Due to the increasing share of renewable energy, new requirements are placed on control room software. Such software is often exclusive to the supplier, but other suppliers could offer new and better methods. For secu...Due to the increasing share of renewable energy, new requirements are placed on control room software. Such software is often exclusive to the supplier, but other suppliers could offer new and better methods. For security reasons, external applications often have no direct data access to control room software. Such software can provide information about the power grid via a periodic file transfer in CIM (Common Information Model) format. These files are often very large, containing complete records, delivering information not always relevant to the external applications. Extracting the relevant information required by external applications can be time-consuming, thus presenting a problem for time-critical applications. This paper presents a method allowing different applications to efficiently access the relevant data from the massive data stream contained in the CIM files. This method has been tested with a distribution system operator and clearly increases performance, allowing different applications to access the relevant data.展开更多
Integration of Solar Photovoltaic (PV) generation into an existing distribution system has many impacts on the system, with the power flow being one of the major issues. This impact is not generic for any network, but...Integration of Solar Photovoltaic (PV) generation into an existing distribution system has many impacts on the system, with the power flow being one of the major issues. This impact is not generic for any network, but it may manifest itself either positively or negatively, depending on the grid configuration, interface control modes, operation mode, and load profile. Grid-connected PV systems have three control options of the local voltage controller of the interface DC-AC converter. These control modes are Power Factor control, voltage control, and Droop Voltage control. This paper aims at evaluating and comparing the impacts of those control modes on the grid power flow. A set of evaluation criteria and indices is defined and mathematically formulated. Based on the requirements of the used program (Power Factory Dig Silent V14.1.3), a computation plan (algorithm) has been proposed. The algorithm has been applied to a typical weak network and a wide range of simulations has been carried out. Simulation results have been thoroughly discussed and important findings have been concluded.展开更多
The Smart Grid has three main characteristics, which are to some degree antagonistic. These characteristics are: provision of good power quality, energy cost reduction and improvement in the reliability of the grid. T...The Smart Grid has three main characteristics, which are to some degree antagonistic. These characteristics are: provision of good power quality, energy cost reduction and improvement in the reliability of the grid. The need to ensure that they can be accomplished together demands a much richer ICT monitoring and control network than the current system. In this paper we particularly investigate the design and deployment of the ICT system in the urban environment, specifically in a university campus that is embedded in a city, thus it represents the Neighbourhood Area Network (NAN) level of the Smart Grid. In order to design an ICT infrastructure, we have introduced two related architectures: namely communications network architecture and a software architecture. Having access to the characteristics of a real NAN guides us to choose appropriate communication technologies and identify the actual requirements of the system. To implement these architectures at this level we need to gather and process information from environmental sensors (monitoring e.g. temperature, movement of people and vehicles) that can provide useful information about changes in the loading of the NAN, with information from instrumentation of the Power Grid itself. Energy constraints are one of the major limitations of the communication network in the Smart Grid, especially where wireless networking is proposed. Thus we analyse the most energy efficient method of collecting and sending data. The main contribution of this research is that we propose and implement an energy efficient ICT network and describe our software architecture at the NAN level, currently very underdeveloped. We also discuss our experimental results. To our knowledge, no such architectures have yet been implemented for collecting data which can provide the basis of Decision Support Tools (DSTs).展开更多
针对现有智能电网中处理单一数据流的局限性和不完善的安全性问题,提出利用软件定义网络(software defined network,SDN)控制基于IEC61850的智能电网系统;实现了OpenFlow、sFlow和OF-Config协议,可根据网络状态和自身需求确定不同数据...针对现有智能电网中处理单一数据流的局限性和不完善的安全性问题,提出利用软件定义网络(software defined network,SDN)控制基于IEC61850的智能电网系统;实现了OpenFlow、sFlow和OF-Config协议,可根据网络状态和自身需求确定不同数据流类型;基于IEC 61850变电站网络管理和控制的商业软件通常必须是专有系统,通过标准解决方案实现了通用性;首先,给出SDN框架下的数据层解耦控制和管理(C&M);然后,参考CEN–CENELEC–ETSI智能电网协调小组,介绍所提系统的功能与应用;最后,在Mininet网络模拟器上实现并验证系统性能,实验结果表明,所提系统在流量控制检测、DOS攻击检测和负载均衡检测方面均有突出表现。展开更多
针对电力电子装置传统开发模式中研发周期长,代码测试及验证费时费力等缺点。利用基于模型的设计方法,成功研制了一台1.5 k W无差拍控制的单级式单相光伏并网逆变器,从单相光伏并网逆变器的基本原理直至整个系统的实现,详细叙述了基于...针对电力电子装置传统开发模式中研发周期长,代码测试及验证费时费力等缺点。利用基于模型的设计方法,成功研制了一台1.5 k W无差拍控制的单级式单相光伏并网逆变器,从单相光伏并网逆变器的基本原理直至整个系统的实现,详细叙述了基于模型设计的过程及方法,展现了该方法的优越性。结果显示,采用该方法可以显著增强代码的可靠性、可移植性、易读性及易测试和验证性,省去了人工编写控制器代码及测试验证代码环节,极大地缩短了开发周期。展开更多
文摘Due to the increasing share of renewable energy, new requirements are placed on control room software. Such software is often exclusive to the supplier, but other suppliers could offer new and better methods. For security reasons, external applications often have no direct data access to control room software. Such software can provide information about the power grid via a periodic file transfer in CIM (Common Information Model) format. These files are often very large, containing complete records, delivering information not always relevant to the external applications. Extracting the relevant information required by external applications can be time-consuming, thus presenting a problem for time-critical applications. This paper presents a method allowing different applications to efficiently access the relevant data from the massive data stream contained in the CIM files. This method has been tested with a distribution system operator and clearly increases performance, allowing different applications to access the relevant data.
