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Critical Contingencies Ranking for Dynamic Security Assessment Using Neural Networks
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作者 Gustavo Schweickardt Juan Manuel Gimenez-Alvarez 《Journal of Energy and Power Engineering》 2012年第10期1663-1672,共10页
A number of contingencies simulated during dynamic security assessment do not generate unacceptable values of power system state variables, due to their small influence on system operation. Their exclusion from the se... A number of contingencies simulated during dynamic security assessment do not generate unacceptable values of power system state variables, due to their small influence on system operation. Their exclusion from the set of contingencies to be simulated in the security assessment would achieve a significant reduction in computation time. This paper defines a critical contingencies selection method for on-line dynamic security assessment. The selection method results from an off-line dynamical analysis, which covers typical scenarios and also covers various related aspects like frequency, voltage, and angle analyses among others. Indexes measured over these typical scenarios are used to train neural networks, capable of performing on-line estimation of a critical contingencies list according to the system state. 展开更多
关键词 Critical contingencies dynamic security assessment neural networks.
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Integrated coordination scheduling framework of electricity-natural gas systems considering electricity transmission N—1 contingencies and gas dynamics 被引量:6
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作者 Dawei CHEN Zhejing BAO Lei WU 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2019年第6期1422-1433,共12页
This paper discusses a security-constrained integrated coordination scheduling framework for an integrated electricity-natural gas system(IEGS),in which both tight interdependence between electricity and natural gas t... This paper discusses a security-constrained integrated coordination scheduling framework for an integrated electricity-natural gas system(IEGS),in which both tight interdependence between electricity and natural gas transmission networks and their distinct dynamic characteristics at different timescales are fully considered.The proposed framework includes two linear programming models.The first one focuses on hour-based steady-state coordinated economic scheduling on power outputs of electricity generators and mass flow rates of natural gas sources while considering electricity transmission N-1 contingencies.Using the steady-state mass flow rate solutions of gas sources as the initial value,the second one studies second-based slow gas dynamics and optimizes pressures of gas sources to ensure that inlet gas pressure of gas-fired generator is within the required pressure range at any time between two consecutive steady-state scheduling.The proposed framework is validated via an IEGS consisting of an IEEE 24-bus electricity network and a15-node 14-pipeline natural gas network coupled by gasfired generators.Numerical results illustrate the effectiveness of the proposed framework in coordinating electricity and natural gas systems as well as achieving economic and reliable operation of IEGS. 展开更多
关键词 GAS dynamics INTEGRATED electricity-natural GAS system N—1 contingencies Optimization Scheduling
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Allocation of a Variable Series Reactor Considering AC Constraints and Contingencies 被引量:1
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作者 Xiaohu Zhang Chunlei Xu +5 位作者 Di Shi Zhiwei Wang Qibing Zhang Guodong Liu Kevin Tomsovic Aleksandar Dimitrovski 《CSEE Journal of Power and Energy Systems》 SCIE CSCD 2019年第1期63-72,共10页
The Variable Series Reactors(VSRs)can efficiently control the power flow through the adjustment of the line reactance.When they are appropriately allocated in the power network,the transmission congestion and generati... The Variable Series Reactors(VSRs)can efficiently control the power flow through the adjustment of the line reactance.When they are appropriately allocated in the power network,the transmission congestion and generation cost can be reduced.This paper proposes a planning model to optimally allocate VSRs considering AC constraints and multi-scenarios including base case and contingencies.The planning model is originally a non-convex large scale mixed integer nonlinear program(MINLP),which is generally intractable.The proposed Benders approach decomposes the MINLP model into a mixed integer linear program(MILP)master problem and a number of nonlinear subproblems.Numerical case studies based on IEEE 118-bus demonstrate the high performance of the proposed approach. 展开更多
关键词 N-1 contingencies optimization optimal power flow variable series reactor transmission network
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Self-Compassion Moderates the Effect of Contingent Self-Esteem on Well-Being:Evidence from Cross-Sectional Survey and Experiment
