为了提高主动配电网(active distribution network,ADN)内设备的互操作性以及信息通信系统的实用性,提出了一种基于IEC61850标准和多代理系统(multi-agent system,MAS)的ADN信息通信架构以及基于万维网服务(Web Service)的通信流程。首...为了提高主动配电网(active distribution network,ADN)内设备的互操作性以及信息通信系统的实用性,提出了一种基于IEC61850标准和多代理系统(multi-agent system,MAS)的ADN信息通信架构以及基于万维网服务(Web Service)的通信流程。首先基于IEC61850-7-420分布式能源标准和IEC61400-25-2风电标准新定义的逻辑节点对ADN"源、网、荷"设备的统一信息建模进行归纳与分析;然后利用IEC61850定义的信息模型作为代理间消息传递的统一形式,将其映射到代理通信语言(agent communication language,ACL)的本体元素中,实现IEC61850和MAS的融合,并给出了基于Java语言的代理开发框架(agent development framework,JADE)平台上的映射实例;最后通过将跨平台Web Service引入到代理通信架构,实现了多代理和Web Service的双向互联。仿真试验验证了ADN代理之间通信以及利用Web Service进行跨平台通信的可行性。展开更多
Today the cycle time of the product develop is requ ir ed to be shortened. At the same time the requirement of the customers becomes mo re and more diverse and complex. The capability of the develop unit is limited b ...Today the cycle time of the product develop is requ ir ed to be shortened. At the same time the requirement of the customers becomes mo re and more diverse and complex. The capability of the develop unit is limited b ecause of the existence of heterogeneous systems and distributed environments. I n this paper, we bring forward a new approach to solve the problem in product de velopment process. We also settle part key technologies in it. A great deal of information from all kinds of sources in the distributed develop ment process is interweaved. The solution to organize the workflow and manage th e information in the process is called for anxiously. We use a new approach that is asynchronous and synchronous coupling product development approach based on the network. The approach extends the develop process from the time axis. Then t he activities in the process are organized from the asynchronous and synchronous aspects. The state of every activity projects at the ASN (active semantic netwo rk). The ASN includes decision system, intelligent agent, user interface and net work. The ASN decides the types and states of the activities and deals with the couple relationship among them. The knowledge stored in ASN is open to all users through the relative interfaces. Every specialist keeps contact with their user s relying on collaborative platform implements CSCW (computer support collaborat ive work) that integrated product/process design and development. The lack of gl obal communication in product development process can be prevented in the most d egree. The key technologies that exist in the asynchronous and synchronous coupling pro duct develop approach include: integrated development structure, orderly organiz ation of information, transparent management of process, agile transfer of infor mation and rapid prototype. The development process can be completed quickly by these technologies. The technologies involve wide content. In this paper, we dis cuss some key technologies. We validate the approach by the projectrapid response manufacturing a pplication in the distributed environment. The expensive device, high technology and low using lead to RE (Rapid engineering) and RP (Rapid prototype) service a pplication by the network. RE and RP develop rapidly due to the accelerated prod uct development process. RE and RP application service platform is built in the project.展开更多
