CN104966155B - Consider the intelligent substation of compensation of delay characteristic across the synchronous Wave record method of interval combining unit MU - Google Patents
Consider the intelligent substation of compensation of delay characteristic across the synchronous Wave record method of interval combining unit MU Download PDFInfo
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Abstract
The invention discloses a kind of intelligent substations for considering compensation of delay characteristic across the synchronous Wave record method of interval MU, the wave-record chart of fault oscillograph is interpolated treated information in intelligent substation at present, rather than original signal, there is a problem of that Fault Recorder Information is not stringent accurate in practical applications.The present invention is on the basis of considering different interval combining unit inherent delay, the main channel MU is chosen as reference, further amendment realizes the accurate extraction of primary fault information across interval MU communication channel delay compensation, is conducive to the efficiency and accuracy that improve accident analysis.Simultaneously, propose a kind of fault wave recording device recording profile value amending method of consideration time-delay characteristics compensation, it does not influence subsequent calculating analysis on the basis of retaining original wave-record chart, compensates for the deficiency of existing recording mode, there is positive reference significance to smart grid security stable operation.
Description
Technical field
The present invention relates to a kind of intelligent substations for considering compensation of delay characteristic across the synchronous Wave record method of interval MU, belongs to intelligence
It can substation relay protection and field of automation technology.
Background technique
In intelligent substation, the fault oscillograph that " point-to-point " directly adopts mode is directly received from different interval combining unit
(MU) sample information.The sampled data being respectively spaced due to usually containing route, main transformer, breaker, bus etc. in fault oscillograph,
Thus no matter it analyzes development electric network fault analysis under grid operating conditions or failure situations in the steady state and all has important ginseng
The effect of examining.
Currently, intelligent substation mostly uses greatly the sampling configuration of " conventional electrical formula mutual inductor+combining unit ", for point pair
Point receives for the fault oscillograph across interval MU sampling, since the sampling instant of different interval combining unit is different, specified prolongs
When it is also not exactly the same, obtain sampled data simultaneously it is asynchronous.In order to obtain synchronous electric current, voltage data, failure wave-recording
Device must SV data to multiple intervals carry out interpolation resampling, detailed process are as follows: fault oscillograph receives each combining unit SV
When message, the accurate arrival time of each message is recorded, and analyzes the specified delayed data of SV message；Fault oscillograph is based on report
Literary arrival time, and after compensating specified delay, by SV data convert to real sampling instant, then according to thus record adopting again for itself
Sample pulse carries out interpolation to all channels simultaneously, obtains based on therefore record the analog value of itself sampling pulse, channels all in this way
New data value is the analog quantity of synchronization, is synchronous.After fault oscillograph interpolation resampling, each channel data is to synchronize
Data, but the waveform that method is recorded accordingly is not original waveform, but the waveform after interpolation resampling, there are certain
Phase error and amplitude error will lead to the loss of original wave-record chart using such way, and then may influence failure
Analysis, and with the difference of interpolation algorithm, influence degree is also different, this allows for fault oscillograph third party's public credibility drop
It is low.
Summary of the invention
In order to solve the problems in the prior art, the present invention provides a kind of intelligent substations for considering compensation of delay characteristic
Across the synchronous Wave record method of interval MU, can make up fault oscillograph recorded wave file authentic and valid can not obtain each interval actual samples
The problem of value, effectively promotes the efficiency and accuracy of accident analysis, and it is horizontal to help to improve power grid security reliability service.
To solve the above-mentioned problems, the technical solution used in the present invention is:
Consider the intelligent substation of compensation of delay characteristic across the synchronous Wave record method of interval MU, it is characterised in that: including following
Step:
(1), it is all made of in the recorded wave file of protective device and fault oscillograph and meets the COMTRADE format of ieee standard
File, the COMTRADE formatted file includes configuration file, and the configuration file includes Skew field configuration information, is utilized
SkewnStart inherent delay delay existing for rear each interval combining unit sampled value sampling period to recordn；
(2), a certain channel MU is as reference data in selection recorded wave file, by the SV message arrival time in remaining channel MU
It is compared, obtains delay time and is compensated with the channel benchmark MU, after failure wave-recording starting, fault wave recording device will be remembered
The absolute time that the channel benchmark MU first point of SV message reaches is recorded, if it is Tmain, remaining interval combining unit SV message arrives
Initial time up to fault oscillograph is denoted as T respectively1、T2….Tn；
(3), across septal pathways compensation of delay correction values are calculated, each communication channel delay compensating approach value for being spaced combining unit is answered
Setting are as follows:
(4), it calculates and modifies recording configuration file corresponding channel Skew value, in the configuration file of failure wave-recording, Ying Jiang
The Skew in the channel benchmark MUmainValue is set as the inherent delay delay of the combining unitmain, and the Skew in remaining channel MUnValue
It should be set as
Skewn=delayn-revn(n=1,2,3...) (2)
It is wherein the Skew value that combining unit n includes all sampling channels, right side delay on the left of (2) formulanIt represents and merges list
The inherent delay of first n, revnDefinition such as formula (1) shown in.