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作者 Ruirui Zhang Xuguang Zhang +1 位作者 Minxin Yang Haoran Zhang 《International Journal of Mental Health Promotion》 2024年第2期117-126,共10页
Contingent self-esteem captures the fragile nature of self-esteem and is often regarded as suboptimal to psychological functioning.Self-compassion is another important self-related concept assumed to promote mental he... Contingent self-esteem captures the fragile nature of self-esteem and is often regarded as suboptimal to psychological functioning.Self-compassion is another important self-related concept assumed to promote mental health and well-being.However,research on the relation of self-compassion to contingent self-esteem is lacking.Two studies were conducted to explore the role of selfcompassion,either as a personal characteristic or an induced mindset,in influencing the effects of contingent self-esteem on well-being.Study 1 recruited 256 Chinese college students(30.4%male,mean age=21.72 years)who filled out measures of contingent self-esteem,self-compassion,and well-being.The results found that self-compassion moderated the effect of contingent self-esteem on well-being.In Study 2,a sample of 90 Chinese college students(34%male,mean age=18.39 years)were randomly assigned to either a control or self-compassion group.They completed baseline trait measures of contingent self-esteem,self-compassion,and self-esteem.Then,they were led to have a 12-min break(control group)or listen to a 12-min self-compassion audio(self-compassion group),followed by a social stress task and outcome measures.The results demonstrated the effectiveness of the brief self-compassion training and its moderating role in influencing the effects of contingent self-esteem on negative affects after the social stress task.This research provides implications that to equip with a self-compassionate mindset could lower the risk of the impairment of well-being associated with elements of contingent selfesteem,which involves a fragile sense of self-worth.It may also provide insights into the development of an“optimal selfesteem”and the improvement of well-being. 展开更多
关键词 SELF-COMPASSION contingent self-esteem WELL-BEING social evaluative threat
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Preserving environmental quality of ecotourism sites through community participation in Purulia District of West Bengal,India
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作者 Piyall CHATTERJEE Soumyendra Kishore DATTA 《Regional Sustainability》 2024年第3期111-123,共13页
The importance of valuing environmental resources,especially in ecotourism sites,has become increasingly important over the last two decades.Ecotourism is now considered as an important source of livelihood of local s... The importance of valuing environmental resources,especially in ecotourism sites,has become increasingly important over the last two decades.Ecotourism is now considered as an important source of livelihood of local stakeholders in backward regions.Therefore,the preservation of ecotourism sites through community participation seems very important to maintain continued flow of tourists.This study aimed at recognizing the importance of community participation for the preservation of ecotourism sites.For this,this study executed a survey based on non-probability sampling in two ecotourism sites(Garpanchkot and Baranti)covering 100 respondents in Purulia District,West Bengal of India.The central issue of this study was to assess the tendency of community participation for the conservation of ecotourism sites and find the optimum condition for offering participatory labour time.This study showed that the participation of young people is high,and the majority of respondents are aware of the importance in protecting ecotourism sites.Because respondents were too poor to offer money,the contingent valuation method(CVM)was used to elicit their willingness to pay(WTP)participatory labour time for the conservation of ecotourism sites.Respondents’age,income,education level,caste,and their perceived environmental quality had significant relationship with their WTP participatory labour time by applying the ordinary least square(OLS)model.It was found that the mean WTP participatory labour time of each respondent in a month is approximately 3.64 h.The significance of this study is that community participation can improve the sense of belonging,trust,and credibility of ecotourism sites,making them more appreciative of the value and protection of these sites. 展开更多
关键词 Ecotourism site conservation Community participation Local stakeholders Willingness to pay Participatory labour time Ordinary least square(OLS)model Contingent valuation method(CVM)
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向量集值优化超有效解的对偶问题 被引量:6
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作者 盛宝怀 周颂平 刘三阳 《数学物理学报(A辑)》 CSCD 北大核心 2004年第4期426-434,共9页
借助于Contingent切锥和集值映射的上图而引入的有关集值映射的Contingent切导数, 对约束集值优化问题的超有效解建立了最优性Kuhn-Tucker必要及充分性条件,借此建立了 向量集值优化超有效解的Wolfe型和Mond-Weir型对偶定理.
