CN104215838B - Remote nuclear phase method for intelligent substation - Google Patents
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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, and in particular to a kind of intelligent substation strange land nuclear phase detection side
Method.
Background technology
Whether nuclear phase refers to identical with relevant device two power supplys of verification or loop phase, phase sequence.Pass through in intelligent substation
After newly-built or reorganization and expansion, to before user's power transmission, it is necessary to carry out three-phase circuit nuclear phase test, to guarantee transmission line of electricity phase sequence and use
Threephase load required phase sequence in family is consistent.
Traditional intelligent substation nuclear-phase method be mostly in a side boosting, then protection device, oscillograph or
Related measured phase place is checked on special phase checking device, so as to judge the phase contrast between two-way power supply.These methods are in reality
There is problems with the operating process of border：
1. intelligent substation first stage of construction, stand in wall and process-level network may also not build and complete, once
Side data cannot reach protection device or oscillograph from transformer；
2. gather two-way power supply transformer at the scene may a good distance off, in intelligent substation wall and process layer net
During the non-normal work of network, it is difficult to while monitor two-way power supply signal；
3. intelligent substation relevant criterion domestic at present is not also unified, and Guo Wang companies adopt Point-to-Point Data Transmission mould
Formula, and Nan Wang companies transmission data by the way of networking.Under both of which, the processing mode of data is different, it is impossible to together
A kind of mode processing 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, data volume are less.The data for directly being obtained with the mode of Fourier transformation, degree of accuracy are very poor, particularly in voltage or
The signal of current source output is nonstandard, and when frequency is unstable, the error in data for obtaining is bigger.
5., due to the complexity of electrical network, reference side can not possibly be always maintained at power frequency output with the electric voltage frequency of side to be measured,
Both sides frequency will not be kept completely the same.The frequency departure of 0.001Hz, will produce 0.001Hz*360 °=0.36 ° mistake for 1 second
Difference, the time consumed in the measurement process of strange land, the error of this very little will result in very big measurement 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, point
Frequency-tracking compensation is not done during analysis data, it is impossible to realize the function of strange land nuclear phase well
The content of the invention
In order to solve above-mentioned technical problem, the present invention provides a kind of intelligent substation strange land nuclear-phase method, including following step
Suddenly：
Step one：The measured real time data in reference side and side to be measured is recorded respectively, wherein the electrical network with current operation is
Reference side, needs grid-connected part to be side to be measured, then obtains measured amplitude, phase place, frequency information respectively through analysis；
Step 2：Compensate side to be measured and reference side it is measured between strange land measurement error；
Step 3：Phase contrast measured between side to be measured and reference side is calculated, and in the form of figure and form
Show.
A kind of described intelligent substation strange land nuclear-phase method, record in the step one measured real time data be with
Electric parameters in lower at least one signal：
Signal A:The simulation small-signal of The Rogowski Optical Current Transformer output；
Signal B:The standard analog signal of conventional electromagnetic Current Transformer Secondary side output；
Signal C:The harvester light digital signal of The Rogowski Optical Current Transformer output；
Signal D:The light of IEC61850-9-1, IEC61850-9-2 or IEC60044-8 form of ECDC unit MU outputs
Digital SV samplings value signal.
A kind of intelligent substation strange land nuclear-phase method according to claim 2,
The data recording fashion of signal A and B is：Standard clock source is introduced, starts to gather analog data from the whole second, continuously
The data of two cycles of record；
The data recording fashion of signal C and D is：From the start of heading that sampling sequence number is 0 is received, record data is continuous to remember
The data of two cycles of record.
A kind of described intelligent substation strange land nuclear-phase method, the measured real-time number of the reference side recorded in step one
According to being retained as benchmark data, the measured real time data in the side to be measured that recorded is real-time update.One power transformation
There are several circuits in standing, each needs grid-connected circuit to be all side to be measured.Need special equipment online when scene is done experiment
Applied voltage on road, usually one circuit have been surveyed and equipment have been gone to next circuit continuation measurement again.
A kind of described intelligent substation strange land nuclear-phase method, in step one, the analysis bag of the real time data to being gathered
Include：First by initial data through Fourier transformation, then frequency compensation is carried out, to obtain the perfect number of amplitude, phase place, frequency
Value.
A kind of described intelligent substation strange land nuclear-phase method, in step 2, compensates side to be measured with reference side voltage or electricity
The method of the measurement error between stream is that sequence number is alignd or markers alignment.
A kind of described intelligent substation strange land nuclear-phase method, compensates the number of measurement error using sequence number alignment thereof
Directly used by step 3 according to turn.
