Architecture Design for Integrated Wide Area Protection and Control Systems

This paper firstly reviews the recent development in power system protection and control, with special attention paid to the wide-area and integrated protection, in order to look into future development of integration of protection and control for smart grids. This paper mainly reports on the development of integrated wide area protection and control for power systems. The concept of integrated wide area protection and control is introduced, in which a hierarchical protection and control system provides the protection and control of wide area or regional power substations/ plants and their associated power network. The system is mainly divided into three levels, the local, the substation/plant and the wide area/regional protection and control. The integrated functions at each level are described in details with an aim to develop an optimal coordination mechanism between the levels. One of the core elements in the system is the synchronised wide area communication network between the substations and the protection and control system, in which latest communication technology is employed. Another important player in the system is the wide area synchronized protection and control information platform, which not only enables the fusion three line of defence for power system protection and control, but also provides a perfect tool for the application of cloud computing to substations and power networks.

Advancement in Wide Area Monitoring Protection and Control Using PMU’s Model in MATLAB/SIMULINK

A big step forward to improve power system monitoring and performance, continued load growth without a corresponding increase in transmission resources has resulted in reduced operational margins for many power systems worldwide and has led to operation of power systems closer to their stability limits and to power exchange in new patterns. These issues, as well as the on-going worldwide trend towards deregulation of the entire industry on the one hand and the increased need for accurate and better network monitoring on the other hand, force power utilities exposed to this pressure to demand new solutions for wide area monitoring, protection and control. Wide-area monitoring, protection, and control require communicating the specific-node information to a remote station but all information should be time synchronized so that to neutralize the time difference between information. It gives a complete simultaneous snap shot of the power system. The conventional system is not able to satisfy the time-synchronized requirement of power system. Phasor Measurement Unit (PMU) is enabler of time-synchronized measurement, it communicate the synchronized local information to remote station.

Integrated Wide Area Protection and Control for Power Grid Security

The traditional“three defense lines”for power systems are based on local information and static protection&control strategy,which are not suitable to modern large-scale power systems.In order to improve the security of UHV hybrid power grids,the Integrated Wide Area Protection&Control(IWAPC)is proposed in this paper by applying the new technologies of synchronized high-speed communication,which integrates“three defense lines”and promotes existing wide area protection only for security control.The IWAPC is the hierarchical protection and control system which provides the protection and control for wide area power networks to improve their reliability and security.It is divided into three levels,the local bay level,the substation integrated protection level and the wide area protection level.The wide area real-time protection and control information platform is the most important part of the IWAPC,which is based on a synchronized wide area communication network.The key technologies and new development trends include network topology analysis,wide area backup protection,wide area intelligent reclosing,wide area load shedding,wide area auto-switching,overload cutoff and transfer,transmission section protection,intelligent system splitting and dynamic stability control.It cannot only integrate three lines of defense for power system protection and control,but also improve security of the power grid.

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

Complexity of modern electrical power systems is steadily increasing.This 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 systems.From one hand,the power system response time is becoming shorter and at the same time the fault level is becoming smaller.This is significantly affecting requirements of control loops,as well as power system protection.

高速铁路智能牵引变电所技术研究

研究目的:高速铁路牵引供电系统智能化是高速铁路智能化的重要组成部分,而智能牵引变电所是牵引供电系统智能化的核心,又是牵引供电系统智能化发展的趋势。目前我国高速铁路牵引变电所智能化技术处于初步发展阶段,智能化技术水平不高,本文对牵引变电所一次设备智能化、广域保护、辅助监控等技术方案进行研究,为实现牵引变电所智能化提出系统方案。研究结论:(1)从六个方面总结了智能牵引变电所的技术特征,便于对智能牵引变电所更深刻的认识;(2)智能牵引变电所采用“三层两网”布局,结构更加简化和清晰;(3)一次设备的智能化方案,建议新建设备采用集成化一体设备,改造设备采用外挂分离式设备;(4)采用网络化的广域保护实现了牵引网故障区段的隔离和供电臂的自愈重组,实现所间智能化控制;(5)本文研究内容可为牵引变电所的智能化提供技术参考。