关键词 Contingent切锥 集值映射 对偶
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集值映射的超有效广义梯度 被引量:6
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作者 徐义红 肖明丽 《南昌大学学报(工科版)》 CAS 2008年第2期127-130,共4页
在Hausdorff局部凸拓扑线性空间中,对于集值优化问题(SOP),利用contingent上图切导数,引进了集值映射超有效意义下的广义梯度,在目标函数为锥类凸的集值映射并且具有连通性条件下,利用凸集分离定理和contingent上图切导数,证明了集值映... 在Hausdorff局部凸拓扑线性空间中,对于集值优化问题(SOP),利用contingent上图切导数,引进了集值映射超有效意义下的广义梯度,在目标函数为锥类凸的集值映射并且具有连通性条件下,利用凸集分离定理和contingent上图切导数,证明了集值映射超有效广义梯度的存在性,得到了集值映射超有效广义梯度的等价刻画等定理。 展开更多
关键词 超有效广义梯度 contingent上图切导数 超有效性 最优性条件
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两期交换经济Contingent资产市场的指标公式
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作者 梁希泉 庄新路 《东北师大学报(自然科学版)》 CAS CSCD 1997年第3期1-6,共6页
给出了均衡流形的定向,推导出了两期交换经济Contingent资产市场的指标公式,并证明了该资产市场的均衡存在.从而证实了M.Magill“当均衡流形可定向,且Incometransfers矩阵V(p,s)是满秩阵时,可以得到定向映射度的指标公式”的推测.
关键词 CONTINGENT 资产市场 均衡流形 指标公式 均衡点
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弱有效意义下向量集值优化的Kuhn-Tucker条件与对偶
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作者 盛宝怀 李宏涛 陈志祥 《宁波大学学报(理工版)》 CAS 2003年第1期18-24,共7页
借助于由广义Contingent切锥并用上图而引入有关集值映射的Contingent切导数,对约束集值优化问题的弱有效解建立了Kuhn-Tucker必要及充分性条件,由此建立了向量集值优化弱有效解的Welfe型和Mond-Weir型对偶的弱定理、正定理及逆定理。
关键词 向量集值优化 集值映射 广义Contingent切锥 弱有效解 KUHN-TUCKER条件 多目标规划 对偶
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Banach空间中优化问题的最优性条件
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作者 张秀芳 王冬 《高校应用数学学报(A辑)》 CSCD 北大核心 2002年第2期225-229,共5页
首先在 Contingent切锥意义下界定了 Banach空间中非空集合的伪切锥和伪凸性的概念 ,并讨论了相应的性质 ;然后针对可微优化问题 ,在广义凸性假设下 。
关键词 BANACH空间 优化问题 最优性条件 Contingent切锥 伪切锥 伪凸集合 伪凸函数
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Evaluation on Non-use Value of Dianchi Lake Wetland Using CVM
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作者 谭喨 刘春学 +2 位作者 王鹏云 徐杉 曾燕 《Agricultural Science & Technology》 CAS 2012年第3期617-622,共6页
[Objective] This study was to analyze the personal Willingness to Pay (WI-P) on the non-use value of Dianchi lake wetland and the influential factors. [Method] Questionnaire was designed according to the Contingent ... [Objective] This study was to analyze the personal Willingness to Pay (WI-P) on the non-use value of Dianchi lake wetland and the influential factors. [Method] Questionnaire was designed according to the Contingent Valuation Method (CVM) to investigate people of different occupations at different ages, based on which the evaluation on non-use value of Dianchi lake wetland was carried out. And the relationship between WTP and social characteristics were analyzed by using non- parametric estimation. [Result] The average WTP on Dianchi lake wetland is 150.03- 217.66 yuan per person every year, and the total WTP is 626-909 million yuan ev- ery year. Age, education and residence of the respondents have remarkable influ- ence on the VVTP. The influence of education level and residence on option value is significant; bequest value is significantly correlated with age; while there is no significant relationship between existence value and social characteristics. [Conclusion] The evaluation on the non-use value of Dianchi lake wetland is important for the scientific development and utilization of wetland resources. 展开更多
关键词 CVM (Contingent Valuation Method) Dianchi lake wetland Non-use value WTP (Willingness to Pay)
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广义梯度和ε-严有效解的最优性条件
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作者 余丽 《应用泛函分析学报》 CSCD 2013年第1期42-46,共5页
在锥序Banach空间中引入了集值映射ε-严有效意义下的广义梯度.在连通性条件下,利用凸集分离定理证明了该广义梯度的存在性.作为应用,给出了用广义梯度刻画集值优化问题ε-严有效解的充分和必要条件.
