CN102411085B - Alternating current collecting and merging device and alternating current collecting method - Google Patents
Alternating current collecting and merging device and alternating current collecting method Download PDFInfo
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Abstract
The invention relates to an alternating current collecting and merging device which can exclude wrong sampled values in a self-adaptive manner and an alternating current collecting method and belongs to the technical field of power systems. The device comprises an alternating current collecting module, a data managing module, a data sending module and a time synchronization module, wherein an analog-digital transformation module is used for receiving original analog signals and outputting digital collected signals to the data managing module, the data managing module is used for receiving a secondary sampling pulse sequence output by the time synchronization module and outputting data in the standard format to the data sending module, and the data sending module is used for sending the data to a process level Ethernet network. By adopting the device and the method, distortion in ground sampling can be simply and effectively prevented, the application of a spacer layer device can be prevented from being affected, and the spacer layer device can be conveniently applied to the alternating current collecting and merging device.
Description
Technical field
What the present invention relates to is a kind of sampling apparatus and method of technical field of power systems, and specifically a kind of interchange collection with self-adaptation debug sampled value merges device and acquisition method thereof.
Background technology
Automatic system of intelligent transformer station requires merge cells (Merging Unit) to send sampling value message with the IEC61850-9-2 Standards Code.The protection and measurement and control of transformer station uniformly-spaced the work of bed device all based on this sampled value.So the sampled value correctness of sending on the merge cells is vital for the correct work of these devices.
But the value that guarantees each sampled point correctly is to be difficult to realize.Because equipment is received interference or other special circumstances of site environment, certain any value unavoidably can appear very large in the sampled value; This all can be proven in countless on-the-spot logouts and laboratory interference test.Effectively filtering is this puts large tens times, the point of hundreds of times than other neighbouring samples for commonly used Fu Shi filtering in protecting electrical power system and the observing and controlling algorithm.At this moment tend to cause the protective device malfunction.
Existing technology mainly by the applying portion such as protection and measurement and control by delay confirmation or set fixedly the method such as threshold and solve the problem that sampled value is made mistakes, the method for each manufacturer, different device employing all is not quite similar.This is because existing protection and measurement and control device itself has the of ac collecting part, rather than obtains the sampled value that merge cells has been put in order from Ethernet, and they can carry out subsequent treatment according to the characteristics that may make mistakes of its collecting part.And in digitized Intelligent Substation System, merge cells has been an independent device; If the sampled value of sending has relatively large deviation, just can not satisfy the requirement of various novel digital protections, measure and control device.
Find through the retrieval to prior art; Zhu Lin, Duan Xianzhong, Su Sheng, Li Yinhong have delivered document " based on the digital substation relay protection fault-tolerance approach of evidence theory " in " electrotechnics journal " first phase in 2011; the document proposes a kind of method of the multi-source mutual inductor being analyzed identification; identifying fault mistake sampled data prevents the protective relaying device malfunction.But this technology algorithm is complicated, and needs multi-source data, and could realize at wall.These have all limited the practical application of the method.
Summary of the invention
The present invention is directed to the prior art above shortcomings, provide a kind of interchange collection to merge device and acquisition method thereof, simply effectively prevent the ground sampling distortion, guarantee that the application of cell device is unaffected, can conveniently be applied to exchange collection and merge in the device.
The present invention is achieved by the following technical solutions:
The present invention relates to a kind of interchange collection and merge device, comprise: exchange acquisition module, data preparation module, data transmission blocks and to the time module, wherein: exchange acquisition module and receive original analog and export the digital collection signal to the data preparation module, the data preparation module receive to the time double sampling pulse train of module output and outputting standard formatted data to data transmission blocks, data transmission blocks sends to the process layer Ethernet with these data.
Described interchange acquisition module is changed to digital signal with the original analog of input, this interchange acquisition module comprises: AC converter unit, AD conversion unit and the sampled data storage unit of connecting successively, wherein: AC converter unit and AD conversion unit transportation simulator amount information, sampled data information after AD conversion unit and the sampled data storage unit transmission conversion, the sampled data information of sampled data storage unit and sampled point filter element transmission buffer.
