CN109193576A - A kind of intelligent substation protection act time delay optimization method and device - Google Patents
A kind of intelligent substation protection act time delay optimization method and device Download PDFInfo
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- CN109193576A CN109193576A CN201811039676.6A CN201811039676A CN109193576A CN 109193576 A CN109193576 A CN 109193576A CN 201811039676 A CN201811039676 A CN 201811039676A CN 109193576 A CN109193576 A CN 109193576A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
Abstract
The present invention relates to a kind of intelligent substation protection act time delay optimization method and devices, first the SV message of reception combining unit transmission, and obtain the specified delay data in SV message；Wherein, the specified delay data is time difference of the sampled data generation moment to combining unit sending instant；Then the ratio of the specified delay data obtained and output point time interval is sought, and is rounded, obtained integer is delay points；Then the serial number of the sampled data time of reception is subtracted the delay to count, obtains the generation moment of sampled data；The generation moment of obtained sampled data is finally used for the synchronous calculating of interpolation.The present invention realizes the synchronization of different analog quantity channel sampled datas, is finally reached the purpose for promoting the whole group actuation time of protection, meets the requirement of sensitivity of relay protection and quick-action.
Description
Technical field
The invention belongs to electric relay protection technical fields, and in particular to a kind of intelligent substation protection act time delay optimization
Method and device.
Background technique
Intelligent substation is the important component in smart grid construction, it is to realize various energy conversions and control
One of Important Platform, and realize the key component of access power grid after various generations of electricity by new energy.Intelligent substation is not only in technology
It can functionally realize that smart grid is information-based, automates, interactive requirement well, and be connected smart grid six
Key links: power generation, transmission of electricity, power transformation, distribution, electricity consumption and scheduling.
First security perimeter of the relay protection as electric system, to guaranteeing that it is very important that system safety operation plays
Effect, makes significant contribution to system safety operation in system jam.According to the important work of relay protection in systems
With and technical characterstic, four requirements: reliability, selectivity, sensitivity and quick-action are proposed to relay protection.
Compared with traditional substation, the analog acquisition link and export cycles of relay protection device of intelligent substation are transferred
It is completed to combining unit and intelligent terminal, increases intermediate treatment link, protective device is whole in the constant situation of protection philosophy
Group movement speed is theoretically more slack-off than conventional substation.For example, for occurring from failure to protection signal to reach switch jump
The time of brake cable circle, the protection act time delay of conventional substation are the actuation time of protective device itself, intelligent substation due to
Increase two links of combining unit and intelligent terminal, protection act time delay includes that combining unit sampling time, protective device are dynamic
Make time and intelligent terminal actuation time, this undoubtedly makes the whole group movement speed of intelligent substation slower than conventional substation.
Summary of the invention
The purpose of the present invention is to provide a kind of intelligent substation protection act time delay optimization method and devices, to solve
The whole group actuation time of the intelligent substation problem slower than the whole group actuation time of traditional substation.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
The present invention provides a kind of intelligent substation protection act time delay optimization methods, include the following steps:
1) the SV message that combining unit is sent is received, and obtains the specified delay data in SV message；Wherein, described specified
Delay data is time difference of the sampled data generation moment to combining unit sending instant；
2) ratio of the specified delay data obtained and output point time interval is sought, and is rounded, obtained integer is to prolong
When count；
3) serial number of the sampled data time of reception is subtracted the delay to count, obtains the generation moment of sampled data；
4) the generation moment of obtained sampled data is used for the synchronous calculating of interpolation.
The present invention also provides a kind of intelligent substation protection act time delay optimization device, including processor, the processing
Device realizes following method for executing instruction:
1) the SV message that combining unit is sent is received, and obtains the specified delay data in SV message；Wherein, described specified
Delay data is time difference of the sampled data generation moment to combining unit sending instant；
2) ratio of the specified delay data obtained and output point time interval is sought, and is rounded, obtained integer is to prolong
When count；
3) serial number of the sampled data time of reception is subtracted the delay to count, obtains the generation moment of sampled data；
4) the generation moment of obtained sampled data is used for the synchronous calculating of interpolation.
