CN102539981A - Wide area protection fault recording method for electric power system - Google Patents
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Abstract
The invention discloses a wide area protection fault recording method. Merging units and intelligent control units are used as network message data sources. According to fault recording processing, a plurality of networking input/output processing modules of a wide area intelligent control host of an electric power system are used as processing units for network massage data, and decode IEC61850-9-2 messages sent by different merging units and GOOSE messages sent by the intelligent control units to obtain sampling points and switching value information based on SmpCnt synchronization method, and send the sampling points and switching value information to a communication processing module, and fault recording files in a COMTRADE format are formed. The merging units and the intelligent control units are connected to a port of a process layer exchanger through fiber ports; and the process layer exchanger is connected to fiber ports of the input/output processing modules of the wide area intelligent control host. Distributed processing is adopted, the fault recording files are accurately and truly formed, and the method has high universality and expansibility, and can adapt to power grids with different network structures.
Description
Technical field
The invention belongs to relay protection monitoring field in the electric system, particularly electrical power system wide-area protection failure wave-recording method.
Background technology
The thought of traditional three lines of defence is the significant contribution of China work about electric power person to power technology, has guaranteed the weak electrical network long-term safety stable operation of China's relative thin.Why adopt relatively independent defence line, three roads to guarantee its safe and stable operation to a unified large-scale power grid like this, communicated by letter and the restriction of level of hardware.On the one hand, the traditional electrical network control system has adopted dispersion, relatively independent control model, on control performance, has received certain influence, need remedy with complicated more protection and control principle for this reason; On the other hand, because the overwhelming majority adopts the Sampling techniques of traditional analog amount, the analog quantity that each protective device collects can not realize sharing; Preposition result of calculation can not be shared; Caused devices such as every cover relay protection, step-out off-the-line, stable control must adopt independently hardware system, caused overlapping investment, the operation maintenance workload increases considerably; Also lack message exchange more closely between the relatively independent defence line, tradition three roads, weakened Collaborative Control ability whole electrical network.
Along with the construction of more and more digital transformer substations, the develop rapidly of the communication technology, and the applying of power optical fiber communication network, possessed and built material conditions based on the wide area intelligence control system of real-time Wide-area Measurement Information.To the wide area protection failure wave-recording, main following points difference: 1. compare the traditional protection failure wave-recording, what the wide area protection failure wave-recording was handled is the network message data; 2. what the wide area protection failure wave-recording was handled is multi-compartment, large-scale data, and process chip is had high requirements.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of wide area protection failure wave-recording method is provided, obtain to meet the failure wave-recording file of COMTRADE form, can protect failure wave-recordings, and record ripple result is accurately reliable adaptable across different The Wide Area Power.
The present invention realizes through following technical scheme:
A kind of wide area protection failure wave-recording method; Comprise and use merge cells, intelligent control unit to be the network message data source; It is that a plurality of network input and output processing modules through electrical network wide area Based Intelligent Control main frame are as the processing unit of network message data that failure wave-recording is handled; The GOOSE message that IEC61850-9-2 message that respectively different merge cellses is sent and intelligent control unit send is decoded, and forms sampled point and switching value information based on the SmpCnt method for synchronous, redispatches to Communications Processor Module; Formation meets the failure wave-recording file of COMTRADE form, it is characterized in that: may further comprise the steps:
⑴. merge cells, intelligent control unit are connected to process layer switch port through optical fiber port respectively;
⑵. the process layer switch is connected to the fiber port of a plurality of input and output processing modules of wide area Based Intelligent Control main frame through multimode optical fiber;
⑶. a plurality of input and output processing modules are decoded to the IEC61850-9-2 message, the GOOSE message that receive respectively;
(4). the calculating that resamples respectively of a plurality of input and output processing modules forms sampled point and switching value based on the SmpCnt synchronization principles; Concrete grammar is following: a plurality of input and output processing modules are according to unified reference time, and every separated 0.833ms obtains corresponding simulating amount and switching value; For analog quantity, at first obtain the data member SmpCnt in the IEC61850-9-2 message, SmpCnt circulates between 0 to 3999, and every separated 0.25ms increases progressively once; Find out from unified reference time nearest 1 SmpCnt or 2 SmpCnt, if be 0 reference time, so corresponding nearest SmpCnt is 0, if be 0.833ms reference time, so corresponding nearest SmpCnt is 3 and 4; Once more; If the corresponding time of SmpCnt equated with reference time; Obtain analog value in that frame message so, if between two SmpCnt, obtain the analog value in the two frame messages reference time so respectively; And linear interpolation goes out corresponding simulating value reference time, and a plurality of like this input/output modules just can obtain the analog value based on reference time.For switching value, get from nearest GOOSE message reference time, obtain the corresponding switch amount;
⑸. a plurality of input and output processing modules send to Communications Processor Module through inner gigabit switch with analog quantity and switching value;
⑹ unified comprehensive each interval sampling point of Communications Processor Module and switching value form the failure wave-recording file that meets the COMTRADE form.Judge whether the message of IEC-61850-9-2 agreement; Then decoding in this way, as otherwise whether get into the message of GOOSE agreement; The decoding back resamples and calculates, and forms the sampling point information based on SMPCNT, sends to communication module and forms the failure wave-recording file that meets the COMTRADE form.