Described data preparation module is processed the crude sampling value that exchanges acquisition module output, output IEC61850-9-2 Standards Code specified standard formatted data, this data preparation module comprises: the sampled point filter element of connecting successively, secondary sampling unit and sampling message generation unit, wherein: the sampled point filter element is connected with secondary sampling unit and transmission filtering falls the sampled data information of Null Spot, secondary sampling unit is connected with sampling message generation unit and transmit sampled data is carried out the synchronously sampled data information that obtains after the double sampling, and sampling message generation unit is connected with transmission message queue unit and transmits data message information according to the standard format composition.
Described data transmission blocks comprises: send the message queue unit and be attached thereto the ethernet communication unit that connects, wherein: send the message queue unit and receive the standard data of exporting from the data preparation module and generate transmit queue to the ethernet communication unit, the ethernet communication unit sends to process-level network with this message by ethernet mac.
Described to the time module comprise: to the time information analysis unit and the sampling clock adjustment unit that is attached thereto, wherein: to the time information analysis unit with outside accurately to the time source (as pulse per second (PPS), IRIG-B signal or IEE1588 to the time main website) be connected and export the pulse per second (PPS) information adjusted to the sampling clock adjustment unit, the sampling clock adjustment unit exports synchronous good double sampling pulse to the data preparation module.
The present invention relates to a kind of interchange acquisition method with self-adaptation debug sampled value, may further comprise the steps:
The first step, to be depressurized to amplitude be the original analog of 5V and export AD conversion unit to the of ac of voltage or current transformer output by transformer;
Second step will be inputted the analog AC amount by AD conversion unit and be converted to the digital collection signal and export the sampled data storage unit to and store, and the generating digital acquisition sequence also exports the sampled point filter element to;
The analog-to-digital sampling rate of described AD conversion unit is 12800Hz,
The length of described digital collection sequence is 1～2ms;
The 3rd step, with in the digital collection sequence in chronological order continuous 3 sampled points be labeled as S1, S2 and S3, as a reference S2 is upgraded calculating with S3, generate and upgrade acquisition sequence.
Described renewal is calculated and is referred to: the size of S1, S2 and S3 at first relatively, obtain intermediate value Smid, when 4 * | S2 – Smid| greater than | during Smid|, with the updating value of Smid as S2, otherwise S2 does not do renewal.
The 4th step, according to the time module output sample frequency carry out the double sampling linear interpolation and calculate upgrading acquisition sequence, compensation no-load voltage ratio coefficient in the time of interpolation calculation, obtain at last meeting sampled data information and the outputting standard formatted data Value Data sending module of IEC61850-9-2 standard, exported by the ethernet communication unit.
Description of drawings
Fig. 1 is logical schematic of the present invention.
Fig. 2 is embodiment effect schematic diagram;
Wherein: Fig. 2 a has the original sampling data of 1 large number, after Fig. 2 b self-adaptation debug sampled value.
Embodiment
The below elaborates to embodiments of the invention, and the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment
As shown in Figure 1, the present embodiment comprises: exchange acquisition module 100, data preparation module 200, data transmission blocks 300 and to the time module 400, wherein: exchange acquisition module and receive original analog and export the digital collection signal to data preparation module 200, data preparation module 200 receive to the time module 400 outputs the double sampling pulse, and the outputting standard formatted data is to data transmission blocks 300, and data transmission blocks 300 these data messages of output are to the process layer Ethernet.
Described interchange acquisition module 100 is changed to digital signal with the original analog of input, this interchange acquisition module 100 comprises: AC converter unit 101, AD conversion unit 102 and the sampled data storage unit 103 of connecting successively, wherein: AC converter unit 101 and AD conversion unit 102 transportation simulator amount information, AD conversion unit 102 and sampled data storage unit 103 transmission sampled data information, sampled data storage unit 103 and sampled point filter element transmission sampled data cache information.
200 pairs of described data preparation modules exchange the crude sampling value of acquisition module 100 outputs and process, output IEC61850-9-2 Standards Code specified standard formatted data, this data preparation module comprises: the sampled point filter element of connecting successively, secondary sampling unit 202 and sampling message generation unit 203, wherein: the sampled point filter element be connected with secondary sampling unit 202 and transmission filtering after original sampling data information, secondary sampling unit 202 be connected with sampling message generation unit 203 and transmitting synchronous after the double sampling data message, sampling message generation unit 203 with send the message queue unit also sampled data message information of transmission standard form that is connected.
