CN109193576B - Intelligent substation protection action time delay optimization method and device - Google Patents
Intelligent substation protection action time delay optimization method and device Download PDFInfo
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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
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Abstract
The invention relates to a method and a device for optimizing protection action time delay of an intelligent substation, which comprises the steps of firstly receiving an SV message sent by a merging unit and acquiring rated time delay data in the SV message; the rated delay data is the time difference from the generation moment of the sampling data to the sending moment of the merging unit; then, the ratio of the obtained rated delay data to the time interval of the output point is obtained, and the integral is obtained and is the number of delay points; subtracting the delay point number from the serial number of the sampling data receiving time to obtain the generation time of the sampling data; and finally, using the generation moment of the obtained sampling data for interpolation synchronous calculation. The invention realizes the synchronization of sampling data of different analog quantity channels, finally achieves the purpose of improving the whole group of action time of protection, and meets the requirements of relay protection sensitivity and quick action.
Description
Technical Field
The invention belongs to the technical field of power relay protection, and particularly relates to a method and a device for optimizing protection action time delay of an intelligent substation.
Background
The intelligent substation is an important component in the construction of an intelligent power grid, is one of important platforms for realizing the conversion and control of various energy sources, and is a key part for realizing the access of various new energy sources to the power grid after power generation. The intelligent substation not only can realize the requirements of intelligent power grid informatization, automation and interaction well in technology and function, but also links up six key links of the intelligent power grid: power generation, power transmission, power transformation, power distribution, power utilization and scheduling.
The relay protection is used as a first safety line of the power system, plays a very important role in ensuring the safe operation of the system, and makes an important contribution to the safe operation of the system when the system fails. According to the important function and technical characteristics of relay protection in a system, four requirements are provided for the relay protection: reliability, selectivity, sensitivity and speed.
Compared with the conventional transformer substation, the analog quantity acquisition link and the export link of the intelligent transformer substation relay protection device are transferred to the merging unit and the intelligent terminal to be completed, the intermediate processing link is added, and the action speed of the whole set of protection device is theoretically slower than that of the conventional transformer substation under the condition that the protection principle is unchanged. For example, for the time from the occurrence of a fault to the transmission of a protection action signal to a switch trip coil, the protection action time delay of a conventional substation is the action time of a protection device, and the intelligent substation is additionally provided with a merging unit and an intelligent terminal, and the protection action time delay comprises merging unit sampling time, protection device action time and intelligent terminal action time, so that the action speed of the whole group of the intelligent substation is undoubtedly slower than that of the conventional substation.
Disclosure of Invention
The invention aims to provide an intelligent substation protection action time delay optimization method and device, which are used for solving the problem that the whole group of action time of an intelligent substation is slower than that of a traditional substation.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention provides an intelligent substation protection action time delay optimization method, which comprises the following steps:
1) receiving an SV message sent by a merging unit, and acquiring rated delay data in the SV message; the rated delay data is the time difference from the generation moment of the sampling data to the sending moment of the merging unit;
2) calculating the ratio of the obtained rated delay data to the time interval of the output point, and rounding to obtain an integer which is the number of delay points;
3) subtracting the delay point number from the serial number of the sampling data receiving time to obtain the generation time of the sampling data;
4) and using the generation time of the obtained sampling data for interpolation synchronous calculation.
The invention also provides an intelligent substation protection action time delay optimization device, which comprises a processor, wherein the processor is used for executing instructions to realize the following method:
1) receiving an SV message sent by a merging unit, and acquiring rated delay data in the SV message; the rated delay data is the time difference from the generation moment of the sampling data to the sending moment of the merging unit;
2) calculating the ratio of the obtained rated delay data to the time interval of the output point, and rounding to obtain an integer which is the number of delay points;
3) subtracting the delay point number from the serial number of the sampling data receiving time to obtain the generation time of the sampling data;
4) and using the generation time of the obtained sampling data for interpolation synchronous calculation.