Beneficial effects of the present invention:
The present invention optimizes protective device actuation time, is calculated by specified delay data delay points,
It to obtain the generation moment of sampled data, and then carries out interpolation and synchronizes, realize the same of different analog quantity channel sampled datas
Step is finally reached the purpose for promoting the whole group actuation time of protection, meets the requirement of sensitivity of relay protection and quick-action.
As the further improvement of method and device, more accurate delay is counted in order to obtain, further includes: to delay point
Number is modified, and obtains revised delay points: when the ratio is not integer, or when delay points are with output point
Between the difference of product and maximum delay time that is spaced when being less than setting time threshold value, revised delay points be obtain it is whole
Number plus 1；Otherwise, revised delay points are the integer.
As the further improvement of method and device, in order to promote the whole group actuation time of protection, tripping outlet is improved
Reliability controls output protection action command when meeting protection starting logical condition and protection act logical condition simultaneously.
As the further improvement of device, in order to realize with the data interaction of combining unit, intelligent terminal, including two connect
Mouthful, one of interface is connected with combining unit, another interface is connected with intelligent terminal.
Detailed description of the invention
Fig. 1 is protective device second loop return wiring schematic diagram of the invention；
Fig. 2 is intelligent terminal outlet loop schematic diagram of the invention.
Specific embodiment
To keep the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, to the present invention
It is described in further detail.
Embodiment of the method
Method of the invention is mainly used in the protective device and process layer device of smart grid, protective device secondary returning
Road wiring schematic diagram is as shown in Figure 1.Using fiber optic point to point sampling between protective device and combining unit, communication protocol is used
DL/T 860.92；The point-to-point tripping of optical fiber is used between protective device and intelligent terminal, communication protocol uses DL/T 860.81.
Its whole process is as follows: sampling circuit in combining unit carries out the sampled datas such as voltage, electric current in route
Acquisition, and sampled data is sent to protective device, protective device solution by optical fiber according to after the SV message format framing of standard
Sampled data is obtained after analysis SV message, analytical sampling data carry out protection starting logic discrimination and protection act logic discrimination, will
Differentiate that result is sent to intelligent terminal by optical fiber according to after the GOOSE message format framing of standard.
Come in terms of optimization combining unit sampling time, protective device actuation time, intelligent terminal actuation time three below
The whole group actuation time of protection is promoted, to promote whole group actuation time of protection, meets relay protection to sensitivity, quick-action
It is required that.
1, the combining unit sampling time
The primary voltage magnitude of current is converted to digital quantity by electronic mutual inductor, through intelligent acess combining unit.It is shown in Fig. 1
Combining unit in be provided with protective loop and measurement circuit (being not drawn into Fig. 1), the sampling circuit of combining unit passes through setting
Different resistance and capacitance parameter carry out digital filtering, i.e., are adjusted to original by way of being filtered filtering algorithm
Be filtered by filter circuit, combining unit by the low-pass filtering cutoff frequency of protective loop and measurement circuit low pass filtered
Wave cutoff frequency separates, to reduce the time delay of protection data processing link.
Since protective device usually only needs fundamental wave and 2,3,5 subharmonic, protective loop samples cutoff frequency setting
For 400Hz, hardware filtering circuit is directly by 8 times or more harmonic filtrations；Measure and control device requires to be capable of measuring 13 subharmonic, therefore measures
Loops sample cutoff frequency need to be set as 600Hz or more.Because the sample frequency of protective device is set as 24 points/week, according to adopting
Sample theorem, otherwise the sample frequency of protective loop will result in frequency aliasing no more than 600Hz, by adopting protective loop
Sample cutoff frequency is set as 400Hz, just can be reduced the time delay of protective device software filtering data processing link.Protect cutoff frequency
It is set as 400Hz, filter circuit transmission function are as follows:
Wherein, R=1k Ω, C=10nF.
Moreover, GBit bidirectional high speed DMA channel is used between FPGA and CPU in combining unit, to shorten sampled data
Resident time delay, SV message transmitting time delay inside FPGA and CPU.Combining unit is synchronous by multi-path digital signal and merges, group
It synthesizes set of number signal and is transmitted directly to protective device through optical fiber.The FPGA and CPU mentioned in the paragraph is in combining unit
FPGA and CPU.