Described data transmission blocks 300 comprises: send message queue unit 301 and be attached thereto the ethernet communication unit 302 that connects, wherein: send message queue unit 301 and receive the standard data of exporting from data preparation module 200 and generate transmit queue to ethernet communication unit 302, ethernet communication unit 302 these messages of output are to the process layer network.
Described to the time module 400 comprise: to the time information analysis unit 401 and the sampling clock adjustment unit 402 that is attached thereto, wherein: to the time information analysis unit 401 with outside accurately to the time source (as pulse per second (PPS), IRIG-B signal or IEE1588 to the time main website) be connected and export the pulse per second (PPS) information adjusted to sampling clock adjustment unit 402, sampling clock adjustment unit 402 exports synchronous good double sampling pulses to data preparation module 200.
This enforcement realizes exchanging by following steps and gathers:
The first step, to be depressurized to amplitude be the original analog of 5v and export the AD conversion unit unit to the of ac of voltage or current transformer output by transformer;
Second step will be inputted the analog AC amount by AD conversion unit 102 and be converted to the digital collection signal and export sampled data storage unit 103 to and store, and the generating digital acquisition sequence also exports sampled point filter element unit to;
The analog-to-digital sampling rate of described AD conversion unit 102 is 12800Hz,
The length of described digital collection sequence is 1～2ms;
The 3rd step, with in the digital collection sequence in chronological order continuous 3 sampled points be labeled as S1, S2 and S3, as a reference S2 is upgraded calculating with S3, generate and upgrade acquisition sequence.
Described renewal is calculated and is referred to: the size of S1, S2 and S3 at first relatively, and obtain intermediate value Smid, then judge 4 * | whether S2 – Smid| is greater than | Smid|;
Set up when judging, then with the updating value of Smid as S2, otherwise S2 does not do renewal.
The 4th step, according to the time module 400 output sample frequency carry out the double sampling linear interpolation and calculate upgrading acquisition sequence, compensation no-load voltage ratio coefficient in the time of interpolation calculation, obtain at last meeting message information and the outputting standard formatted data Value Data sending module 300 of IEC61850-9-2 standard, by 302 outputs of ethernet communication unit.
Above-described compensation no-load voltage ratio coefficient refers to: the error coefficient of the comprehensive no-load voltage ratio measured value of mutual inductor and acquisition circuit and calculated value can obtain by the test of the verification before the putting equipment in service.
As shown in Figure 2, Fig. 2 a is the sample waveform that original sampling data has 1 large number, and Fig. 2 b is the result of self-adaptation debug sampled value.Such sampled data, follow-up protective device need not to do the work of any targetedly fault-tolerant, also can make correct judgement.
Claims (9)
1. one kind exchanges collection merging device, it is characterized in that, comprise: exchange acquisition module, data preparation module, data transmission blocks and to the time module, wherein: exchange acquisition module and receive original analog and export the digital collection signal to the data preparation module, the data preparation module receive to the time double sampling pulse train of module output and outputting standard formatted data to data transmission blocks, data transmission blocks sends to the process layer Ethernet with these data;
Described data preparation module is processed the crude sampling value that exchanges acquisition module output, output IEC61850-9-2 Standards Code specified standard formatted data, this data preparation module comprises: the sampled point filter element of connecting successively, secondary sampling unit and sampling message generation unit, wherein: the sampled point filter element is connected with secondary sampling unit and transmission filtering falls the sampled data information of Null Spot, secondary sampling unit is connected with sampling message generation unit and transmit sampled data is carried out the synchronously sampled data information that obtains after the double sampling, and sampling message generation unit is connected with transmission message queue unit and transmits data message information according to the standard format composition.
2. interchange collection according to claim 1 merges device, it is characterized in that, described interchange acquisition module is changed to digital signal with the original analog of input, this interchange acquisition module comprises: AC converter unit, AD conversion unit and the sampled data storage unit of connecting successively, wherein: AC converter unit and AD conversion unit transportation simulator amount information, sampled data information after AD conversion unit and the sampled data storage unit transmission conversion, the sampled data information of sampled data storage unit and sampled point filter element transmission buffer.