An analytical algorithm was presented for the exact computation of the probability distribution of the project completion time in stochastic networks,where the activity durations are mutually independent and continuou...An analytical algorithm was presented for the exact computation of the probability distribution of the project completion time in stochastic networks,where the activity durations are mutually independent and continuously distributed random variables. Firstly,stochastic activity networks were modeled as continuous-time Markov process with a single absorbing state by the well-know method of supplementary variables and the time changed from the initial state to absorbing state is equal to the project completion time.Then,the Markov process was regarded as a special case of Markov skeleton process.By taking advantage of the backward equations of Markov skeleton processes,a backward algorithm was proposed to compute the probability distribution of the project completion time.Finally,a numerical example was solved to demonstrate the performance of the proposed methodology.The results show that the proposed algorithm is capable of computing the exact distribution function of the project completion time,and the expectation and variance are obtained.展开更多
为了解决高比例分布式电源(distributed generation,DG)大规模并网后实时量测数目缺失、传统预测辅助状态估计方法(forecasting-aided state estimation,FASE)估计精度有限等问题,提出了基于改进Crossformer伪量测构建的主动配电网FASE...为了解决高比例分布式电源(distributed generation,DG)大规模并网后实时量测数目缺失、传统预测辅助状态估计方法(forecasting-aided state estimation,FASE)估计精度有限等问题,提出了基于改进Crossformer伪量测构建的主动配电网FASE方法。首先,基于最大信息系数法(maximal information coefficient,MIC)筛选出高相关性的输入特征,提高预测模型的精度;然后,通过全变差正则化技术(total variation regularized,TV)优化鲁棒主成分分析法(robust principal component analysis,RPCA),构建TRPCA层,并将其嵌入到Crossformer中,以填补Crossformer无法有效处理非高斯噪声的空白;最后,利用改进的预测模型进行超短期负荷预测,经潮流计算得到节点伪量测,在量测不足情况下补全缺失数据,并结合扩展卡尔曼滤波器(extended Kalman filter,EKF)进行状态估计。在IEEE 33节点和IEEE 118节点标准配电网上进行仿真测试,结果表明所提方法在估计精度和鲁棒性等方面具有一定优势,可为主动配电网FASE提供参考。展开更多
针对现有配电网有源电压消弧方法未充分考虑线路电压降落以及分布式电源接入的影响,发生单相接地故障时无法保证故障点电压为0,存在无法可靠消弧的问题,提出了一种考虑分布式电源接入的配电网有源电压消弧技术。首先,在接入分布式电源...针对现有配电网有源电压消弧方法未充分考虑线路电压降落以及分布式电源接入的影响,发生单相接地故障时无法保证故障点电压为0,存在无法可靠消弧的问题,提出了一种考虑分布式电源接入的配电网有源电压消弧技术。首先,在接入分布式电源的基础上,考虑线路的电压降落,推导消弧电压理论计算公式,提出改进有源电压消弧方法。其次,提出一种基于馈线终端设备(feeder terminal unit, FTU)量测数据的数据驱动测距方法,能够在故障发生后准确计算出故障距离,为消弧线圈的控制提供数据。最后,通过仿真证明所提方法相较于传统有源电压消弧方法,能够更好地控制故障点电压为0。展开更多
文摘为了提高主动配电网(active distribution network,ADN)内设备的互操作性以及信息通信系统的实用性,提出了一种基于IEC61850标准和多代理系统(multi-agent system,MAS)的ADN信息通信架构以及基于万维网服务(Web Service)的通信流程。首先基于IEC61850-7-420分布式能源标准和IEC61400-25-2风电标准新定义的逻辑节点对ADN"源、网、荷"设备的统一信息建模进行归纳与分析;然后利用IEC61850定义的信息模型作为代理间消息传递的统一形式,将其映射到代理通信语言(agent communication language,ACL)的本体元素中,实现IEC61850和MAS的融合,并给出了基于Java语言的代理开发框架(agent development framework,JADE)平台上的映射实例;最后通过将跨平台Web Service引入到代理通信架构,实现了多代理和Web Service的双向互联。仿真试验验证了ADN代理之间通信以及利用Web Service进行跨平台通信的可行性。
文摘Today the cycle time of the product develop is requ ir ed to be shortened. At the same time the requirement of the customers becomes mo re and more diverse and complex. The capability of the develop unit is limited b ecause of the existence of heterogeneous systems and distributed environments. I n this paper, we bring forward a new approach to solve the problem in product de velopment process. We also settle part key technologies in it. A great deal of information from all kinds of sources in the distributed develop ment process is interweaved. The solution to organize the workflow and manage th e information in the process is called for anxiously. We use a new approach that is asynchronous and synchronous coupling product development approach based on the network. The approach extends the develop process from the time axis. Then t he activities in the process are organized from the asynchronous and synchronous aspects. The state of every activity