2, protective device actuation time
Protective device is internally provided with process layer processing module and virtual protection processing unit, and the two is not all drawn in Fig. 1
Out.Virtual protection processing unit includes protection act CPU and protection starting CPU, and " protection is opened for increase in the outlet GOOSE message
It is dynamic " position, protection starting CPU sends " protection starting " message to intelligent terminal when meeting protection starting logic；It exports and reports in GOOSE
Increase " protection act " position in text, it is whole to intelligence to send " protection act " message by protection act CPU when meeting protection act logic
End.
Process layer processing module uses dual core processor, and core 1 is responsible for the reception processing of SV message, and core 2 is responsible for GOOSE message
Outlet processing.Sampled data is same according to specified delay data progress interpolation by 80 points/week SV sampled data through 1 resampling of core
Become after step 24 points/week sampled data, and rapidly on give relay protective scheme processing unit, relay protective scheme processing unit is through protecting
The GOOSE trip signal issued after starting logic discrimination and protection act logic discrimination is through core 2 is by " protection act " and " protection is opened
It is dynamic " intelligent terminal is given on signal.
First channel in SV message that combining unit is sent is fixed as specified delay data, specified delay number here
According to for sampled data generate the moment arrive combining unit sending instant time difference, comprising sampled data acquisition link processing with
The total time of combining unit progress data synchronization processing.
Process layer processing module obtains the specified delay data in the SV message of combining unit transmission in real time, and foundation obtains in real time
The specified delay data taken calculates the points for needing to be delayed, calculation formula are as follows: when delay points=specified delay data/output point
Between be spaced.Here the integer that delay points obtain for rounding.Moreover, if operation result there are remainder, the points that are delayed=
Delay points+1；If delay points * output point time interval-maximum delay < 100 μ s, the points that are delayed=delay points+1.
Here two conditions be or relationship, as long as that is, meet a condition, delay points plus 1, with to delay count into
Row amendment.Only when two conditions are all unsatisfactory for, delay points do not update, the integer obtained for first calculated.
The purpose for calculating the delay points needed is in order to which interpolation is synchronous, and process layer processing module is carried out by sampled point serial number
It is synchronous, after protective device receives the sampled data of combining unit transmission, the serial number of the sampled data time of reception is subtracted into front end and is prolonged
When points after be exactly sampled data the generation moment.Different analog quantity channel sampled datas generate at the time of be it is identical, in this way
It is achieved that the synchronization of different analog quantity channel sampled datas.
Process layer processing module is adopted by obtaining the specified delay data in the SV message that combining unit is sent, reduction in real time
Sample data are sent to the time of protection starting CPU and protection act CPU, improve protection act speed.
3, intelligent terminal actuation time
It equally include FPGA and CPU in intelligent terminal, FPGA uses GBit high-speed bidirectional channel, filtered through FPGA
GOOSE message is write direct in the memory of CPU, and residence time of the GOOSE message in CPU card is shortened.It is mentioned in the paragraph
FPGA and CPU be intelligent terminal in FPGA and CPU.
Intelligent terminal controls starting relay and exit relay by two completely self-contained hardware-in-the-loops respectively, prevents
The case where any component damage of CPU or FPGA causes error action of device to be made appearance.It is opened as shown in Fig. 2, going here and there to be equipped in control loop
Motor type relay QD it is secondary while and exit relay CK it is secondary while.Intelligent terminal starts after receiving " protection starting " GOOSE order
The primary side of relay QD is connected, then the secondary side conducting of starting relay QD；Intelligent terminal receives " protection act " GOOSE life
The primary side conducting of exit relay CK after order, the then secondary side conducting of exit relay CK.Only as starting relay QD and out
Outlet junctions could be closed when mouth relay CK simultaneously operation.
Wherein, starting relay QD directlys adopt MOSFET field-effect tube, and having switching speed, fast (the typical action time is
0.5ms), the advantages that without second breakdown and conducting in purely resistive.
In this method, protection starting element definite value is defaulted as 0.95 times of protection act element definite value, it is ensured that protection starting
Logic than protection act logic high sensitivity so that intelligent terminal can be opened in advance after receiving " protection starting " message
Starting relay QD reduces the whole group actuation time of trip protection, improves the reliability and stability of electric system.
