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Intelligent Voltage Control Method in Active Distribution Networks Based on Averaged Weighted Double Deep Q-network Algorithm

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Journal of Modern Power Systems and Clean Energy 2023年第1期11卷 132-143页

作者： Yangyang Wang Meiqin Mao Liuchen Chang Nikos D.Hatziargyriou Research Center for Photovoltaic System Engineering Ministry of EducationSchool of Electrical Engineering and AutomationHefei University of TechnologyHefei 230009China University of New Brunswick FrederictonNB E3B 5A3Canada National Technical University of Athens Athens 15780Greece IEEE

High penetration of distributed renewable energy sources and electric vehicles(EVs)makes future active distribution network(ADN)highly variable.These characteristics put great challenges to traditional voltage control methods.Voltage control based on the deep Q-network(DQN)algorithm offers a potential solution to this problem because it possesses humanlevel control performance.However,the traditional DQN methods may produce overestimation of action reward values,resulting in degradation of obtained solutions.In this paper,an intelligent voltage control method based on averaged weighted double deep Q-network(AWDDQN)algorithm is proposed to overcome the shortcomings of overestimation of action reward values in DQN algorithm and underestimation of action reward values in double deep Q-network(DDQN)algorithm.Using the proposed method,the voltage control objective is incorporated into the designed action reward values and normalized to form a Markov decision process(MDP)model which is solved by the AWDDQN algorithm.The designed AWDDQN-based intelligent voltage control agent is trained offline and used as online intelligent dynamic voltage regulator for the ADN.The proposed voltage control method is validated using the IEEE 33-bus and 123-bus systems containing renewable energy sources and EVs,and compared with the DQN and DDQN algorithms based methods,and traditional mixed-integer nonlinear program based methods.The simulation results show that the proposed method has better convergence and less voltage volatility than the other ones.

关键词： Averaged weighted double deep Q-network(AWDDQN) deep Q learning active distribution network(ADN) voltage control electrical vehicle(EV)

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CPT及IRPT多场景电流分解对比及分析

电力自动化设备 2023年第1期43卷 166-173页

作者：丁勇茆美琴合肥工业大学光伏系统教育部工程研究中心安徽合肥230009

以新能源为主体的新型电力系统发展对系统计量装置、功率变换设备等提出了新要求,迫切需要革新的功率理论指导上述设备的设计与控制,以适应不同电气系统结构。通过构建多种含不同源荷类型的三相电气系统场景,针对守恒功率理论(CPT)及瞬... 详细信息

以新能源为主体的新型电力系统发展对系统计量装置、功率变换设备等提出了新要求,迫切需要革新的功率理论指导上述设备的设计与控制,以适应不同电气系统结构。通过构建多种含不同源荷类型的三相电气系统场景,针对守恒功率理论(CPT)及瞬时无功功率理论(IRPT),重点讨论二者在不同应用场景中电流分解的相似点及不同点。分析结果显示:IRPT仅在电压正弦条件下可以获得较好的电流分解结果,而基于CPT的电流分解,在正弦或非正弦等不同电压、负荷情况下均可较好地解释功率传输现象、分析负荷特性,其可作为有效的理论工具用于负荷特征识别、电费计量、滤波与补偿、功率变换器等领域中。

关键词：非正弦电压不平衡负荷瞬时无功功率理论守恒功率理论电流分解

Schedulable capacity forecasting for electric vehicles based on big data analysis

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Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1651-1662页

作者： Meiqin Mao Shengliang ZHANG Liuchen CHANG Nikos D.HATZIARGYRIOU Research Center for Photovoltaic System Engineering School of Electrical Engineering and AutomationHefei University of TechnologyHefei 230009China University of New Brunswick FrederictonNB E3B 5A3Canada National Technical University of Athens 15780 AthensGreece

Fast and accurate forecasting of schedulable capacity of electric vehicles(EVs)plays an important role in enabling the integration of EVs into future smart grids as distributed energy storage systems.Traditional methods are insufficient to deal with large-scale actual schedulable capacity data.This paper proposes forecasting models for schedulable capacity of EVs through the parallel gradient boosting decision tree algorithm and big data analysis for multi-time scales.The time scale of these data analysis comprises the real time of one minute,ultra-short-term of one hour and one-day-ahead scale of 24 hours.The predicted results for different time scales can be used for various ancillary services.The proposed algorithm is validated using operation data of 521 EVs in the field.The results show that compared with other machine learning methods such as the parallel random forest algorithm and parallel k-nearest neighbor algorithm,the proposed algorithm requires less training time with better forecasting accuracy and analytical processing ability in big data environment.

