeast University Jiangsu Electric Power Research Institute

This study proposes a novel fully distributed coordination control(DCC) strategy to coordinate charging efficiencies of energy storage systems(ESSs). To realize this fully DCC strategy in an active distribution system(ADS) with high penetration of intermittent renewable generation, a two-layer consensus algorithm is proposed and applied. It collects global information in the first layer and achieves pinning-based DCC in the second layer. Basic objectives of the proposed DCC for ESSs are: à to coordinate the ESSs and improve efficiency using associated marginal charging costs(MCCs) in a fully distributed manner; ` to reduce local power mismatch and power transmission losses; ′ to adapt to unintentional communication topology changes. The effectiveness and adaptability of the proposed DCC approach are both validated by simulation results.

关键词： Energy storage systems(ESSs) Distributed coordination control(DCC) Two-layer consensus algorithm Marginal charging costs(MCCs)

Effect of electroacupuncture at different acupoints in treating rapid gastric emptying:Zusanli(ST36)plus Zhongwan(CV12)versus Zhongwan(CV12)alone

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Journal of Traditional Chinese Medicine 2021年第2期41卷 326-330页

作者： YUE Gonglei yuan xiaodong GE Xiaobin DU Guangzhong Department of Acupuncture-Moxibustion and Tuina Qilu Hospital of Shandong UniversityJinan 250012China Shandong University of Traditional Chinese Medicine Jinan 250355China

OBJECTIVE:To evaluate the effect of electroacupuncture on rapid gastric emptying by comparing the effectiveness of electroacupuncture at both Zusanli(ST36)and Zhongwan(CV12)(He-Mu acupoints)versus electroacupuncture at Zhongwan(CV12)***:Sixty-five patients were randomly divided into two groups;33 patients in the He-Mu acupoints group received electroacupuncture at both Zusanli(ST36)and Zhongwan(CV12),while 32 patients in the single acupoint group received electroacupuncture only at Zhongwan(CV12).Both groups were treated once daily for 30 min,five times per week for 3 *** and after the 3-week treatment course,patients underwent gastric emptying scintigraphy and were assessed using the Traditional Chinese Medicine(TCM)symptom scale of gastrointestinal *** two groups were compared regarding the percentages of gastric retention at 30 and 60 min and the TCM symptom ***:After the treatment course,the percentages of gastric retention at 30 and 60 min were significantly improved in both groups compared with the pre-treatment values(P<0.01).The improvement in the gastric retention was significantly better in the He-Mu acupoints group than the single acupoint group at 30 min(P<0.01)and 60 min(P<0.05).The TCM symptom score was significantly decreased after the treatment course in both groups(P<0.01).The improvement in the TCM symptom score was significantly better in the He-Mu acupoints group than the single acupoint group(P<0.01).The total effective rate was 93.55%(29/31)in the He-Mu acupoints group and 77.42%(24/31)in the single acupoint *** treatment effect was better in the He-Mu acupoints group than the single acupoint group(P<0.05).CONCLUSIONS:Electroacupuncture at both Zusanli(ST36)and Zhongwan(CV12)or at Zhongwan(CV12)alone is effective in treating rapid gastric ***,electroacupuncture at both Zusanli(ST36)and Zhongwan(CV12)is more effective than electroacupuncture at Zhongwan(CV12)alone.

关键词： gastric emptying electroacupuncture point ST 36(Zusanli) point CV 12(Zhongwan) Points He-Mu

Distribution Characteristics and Controlling Factors of Heavy Metals in Surface Sediments from the Bay-Island-Estuary System(BIES):A Case Study in Coastal Waters of Fujian Province,China

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Journal of Ocean University of China 2023年第5期22卷 1253-1268页

作者： LIU Bo HU Rijun WANG Yonghong LI Yi ZHU Longhai ZHANG xiaodong yuan xiaodong College of Marine Geosciences Ocean University of ChinaQingdao 266100China Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationOcean University of ChinaQingdao 26610China Huaneng Xiapu Nuclear Power Co.Ltd. Ningde 352000China

Based on the contents of six heavy metal elements in surface sediments from coastal areas of Fujian Province,the distribution characteristics and controlling factors of six heavy metals in a bay-island-estuary system(BIES)were *** paper focuses on the influence of the hydrodynamic environment,and systematically discusses how grain size compositions,chemical environment,tidal current,ocean circulation and human activities influence the distribution and transportation of the heavy *** results indicated that the distribution and migration of Cu,Pb,Zn and Cr elements were mainly controlled by natural factors such as regional geological background,grain size compositions,and tidal residual *** contrast,As and Hg was mainly affected by human factors such as agriculture and industrial *** the BIES,where the chemical environment exerted limited influence,the accumulation and migration of heavy metals are mainly influenced by human activities and enhanced by estuary processes as well as the complex sedimentary dynamic environment caused by many bays and islands.