Installation practice
The present invention also provides a kind of intelligent substation protection act time delay optimization devices, which is actually computer
Equipment etc. having data-handling capacity, the equipment include processor, which can be general processor, can also be several
Word signal processor, specific integrated circuit etc., which, which is used to execute instruction, realizes that intelligent substation protection of the invention is dynamic
Make time delay optimization method, the method that specific method is shown in above-mentioned introduction, which is not described herein again.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (7)
1. a kind of intelligent substation protection act time delay optimization method, which comprises the steps of:
1) the SV message that combining unit is sent is received, and obtains the specified delay data in SV message；Wherein, the specified delay
Data are time difference of the sampled data generation moment to combining unit sending instant；
2) ratio of the specified delay data obtained and output point time interval is sought, and is rounded, obtained integer is delay point
Number；
3) serial number of the sampled data time of reception is subtracted the delay to count, obtains the generation moment of sampled data；
4) the generation moment of obtained sampled data is used for the synchronous calculating of interpolation.
2. intelligent substation protection act time delay optimization method according to claim 1, which is characterized in that in step 2),
Further include: delay points are modified, revised delay points are obtained:
When the ratio is not integer, or when delay points and the product of output point time interval and maximum delay time
When difference is less than setting time threshold value, revised delay points add 1 for obtained integer；
Otherwise, revised delay points are the integer.
3. intelligent substation protection act time delay optimization method according to claim 1, which is characterized in that meet when simultaneously
When protection starting logical condition and protection act logical condition, output protection action command is controlled.
4. a kind of intelligent substation protection act time delay optimization device, which is characterized in that including processor, the processor is used for
It executes instruction and realizes following method:
1) the SV message that combining unit is sent is received, and obtains the specified delay data in SV message；Wherein, the specified delay
Data are time difference of the sampled data generation moment to combining unit sending instant；
2) ratio of the specified delay data obtained and output point time interval is sought, and is rounded, obtained integer is delay point
Number；
3) serial number of the sampled data time of reception is subtracted the delay to count, obtains the generation moment of sampled data；
4) the generation moment of obtained sampled data is used for the synchronous calculating of interpolation.
5. intelligent substation protection act time delay optimization device according to claim 4, which is characterized in that in step 2),
Further include: delay points are modified, revised delay points are obtained:
When the ratio is not integer, or when delay points and the product of output point time interval and maximum delay time
When difference is less than setting time threshold value, revised delay points add 1 for obtained integer；
Otherwise, revised delay points are the integer.
6. intelligent substation protection act time delay optimization device according to claim 4, which is characterized in that meet when simultaneously
When protection starting logical condition and protection act logical condition, output protection action command is controlled.
7. intelligent substation protection act time delay optimization device according to claim 4, which is characterized in that connect including two
Mouthful, one of interface is connected with combining unit, another interface is connected with intelligent terminal.
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| CN113364846A (en) * | 2021-05-31 | 2021-09-07 | 之江实验室 | Data synchronization method and device for adaptively processing network delay jitter |
| CN114172628A (en) * | 2021-12-14 | 2022-03-11 | 上海乐耘电气技术有限公司 | Synchronous acquisition method of process layer network sampling data independent of time synchronization |
| CN114362373A (en) * | 2022-01-14 | 2022-04-15 | 南京国电南自电网自动化有限公司 | Intelligent substation sampling self-adaptive synchronization method and system |
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Cited By (8)
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| CN113010532A (en) * | 2021-02-26 | 2021-06-22 | 许继集团有限公司 | Relay protection device and SV direct mining resampling method |
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| CN113364846A (en) * | 2021-05-31 | 2021-09-07 | 之江实验室 | Data synchronization method and device for adaptively processing network delay jitter |
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| CN114172628B (en) * | 2021-12-14 | 2024-04-09 | 上海乐耘电气技术有限公司 | Synchronous acquisition method of process layer network sampling data independent of time synchronization |
| CN114362373A (en) * | 2022-01-14 | 2022-04-15 | 南京国电南自电网自动化有限公司 | Intelligent substation sampling self-adaptive synchronization method and system |
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