IEC61850数字化变电站通信仿真研究
摘要
电子式互感器、智能开关等智能化一次设备逐步应用于实际工程,同时IEC 61850标准为数字化变电站提供了全面的通信规范,使得建设数字化变电站的实践成为可能。与常规变电站相比,数字化变电站的通信网络结构和信息传输方式发生了巨大变化,因此有必要对数字化变电站通信网络的动态性能进行研究。电力通信同步仿真软件EPOCHS(Electric Powerand Communication Synchronizing Simulator)为数字化变电站通信网络的仿真研究提供了一种有效工具。
本文阐述了IEC 61850标准研究现状,对IEC 61850数字化变电站的主要特点以及变电站通信网络的仿真研究进行了概述。根据变电站通信网络的性能要求,研究了基于IEC 61850的数字化变电站通信网络的组网方案。深入研究了变电站以太网通信时延的构成及其影响因素,给出了提高网络性能的实时改进措施。阐述了在EPOCHS平台实现IEC61850标准主要报文传输的仿真过程。为了实现数字化变电站通信仿真,对EPOCHS平台进行以下扩展:改造NS2中单物理子网结构,实现了交换机级联,将只能在单个交换机上设置的VLAN多播协议扩展到整个变电站通信网络;在交换机和通信端节点添加基于IEEE802.1Q的缓冲队列,实现了报文按优先级传输。
在扩展后的EPOCHS平台建立了数字化变电站通信模型,针对全站统一式网络结构,进行通信仿真实验,仿真采样值(SV)报文和通用变电站事件(GOOSE)报文在各种不同条件下的报文传输时延和时延抖动,并对影响变电站通信网络实时性因素作了定量分析。
Smart equipments such as ECT/EVT, intelligent switchgear and etc. are gradually applied in practical project. The standard of substation communication network and system IEC61850 provides complete criterion for communication of digital substations. All above makes it possible for the construction of digital substation. Comparing with conventional substation, great change has occurred in both aspects of network framework and message transmission mode in digital substation automation system. So the dynamic performance of communication network in digital substation is necessary to be studied. Electric Power and Communication Synchronizing Simulator (EPOCHS) is an effective tool for simulation study on IEC 61850 substation communication network.
The research status of IEC61850 standard is described in this paper. The main characteristics of IEC61850 digital substation and the communication simulation study of substation are summarized. According to the substation communication networks performance requirements, the network building schemes in digital substation based on the IEC 61850 standard are discussed. The messages transmission delay in substation Ethernet and its influencing factors are adequately researched, and methods which can improve the real-time performance are presented. The simulation process of IEC61850 main packet transmission is explained based on EPOCHS. For the communication simulation of IEC61850 digital substation, EPOCHS platform is extended as follows: The single physical subnet structure is changed and linkage among physical subnets is implemented in Network Simulator version 2 (NS2); Virtual LAN multicast protocol which is set originally in single switch is extended to substation communication network. IEEE 802.1Q buffer queue with multi-priority based on the end_node and switch is designed , and the message transmitted with priority tag is realized.
The communication model of digital substation is set up on the extended EPOCHS platform . The experiment is carried out for internal unique network framework. Message delay and delay jitter are compared under different conditions. The factors affecting communication network real-time transmission are quantitatively analyzed based on simulation experiment result.
本文阐述了IEC 61850标准研究现状,对IEC 61850数字化变电站的主要特点以及变电站通信网络的仿真研究进行了概述。根据变电站通信网络的性能要求,研究了基于IEC 61850的数字化变电站通信网络的组网方案。深入研究了变电站以太网通信时延的构成及其影响因素,给出了提高网络性能的实时改进措施。阐述了在EPOCHS平台实现IEC61850标准主要报文传输的仿真过程。为了实现数字化变电站通信仿真,对EPOCHS平台进行以下扩展:改造NS2中单物理子网结构,实现了交换机级联,将只能在单个交换机上设置的VLAN多播协议扩展到整个变电站通信网络;在交换机和通信端节点添加基于IEEE802.1Q的缓冲队列,实现了报文按优先级传输。
在扩展后的EPOCHS平台建立了数字化变电站通信模型,针对全站统一式网络结构,进行通信仿真实验,仿真采样值(SV)报文和通用变电站事件(GOOSE)报文在各种不同条件下的报文传输时延和时延抖动,并对影响变电站通信网络实时性因素作了定量分析。
Smart equipments such as ECT/EVT, intelligent switchgear and etc. are gradually applied in practical project. The standard of substation communication network and system IEC61850 provides complete criterion for communication of digital substations. All above makes it possible for the construction of digital substation. Comparing with conventional substation, great change has occurred in both aspects of network framework and message transmission mode in digital substation automation system. So the dynamic performance of communication network in digital substation is necessary to be studied. Electric Power and Communication Synchronizing Simulator (EPOCHS) is an effective tool for simulation study on IEC 61850 substation communication network.
The research status of IEC61850 standard is described in this paper. The main characteristics of IEC61850 digital substation and the communication simulation study of substation are summarized. According to the substation communication networks performance requirements, the network building schemes in digital substation based on the IEC 61850 standard are discussed. The messages transmission delay in substation Ethernet and its influencing factors are adequately researched, and methods which can improve the real-time performance are presented. The simulation process of IEC61850 main packet transmission is explained based on EPOCHS. For the communication simulation of IEC61850 digital substation, EPOCHS platform is extended as follows: The single physical subnet structure is changed and linkage among physical subnets is implemented in Network Simulator version 2 (NS2); Virtual LAN multicast protocol which is set originally in single switch is extended to substation communication network. IEEE 802.1Q buffer queue with multi-priority based on the end_node and switch is designed , and the message transmitted with priority tag is realized.
The communication model of digital substation is set up on the extended EPOCHS platform . The experiment is carried out for internal unique network framework. Message delay and delay jitter are compared under different conditions. The factors affecting communication network real-time transmission are quantitatively analyzed based on simulation experiment result.
引文
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