关键词 集值优化 Contingent切导数 ε-严有效解 广义梯度 最优性条件
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向量集值函数松弛型弱有效鞍点元的存在性
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作者 李宏涛 《宝鸡文理学院学报(自然科学版)》 CAS 2001年第1期8-9,12,共3页
借助于向量集值函数的 Contingent切导数建立了松弛型弱有效鞍点元存在的必要及充分性条件。
关键词 Contingent切导数 向量集值函数 松弛型弱有效鞍点元 存在性 集值映射 凸集
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Hospitalization Can Correct Behavioral Feeding Disorders in Children by Resetting the Pedagogic Climate
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作者 Ellen van der Gaag Miriam Münow 《Open Journal of Pediatrics》 2014年第2期135-142,共8页
Background: Behavioral feeding disorders are common among children, which sometimes become progressive, and consequently, children may refuse to eat anything. Parents have lots of difficulties to reset such a disturbe... Background: Behavioral feeding disorders are common among children, which sometimes become progressive, and consequently, children may refuse to eat anything. Parents have lots of difficulties to reset such a disturbed eating pattern. The aim of this study was to perform an analysis of clinical intervention in behavioral feeding disorders in young children. Methods: We conducted a retrospective analysis of data of 28 children aged 1 - 9 years with behavioral feeding disorders. A pediatrician and pediatric social worker conducted the training in two groups: outpatient or inpatient setting. Both groups were treated with parental education and guidance. The inpatient group also had a temporarily (2 weeks) resetting of the pedagogic climate in a pediatric ward of a general hospital under guidance of a pediatric social worker. Results: Almost all parents were inconsistent in applying appropriate behavioral contingencies during meals. Eleven patients followed 8 months of outpatient treatment and 25 patients followed 2 weeks of inpatient treatment. The overall success rate of outpatient treatment after 2 weeks was 18%, and that of inpatient treatment after 8 months was 88%. The corrected relapse rates are 18% and 56% respectively after 6 months. Conclusion: Short clinical intervention in a structured pedagogic environment is a successful treatment in behavioral feeding disorders. Herewith, pediatricians have a powerful tool for treating behavioral feeding disorders by temporarily resetting and changing the pedagogic climate. 展开更多
关键词 BEHAVIORAL Feeding Disorder HOSPITALISATION BEHAVIORAL contingencies PEDIATRICS
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Demand and Response in Smart Grids for Modern Power System
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作者 Muhammad Qamar Raza Muhammad Usman Haider +2 位作者 S. Muhammad Ali Muhammad Zeeshan Rashid Farooq Sharif 《Smart Grid and Renewable Energy》 2013年第2期133-136,共4页