文摘Integration of Solar Photovoltaic (PV) generation into an existing distribution system has many impacts on the system, with the power flow being one of the major issues. This impact is not generic for any network, but it may manifest itself either positively or negatively, depending on the grid configuration, interface control modes, operation mode, and load profile. Grid-connected PV systems have three control options of the local voltage controller of the interface DC-AC converter. These control modes are Power Factor control, voltage control, and Droop Voltage control. This paper aims at evaluating and comparing the impacts of those control modes on the grid power flow. A set of evaluation criteria and indices is defined and mathematically formulated. Based on the requirements of the used program (Power Factory Dig Silent V14.1.3), a computation plan (algorithm) has been proposed. The algorithm has been applied to a typical weak network and a wide range of simulations has been carried out. Simulation results have been thoroughly discussed and important findings have been concluded.
文摘The Smart Grid has three main characteristics, which are to some degree antagonistic. These characteristics are: provision of good power quality, energy cost reduction and improvement in the reliability of the grid. The need to ensure that they can be accomplished together demands a much richer ICT monitoring and control network than the current system. In this paper we particularly investigate the design and deployment of the ICT system in the urban environment, specifically in a university campus that is embedded in a city, thus it represents the Neighbourhood Area Network (NAN) level of the Smart Grid. In order to design an ICT infrastructure, we have introduced two related architectures: namely communications network architecture and a software architecture. Having access to the characteristics of a real NAN guides us to choose appropriate communication technologies and identify the actual requirements of the system. To implement these architectures at this level we need to gather and process information from environmental sensors (monitoring e.g. temperature, movement of people and vehicles) that can provide useful information about changes in the loading of the NAN, with information from instrumentation of the Power Grid itself. Energy constraints are one of the major limitations of the communication network in the Smart Grid, especially where wireless networking is proposed. Thus we analyse the most energy efficient method of collecting and sending data. The main contribution of this research is that we propose and implement an energy efficient ICT network and describe our software architecture at the NAN level, currently very underdeveloped. We also discuss our experimental results. To our knowledge, no such architectures have yet been implemented for collecting data which can provide the basis of Decision Support Tools (DSTs).
文摘针对现有智能电网中处理单一数据流的局限性和不完善的安全性问题,提出利用软件定义网络(software defined network,SDN)控制基于IEC61850的智能电网系统;实现了OpenFlow、sFlow和OF-Config协议,可根据网络状态和自身需求确定不同数据流类型;基于IEC 61850变电站网络管理和控制的商业软件通常必须是专有系统,通过标准解决方案实现了通用性;首先,给出SDN框架下的数据层解耦控制和管理(C&M);然后,参考CEN–CENELEC–ETSI智能电网协调小组,介绍所提系统的功能与应用;最后,在Mininet网络模拟器上实现并验证系统性能,实验结果表明,所提系统在流量控制检测、DOS攻击检测和负载均衡检测方面均有突出表现。
文摘针对电力电子装置传统开发模式中研发周期长,代码测试及验证费时费力等缺点。利用基于模型的设计方法,成功研制了一台1.5 k W无差拍控制的单级式单相光伏并网逆变器,从单相光伏并网逆变器的基本原理直至整个系统的实现,详细叙述了基于模型设计的过程及方法,展现了该方法的优越性。结果显示,采用该方法可以显著增强代码的可靠性、可移植性、易读性及易测试和验证性,省去了人工编写控制器代码及测试验证代码环节,极大地缩短了开发周期。
基金教育部留学回国人员科研启动基金资助项目(08002410012)中央高校基本科研业务费专项资金资助(0800219169)+2 种基金Supported by SRF for ROCSSEM(08002410012)Fundamental Research Funds for the Central Universities(0800219169)