3. interchange collection according to claim 2 merges device, it is characterized in that, described data transmission blocks comprises: send the message queue unit and be attached thereto the ethernet communication unit that connects, wherein: send the message queue unit and receive the standard data of exporting from the data preparation module and generate transmit queue to the ethernet communication unit, the ethernet communication unit sends to process-level network with this message by ethernet mac.
4. interchange collection according to claim 1 merges device, it is characterized in that, described to the time module comprise: to the time information analysis unit and the sampling clock adjustment unit that is attached thereto, wherein: to the time information analysis unit with outside accurately to the time source be connected and export the pulse per second (PPS) information adjusted to the sampling clock adjustment unit, the sampling clock adjustment unit exports synchronous good double sampling pulse to the data preparation module.
5. interchange collection according to claim 4 merges device, it is characterized in that, described accurately to the time source be pulse per second (PPS), IRIG-B signal or IEE1588 to the time main website.
6. the acquisition method of described device according to claim 3 is characterized in that, may further comprise the steps:
The first step, to be depressurized to amplitude be the original analog of 5V and export AD conversion unit to the of ac of voltage or current transformer output by transformer;
Second step will be inputted the analog AC amount by AD conversion unit and be converted to the digital collection signal and export the sampled data storage unit to and store, and the generating digital acquisition sequence also exports the sampled point filter element to;
The 3rd step, with in the digital collection sequence in chronological order continuous 3 sampled points be labeled as S1, S2 and S3, as a reference S2 is upgraded calculating with S3, generate and upgrade acquisition sequence;
The 4th step, according to the time module output sample frequency carry out the double sampling linear interpolation and calculate upgrading acquisition sequence, compensation no-load voltage ratio coefficient in the time of interpolation calculation, obtain at last meeting the sampled data information of IEC61850-9-2 standard and outputting standard formatted data to data transmission blocks, exported by the ethernet communication unit.
7. acquisition method according to claim 6 is characterized in that, the analog-to-digital sampling rate of described AD conversion unit is 12800Hz.
8. acquisition method according to claim 6 is characterized in that, the length of described digital collection sequence is 1～2ms.
9. acquisition method according to claim 6 is characterized in that, described renewal is calculated and referred to: the size that at first compares S1, S2 and S3, obtain intermediate value Smid, when 4 * | S2 – Smid| greater than | during Smid|, with the updating value of Smid as S2, otherwise S2 does not do renewal.
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| CN103575971B (en) * | 2013-11-13 | 2016-01-20 | 国家电网公司 | A kind of intelligent substation universal data collection method |
| CN103792419B (en) * | 2014-03-04 | 2016-01-20 | 济南大学 | Realize analog quantity and mix the synchronous sampling method accessed with digital quantity |
| CN109406866A (en) * | 2018-11-27 | 2019-03-01 | 北京锐创新智科技有限公司 | Signal verification device and method |
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| CN101350518A (en) * | 2008-09-05 | 2009-01-21 | 国电南瑞科技股份有限公司 | Sampling value processing method of digital protection measurement and control device |
| CN101655519A (en) * | 2009-09-14 | 2010-02-24 | 国电南京自动化股份有限公司 | Data processing method for alternating current sampling of digital transformer station measurement and control device |
| CN101988957A (en) * | 2009-07-31 | 2011-03-23 | 华东电力试验研究院有限公司 | Dynamic detection method and system of sampling accuracy of electric quantity of merging unit of substation |
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| KR101012464B1 (en) * | 2008-11-13 | 2011-02-08 | 한국전력공사 | Digital substation merging unit test method and device therefor |
| US8560255B2 (en) * | 2008-12-12 | 2013-10-15 | Schneider Electric USA, Inc. | Power metering and merging unit capabilities in a single IED |
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| CN101350518A (en) * | 2008-09-05 | 2009-01-21 | 国电南瑞科技股份有限公司 | Sampling value processing method of digital protection measurement and control device |
| CN101988957A (en) * | 2009-07-31 | 2011-03-23 | 华东电力试验研究院有限公司 | Dynamic detection method and system of sampling accuracy of electric quantity of merging unit of substation |
| CN101655519A (en) * | 2009-09-14 | 2010-02-24 | 国电南京自动化股份有限公司 | Data processing method for alternating current sampling of digital transformer station measurement and control device |
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