The intelligent substation of aforementioned consideration compensation of delay characteristic is across the synchronous Wave record method of interval MU, it is characterised in that: step
Suddenly it in (3), since transient state recording process time is shorter, usually can be completed in several seconds, it is believed that different combining unit SV
Transmission interval will not change, it is logical need to only to record first point of each channel MU and benchmark after the starting of fault oscillograph recording in this way
Relative time between first point of road, the rev value complement that can be completed in formula (1) are repaid.
Advantageous effects of the invention: the present invention is on the basis of considering different interval combining unit inherent delay,
The main channel MU is chosen as reference, further amendment realizes primary fault information across interval MU communication channel delay compensation
It is accurate to extract, be conducive to the efficiency and accuracy that improve accident analysis.Meanwhile proposing a kind of event of consideration time-delay characteristics compensation
Hinder wave recording device recording configuration file Skew value amending method, does not influence subsequent calculating on the basis of retaining original wave-record chart
Analysis, compensates for the deficiency of existing recording mode, has positive reference significance to smart grid security stable operation.
Detailed description of the invention
Fig. 1 is certain 220kV substation fault oscillograph recording profile information schematic diagram.
Fig. 2 is different interval combining unit communication channel delay compensating approach schematic diagram of the present invention.
Fig. 3 is present invention consideration compensation of delay characteristic across the synchronous Wave record method flow chart of interval MU
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
Technical solution of the present invention research is carried out based on electrical power system transient data exchange shared format.Currently, protective device
It is all made of the COMTRADE format for meeting ieee standard, with the recorded wave file of fault oscillograph to realize that different manufacturers set
Exchange between standby data.Each COMTRADE record contains up to four relevant files.The filename of these files is identical,
But extension name is different.Four files are heading file (.hdr), configuration file (.cfg), data file (.dat) and letter respectively
It ceases file (.inf).Wherein, data file (.dat) includes the analog quantity and digital quantity value of all input channels in record, and matches
File is set then to annotate the various information including data (.dat) the file information, such as protective device title, sampling speed
The contents such as rate, number of channels, frequency, channel information.As shown in Figure 1, being that certain 220kV substation fault oscillograph recording is matched
Set the partial information in file (.cfg):
Each row, which respectively arranges, in configuration information in Fig. 1 follows electrical power system transient data exchange shared format requirement.Wherein
Grey one is classified as the Skew field in configuration information, to record the channel time lag after starting sampling period, it is possible to provide at one
The information of the time difference, utilizes Skew in this way between the internal channel sampling period sampling of recordnStart sampling period afterwards respectively to record
It is spaced inherent delay delay existing for combining unit sampled valuen；
The present invention considers the intelligent substation of compensation of delay characteristic across the synchronous Wave record method of interval MU, comprising the following steps:
As shown in figure 3, considering the intelligent substation of compensation of delay characteristic across the synchronous recording technology in interval combining unit (MU)
Implementation method:
1), across the interval specified compensation of delay of combining unit
Since the specified delay of different combining units is not exactly the same, fault oscillograph directly adopts each interval combining unit sampling
There are inherent delay delay for value.For this case, the configuration of fault oscillograph recording can be modified according to different interval delayed data
Skew field contents in file (.cfg), so that each circuit-switched data for reaching fault wave recording device is initial AC sampling
Value.
2), the MU channel compensation of fault wave recording device
It should be noted that being stored in recording configuration file using by the inherent delay delay data of different combining units
The mode that the Skew field of (.cfg) is compensated not is obtained with the primary data information (pdi) of fault wave recording device sampling,
This is because the temporal that the SV message of different interval combining unit reaches fault oscillograph there is difference.Therefore, it also needs
Delay value is corrected.For specific combining unit, the SV message it includes each paths information is a certain true
Timing is carved into up to fault wave recording device, therefore compensation technique here is substantially to different interval combining unit SV message
Compensation of delay technology.