高速铁路牵引变电所智能化建设方案研究

智能牵引变电所是智能牵引供电系统的核心,由智能化一次系统、广域保护测控系统和智能辅助系统构成。为提高目前在建高铁牵引供电系统智能化水平,探讨并提出了针对其牵引变电所的智能化改造方案。

智能电网中的继电保护技术应用

阐述智能电网继电保护技术的应用,包括智能传感技术、广域保护技术、网络通信技术、数字化技术、自身重构技术的应用。分析可再生能源的并网技术和智能电网继电保护技术的优化措施。

基于WF-IoT融合物联网的控制技术在航站楼内的应用

航站楼作为机场建设中最重要的工程之一,承担着为出发、到达、经停、滞留机场的飞机乘客及接送机人员提供服务的功能。同时,航站楼作为城市乃至国家对外的重要窗口,其形象、功能也成为了机场建设中最重要的内容。基于WF-IoT融合物联网控制技术具有通信速度快、功耗低、使用成本低、安全性高的优势,同时具备“雾”计算能力,本文通过该技术在航站楼设计中的实际应用说明其相对传统智能照明控制系统、传统紫外线灯及航空障碍灯控制装置的诸多优点和优势。

龙溪口航电枢纽防护区运行安全智能管控系统研究

针对传统防护区运行安全管理以人工为主、信息利用低、动态评估预警缺失等问题,结合龙溪口航电枢纽防护区运行安全管理的主要问题和需求,以创新运行管理模式、强化信息互联共享、提升智能管控水平为目标,构建集数据在线辨识、涝情监控预测、安全实时诊断、风险动态评估、预警响应决策于一体的多层次系统结构,提出涝情实时监控、涝情风险评估、防洪堤安全分析与风险评估等核心功能模块的实现路径和技术要求。研究成果可为全面提升龙溪口航电枢纽防护区防灾减灾能力和安全保障水平提供技术支撑。

Hierarchical protection control system of smart substations

This paper analyzes the problems of the relay protections and secondary circuits of traditional substations,and introduces the hierarchical protection and control system of smart substations based on the technologies like IEC 61850 Standard,electronic instrument transformer,process level network,and wide area optical fiber communication network,etc.The hierarchical protection and control system includes three levels:local area protection,substation area protection and control,and wide area protection and control.These three levels are combined to solve the problems of the relay protections in traditional substations,thus improving protection performance and control capability of the system.

Developments of power system protection and control

Synchronized wide area communication has become a mature technology,which makes the real-time interaction between the substations and the wide area protection and control system possible.However,the present protection and control system to handle this real-time data has been recognized to be deficient.This paper begins by reviewing the development history of power system protection,with special attention paid to the recent development in the field of wide-area and integrated protections,in order to look into the future development of protection and control systems.Then the concept of integrated wide area protection and control is introduced,where it can be shown that a hierarchical protection and control system provides the protection and control for wide area or regional power substations/plants and their associated power networks.The system is mainly divided into three levels:the local,the substation/plant,and the wide area/regional.The integrated functions at each level are described in details with an aim to develop an optimal coordination mechanism between each level.The key element in the proposed system is the wide area real-time protection and control information platform,which not only enables the merger of three lines of defence for power system protection and control,but also provides a perfect tool for the application of cloud computing in substations and power networks.

