CN104215838A - Remote nuclear phase method for intelligent substation - Google Patents
Remote nuclear phase method for intelligent substation Download PDFInfo
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- CN104215838A CN104215838A CN201410478381.4A CN201410478381A CN104215838A CN 104215838 A CN104215838 A CN 104215838A CN 201410478381 A CN201410478381 A CN 201410478381A CN 104215838 A CN104215838 A CN 104215838A
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Abstract
The invention provides a remote nuclear phase method for an intelligent substation. The method comprises the following steps: locally acquiring and analyzing; recording the measured amplitude, phase and frequency information of the reference side; remotely acquiring and analyzing the measured amplitude, phase and frequency information of the side to be tested; compensating the error caused by remote measurement through the compensation algorithm, so as to reach the purpose of remote nuclear phase of the intelligent substation. With the adoption of the method, the problem that remote nuclear phase cannot be performed under the condition that related device cannot be normally put into operation at the initial period of construction of the intelligent substation can be solved; the nuclear phase testing efficiency of the intelligent substation can be obviously raised; meanwhile, the compensation algorithm is carried out to correct the measuring error, thus the measuring precision is raised, and the nuclear phase measuring result is accurate.
Description
Technical field
The present invention relates to intelligent substation technical field of measurement and test, be specifically related to a kind of intelligent substation strange land nuclear phase detection method.
Background technology
Nuclear phase refer to relevant device check two power supplys or loop phase, whether phase sequence identical.At intelligent substation after newly-built or reorganization and expansion, before user's power transmission, the test of three-phase circuit nuclear phase must be carried out, to guarantee that transmission line of electricity phase sequence is consistent with the required phase sequence of user's threephase load.
Traditional intelligent substation nuclear-phase method is in primary side boosting mostly, then on protective device, oscillograph or special phase checking device, checks relevant measured phase place, thus judges the phase differential between two-way power supply.Following problem is there is in these methods in actual mechanical process:
1. intelligent substation first stage of construction, the wall in standing and process-level network may also not built, and primary side data cannot reach protective device or oscillograph from mutual inductor;
2. gather the mutual inductor possibility a good distance off at the scene of two-way power supply, when intelligent substation wall and process-level network normally do not work, be difficult to monitor two-way power supply signal simultaneously;
3. intelligent substation relevant criterion domestic at present also not unification, Guo Wang company adopts Point-to-Point Data Transmission pattern, and Nan Wang company adopts the mode of networking to transmit data.Under two kinds of patterns, the processing mode of data is different, can not by same way process data;
4. in intelligent substation, data sampling rate only has 4000Hz, and for power frequency component, the sampled point of each cycle only has 80 points, and data volume is less.The data that the mode of direct Fourier transform obtains, degree of accuracy is very poor, and the signal particularly exported at voltage or current source is nonstandard, and when frequency is unstable, the data error obtained is larger.
5., due to the complicacy of electrical network, the electric voltage frequency of reference side and side to be measured can not keep power frequency to export always, and both sides frequency also can not be kept completely the same.The frequency departure of 0.001Hz, will produce 0.001Hz*360 °=0.36 ° error 1 second, the time consumed in the measuring process of strange land, this very little error will cause very large measuring error.
Traditional intelligence transformer station nuclear-phase method, higher to on-the-spot test environmental requirement as can be seen here, and operability is not strong, do not do frequency-tracking and compensate, well can not realize the function of strange land nuclear phase when analyzing data
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of intelligent substation strange land nuclear-phase method, comprising the following steps:
Step one: record the measured real time data of reference side and side to be measured respectively, wherein with the electrical network of current operation for reference side, need grid-connected part to be side to be measured, then obtain measured amplitude, phase place, frequency information respectively through analysis;
Step 2: compensate side to be measured and reference side measured between strange land measuring error;
Step 3: calculate phase differential measured between side to be measured and reference side, and show with the form of figure and form.
Described a kind of intelligent substation strange land nuclear-phase method, recording measured real time data in described step one is electric parameters in following at least one signal:
Signal A: the simulation small-signal that For The Rogowski Optical Current Transformer exports;
Signal B: the standard analog signal that conventional electromagnetic Current Transformer Secondary side exports;
Signal C: the collector light digital signal that For The Rogowski Optical Current Transformer exports;
Signal D: through the light numeral SV sampled value signal of IEC61850-9-1, IEC61850-9-2 or IEC60044-8 form that merge cells MU exports.