A kind of described intelligent substation strange land nuclear-phase method, compensates the method bag of measurement error using markers alignment
Containing following steps：
Step 1：The time channel in reference side and side data to be measured is found out, t is designated as, unit is s, if no time is logical
Road, then the side time is 0；
Step 2：Measured frequency is obtained, f is designated as, unit is Hz；
Step 3：Measured phase compensation value Φ=360*t*f, unit for °；
A kind of described intelligent substation strange land nuclear-phase method, during compensation phase contrast, compensate by reference side and side to be measured
The differential seat angle that the frequency departure of voltage or electric current causes, compensation method is：
Step 1：The moment of reference side last time start recording data is designated as t1, and unit is s, is obtained after analytical data
Measured frequency is designated as f1, and unit is Hz；
Step 2：The moment of the current start recording data in side to be measured is designated as t2, and unit is s；
Step 3：Measured phase compensation value Φ=(t2-t1) * f1*360, the value for obtaining are taken the remainder divided by 360.
The measured of described intelligent substation strange land nuclear-phase method, reference side and side to be measured is at least one, side to be measured
One or more measured measured with one or more of reference side can compare.
The present invention achieves following technique effect：
The present invention can be solved in intelligent substation first stage of construction, in the case of relevant device is unable to bringing normally into operation, it is impossible to different
The problem of ground nuclear phase, is remarkably improved intelligent substation nuclear phase testing efficiency.The method have modified survey by backoff algorithm simultaneously
Amount error, improves certainty of measurement so that nuclear phase measurement result is more accurate.
Description of the drawings
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.
Specific embodiment
Personnel are commonly counted for the ease of this area to understand and implement the present invention, below in conjunction with the accompanying drawings and specific embodiment
The present invention is described in further detail.
The present invention provides a kind of intelligent substation strange land nuclear-phase method, and principle is as shown in figure 1, comprise the following steps：
A) the measured real time data of reference side is recorded, measured amplitude, phase place, frequency information is obtained by analysis；
B) the measured real time data in side to be measured is recorded, measured amplitude, phase place, frequency information is obtained by analysis；
C) the strange land measurement error between compensation side to be measured and reference side are measured；
D) calculate and phase contrast measured between side to be measured and reference side is shown in the form of figure and form.
In addition, needing to check whether both sides voltage-phase is identical before grid-connected, phase place can not be grid-connected when different, needs inspection
Look into the wiring of equipment.
It is measured including：The simulation small-signal of photoelectric voltage current transformer output；Conventional electromagnetic voltage x current is mutual
The standard analog signal of sensor secondary side output；The harvester light digital signal of photoelectric voltage current transformer output；ECDC
And the light numeral SV sampling value signals of IEC61850-9-1, IEC61850-9-2 or IEC60044-8 form of unit MU outputs.
The simulation small-signal of collection photoelectric voltage current transformer output, or conventional electromagnetic voltage current transformer
During the standard analog signal of secondary side output, need to introduce standard clock source, by the way of shown in Fig. 2, on harvester
External clock source.Start to gather analog data from the whole second, continuously the data of two cycles of record, sample rate should not be too low, extremely
4000Hz will be reached less.
The harvester light digital signal of collection photoelectric voltage current transformer output, or ECDC unit MU outputs
During the light numeral SV sampling value signals of IEC61850-9-1, IEC61850-9-2 or IEC60044-8 form, using shown in Fig. 3
Mode, from the start of heading that sampling sequence number is 0 is received, record data continuously records the data of two cycles.
In test process, the measured real time data of reference side is first recorded, and preserves measured amplitude, phase place, frequency letter
Breath.Then in the data that side real-time update to be measured is measured, it is compared with benchmark side data.
When amplitude, phase place, frequency are calculated by the real time data for recording, first pass through Fourier transformation and obtain measured width
Value, phase place, then frequency values, last reuse frequency value amendment amplitude, phase place, so as to obtain are obtained by frequency-tracking backoff algorithm
Amplitude, phase place, the exact value of frequency.This amplitude, phase place, the computational methods of frequency are applied to reference side and side to be measured simultaneously
In measured calculating process.
Through above procedure, the reference side amplitude measured with side to be measured, phase place, frequency information can be obtained, is being obtained
After the measured amplitude in the measured and to be measured side of reference side, phase place, frequency values, the error for needing compensation to bring because of strange land operation.