关键词： Electric vehicle(EV) Schedulable capacity Machine learning Big data Multi-time scale

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微网运行控制、建模与仿真专辑主编评述

电源学报 2020年第6期18卷 1-4页

作者：茆美琴合肥工业大学

微网技术自20世纪末期被提出,特别是近十年来经国内外广泛深入的研究、开发与技术示范,得到了快速的发展。微网特别是多能源微网,在未来能源互联网中将扮演着“有机细胞”作用,因而会受到学术及工业界的持续关注。基于自适应协调控制、... 详细信息

微网技术自20世纪末期被提出,特别是近十年来经国内外广泛深入的研究、开发与技术示范,得到了快速的发展。微网特别是多能源微网,在未来能源互联网中将扮演着“有机细胞”作用,因而会受到学术及工业界的持续关注。基于自适应协调控制、建模与稳定性分析、故障分析与保护等微网技术最新研究进展,《电源学报》特别推出《微网运行控制、建模与仿真》专辑,以探讨微网运行控制技术和建模与仿真技术难点和热点,推动微网技术的进一步深入研究。

关键词：微网运行控制微网保护微网建模主编述评

基于任务剖面的单相Boost型功率解耦光伏逆变器寿命预测

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太阳能学报 2022年第7期43卷 109-114页

作者：张榴晨张亚茆美琴合肥工业大学教育部光伏系统工程研究中心合肥230009

以单相Boost型功率解耦光伏并网逆变器为研究对象,提出一种基于任务剖面的光伏并网逆变器的寿命预测方法。首先将安装点1年的太阳辐照度和环境温度作为任务剖面,通过PLECS热模型仿真获得不同工况下IGBT的结温数据;然后利用插值查表法得... 详细信息

以单相Boost型功率解耦光伏并网逆变器为研究对象,提出一种基于任务剖面的光伏并网逆变器的寿命预测方法。首先将安装点1年的太阳辐照度和环境温度作为任务剖面,通过PLECS热模型仿真获得不同工况下IGBT的结温数据;然后利用插值查表法得到安装点年任务剖面下对应的IGBT结温剖面,并根据结温循环寿命模型预测单个IGBT的寿命;最后通过蒙特卡罗法计算IGBT的寿命分布函数,并利用串联系统可靠性评估框图得到逆变器系统的寿命分布。计算结果表明逆变器的寿命分布在5年以上,满足ISO 9001质量管理体系认证。

关键词：寿命预测可靠性评估蒙特卡罗法光伏逆变器任务剖面功率解耦

一种可提高单相光伏并网逆变器功率密度的新型功率解耦拓扑

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太阳能学报 2022年第6期43卷 33-41页

作者：茆美琴宋振宇张榴晨合肥工业大学教育部光伏系统工程研究中心合肥230009

滤波电感、电解电容和散热器是逆变器中体积占比最大的元件,为了提高具备功率解耦功能的单相光伏并网逆变器的功率密度,该文从滤波电感的功率处理的数学函数出发,推导可以减小电感体积、解耦电容体积、减小开关器件损耗的控制原理,演绎... 详细信息

滤波电感、电解电容和散热器是逆变器中体积占比最大的元件,为了提高具备功率解耦功能的单相光伏并网逆变器的功率密度,该文从滤波电感的功率处理的数学函数出发,推导可以减小电感体积、解耦电容体积、减小开关器件损耗的控制原理,演绎出一种提高了单相光伏逆变器功率密度的Boost型功率解耦单相逆变器拓扑。搭建额定功率为750 W的Matlab仿真模型和RT-LAB硬件在环仿真实验模型进行验证,与传统逆变器拓扑相比,该拓扑在实现功率解耦功能的基础上,减小了滤波电感的电感量和开关器件的开关损耗,提高了逆变器的功率密度和运行效率。

关键词：光伏逆变器拓扑功率解耦功率密度开关损耗

Light Intensity Affects the Coloration and Structure of Chimeric Leaves of Ananas comosus var.bracteatus

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Phyton-International Journal of Experimental Botany 2022年第2期91卷 333-348页

作者： Wei Yang Yuke Lin Yanbin Xue Meiqin Mao Xuzixing Zhou Hao Hu Jiawen Liu Lijun Feng Huiling Zhang Jiaheng Luo Jun Ma College of Landscape Architecture Sichuan Agricultural UniversityChengdu611130China

