CN108429341A - 一种基于对时系统的谐波在线监测终端准同步启动与同步数据获取方法 - Google Patents

一种基于对时系统的谐波在线监测终端准同步启动与同步数据获取方法 Download PDF

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CN108429341A
CN108429341A CN201810181243.8A CN201810181243A CN108429341A CN 108429341 A CN108429341 A CN 108429341A CN 201810181243 A CN201810181243 A CN 201810181243A CN 108429341 A CN108429341 A CN 108429341A
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harmonic wave
startup
line monitoring
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CN108429341B (zh
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仉志华
曲泽奇
田咏桃
张吉文
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China University of Petroleum East China
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00019—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using optical means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

本发明专利公开了一种基于对时系统的谐波在线监测终端准同步启动与同步数据获取方法。谐波在线监测系统中，终端相邻关联关系依靠主站设定。采用相邻谐波在线监测终端点对点通信技术，满足启动条件的谐波在线监测终端主动向相邻终端发送脉冲启动信号，实现无法依靠监测信号启动的相邻终端的准同步启动。启动后的谐波在线监测终端向主站同时发送监测数据与对应的绝对时刻，利用主站得到的监测数据与绝对时刻获取同一时间断面下的数据，解决了现有谐波在线监测终端在某些情况下不能同时启动而无法获取同一时间断面信息的问题。

Description

一种基于对时系统的谐波在线监测终端准同步启动与同步数 据获取方法
技术领域
本发明涉及配电网电能质量领域，特别涉及配电网谐波在线监测同步数据获取方法。
背景技术
随着配电网中变频器等电力电子设备不断增加，谐波污染日趋严重，谐波干扰造成电容器损坏、继电保护装置误动作等问题。谐波在线监测系统可以集成配电网谐波监测数据，能够分析、诊断、预测和评估谐波对配电网运行的影响，及时发现影响配电网安全的隐患，支撑谐波治理决策，增强配电网系统运行可靠性和稳定性。
通常情况下变电站母线和重要用户进线处会安装有谐波在线监测终端，线路中间的终端较少。谐波在线监测终端的启动条件有谐波量超标、谐波变化量超过阈值，或者根据断路器的开关动作信号启动。谐波在线监测终端具有录波功能，一般可以缓存10个周波的数据，且数据实时刷新。有些谐波在线监测系统具有对时功能，通过GPS等方式实现终端的时间校准。在系统正常运行时，各谐波在线监测终端每隔一定时间通过光纤以太网将数据及对应的绝对时间打包送到主站。当系统当中出现扰动后，谐波超标的节点监测终端会自动启动并将监测数据与对时系统提供的绝对时间一并上传至主站，而未启动的终端依然按照设定的时间间隔监测并上传数据。由于多个谐波源产生的谐波在不同节点处叠加后可能会存在相互削弱的情况，导致扰动情况下某些监测终端可能无法达到启动条件，从而不能获取扰动源附近的所有终端监测的数据。而在分析谐波传变机理与叠加规律时，需要利用所有监测终端在同一时间断面下的监测数据，因此现有的监测系统无法满足上述分析条件，必须解决各终端发往主站数据不同步的问题。
发明内容
本发明解决的技术问题是：谐波在线监测系统中，终端相邻关联关系依靠主站设定。采用相邻谐波在线监测终端点对点通信技术，满足终端启动条件的终端主动向相邻终端发送脉冲启动信号，实现相邻终端的准同步启动。通过主站获得的监测数据及其对应的绝对时间，得到各谐波在线监测终端在同一时间断面下所记录的谐波监测数据，便于分析谐波传变规律。
要求终端具备以下三个功能：
功能1：谐波在线监测系统中，终端相邻关联关系依靠主站设定。当任意一个终端满足启动条件时，该终端会通过点对点通信方式向相邻终端发送脉冲启动信号；依靠监测数据变化而自身启动的终端将不再接收相邻终端发来的脉冲启动信号。但由于脉冲启动信号传输过程中存在通信延时，到达相邻终端的绝对时间存在差异，但一般延时不会超过20ms。
功能2：各终端可通过对时系统(如GPS,北斗)实现时间校对，误差在几us以内。
功能3：终端向主站同时发送监测数据与对应的绝对时间。当第一个终端启动时，会将此时采集的数据和时间信息发送到主站，并向相邻终端发送脉冲信号，其他终端接收到脉冲启动信号后启动，并将各终端启动时前10个周波及启动后20个周波所采集的数据及时间信息打包发送到主站。由于每个终端发送到主站的数据都含有绝对时间，因此可以将所有终端发送至主站的数据进行时间校准，找到第一个终端启动时刻下所有终端发送的数据，从而分析同一时间断面下的各个测量点的谐波信息。
与现有技术相比本发明的有益效果是：
本发明专利所公开的谐波在线监测终端准同步启动方法，可以得到同一时间断面下所有终端采集的谐波监测数据，解决了传统谐波在线监测系统无法得到同一时间断面下各终端所采集的谐波监测数据的问题
附图说明
附图1为谐波在线监测系统图，PQD1、PQD2、PQD3为谐波监测终端，各谐波在线监测终端之间、各谐波在线监测终端与主站之间均通过光纤以太网通信。
附图2为PQD1监测电流波形图，尖端脉冲为PQD1所发出的脉冲启动信号。
附图3为PQD2监测电流波形图，尖端脉冲为PQD2收到的PQD1所发出的脉冲启动信号。
附图4为PQD3监测电流波形图，尖端脉冲为PQD2收到的PQD1所发出的脉冲启动信号。
具体实施方式
如附图1所示，馈线分支点P处支路存在一谐波源，3s时谐波产生量发生变化，由于系统阻抗较小，故PQD1处谐波变化量明显，满足启动条件，而PQD2、PQD3处谐波变化量较小，不满足启动条件。PQD1启动时，通过光纤以太网向PQD2和PQD3发送脉冲启动信号，如附图2所示；PQD2和PQD3收到脉冲启动信号后启动，如附图3、4所示。各终端启动后通过光纤以太网向主站发送启动前缓存的10个周波和启动后20个周波的数据及其对应的绝对时间。以第一个启动的谐波在线监测终端启动时所对应的绝对时间作为参考，获取其他终端此时刻下所采集的数据，从而得到同一时间断面下的谐波监测数据。