关键词： heavy metals sediments source to sink controlling factors hydrodynamic environment

Study on the Sediment Transport Flux and Mechanism in the Bohai Strait at the Tidal and Monthly Scales in Summer

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Journal of Ocean University of China 2023年第1期22卷 75-87页

作者： yuan xiaodong FENG Xiuli HU Rijun JIANG Shenghui ZHONG Wei College of Marine Geoscience Ocean University of ChinaQingdao 266100China Key Laboratory of Submarine Geosciences and Prospecting Techniques MOEOcean University of ChinaQingdao 266100China

Based on the data of tidal currents and suspended sediment concentrations observed synchronously at 11 stations in the Bohai Strait lasting for 25 hours,the temporal and spatial variations of currents and suspended sediment concentrations in the Bohai Strait in summer were *** Study preliminarily discussed the transport mechanism,transport trend and transport flux of suspended sediments in summer,using flux-mechanism decomposition method and numerical *** suspended sediment transport was mainly controlled by advection and next influenced by vertical net circulation,while resuspension is relatively weak in Bohai *** single-width fluxes of investigation stations varied from 3.8 to 89.1 gm^(−1) s^(−1),with the maximum value in Miaodao *** suspended sediment transport trends in Laotieshan channel along the vertical section are obviously *** waters mainly flow out of the Bohai Sea in surface layer,while into the Bohai Sea in bottom ***,the transport trends of other channels in the centre and south are consistent *** sediments in the Bohai Strait follows the transport pattern of moving outward from the south and inward from the north in summer,i.e.,the sediments are carried out of the Bohai Sea through the Laotieshan channel,while into the Bohai Sea through other *** the outflow flux exceeds the inflow flux in August with the net water flux of 1.4×10^(10)m^(3),basically same as the deliveries of the rivers into the Bohai ***,the suspended sediment flux is 0.33 Mt under the action of tidal residual currents in the Yellow Sea in August.

关键词： Bohai Strait suspended sediment transport numerical simulation summer

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Effect of Hydrophobic Modification on the Durability and Environmental Properties of Porous MgF_2 Antireflective Films

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Acta Metallurgica Sinica(English Letters) 2014年第4期27卷 649-655页

作者： Lianghong Yan Nan Liu Songnan Zhao Hongwei Yan Haibing L xiaodong yuan Research Center of Laser Fusion China Academy of Engineering Physical

Conventional porous MgF2 antireflective films show poor environmental durability due to its hydrophilic *** improve the film environmental durability,hydrophobic porous MgF2 antireflective films are prepared by a methyl silicone-modified MgF2 *** of the methyl silicone proportions on the film properties are examined in order to control the wettability,peak transmittance,and environmental durability of the *** modification of methyl silicone can increase the film hydrophobicity,thus decreases the adsorption of water,and improves the environmental ***,large amounts of methyl silicone could increase the film refractive index,resulting in the decrease in peak transmittance for films on BK7 *** with 40% silicone show water contact angle of 110°,peak transmittance of 98.7%,and good environmental *** results of accelerated test show that the environmental durability of the porous MgF2 films modified with 40% methyl silicone is six times higher than that of the conventional films.

关键词： Porous MgF2 Antireflective film Environmental durability Hydrophobicity

急性后循环缺血性脑卒中患者睡眠状态变化与预后影响因素的研究

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中国全科医学 2025年第5期28卷 548-553页

作者：张萍淑薛晶邢爱君王连辉马倩符永山元小冬华北理工大学附属开滦总医院神经内科河北省唐山市063000 华北理工大学附属开滦总医院心内科河北省唐山市063000 河北省神经生物机能重点实验室河北省唐山市063000

背景脑卒中患者通常伴有睡眠状态紊乱失衡,这在临床治疗中极易被忽视,且目前针对睡眠状态是否对该类疾病预后产生影响的研究较少。目的探究急性后循环缺血性脑卒中患者睡眠状态变化与预后影响的因素。方法选取2019年12月—2023年12月在... 详细信息