The message of GOOSE agreement in this way; The decoding back forms switching value information, sends to communication module and forms the failure wave-recording file that meets the COMTRADE form.
COMTRADE is the ieee standard electrical power system transient data interchange general format.Standard is a kind of form of the document definition of the transient state waveform that collects of electric system or electric power system model and casualty data.
The present invention uses merge cells, intelligent control unit; A plurality of network input and output processing modules through electrical network wide area Based Intelligent Control main frame; The GOOSE message that IEC61850-9-2 message that respectively the different interval merge cells is sent and intelligent control unit send is decoded; Formation is based on the sampled point and the switching value information of SmpCnt synchronization principles, again through sending to Communications Processor Module, the final failure wave-recording file that meets the COMTRADE form that forms unification.Failure wave-recording method of the present invention based on SmpCnt synchronization principles, employing distributed treatment, can form the failure wave-recording file accurately, truly; And this Wave record method versatility, extendability are strong, can adapt to the electrical network of heterogeneous networks structure.
Advantage of the present invention and beneficial effect are: wide area protection failure wave-recording method adopts distributed treatment, a plurality of module cooperative work, the record ripple file that meets the COMTRADE form of formation based on the SmpCnt synchronization principles.Can greatly reduce each CPU and handle load, improve the overall load processing power of system, owing to adopt distributed treatment, improve the adaptive faculty to heterogeneous networks structure electrical network simultaneously, extensibility is strong.
Description of drawings
Fig. 1 is the employed system architecture synoptic diagram of wide area Wave record method of the present invention;
Fig. 2 is the process flow diagram of wide area Wave record method among the present invention.
Embodiment
Through specific embodiment the present invention is made further detailed description below, following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
A kind of wide area protection failure wave-recording method comprises and uses merge cells, intelligent control unit to be the experiment source, forms the step of the failure wave-recording file that meets the COMTRADE form.
The innovation part of this Wave record method is further comprising the steps of:
⑴. merge cells, intelligent control unit are connected to process layer switch port through optical fiber port respectively;
⑵. the process layer switch is connected to the fiber port of a plurality of input and output processing modules of wide area Based Intelligent Control main frame through multimode optical fiber;
⑶. a plurality of input and output processing modules are decoded to the IEC-61850-9-2 message, the GOOSE message that receive respectively;
(4). a plurality of input and output processing modules are according to unified reference time, and every separated 0.833ms obtains corresponding simulating amount and switching value.For analog quantity, at first obtain the data member SmpCnt in the IEC61850-9-2 message, SmpCnt circulates between 0 to 3999, and every separated 0.25ms increases progressively once; Find out from unified reference time nearest 1 SmpCnt or 2 SmpCnt, if be 0 reference time, so corresponding nearest SmpCnt is 0, if be 0.833ms reference time, so corresponding nearest SmpCnt is 3 and 4; Once more; If the corresponding time of SmpCnt equated with reference time; Obtain analog value in that frame message so, if between two SmpCnt, obtain the analog value in the two frame messages reference time so respectively; And linear interpolation goes out corresponding simulating value reference time, and a plurality of like this input/output modules just can obtain the analog value based on reference time.For switching value, get from nearest GOOSE message reference time, obtain the corresponding switch amount.
⑸. a plurality of input and output processing modules send to Communications Processor Module through inner gigabit switch with sampled point and switching value;
⑹. Communications Processor Module unified comprehensive each analog quantity and switching value at interval, these analog quantitys and switching value be according to reference time, each other sequence interval 0.833ms.At first form cfg file, this document comprises each analog quantity, switching value is described explanation, record wave point number, separation, formation time etc.; Form the DAT file once more, this document specifically comprises analog value and the switch value of each reference time; Form the HDR file at last, this document comprises general informations such as manufacturer, so just forms the failure wave-recording file that meets the COMTRADE form.Cfg file only is a kind of file type of preserving user's setting.The DAT file can be exactly the meaning of DATA, i.e. data file according to extension name; The HDR file is meant the HDR file.