Claims (4)

1.一种基于对时系统的谐波在线监测终端准同步启动与同步数据获取方法，其特征在于，各终端可以实现准同步启动，并能获取同一时间断面下各终端采集的谐波信息。
2.根据权利要求1所述的一种基于对时系统的谐波在线监测终端准同步启动与同步数据获取方法，其特征在于，终端之间的相邻关联关系通过主站预先设定。
3.根据权利要求1，要求2所述的一种基于对时系统的谐波在线监测终端准同步启动与同步数据获取方法，其特征在于，谐波在线监测终端具有对时功能；满足启动条件的谐波在线监测终端启动后，会将监测数据与绝对时间一并送往主站，同时利用光纤以太网向相邻终端发送脉冲启动信号；满足谐波在线监测终端启动条件而主动启动的终端不再接收相邻终端发来的启动脉冲信号。
4.根据权利要求3所述的一种基于对时系统的谐波在线监测终端准同步启动与同步数据获取方法，其特征在于，通过主站获得的谐波监测数据，利用第一个启动的谐波在线监测终端对应的启动时刻为参考，找到所有终端此时刻发送的数据，从而获取同一时间断面下的各个测量点的谐波信息。
CN201810181243.8A 2018-03-06 2018-03-06 一种基于对时系统的谐波在线监测终端准同步启动与同步数据获取方法 Active CN108429341B (zh)

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CN110927425A (zh) * 2018-09-20 2020-03-27 中国石油化工股份有限公司 一种基于谐波电流监测的配电网的谐波源区段定位方法

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