projects at the ASN (active semantic netwo rk). The ASN includes decision system, intelligent agent, user interface and net work. The ASN decides the types and states of the activities and deals with the couple relationship among them. The knowledge stored in ASN is open to all users through the relative interfaces. Every specialist keeps contact with their user s relying on collaborative platform implements CSCW (computer support collaborat ive work) that integrated product/process design and development. The lack of gl obal communication in product development process can be prevented in the most d egree. The key technologies that exist in the asynchronous and synchronous coupling pro duct develop approach include: integrated development structure, orderly organiz ation of information, transparent management of process, agile transfer of infor mation and rapid prototype. The development process can be completed quickly by these technologies. The technologies involve wide content. In this paper, we dis cuss some key technologies. We validate the approach by the projectrapid response manufacturing a pplication in the distributed environment. The expensive device, high technology and low using lead to RE (Rapid engineering) and RP (Rapid prototype) service a pplication by the network. RE and RP develop rapidly due to the accelerated prod uct development process. RE and RP application service platform is built in the project.
基金Project(10671212) supported by the National Natural Science Foundation of ChinaProject(20050533036) supported by the Specialized Research Found for the Doctoral Program Foundation of Higher Education of China
文摘An analytical algorithm was presented for the exact computation of the probability distribution of the project completion time in stochastic networks,where the activity durations are mutually independent and continuously distributed random variables. Firstly,stochastic activity networks were modeled as continuous-time Markov process with a single absorbing state by the well-know method of supplementary variables and the time changed from the initial state to absorbing state is equal to the project completion time.Then,the Markov process was regarded as a special case of Markov skeleton process.By taking advantage of the backward equations of Markov skeleton processes,a backward algorithm was proposed to compute the probability distribution of the project completion time.Finally,a numerical example was solved to demonstrate the performance of the proposed methodology.The results show that the proposed algorithm is capable of computing the exact distribution function of the project completion time,and the expectation and variance are obtained.
文摘为了解决高比例分布式电源(distributed generation,DG)大规模并网后实时量测数目缺失、传统预测辅助状态估计方法(forecasting-aided state estimation,FASE)估计精度有限等问题,提出了基于改进Crossformer伪量测构建的主动配电网FASE方法。首先,基于最大信息系数法(maximal information coefficient,MIC)筛选出高相关性的输入特征,提高预测模型的精度;然后,通过全变差正则化技术(total variation regularized,TV)优化鲁棒主成分分析法(robust principal component analysis,RPCA),构建TRPCA层,并将其嵌入到Crossformer中,以填补Crossformer无法有效处理非高斯噪声的空白;最后,利用改进的预测模型进行超短期负荷预测,经潮流计算得到节点伪量测,在量测不足情况下补全缺失数据,并结合扩展卡尔曼滤波器(extended Kalman filter,EKF)进行状态估计。在IEEE 33节点和IEEE 118节点标准配电网上进行仿真测试,结果表明所提方法在估计精度和鲁棒性等方面具有一定优势,可为主动配电网FASE提供参考。
文摘针对现有配电网有源电压消弧方法未充分考虑线路电压降落以及分布式电源接入的影响,发生单相接地故障时无法保证故障点电压为0,存在无法可靠消弧的问题,提出了一种考虑分布式电源接入的配电网有源电压消弧技术。首先,在接入分布式电源的基础上,考虑线路的电压降落,推导消弧电压理论计算公式,提出改进有源电压消弧方法。其次,提出一种基于馈线终端设备(feeder terminal unit, FTU)量测数据的数据驱动测距方法,能够在故障发生后准确计算出故障距离,为消弧线圈的控制提供数据。最后,通过仿真证明所提方法相较于传统有源电压消弧方法,能够更好地控制故障点电压为0。