A kind of intelligent substation strange land according to claim 2 nuclear-phase method,
The data recording fashion of signal A and B is: introduce standard clock source, from whole second, gather analog data, continuously the data of record two cycles;
The data recording fashion of signal C and D is: from receiving the start of message (SOM) that sampling sequence number is 0, record data, continuously the data of record two cycles.
Described a kind of intelligent substation strange land nuclear-phase method, the measured real time data of the reference side recorded in step one is retained as reference data, and the measured real time data in the side to be measured of recording is real-time update.Have several circuits in a transformer station, each needs grid-connected circuit to be all side to be measured.Need specialized equipment to apply voltage on the line time doing experiment in scene, be generally a circuit surveyed again equipment is forwarded to next circuit continue measure.
Described a kind of intelligent substation strange land nuclear-phase method, in step one, comprises the analysis of gathered real time data: first by raw data through Fourier transform, then carry out frequency compensation, to obtain the exact numerical of amplitude, phase place, frequency.
Described a kind of intelligent substation strange land nuclear-phase method, in step 2, compensating side to be measured with the method for the measuring error between reference side voltage or electric current is that sequence number is alignd or markers is alignd.
Described a kind of intelligent substation strange land nuclear-phase method, the data adopting sequence number alignment thereof to compensate measuring error turn and are directly used by step 3.
Described a kind of intelligent substation strange land nuclear-phase method, the method adopting markers alignment to compensate measuring error comprises following steps:
Step 1: find out the time channel in reference side and side data to be measured, be designated as t, unit is s, if not free passage, then this side time is 0;
Step 2: obtain measured frequency, be designated as f, unit is Hz;
Step 3: measured phase compensation value Φ=360*t*f, unit is °;
Described a kind of intelligent substation strange land nuclear-phase method, during compensation of phase difference, compensate the differential seat angle caused by the frequency departure of reference side and side to be measured voltage or electric current, compensation method is:
Step 1: the moment that reference side starts to record data is for the last time designated as t1, unit is s, and the measured frequency obtained after analyzing data is designated as f1, and unit is Hz;
Step 2: the side to be measured current moment starting to record data is designated as t2, and unit is s;
Step 3: measured phase compensation value Φ=(t2-t1) * f1*360, the value obtained divided by 360, remainder number.
Described intelligent substation strange land nuclear-phase method, reference side and the measured of side to be measured are at least one, and the one or more measured of side to be measured can compare with the one or more measured of reference side.
The present invention achieves following technique effect:
The present invention can solve at intelligent substation first stage of construction, and relevant device can not in bringing normally into operation situation, cannot the problem of strange land nuclear phase, can significantly improve intelligent substation nuclear phase testing efficiency.The method is by backoff algorithm simultaneously, have modified measuring error, improves measuring accuracy, make nuclear phase measurement result more accurate.
Accompanying drawing explanation
Fig. 1 is intelligent substation strange land nuclear phase schematic diagram;
Schematic diagram when Fig. 2 is measure analog signals;
Fig. 3 is schematic diagram when measuring digital quantity signal.
Embodiment
Understand for the ease of the common counting personnel in this area and implement the present invention, below in conjunction with the drawings and the specific embodiments, the present invention is described in further detail.
The invention provides a kind of intelligent substation strange land nuclear-phase method, principle as shown in Figure 1, comprises the following steps:
A) record the measured real time data of reference side, obtain measured amplitude, phase place, frequency information by analysis;
B) record the measured real time data in side to be measured, obtain measured amplitude, phase place, frequency information by analysis;
C) compensate side to be measured and reference side measured between strange land measuring error;
D) calculate and show phase differential measured between side to be measured and reference side with the form of figure and form.
In addition, whether identically need to check both sides voltage-phase before grid-connected, can not be grid-connected when phase place is different, need the wiring of checkout facility.
Measuredly to comprise: the simulation small-signal that photoelectric voltage current transformer exports; The standard analog signal that conventional electromagnetic voltage current transformer secondary side exports; The collector light digital signal that photoelectric voltage current transformer exports; Through the light numeral SV sampled value signal of IEC61850-9-1, IEC61850-9-2 or IEC60044-8 form that merge cells MU exports.