背景脑卒中患者通常伴有睡眠状态紊乱失衡,这在临床治疗中极易被忽视,且目前针对睡眠状态是否对该类疾病预后产生影响的研究较少。目的探究急性后循环缺血性脑卒中患者睡眠状态变化与预后影响的因素。方法选取2019年12月—2023年12月在华北理工大学附属开滦总医院诊治的急性后循环缺血性脑卒中患者60例为病例组,根据患者出院时改良Rankin(mRS)评分,将病例组分为预后良好亚组45例,预后不良亚组15例。选取同时期无脑血管狭窄且无急性缺血性脑卒中患者52例作为对照组。收集患者一般及临床资料,比较病例组与对照组患者昼夜睡眠-觉醒节律、日间睡眠-觉醒节律、夜间睡眠-觉醒节律指标以及预后良好亚组与预后不良亚组梗死脑区分布的差异性。采用多因素Logistic回归分析探讨急性后循环缺血性脑卒中患者预后不良的影响因素。结果病例组睡眠呼吸暂停低通气指数(AHI)高于对照组(P<0.05)。病例组睡眠周期颠倒、日间睡眠增多、夜间入睡困难所占比例高于对照组(P<0.05)。病例组日间总睡眠时间、入睡后清醒时间、浅睡眠期、深睡眠期、非快速眼动(NREM)睡眠期、快速眼动(REM)睡眠期、REM睡眠期占比、深睡眠期占比高于对照组,NREM睡眠期占比、浅睡眠期占比低于对照组(P<0.05)。病例组夜间总睡眠时间、浅睡眠期、NREM睡眠期高于对照组(P<0.05)。预后不良亚组桥脑梗死占比高于预后良好亚组(P<0.05)。多因素Logistic回归分析结果显示,日间深睡眠期(OR=1.203,95%CI=1.032~1.401)、桥脑梗死(OR=16.497,95%CI=1.142~238.391)是急性后循环缺血性脑卒中预后不良的影响因素(P<0.05)。结论急性后循环缺血性脑卒中患者AHI增高,睡眠状态特征为睡眠周期颠倒、日间睡眠增多、夜间入睡困难,且日间深睡眠期、桥脑梗死是患者预后不良的影响因素。

关键词：卒中脑梗死,后循环睡眠状态预后病例对照研究影响因素分析

Optimal Dispatch for Flexible Uncertainty Sets in Multi-energy Systems: An IGDT Based Two-stage Decision Framework

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 2374-2385页

作者： Shuai Lu Guannan Lou Wei Gu Suhan Zhang xiaodong yuan Qiang Li Huachun Han the School of Electrical Engineering Southeast UniversityNanjing 210096China the State Grid Jiangsu Electric Power Company Research Institute Nanjing 210024China

The operational stability and economy of multi-energy systems(MES)are threatened by various uncertainties,such as variable renewable energy power,energy demands,and weather *** of the existing methods for the dispatch decisions of MES are based on the prescribed probability distribution or uncertainty sets of random variables,which have many disadvantages,such as potential infeasibility and *** this paper,we propose a novel dispatch model for MES that integrates dispatch decision making,uncertainty set selection,and operational cost control into a unified ***,the deterministic dispatch model of MES is introduced,in which the physical characteristics of district heating systems and buildings are fully ***,a novel decision framework that combines the two-stage dispatch strategy and info-gap decision theory(IGDT)is proposed for MES,where the uncertainty set is flexible and can be optimized based on the operational cost ***,a revised algorithm,based on the column-and-constraint generation method,is proposed for the *** studies are performed on MES that includes a 33-bus distribution system and a heating network modified from a real 51-node network located in Jinlin Province,*** results verify the effectiveness of the proposed method.

关键词： Dispatch decision flexible uncertainty set info-gap decision theory multi-energy systems operational cost budget two-stage dispatch strategy

Integrated approach for optimal island partition and power dispatch

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Journal of Modern Power Systems and Clean Energy 2018年第3期6卷 449-462页

作者： Junpeng ZHU Wei GU Ping JIANG Zhi WU xiaodong yuan Yinghui NIE School of Electrical Engineering Southeast University Jiangsu Electric Power Company Research Institute

Operating in island mode when failure occurs in sure to maintain an uninterrupted power supply to significant loads. A two-stage approach that integrates optimal island partition and power dispatch is proposed in this paper, considering photovoltaics(PVs), batteries(BEs) and electric vehicles(EVs) as the power sources. In the first stage, energy indices are defined to describe the energy demand and the maximum energy that these distributed energy resources(DERs) can provide, and islands are partitioned based on an energy constraint. Considering the variability the loads and PVs, the energy constraint is a necessary but not sufficient condition for island operation,so in the second stage, a power dispatch model is proposed the active distribution network(ADN) is an effective mea-as a test for the island partition result. Sequential power flow is also simulated to guarantee a feasible and optimized island status. The situations when the tests are not passed are analyzed and classified, and corresponding modifications for the first stage model are provided. Multiple levels of constraints based on the energy index are established for the island partition model. The proposed approach has been validated through simulation using a modified IEEE 69-bus system which is divided into three districts with different load variability characteristics.

关键词： Optimal island partition Distributed generation Island power dispatch Active distribution networks Photovoltaic Electric vehicles