Claims (3)
1. wide area protection failure wave-recording method; It is characterized in that: comprise and use merge cells, intelligent control unit to be the network message data source; It is that a plurality of network input and output processing modules through electrical network wide area Based Intelligent Control main frame are as the processing unit of network message data that failure wave-recording is handled; The GOOSE message that IEC61850-9-2 message that respectively different merge cellses is sent and intelligent control unit send is decoded, and forms sampled point and switching value information based on the SmpCnt method for synchronous, redispatches to Communications Processor Module; Formation meets the failure wave-recording file of COMTRADE form, may further comprise the steps:
⑴. merge cells, intelligent control unit are connected to process layer switch port through optical fiber port respectively;
⑵. the process layer switch is connected to the fiber port of a plurality of input and output processing modules of wide area Based Intelligent Control main frame through multimode optical fiber;
⑶. a plurality of input and output processing modules are decoded to the IEC61850-9-2 message, the GOOSE message that receive respectively;
(4) a plurality of input and output processing modules calculating that resamples respectively forms sampled point and switching value based on the SmpCnt synchronization principles;
⑸ many input and output processing modules send to Communications Processor Module through inner gigabit switch with analog quantity and switching value;
⑹ unified comprehensive each interval sampling point of Communications Processor Module and switching value form the failure wave-recording file that meets the COMTRADE form;
Judge whether the message of IEC-61850-9-2 agreement; Then decoding in this way, as otherwise whether get into the message of GOOSE agreement; The decoding back resamples and calculates, and forms the sampling point information based on SMPCNT, sends to communication module and forms the failure wave-recording file that meets the COMTRADE form;
The message of GOOSE agreement in this way; The decoding back forms switching value information, sends to communication module and forms the failure wave-recording file that meets the COMTRADE form.
2. wide area protection failure wave-recording method according to claim 1 is characterized in that: the concrete grammar of step (4) is that a plurality of input and output processing modules are whenever obtained corresponding simulating amount and switching value at a distance from 0.833ms according to unified reference time; For analog quantity, at first obtain the data member SmpCnt in the IEC61850-9-2 message, SmpCnt circulates between 0 to 3999, and every separated 0.25ms increases progressively once; Find out from unified reference time nearest 1 SmpCnt or 2 SmpCnt, if be 0 reference time, so corresponding nearest SmpCnt is 0, if be 0.833ms reference time, so corresponding nearest SmpCnt is 3 and 4; Once more; If the corresponding time of SmpCnt equated with reference time; Obtain analog value in that frame message so, if between two SmpCnt, obtain the analog value in the two frame messages reference time so respectively; And linear interpolation goes out corresponding simulating value reference time, and a plurality of like this input/output modules just can obtain the analog value based on reference time;
For switching value, get from nearest GOOSE message reference time, obtain the corresponding switch amount.
3. wide area protection failure wave-recording method according to claim 1; It is characterized in that: (concrete grammar of ⑹ is step; Communications Processor Module unified comprehensive each analog quantity and switching value at interval, these analog quantitys and switching value be according to reference time, each other sequence interval 0.833ms; At first form cfg file, this document comprises each analog quantity, switching value is described explanation, record wave point number, separation and formation time; Form the DAT file once more, this document specifically comprises analog value and the switch value of each reference time; Form the HDR file at last, this document comprises general informations such as manufacturer, so just forms the failure wave-recording file that meets the COMTRADE form.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236916A (en) * | 2013-05-09 | 2013-08-07 | 北京四方继保自动化股份有限公司 | Dynamic compensation method for access network delay in SV (Sampled Value) networking of digitalized relay protection device |