Gather the simulation small-signal that photoelectric voltage current transformer exports, or conventional electromagnetic voltage current transformer secondary side export standard analog signal time, need to introduce standard clock source, adopt the mode shown in Fig. 2, external clock source on harvester.From whole second, gather analog data, continuously the data of record two cycles, sampling rate should be too not low, at least will reach 4000Hz.
Gather the collector light digital signal that photoelectric voltage current transformer exports, or when the light numeral SV sampled value signal of IEC61850-9-1, IEC61850-9-2 or IEC60044-8 form that merge cells MU exports, the mode shown in Fig. 3 of employing, from receiving the start of message (SOM) that sampling sequence number is 0, record data, the continuously data of record two cycles.
In test process, first record the measured real time data of reference side, and preserve measured amplitude, phase place, frequency information.Then in the data that side to be measured real-time update is measured, compare with reference side data.
When calculating amplitude, phase place, frequency by the real time data of record, first obtain measured amplitude, phase place by Fourier transform, obtain frequency values by frequency-tracking backoff algorithm again, finally again by frequency values correction amplitude, phase place, thus obtain the exact value of amplitude, phase place, frequency.The computing method of this amplitude, phase place, frequency are applicable in the measured computation process of reference side and side to be measured simultaneously.
Through above process, measured amplitude, phase place, the frequency information of reference side and side to be measured can be obtained, after obtaining reference side is measured and side to be measured is measured amplitude, phase place, frequency values, need to compensate because strange land operates the error brought.Compensation way has sequence number alignment compensation and markers alignment compensation.When adopting sequence number compensation way, can raw data be directly used to calculate.When adopting markers alignment compensation mode, need the phase differential that compensation source sampling time delay causes.Concrete steps are: preserve the information that reference side is measured, and record starts the moment of recording the tested value of reference side for the last time, and be designated as t1, unit is s (second); Record the frequency that last measuring basis side is measured, be designated as f1, unit is Hz (hertz).The refreshing measured per second of side to be measured once, compares with the data of reference side, after over-compensation, obtains phase differential.Find out the time channel in reference side and side data to be measured, be designated as t, unit is s, if not free passage, then this side time is 0; Obtain measured frequency, be designated as f, unit is Hz (hertz); Measured phase compensation value, Φ=360*t*f, unit is ° (degree).
Compensate for because reference side and side to be measured are sampled after the different error caused of time delay, also to compensate because of the different error caused of frequency of operation between reference side from side system to be measured, concrete compensation method is: the moment that record reference side starts to record data is for the last time designated as t1, unit is s (second), the measured frequency obtained after analyzing data is designated as f1, and unit is Hz (hertz); Recording the side to be measured current moment starting to record data is designated as t2, and unit is s (second); Measured phase compensation value Φ=(t2-t1) * f1*360, the value obtained divided by 360, remainder number.
Strange land nuclear phase needs compensation two errors, and one is by the asynchronous error caused of data source acquisition mode; One is by the reference side error that cause different from side system frequency to be measured.During the error that compensation factor causes according to source acquisition mode difference, the data transfer mode again because of current domestic intelligent substation sampling is different, is divided into sequence number to align and markers is alignd two kinds of compensation ways.These two kinds of alignment thereof are modes relatively more conventional at present, and protection producer also processes on this basis.Because the electric current and voltage of reality exports the process of data through collecting merge cells, have certain time delay, this just needs us when these data convert being gathered to it after receiving data, and then carry out subsequent analysis, otherwise not data are in the same time compared just lose the meaning of comparison.
