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动态安全智能评估中故障位置特征表达的电气坐标距离保持

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中国电机工程学报 2024年第12期44卷 4615-4625,I0003页

作者：齐航任喆李常刚刘玉田电网智能化调度与控制教育部重点实验室(山东大学) 山东省济南市250061

电力系统动态安全性与故障位置密切相关,故障位置特征的准确表达是构建数据驱动动态安全评估模型的关键。该文基于电气坐标形式的故障位置特征表达方法,提出故障位置特征严格距离保持概念,构建计及故障位置特征距离保持的动态安全评估... 详细信息

电力系统动态安全性与故障位置密切相关,故障位置特征的准确表达是构建数据驱动动态安全评估模型的关键。该文基于电气坐标形式的故障位置特征表达方法,提出故障位置特征严格距离保持概念,构建计及故障位置特征距离保持的动态安全评估模型。首先,证明全维电气坐标在切比雪夫距离度量下满足严格距离保持要求。然后,分析切比雪夫距离度量下电气坐标的距离保持能力与电气坐标维数间的关系。最后,基于K近邻算法构建计及电气坐标距离保持能力的暂态稳定极限切除时间评估模型。以某省级电网为例,验证故障位置电气坐标距离保持能力对动态安全评估精度的贡献。

关键词：故障位置特征表达数据驱动的动态安全评估电气坐标距离保持切比雪夫距离

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新加坡初中生物学课程标准中的课程内容分析

生物学教学 2024年第8期49卷 22-23页

作者：刘雨田杨希哲刘佩南宁师范大学教育科学学院南宁530001

新加坡中小学科学教育在全球享有盛誉。本文分析了新加坡最新修订的《初中生物学课程标准(2023年版)》后发现,其课程内容共有4大模块和14个主题,现实生活应用全面渗透于各学习主题中,内容标准分为学习模块的总体阐述和学习主题的具体阐... 详细信息

新加坡中小学科学教育在全球享有盛誉。本文分析了新加坡最新修订的《初中生物学课程标准(2023年版)》后发现,其课程内容共有4大模块和14个主题,现实生活应用全面渗透于各学习主题中,内容标准分为学习模块的总体阐述和学习主题的具体阐述,阐述方法采取问题引导+陈述式表述。这些特点为我国生物学课程标准的修订与完善提供了借鉴。

关键词：新加坡课程标准学习主题

优质高等教育机会获得过程中家校优势如何累积——家长参与和教育累积优势的链式中介效应

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高教探索 2024年第4期 50-58页

作者：张学敏刘羽田唐彪西南大学西南民族教育与心理研究中心重庆400715 广西教育研究院西南大学研究生院综合科重庆400715 西南大学教育学部重庆400715

教育是一个连续性过程,优质高等教育机会获得是家庭资本优势和学校教育优势长效累积的结果。基于问卷调查数据建立的家庭资本影响高等教育机会获得的链式中介模型分析发现:优质高等教育机会获得的阶层差距显著,家庭资本可以通过获得差... 详细信息

教育是一个连续性过程,优质高等教育机会获得是家庭资本优势和学校教育优势长效累积的结果。基于问卷调查数据建立的家庭资本影响高等教育机会获得的链式中介模型分析发现:优质高等教育机会获得的阶层差距显著,家庭资本可以通过获得差异性的教育机会,帮助子女形成教育累积优势,从而影响子女优质高等教育机会获得。进一步分析还发现,家长参与和教育累积优势在家庭资本和优质高等教育机会获得之间起链式中介作用,家长参与的转化效应叠加教育优势的累积效应是导致优质高等教育机会获得阶层差距的重要原因。缩小优质高等教育机会获得阶层差距,助力共同富裕,需在教育质量、入学机会和家长参与效能方面对弱势家庭进行正义性补偿。

关键词：家庭资本家长参与教育累积优势高等教育机会获得教育公平

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公费定向师范教育在地化改革的价值与路径

大学教育 2024年第12期 113-116页

作者：刘雨田南宁师范大学教育科学学院广西南宁530299

推进公费定向师范教育在地化改革,有利于提高人才培养的适配性,强化地方高校服务当地发展的教育职能;有利于乡村教育获取高质量的在地资源,绘制中国式乡村教育现代化的地方画卷;有利于促进乡村学生健康成长,为乡村振兴积蓄人力资本。在... 详细信息

推进公费定向师范教育在地化改革,有利于提高人才培养的适配性,强化地方高校服务当地发展的教育职能;有利于乡村教育获取高质量的在地资源,绘制中国式乡村教育现代化的地方画卷;有利于促进乡村学生健康成长,为乡村振兴积蓄人力资本。在推进路径上,要确立教育目标,培养现代化乡村教师;要完善课程体系,师范性、乡土性、现代性融通并举;要转变“自我—乡村”关系认知,培养文化回应性教育能力;要构建“U-G-S”合作模式,全面引领在地化改革。

关键词：公费定向师范教育地方公费师范生在地化教育乡村教育

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Power system restoration:a literature review from 2006 to 2016

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Journal of Modern Power Systems and Clean Energy 2016年第3期4卷 332-341页

作者： yutian liu Rui FAN Vladimir TERZIJA Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250061China Department of Electrical and Electronic Engineering University of ManchesterManchester M139PLUK

Power system restoration has attracted more attention and made great progress recently. Research progress of the power system restoration from 2006 to 2016 is reviewed in this paper, including black-start, network reconfiguration and load restoration. Some emerging methods and key techniques are also discussed in the context of the integration of variable renewable energy and development of the smart grid. There is a long way to go to achieve automatic self-healing in bulk power systems because of its extreme complexity. However, rapidly developing artificial intelligence technology will eventually enable the step-by-step dynamic decision-making based on the situation awareness of supervisory control and data acquisition systems(SCADA) and wide area measurement systems(WAMS) in the near future.