The a certain channel MU is as reference data in present invention selection recorded wave file, when the SV message in remaining channel MU is reached
Between be compared with the channel benchmark MU, obtain delay time simultaneously be compensated.In normal state, fault wave recording device is normally adopted
Sample.After failure wave-recording starting, reached as shown in Fig. 2, fault wave recording device will record first point of the channel benchmark MU SV message
Absolute time, if its be Tmain, remaining interval combining unit SV message reach fault oscillograph initial time be denoted as respectively
T1、T2….Tn,
From Figure 2 it can be seen that respectively the communication channel delay compensating approach value of interval combining unit should be arranged are as follows:
Synthesis is 1) and 2) partial content should be by the channel benchmark MU in the configuration file (.cfg) of failure wave-recording
SkewmainValue is set as the inherent delay delay of the combining unitmain, and the Skew of rest channelsnValue should be set as
Skewn=delayn-revn(n=1,2,3...) (2)
It is wherein the Skew value that combining unit n includes all sampling channels, right side delay on the left of equationnIt represents and merges list
The inherent delay of first n, revnDefinition such as formula (1) shown in.
It should be noted that the delay value in each channel MU only needs to record once, this is because transient state in the present invention
Recording process time is shorter, and being generally up to about can be completed in several seconds, and during this period of time we can consider different conjunctions completely
And the transmission interval of cell S V will not change.Therefore, each channel MU first after fault oscillograph recording starts need to only be recorded
Relative time between point and first point of reference channel, the rev value complement that can be completed in formula (1) are repaid.
Method of the invention can obtain the recorded wave file comprising the different channels MU initial data in fault wave recording device,
The accuracy of wave-record chart is ensured completely.And in subsequent analysis calculating, due to the Skew in recording configuration file (.cfg)
Field has had recorded the delay state of corresponding channel, can pass through interpolation or other methods of synchronization again, obtains synchronism output
Recorded wave file, further carry out corresponding analysis work.
Basic principles and main features and advantage of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (2)
1. considering the intelligent substation of compensation of delay characteristic across the synchronous Wave record method of interval combining unit MU, it is characterised in that: packet
Include following steps:
(1), it is all made of in the recorded wave file of protective device and fault oscillograph and meets the COMTRADE formatted file of ieee standard,
The COMTRADE formatted file includes configuration file, and the configuration file includes Skew field configuration information, utilizes SkewnWith
Start inherent delay delay existing for rear each interval combining unit sampled value sampling period to recordn；
(2), a certain channel MU is as reference data in selection recorded wave file, by the SV message arrival time in remaining channel MU and base
The quasi- channel MU is compared, and obtains delay time and is compensated, and after failure wave-recording starting, fault wave recording device will record base
The absolute time that first point of the quasi- channel MU SV message reaches, if it is Tmain, the arrival event of remaining interval combining unit SV message
The initial time of barrier oscillograph is denoted as T respectively1、T2….Tn；
(3), across septal pathways compensation of delay correction values are calculated, each communication channel delay compensating approach value for being spaced combining unit should be arranged
Are as follows:
(4), calculating and modify recording configuration file corresponding channel Skew value should be by benchmark in the configuration file of failure wave-recording
The Skew in the channel MUmainValue is set as choosing the inherent delay delay of the combining unit as reference datamain, and remaining MU is logical
The Skew in roadnValue should be set as
Skewn=delayn-revn, n=1,2,3... (2)
It is wherein the Skew value that combining unit n includes all sampling channels, right side delay on the left of (2) formulanRepresent combining unit n's
Inherent delay, revnDefinition such as formula (1) shown in.
2. the intelligent substation according to claim 1 for considering compensation of delay characteristic is across the synchronous recording of interval combining unit MU
Method, it is characterised in that: in step (3), since transient state recording process time is shorter, usually it can be completed in several seconds, it can be with
Think that the transmission interval of different combining unit SV will not change, need to only record each MU after the starting of fault oscillograph recording in this way
Relative time between first point of channel and first point of reference channel, the rev value complement that can be completed in formula (1) are repaid.
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| CN109946513B (en) * | 2019-03-26 | 2021-01-08 | 江苏凌创电气自动化股份有限公司 | Cross-interval digital metering method, device and system based on network sampling absolute delay compensation |
| CN110535551B (en) * | 2019-09-26 | 2021-07-30 | 南京国电南自电网自动化有限公司 | Method and system for synchronizing fault recording sampling data in power system |
| CN117687347B (en) * | 2024-02-02 | 2024-04-09 | 三峡智控科技有限公司 | Synchronous wave recording method and device based on FPGA and communication network |
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| CN102419589B (en) * | 2011-12-31 | 2014-05-07 | 国家电网公司 | Intelligent power utilization system and method for district |
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