Merge cells gathers voltage and current signal with fixing sampling rate, and data are transferred to the equipment such as protection with the form of digital message.When protection receives message, need the collection moment knowing data.The method obtaining the data acquisition moment has two kinds, a kind of mode judges to gather the moment according to the sequence number carried in message, such as merge cells is with the sampling rate image data of 4000Hz, sampling time interval is 250 microseconds, often gather a secondary data, capital has unique sequence number corresponding with it, during whole second, sampling sequence number is 0, then add up successively, when starting to next second, sequence number makes zero, and sequence number so circulates, be multiplied by sampling time interval by sequence number, just can show that this sampled point is working as the sampling instant in last second.Sequence number alignment is exactly around this principle, and think the message that sampling sequence number is identical, its collection moment is also identical; Another kind of mode records the moment received after protection receives message, then extrapolates the data acquisition moment according to the sampling time delay marked in message.Primary side voltage be power frequency 50Hz ideally, the data of n-th sampled point of this second are identical with the data of n-th sampled point of next second, therefore the part of second more than can be ignored, directly obtained the moment of second below by above-mentioned two kinds of modes, then the data of synchronization are compared.
Set of samples net mode transmission data intelligent substation in, mutual inductor with station in all strict pair of device time, the label in SV message in fact also marked the moment of data acquisition.Adopt sequence number alignment thereof in such a mode, the data of reference side and side to be measured are without the need to doing special processing again.
Directly adopt in the intelligent substation of straight jumping technology in sampling, when mutual inductor does not need pair, interior device of stand also can normally run.Device is to receive the moment of message, and the transmission delay cut in message just obtains the collection moment of raw data, reaches the effect that multi-channel sampling is synchronous in this way.The mode of markers of should sampling in such a mode alignment.Time channel value in measured message is designated as t2, and unit is s (second); Measured frequency is designated as f2, and unit is Hz (hertz), measured phase compensation value Φ=360*t*f, and unit is ° (degree).
When compensating the error caused because reference side is different from side system frequency to be measured, the side to be measured current moment starting to record measured data is designated as t3, and unit is s (second), measured phase compensation value Φ=(t3-t1) * f1*360, the value obtained divided by 360, remainder number.
By twice compensation, the error in the nuclear phase process of strange land substantially can be eliminated.Last with the result of the mode display measurement of chart.When showing to graphically, adopt the mode of conventional phasor graph to show, with reference side data for background, the yellowish green red trichromatism of three-phase data distinguishes; Side data to be measured refreshing per second once, show the measured and reference side in side to be measured measured between differential seat angle and amplitude difference.When showing in a tabular form, adopt the mode of amplitude+phase angle to show, point upper and lower two screens show measured amplitude, the phase information of reference side and side to be measured respectively, and provide the result of calculation of homophase and alternate phasor difference, analyze for commissioning staff.
In test process, when reference side is constant, after testing a side data, testing apparatus can be moved to lower side, continue to measure this side data, improve the work efficiency in test process.
Claims (10)
1. an intelligent substation strange land nuclear-phase method, is characterized in that, comprises the following steps:
Step one: record the measured real time data of reference side and side to be measured respectively, wherein with the electrical network of current operation for reference side, need grid-connected part to be side to be measured, then obtain measured amplitude, phase place, frequency information respectively through analysis;
Step 2: compensate side to be measured and reference side measured between strange land measuring error;
Step 3: calculate phase differential measured between side to be measured and reference side, and show with the form of figure and form.
2. a kind of intelligent substation strange land according to claim 1 nuclear-phase method, is characterized in that: recording measured real time data in described step one is electric parameters in following at least one signal:
Signal A: the simulation small-signal that For The Rogowski Optical Current Transformer exports;
Signal B: the standard analog signal that conventional electromagnetic Current Transformer Secondary side exports;
Signal C: the collector light digital signal that For The Rogowski Optical Current Transformer exports;
Signal D: through the light numeral SV sampled value signal of IEC61850-9-1, IEC61850-9-2 or IEC60044-8 form that merge cells MU exports.
3. a kind of intelligent substation strange land according to claim 2 nuclear-phase method, is characterized in that:
The data recording fashion of signal A and B is: introduce standard clock source, from whole second, gather analog data, continuously the data of record two cycles;
The data recording fashion of signal C and D is: from receiving the start of message (SOM) that sampling sequence number is 0, record data, continuously the data of record two cycles.
4. a kind of intelligent substation strange land according to claim 1 nuclear-phase method, it is characterized in that: the measured real time data of the reference side recorded in step one is retained as reference data, the measured real time data in the side to be measured of recording is real-time update.
5. a kind of intelligent substation strange land according to claim 1 nuclear-phase method, it is characterized in that: in step one, the analysis of gathered real time data is comprised: first by raw data through Fourier transform, then carry out frequency compensation, to obtain the exact numerical of amplitude, phase place, frequency.