Compensation way has sequence number alignment compensation and markers alignment compensation.During using sequence number compensation way, initial data can be used directly and does
Calculate.During using markers alignment compensation mode, need to compensate the phase contrast that source sampling time delay is caused.Comprise the concrete steps that：Preserve
The measured information of reference side, and the moment of the tested value of last time start recording reference side is recorded, t1 is designated as, unit is s
(second)；The measured frequency in record last time measuring basiss side, is designated as f1, and unit is Hz (hertz).Side to be measured it is measured
Refreshing per second once, is compared with the data of reference side, phase contrast is obtained after compensation.Find out reference side and side number to be measured
Time channel according in, is designated as t, and unit is s, if no time channel, the side time is 0；Measured frequency is obtained,
F is designated as, unit is Hz (hertz)；Measured phase compensation value, Φ=360*t*f, unit are ° (spending).
After compensate for because of the reference side error for causing different from side sampling time delay to be measured, to also compensate because reference side with it is to be measured
The error that operating frequency difference causes between side system, concrete compensation method is：Record reference side last time start recording number
According to moment be designated as t1, unit is s (second), and the measured frequency obtained after analytical data is designated as f1, and unit is Hz (hertz)；Note
The moment for recording the current start recording data in side to be measured is designated as t2, and unit is s (second)；Measured phase compensation value Φ=(t2-t1) *
F1*360, the value for obtaining are taken the remainder divided by 360.
Strange land nuclear phase needs to compensate two errors, and one is by the asynchronous error for causing of data source acquisition mode；One
It is by the reference side error for causing different from side system frequency to be measured.The error that compensation factor causes according to source acquisition mode difference
When, and because the data transfer mode of current domestic intelligent substation sampling is different, it is divided into two kinds of benefits of sequence number alignment and markers alignment
Repay mode.Both alignment thereofs are modes the more commonly used at present, and protection producer is also to process on this basis.Because real
The voltage x current on border passes through the process for collecting combining unit output data, has certain time delay, and this is accomplished by us and is receiving
At the moment these data converts gathered to which to after data, subsequent analysis are then carried out again, otherwise by data not in the same time
Compare and just lose the meaning of comparison.
Data are transferred to guarantor in the form of digital message with fixed sample rate collection voltages current signal by combining unit
The equipment such as shield.When protection receives message, need to know the collection moment of data.The method for obtaining the data acquisition moment has two kinds,
A kind of mode is that such as combining unit is gathered with the sample rate of 4000Hz judging to gather the moment according to the sequence number carried in message
Data, sampling time interval are 250 microseconds, often gather a secondary data, can all have unique sequence number to correspond to therewith, are sampled during the whole second
Serial number 0, is then added up successively, and when starting by next second, sequence number zero, sequence number are so circulated, and are multiplied by the sampling time with sequence number
Interval, it is possible to draw the sampled point when the sampling instant in the previous second.Sequence number alignment is exactly around this principle, it is believed that adopted
Sample sequence number identical message, its collection moment is also identical；Another way protection is recorded after receiving message and is received
At the moment, the data acquisition moment is extrapolated according to the sampling time delay of labelling in message then.It is power frequency 50Hz in primary side voltage
Ideally, the data of n-th sampled point of this second and the data of n-th sampled point of next second are identicals, therefore
The part of more than second can be ignored, the moment of below second is directly obtained by above two mode, then by the data of synchronization
Compare.
In the intelligent substation of sampling networking mode transmission data, in transformer and station during all strict pair, device, SV reports
Label in text actually also marked the moment of data acquisition.In such a mode adopt sequence number alignment thereof, reference side with
The data of side to be measured are without the need for doing special handling again.
In the intelligent substation that straight jumps technology is directly adopted in sampling, transformer need not pair when, interior device of standing also normally can be transported
OK.Device cuts the collection moment that the transmission delay in message has just obtained initial data to receive the moment of message, with this
Mode reaches the synchronous effect of multi-channel sampling.The mode of markers of should sampling in such a mode alignment.In measured message when
Between channel value be designated as t2, unit is s (second)；Measured frequency is designated as f2, and unit is Hz (hertz), measured phase compensation value Φ
=360*t*f, unit are ° (spending).
During the error that compensation causes because reference side is different from side system frequency to be measured, the current start recording in side to be measured is measured
The moment of data is designated as t3, and unit is s (second), measured phase compensation value Φ=(t3-t1) * f1*360, the value for obtaining divided by
360, take the remainder.
By compensating twice, the error during the nuclear phase of strange land can be substantially eliminated.Finally graphically show
The result of measurement.When showing to graphically, shown by the way of conventional phasor diagram, with benchmark side data as background, three
Phase data is distinguished with yellowish green red trichromatism；Side data to be measured is per second to be refreshed once, shows that side to be measured is measured tested with reference side
Differential seat angle and amplitude difference between amount.When showing in a tabular form, shown by the way of amplitude+phase angle, be divided to upper and lower two screen
The measured amplitude in reference side and side to be measured, phase information are shown respectively, and the calculating of homophase and alternate phasor difference is provided
As a result, so that commissioning staff analyzes.