| CN103389421A (en) * | 2013-06-26 | 2013-11-13 | 国家电网公司 | Island detection method and device based on GOOSE communication |
| CN103905177A (en) * | 2014-03-21 | 2014-07-02 | 许继电气股份有限公司 | Sampling value transmission system and transmission method applied to wide-area protection |
| CN104036070A (en) * | 2014-05-19 | 2014-09-10 | 国家电网公司 | Digitized recording playback method |
| CN104078944A (en) * | 2014-06-20 | 2014-10-01 | 国家电网公司 | GOOSE message/switching value conversion method for digitized relay protection transformation |
| CN104867060A (en) * | 2015-05-29 | 2015-08-26 | 国电南瑞科技股份有限公司 | Non-interpolation wave recording method adaptive to point-to-point mode in intelligent substation |
| CN105116246A (en) * | 2015-07-27 | 2015-12-02 | 云南电力调度控制中心 | Power grid operation protection real-time online analysis method |
| CN107453405A (en) * | 2017-08-14 | 2017-12-08 | 光科技股份有限公司 | A kind of Fault Locating Method and system based on transient state recording fault detector |
| CN110320448A (en) * | 2019-08-05 | 2019-10-11 | 国家电网有限公司 | A kind of distribution feeder fault wave recording device |
| CN110346668A (en) * | 2019-08-06 | 2019-10-18 | 武汉中元华电软件有限公司 | Detection wave recording device and data monitoring method in a kind of electric system |
| CN110830140A (en) * | 2019-11-20 | 2020-02-21 | 国网山西省电力公司长治供电公司 | Distributed wave recording device and data synchronization method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101183132A (en) * | 2007-09-21 | 2008-05-21 | 江苏金智科技股份有限公司 | Wave record method supporting electrical power system transient data interchange general format |
| CN101498757A (en) * | 2009-03-06 | 2009-08-05 | 深圳市双合电脑系统股份有限公司 | Real-time dynamic monitoring and recording equipment of power system |
| CN101515015A (en) * | 2009-03-06 | 2009-08-26 | 深圳市双合电脑系统股份有限公司 | Power quality monitoring and recording device of power system |
-
2012
- 2012-02-17 CN CN 201210035742 patent/CN102539981B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101183132A (en) * | 2007-09-21 | 2008-05-21 | 江苏金智科技股份有限公司 | Wave record method supporting electrical power system transient data interchange general format |
| CN101498757A (en) * | 2009-03-06 | 2009-08-05 | 深圳市双合电脑系统股份有限公司 | Real-time dynamic monitoring and recording equipment of power system |
| CN101515015A (en) * | 2009-03-06 | 2009-08-26 | 深圳市双合电脑系统股份有限公司 | Power quality monitoring and recording device of power system |
Non-Patent Citations (1)
| Title |
|---|
| 骆健等: "一种新型故障录波系统的实现", 《电网技术》 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236916A (en) * | 2013-05-09 | 2013-08-07 | 北京四方继保自动化股份有限公司 | Dynamic compensation method for access network delay in SV (Sampled Value) networking of digitalized relay protection device |
| CN103236916B (en) * | 2013-05-09 | 2016-01-20 | 北京四方继保自动化股份有限公司 | Digital relay protection device SV networking access network time delay dynamic compensation method |
| CN103389421A (en) * | 2013-06-26 | 2013-11-13 | 国家电网公司 | Island detection method and device based on GOOSE communication |
| CN103905177B (en) * | 2014-03-21 | 2017-12-12 | 许继电气股份有限公司 | A kind of sampled value Transmission system and transmission method applied to wide area protection |
| CN103905177A (en) * | 2014-03-21 | 2014-07-02 | 许继电气股份有限公司 | Sampling value transmission system and transmission method applied to wide-area protection |
| CN104036070A (en) * | 2014-05-19 | 2014-09-10 | 国家电网公司 | Digitized recording playback method |
| CN104036070B (en) * | 2014-05-19 | 2017-06-13 | 国家电网公司 | One kind record ripple digitlization back method |
| CN104078944A (en) * | 2014-06-20 | 2014-10-01 | 国家电网公司 | GOOSE message/switching value conversion method for digitized relay protection transformation |
| CN104867060A (en) * | 2015-05-29 | 2015-08-26 | 国电南瑞科技股份有限公司 | Non-interpolation wave recording method adaptive to point-to-point mode in intelligent substation |
| CN105116246A (en) * | 2015-07-27 | 2015-12-02 | 云南电力调度控制中心 | Power grid operation protection real-time online analysis method |
| CN107453405A (en) * | 2017-08-14 | 2017-12-08 | 光科技股份有限公司 | A kind of Fault Locating Method and system based on transient state recording fault detector |
| CN110320448A (en) * | 2019-08-05 | 2019-10-11 | 国家电网有限公司 | A kind of distribution feeder fault wave recording device |
| CN110346668A (en) * | 2019-08-06 | 2019-10-18 | 武汉中元华电软件有限公司 | Detection wave recording device and data monitoring method in a kind of electric system |
| CN110830140A (en) * | 2019-11-20 | 2020-02-21 | 国网山西省电力公司长治供电公司 | Distributed wave recording device and data synchronization method thereof |
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