6. a kind of intelligent substation strange land according to claim 1 nuclear-phase method, is characterized in that: in step 2, and compensating side to be measured with the method for the measuring error between reference side voltage or electric current is that sequence number is alignd or markers is alignd.
7. a kind of intelligent substation strange land according to claim 6 nuclear-phase method, is characterized in that: the data adopting sequence number alignment thereof to compensate measuring error turn and directly used by step 3.
8. a kind of intelligent substation strange land according to claim 6 nuclear-phase method, is characterized in that: the method adopting markers alignment to compensate measuring error comprises following steps:
Step 1: find out the time channel in reference side and side data to be measured, be designated as t, unit is s, if not free passage, then this side time is 0;
Step 2: obtain measured frequency, be designated as f, unit is Hz;
Step 3: measured phase compensation value Φ=360*t*f, unit is °.
9. a kind of intelligent substation strange land according to claim 1 nuclear-phase method, is characterized in that: during compensation of phase difference, compensate the differential seat angle caused by the frequency departure of reference side and side to be measured voltage or electric current, compensation method is:
Step 1: the moment that reference side starts to record data is for the last time designated as t1, unit is s, and the measured frequency obtained after analyzing data is designated as f1, and unit is Hz;
Step 2: the side to be measured current moment starting to record data is designated as t2, and unit is s;
Step 3: measured phase compensation value Φ=(t2-t1) * f1*360, the value obtained divided by 360, remainder number.
10. intelligent substation strange land according to claim 1 nuclear-phase method, is characterized in that: reference side and the measured of side to be measured are at least one, and the one or more measured of side to be measured can compare with the one or more measured of reference side.
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| CN106771678A (en) * | 2016-12-14 | 2017-05-31 | 国网江苏省电力公司检修分公司 | A kind of phase detecting method and device based on Hilbert-Huang transform and expert system |
| CN108957231A (en) * | 2018-07-17 | 2018-12-07 | 国网辽宁省电力有限公司电力科学研究院 | A kind of method of distributed system and its host and handset data interaction |
| CN109254221A (en) * | 2018-11-26 | 2019-01-22 | 南方电网科学研究院有限责任公司 | Data processing method of intelligent substation |
| CN110161326A (en) * | 2019-04-26 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of more network live nuclear-phase methods and system at a distance |
| CN110726884A (en) * | 2019-11-21 | 2020-01-24 | 国网福建省电力有限公司 | Remote phase checking instrument based on charged indicator and phase checking method |
| CN110988506A (en) * | 2019-11-10 | 2020-04-10 | 国网浙江省电力有限公司台州供电公司 | Secondary wireless nuclear phase instrument for intelligent substation |
| CN111913051A (en) * | 2020-05-25 | 2020-11-10 | 威胜信息技术股份有限公司 | Method for automatically adjusting phase sequence of power distribution network, monitoring unit and monitoring system |
| CN115902400A (en) * | 2023-02-15 | 2023-04-04 | 保定正恒电力科技有限公司 | Measuring device and method for remote asynchronous angular difference based on metering chip |
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| CN110161326A (en) * | 2019-04-26 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of more network live nuclear-phase methods and system at a distance |
| CN110988506A (en) * | 2019-11-10 | 2020-04-10 | 国网浙江省电力有限公司台州供电公司 | Secondary wireless nuclear phase instrument for intelligent substation |
| CN110726884A (en) * | 2019-11-21 | 2020-01-24 | 国网福建省电力有限公司 | Remote phase checking instrument based on charged indicator and phase checking method |
| CN111913051A (en) * | 2020-05-25 | 2020-11-10 | 威胜信息技术股份有限公司 | Method for automatically adjusting phase sequence of power distribution network, monitoring unit and monitoring system |
| CN115902400A (en) * | 2023-02-15 | 2023-04-04 | 保定正恒电力科技有限公司 | Measuring device and method for remote asynchronous angular difference based on metering chip |
| CN115902400B (en) * | 2023-02-15 | 2023-06-16 | 保定正恒电力科技有限公司 | Measuring device and method for off-site asynchronous angular difference based on metering chip |
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