智能电网中的继电保护技术应用

阐述继电保护技术中的单原件保护、广域保护、智能传感器特点,分析继电保护配置方案,包括线路保护、组件保护、综合监测系统的应用。

基于智能云模型的广域阻尼控制器设计

互联电力系统极易发生区间低频振荡,且系统精确数学模型难以获得。为此,提出了一种基于智能云模型的广域阻尼控制器的设计方法。从多规则二维云发生器出发,详细介绍了智能云模型广域阻尼控制器的设计方法。通过调整量化、比例因子,提高控制精度并获得普适性。仿真结果表明:方法的控制效果优于模糊控制,所设计的控制器能够有效抑制区间低频振荡,提高系统的稳定性,在多区域互联大电网中具有可行性。

智能电网中的继电保护技术分析

阐述智能电网的特点,智能电网环境下继电保护技术,包括单原件保护技术、广域保护技术、超高压交直流电混输技术、智能传感技术、自身重构技术。

智能牵引供电系统网络化广域保护通信通道

以数字化、智能化为特征的智能高铁,系统内各要素之间信息充分流通,实现信息空间和物理空间内数据实时共享、交互。数据信息的流通离不开通信技术的支撑和通信通道的建设。智能牵引供电系统是智能高铁的重要组成部分,文章以供电系统中的广域保护测控系统对通信通道的需求为出发点,分析其技术要求和组网方案,并结合现场实例说明了通信通道的重要性。

配电网继电保护的创新路径研究

继电保护作为配电网的重要组成部分,不仅可以促进配电网的稳定运行,还有助于减少突发事件对配电网所产生的影响。但随着配电网建设规模的逐渐扩大,传统的继电保护已无法满足需求。文章基于配电网继电保护的概念和原理,分析了配电网继电保护创新的必要性,并提出了具体的创新措施,以期保障电力系统的安全稳定运行,助力于我国电力行业的进一步发展。

城市天然气智慧管控平台建设与运行管理

进入21世纪,随着IT技术、网络技术、管理技术的发展,生产型企业的管理层逐渐意识到“管理出效益”的重要性,早期一个生产企业一般就有一两个信息化系统,类似SCADA系统、视频监控系统、OA系统等。管理层在原先“只监不管”基础上,逐渐投资建设相关信息化系统,如GIS系统、巡检系统、综合调度系统、智慧燃气等,结合相关的管理措施,使得企业的生产效益得到了有力的提升。

智能配电网广域测控系统及其保护控制应用技术

分布式电源的大量接入以及对供电质量、运行效率要求的提高,使得配电网的保护控制面临新的挑战。传统的基于集中与就地控制方式的保护控制技术,分别存在响应速度慢与利用信息有限、功能不完善的问题。文中提出建立基于对等通信网络的广域测控系统,同时支持基于主站的集中控制和在智能终端上实现的就地与分布式智能控制方式,为配电网监测与保护控制应用提供开放式的统一支撑平台,在此基础上实现了分布式电源并网控制、广域保护、快速故障隔离和恢复供电、小电流接地故障自愈等新型保护控制技术。随着研究的深入与技术的不断完善,将形成完整的广域测控系统及其保护控制应用技术体系,为智能配电网建设提供可靠的二次技术支撑。

关于电力系统广域保护的评述

为有利于电力系统停电防御体系的进一步发展,讨论电力系统的广域保护,包括广域设备保护和广域系统保护的功能、控制方式及系统结构;回顾其信息采集、知识提取和控制决策方面的进展。从理论和应用相结合的观点剖析广域后备保护的可行性、困难和发展方向;指出需要在算法与受扰轨迹的知识提取上取得重大突破,并与数值仿真相结合,才能真正发挥相量测量单元在广域保护中的作用;强调按风险观点将广域保护与预防控制及传统保护协调的重要性。

广域测量技术在电力系统中的应用研究进展

大规模交直流混合电网的建设和发展,对电力系统稳定和控制在空间广度和时间维度上提出了更高的要求。广域测量系统(Wide Area Measurement System,WAMS)的同步量测数据在空间和时间上满足上述要求,因而研究WAMS技术在电力系统中的应用十分必要。从WAMS的结构和原理出发,总结了近五年来广域测量系统在电力系统动态监测与故障分析、辨识与估计、系统稳定控制和广域保护等方面的研究进展,并详细分析了其中存在的问题。最后展望了广域测量技术需要进一步研究的问题,指出基于WAMS技术构建大规模互联电力系统的广域安全监测及控制系统是一个很有意义的研究方向。