关键词： Large-scale blackout Power system restoration Self-healing Smart grid Renewable energy Wide area measurement system(WAMS) Cyber attack

Aggregate modeling and analysis of air conditioning load using coupled Fokker–Planck equations

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Journal of Modern Power Systems and Clean Energy 2018年第6期6卷 1277-1290页

作者： Dingyi CHENG Wen ZHANG yutian liu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University

Demand response has gained significant attention recently with the increasing penetration of renewable energy sources in power systems. Air conditioning loads are typical thermostatically controlled loads which can play an active role in ancillary services by regulating their aggregated power consumption. The aggregation of air conditioners is essential to the control of air conditioning loads. In this paper, linear state equations are proposed to aggregate air conditioning loads by solving coupled Fokker–Planck equations(CFPEs) using the finite difference method. By analyzing the numerical stability and convergence of the difference scheme, the grid spacings, including temperature step and time step, are properly determined according to the maximal principle. Stationary solutions of the CFPEs are obtained by analytical and numerical methods. Furthermore, a classification method using dimension reduction is proposed to deal with the problem of heterogeneous parameters and interval estimation is applied to describe the stochastic behavior of air conditioning loads. The simulation results verify the effectiveness of the proposed methods.

关键词： Aggregate model Air conditioner Coupled Fokker–Planck equation Grid spacing selection Heterogeneous Interval estimation Linear state equation Stationary solution

Coordinated optimization for controlling short circuit current and multi-infeed DC interaction

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Journal of Modern Power Systems and Clean Energy 2014年第4期2卷 374-384页

作者： Dong YANG Kang ZHAO yutian liu State Grid Shandong Electric Power Research Institute Jinan 250002China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250061China

Due to increased penetration of renewable energies,DC links and other emerging technologies,power system operation and planning have to cope with various uncertainties and *** order to solve the problems of exceeding short circuit current and multi-infeed DC interaction,a coordinated optimization method is presented in this ***,a branch selection strategy is proposed by analyzing the sensitivity relationship between current limiting measures and the impedance ***,the impact of network structure changes on the multi-infeed DC system is *** the coordinated optimization model is established,which considers the cost and effect of current limiting measures,the tightness of network structure and the voltage support capability of AC system to multiple ***,the non-dominated sorting genetic algorithm II combining with the branch selection strategy,is used to find the Pareto optimal *** studies on a planning power system demonstrated the feasibility and speediness of this method.

关键词： Operation and planning Multiple DC infeed Short circuit current Sensitivity analysis Multi-objective optimization

Guest editorial: special issue on wide area monitoring, protection and control in smart grid

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Journal of Modern Power Systems and Clean Energy 2016年第3期4卷 317-318页

作者： Vladimir TERZIJA yutian liu The University of Manchester ManchesterUK Shandong University JinanChina

Complexity of modern electrical power systems is steadily *** is inspiring researchers and developers to propose new solutions capable to address a number of challenges,particularly those related to power system operation.A massive penetration of asynchronously connected renewable energy generation,the generation connected over inverters,is significantly changing the dynamics of modern power *** one hand,the power system response time is becoming shorter and at the same time the fault level is becoming *** is significantly affecting requirements of control loops,as well as power system protection.

关键词： Guest editorial protection and control in smart grid special issue on wide area monitoring

Voltage Characteristic Analysis of Ultra-high Voltage Half-wavelength Transmission System Based on Wave Process Method

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Journal of Modern Power Systems and Clean Energy 2020年第1期8卷 150-158页

作者： Hao Tian yutian liu Dong Yang Xiaohui Qin Yantao Zhang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinanChina State Grid Shandong Electric Power Research Institute JinanChina China Electric Power Research Institute BeijingChina

The voltage characteristics of a half-wavelength transmission(HWLT)system lack mechanism explanation and systematic *** this paper,both the steady-state and fault voltage characteristics are analyzed and explained based on the wave process *** analysis model is established for HWLT lines and wave propagation equations with different terminal conditions are *** steady-state conditions,voltage profiles along HWLT lines are depicted and partial overvoltage occurs when there is an overload or low-power *** addition,fault voltage characteristics are analyzed under load-rejection or short-circuit *** series resonance overvoltage will happen when short-circuit faults occur at certain positions and its peak value is influenced by grid strength or fault ***,a refined transmission line model is presented to consider non-ideal factors and simulation results demonstrate that geomorphic conditions and electromagnetic environments influence line voltage characteristics to a certain extent.

关键词： Half-wavelength transmission wave process method steady-state voltage fault voltage non-ideal factor