Ananas comosus var.bracteatus is an important ornamental plant because of its green/white chimeric leaves.The accumulation of anthocyanin makes the leaf turn to red especially in the marginal part.However,the red fades away in summer and winter.Light intensity is one of the most important factors affecting leaf color along the seasons.In order to understand the effects of light intensity on the growth and coloration of the chimeric leaves,Ananas comosus var.bracteatus was grown under full sunlight,50%shade and 75%shade for 75 days to evaluate the concentration of pigments,the color parameters(values L^(*),a^(*),b^(*))and the morpho-anatomical variations of chimeric leaves.The results showed that a high irradiance was beneficial to keep the chimeric leaves red.However,prolonged exposure to high irradiance caused a damage,some of the leaves wrinkled and even burned.Shading instead decreased the concentration of anthocyanin and increased the concentration of chlorophyll,especially in the white marginal part of the leaves.Numerous chloroplasts were observed in the mesophyll cells of the white marginal part of the chimeric leaves under shading for 75 days.The increase in chlorophyll concentration resulted in a better growth of plants.In order to balance the growth and coloration of the leaves,approximately 50%shade is suggested to be the optimum light irradiance condition for Ananas comosus var.bracteatus in summer.

关键词： Ananas comosus var.bracteatus light intensity leaf color anatomy

Clinical Analysis of 240 Patients with HLA-B27 Associated Acute Anterior Uveitis

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Eye Science 2012年第4期27卷 169-172页

作者： Yuqin Wang Xiaoya Lu Yulin Wang Liping mao Yunfeng Gu Pengfei Chen meiqin Zheng Zhejiang Ophthalmologic Hospital Eye Hospital of Wenzhou Medical College Department of Ophthalmology First Affiliated Hospital of Nanchang University

Purpose: To analyze the prevalence of HLA-B27 associated acute anterior uveitis and to identify its clinical features. Methods: A total of 240 patients with HLA-B27 associated acute anterior uveitis,who were admitted to Zhejiang Ophthalmologic Hospital between December 2006 and October 2012, were retrospectively analyzed.The age of onset,sex,affected eyes,HLA-B27 antigen detection,recurrence,joint involvement, and surgical complications were investigated. Results:The average age of onset was 37.0 ±12.0 years and the ratio of male to female patients was 2.4:1. Most cases had alternate unilateral or bilateral involvement. Among all participants, 234 cases (97.5%) were HLA-B27 positive, and 124 cases (51.7%) had spondyloarthropathies (SpA), dominated by 108 cases with ankylosing spondylitis. (AS,45.0%),and mostly seen in male subjects(P0.05).A total of 193 cases (80.4%) presented with complications, mainly fibrinous exudation, posterior synechia, and vitreous opacity. Conclusion: HLA-B27 that is associated acute anterior uveitis with a relatively high incidence and recurrence presents with more severe clinical features than does idiopathic acute anterior uveitis,and it often accompanies systemic arthritic diseases. HLA-B27 antibody detection is associated with the diagnosis and treatment of acute anterior uveitis.

关键词：虹膜葡萄急性临床分析发病率临床特点抗原检测统计意义

Orem自护理论运用于缺血性脑卒中患者中的效果观察

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基层医学论坛 2019年第21期23卷 2978-2980页

作者：毛美芹南通市通州区第七人民医院

目的观察Orem自护理论运用于缺血性脑卒中患者中的效果。方法将我院缺血性脑卒中患者92例随机分为观察组(n=46)及对照组(n=46),对照组使用常规教育健康教育,观察组患者在此基础上应用Orem自护理论护理,观察2组NIHSS评分、缺血性脑卒中... 详细信息

目的观察Orem自护理论运用于缺血性脑卒中患者中的效果。方法将我院缺血性脑卒中患者92例随机分为观察组(n=46)及对照组(n=46),对照组使用常规教育健康教育,观察组患者在此基础上应用Orem自护理论护理,观察2组NIHSS评分、缺血性脑卒中认知度、康复遵医行为、自我护理技巧、护理满意度。结果观察组缺血性脑卒中认知度好91.30%,掌握自我护理技巧86.96%,遵医康复93.48%,护理满意97.83%,均高于对照组的71.74%,60.87%,76.08%,85.78%(P<0.05),观察组NIHSS评分(6.34±1.04)分,低于对照组的(7.56±1.16)分(P<0.05)。结论Orem自护模式应用于缺血性脑卒中患者中,可促进患者对自身健康的认识,加强自我护理及康复,改善神经功能缺陷,值得临床应用。

关键词：缺血性脑卒中 Orem自护理论神经功能遵医行为护理满意度