In test process, in the case where reference side is constant, after having tested a side data, test equipment can be moved to next
Side, continues to measure the side data, improves the work efficiency in test process.
Claims (7)
1. a kind of intelligent substation strange land nuclear-phase method, it is characterised in that comprise the following steps：
Step one：The measured real time data in reference side and side to be measured is recorded respectively, wherein on the basis of the electrical network of current operation
Side, needs grid-connected part to be side to be measured, then obtains measured amplitude, phase place, frequency information respectively through analysis；
Step 2：Compensate side to be measured and reference side it is measured between strange land measurement error；
Step 3：Phase contrast measured between side to be measured and reference side is calculated, and is shown in the form of figure and form；
During compensation phase contrast, the differential seat angle caused by the frequency departure of reference side and side voltage to be measured or electric current, compensation to be compensated
Method is：
Step 1：The moment of reference side last time start recording data is designated as t1, and unit is s, and what is obtained after analytical data is tested
Amount frequency is designated as f1, and unit is Hz；
Step 2：The moment of the current start recording data in side to be measured is designated as t2, and unit is s；
Step 3：Measured phase compensation value Φ=(t2-t1) * f1*360, the value for obtaining are taken the remainder divided by 360；
In step 2, compensate side to be measured and align for sequence number with the method for the measurement error between reference side voltage or electric current or markers
Alignment；
The method that measurement error is compensated using markers alignment is comprised the steps of：
Step 1：The time channel in reference side and side data to be measured is found out, t is designated as, unit is s, if reference side or side to be measured
Middle either side does not have time channel, then the side time is 0；
Step 2：Measured frequency is obtained, f is designated as, unit is Hz；
Step 3：Measured phase compensation value Φ=360*t*f, unit for °.
2. a kind of intelligent substation strange land nuclear-phase method according to claim 1, it is characterised in that：Remember in the step one
The measured real time data of record is the electric parameters in following at least one signal：
Signal A:The simulation small-signal of The Rogowski Optical Current Transformer output；
Signal B:The standard analog signal of conventional electromagnetic Current Transformer Secondary side output；
Signal C:The harvester light digital signal of The Rogowski Optical Current Transformer output；
Signal D:The light numeral of IEC61850-9-1, IEC61850-9-2 or IEC60044-8 form of ECDC unit MU outputs
SV sampling value signals.
3. a kind of intelligent substation strange land nuclear-phase method according to claim 2, it is characterised in that：
The data recording fashion of signal A and B is：Standard clock source is introduced, starts to gather analog data from the whole second, it is continuous to record
The data of two cycles；
The data recording fashion of signal C and D is：From the start of heading that sampling sequence number is 0 is received, record data continuously records two
The data of individual cycle.
4. a kind of intelligent substation strange land nuclear-phase method according to claim 1, it is characterised in that：Recorded in step
The measured real time data of reference side be retained as benchmark data, the measured real time data in the side to be measured for being recorded
It is real-time update.
5. a kind of intelligent substation strange land nuclear-phase method according to claim 1, it is characterised in that：In step one, to institute
The analysis of the real time data of collection includes：First by initial data through Fourier transformation, then frequency compensation is carried out, to obtain width
Value, phase place, the exact numerical of frequency.
6. a kind of intelligent substation strange land nuclear-phase method according to claim 1, it is characterised in that：Using sequence number alignment side
Formula compensates the data of measurement error and turns directly to be used by step 3.
7. intelligent substation strange land according to claim 1 nuclear-phase method, it is characterised in that：Reference side and the quilt of side to be measured
Measurement is at least one, and one or more of side to be measured measured measured with one or more of reference side can compare.
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| CN106771678B (en) * | 2016-12-14 | 2019-06-11 | 国网江苏省电力有限公司检修分公司 | A kind of phase detecting method and device based on Hilbert-Huang transform and expert system |
| CN108957231B (en) * | 2018-07-17 | 2021-09-14 | 国网辽宁省电力有限公司电力科学研究院 | Distributed system and method for data interaction between host machine and submachine of distributed system |
| CN109254221A (en) * | 2018-11-26 | 2019-01-22 | 南方电网科学研究院有限责任公司 | A kind of 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 |
| 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 |
| CN111913051B (en) * | 2020-05-25 | 2022-01-04 | 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 |
| 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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