Micro-grid plays a vital role in fulfilling the increasing demand by using distributed renewable energy resources. Demand and response technique can be broadly classified under the setup DR deployed (e.g. ISO’s/RTO’... Micro-grid plays a vital role in fulfilling the increasing demand by using distributed renewable energy resources. Demand and response technique can be broadly classified under the setup DR deployed (e.g. ISO’s/RTO’s). Demand response program can be implemented to improve power system quality, reliability and increasing demand. In modern power industry, strategic player can take more benefit from more emphasized DR study in terms of social benefit (uninterrupted power supply to consumers) and economy. This paper proposes the distributed micro-grid control and implemented control setup implemented demand response algorithm, which provides better power system reliability. This paper presents contingencies control demand and response for micro-grid. The main advantage of implementation of demand and response algorithms in Micro-grids provides reliable power supplies to consumers. The proposed micro-grid TCP/IP setup provides a chance to respond the contingencies to recover the shed to active condition. Micro-grid controller implements demand and response algorithm reasonable for managing the demand of the load and intelligent load scheme in case of blackout. 展开更多
关键词 DEMAND RESPONSE (DR) Micro-Grid (MG) POWER SYSTEM Reliability Distributed Generation (DG) Renewable Energy Resources (RER) POWER SYSTEM contingencies
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向量集值优弱有效解的Kuhn-Tucker条件(英文)
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作者 吴明鑫 《陕西科技大学学报(自然科学版)》 2000年第3期82-86,共5页
借助于 Contingent切导数建立了向量集值优化弱有效解的 Kuhn- Tucker条件 ,而且在某些凸性的要求下证明这一条件还为充分的 .
关键词 集值映射 KUHN-TUCKER条件 Contingent切导数 弱有效
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用二阶切导数刻画集值优化ε-严有效元
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作者 余丽 赖海洋 刘群 《宜春学院学报》 2015年第6期33-34,共2页
在实赋范空间中利用集值映射的二阶导数,建立了无约束的集值优化问题ε-严有效元的二阶切导数的必要最优性条件。
关键词 ε-严有效元 二阶Contingent切导数 必要条件 最优性条件
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ε-严最大有效意义下集值优化的高阶最优性条件
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作者 余丽 《宜春学院学报》 2013年第6期26-27,共2页
在实赋范线性空间中讨论集值优化问题ε-严最大有效解的高阶最优性条件。利用Li等引入的高阶导数,借助ε-严最大有效解的性质,给出了受约束于固定集的集值优化问题取得ε-严最大有效解的高阶导数型最优性必要条件。
关键词 ε-严最大有效解 m-阶Contingent切导数 必要条件 最优性条件
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集值优化问题强有效元的高阶Mond-Weir型对偶
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作者 谢雪军 《宜春学院学报》 2016年第12期42-45,共4页
在Banach空间中研究集值优化在强有效元意义下的高阶Mond-weir型对偶问题。在内部锥类凸假设下,利用高阶Contingent切导数的性质,借助凸集分离定理建立了强对偶定理,并得到了逆对偶问题。
关键词 强有效元 m-阶Contingent切导数 高阶Mond-Weir型对偶 最优性条件
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集值优化问题严最大有效解的高阶刻画 被引量:3
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作者 杨扬 徐义红 熊卫芝 《运筹学学报》 CSCD 2011年第2期103-109,共7页
在实赋范线性空间中考虑集值优化问题的严有效性.利用高阶导数的性质给出了受约束于固定集的集值优化问题取得严最大有效解的高阶导数型最优性必要条件.当目标函数为锥凹集值映射时,利用严最大有效点的性质得到集值优化问题取得严最大... 在实赋范线性空间中考虑集值优化问题的严有效性.利用高阶导数的性质给出了受约束于固定集的集值优化问题取得严最大有效解的高阶导数型最优性必要条件.当目标函数为锥凹集值映射时,利用严最大有效点的性质得到集值优化问题取得严最大有效解的充分条件. 展开更多
关键词 严最大有效解 m-阶Contingent切导数 集值优化
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