The invention has the beneficial effects that:
the invention optimizes the action time of the protection device, calculates the number of delay points through rated delay data to obtain the generation time of sampling data, and then performs interpolation synchronization, realizes the synchronization of sampling data of different analog quantity channels, finally achieves the purpose of improving the whole group of action time of protection, and meets the requirements of relay protection sensitivity and quick action.
As a further improvement of the method and the device, in order to obtain more accurate delay point number, the method further comprises the following steps: correcting the number of delay points to obtain the corrected number of delay points: when the ratio is not an integer, or when the difference between the product of the delay point number and the output point time interval and the maximum delay time is less than a set time threshold, the corrected delay point number is the obtained integer plus 1; otherwise, the corrected delay points are the integer.
As a further improvement of the method and the device, in order to improve the whole group action time of protection and improve the reliability of a tripping outlet, when the protection starting logic condition and the protection action logic condition are simultaneously met, a protection action command is controlled and output.
As a further improvement of the device, in order to realize data interaction with the merging unit and the intelligent terminal, the device comprises two interfaces, wherein one interface is connected with the merging unit, and the other interface is connected with the intelligent terminal.
Drawings
FIG. 1 is a schematic diagram of the secondary circuit wiring of the protection device of the present invention;
fig. 2 is a schematic diagram of the outlet loop of the intelligent terminal of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
Method embodiment
The method is mainly applied to a protection device and a process layer device of an intelligent power grid, and a schematic wiring diagram of a secondary circuit of the protection device is shown in figure 1. Optical fiber point-to-point sampling is adopted between the protection device and the merging unit, and a communication protocol adopts DL/T860.92; and the protection device and the intelligent terminal adopt optical fiber point-to-point tripping, and a communication protocol adopts DL/T860.81.
The whole process is as follows: sampling data such as voltage, current and the like in a line are collected by a sampling loop in the merging unit, the sampling data are framed according to a standard SV message format and then sent to a protection device through an optical fiber, the protection device analyzes the SV message to obtain the sampling data, the sampling data are analyzed to carry out protection starting logic judgment and protection action logic judgment, and a judgment result is framed according to a standard GOOSE message format and then sent to an intelligent terminal through the optical fiber.
The whole group of protection action time is improved by optimizing the sampling time of the merging unit, the action time of the protection device and the action time of the intelligent terminal, so that the whole group of protection action time is improved, and the requirements of relay protection on sensitivity and speed are met.
1. Merging unit sample time
The electronic transformer converts the primary voltage and current into digital quantity, and the digital quantity is connected to the merging unit through the optical fiber. The merging unit shown in fig. 1 is provided with a protection loop and a measurement loop (not shown in fig. 1), the sampling loop of the merging unit performs digital filtering by setting different resistance and capacitance parameters, that is, the original filtering manner by a filtering algorithm is adjusted to be filtering by a filtering circuit, and the merging unit separates the low-pass filtering cutoff frequency of the protection loop from the low-pass filtering cutoff frequency of the measurement loop to reduce the time delay of a protection data processing link.
Because the protection device only needs fundamental wave and 2, 3 and 5 harmonics, the sampling cut-off frequency of the protection loop is set to 400Hz, and the hardware filtering loop directly filters the harmonics above 8 times; the measurement and control device is required to be capable of measuring 13-th harmonic, so that the sampling cut-off frequency of the measurement loop needs to be set to be more than 600 Hz. Because the sampling frequency of the protection device is set to be 24 points/week, according to the sampling theorem, the sampling frequency of the protection loop cannot exceed 600Hz, otherwise, frequency aliasing is caused, and the time delay of the data processing link of the software filtering of the protection device can be reduced by setting the sampling cut-off frequency of the protection loop to be 400 Hz. The protection cut-off frequency is set to 400Hz, and the filter loop transfer function is:
wherein, R is 1k omega, and C is 10 nF.
Moreover, a GBit bidirectional high-speed DMA channel is adopted between the FPGA and the CPU in the merging unit, so that the residence time delay of the sampling data in the FPGA and the CPU and the SV message sending time delay are shortened. The merging unit synchronizes and merges the multiple paths of digital signals to form a group of digital signals, and the digital signals are directly sent to the protection device through the optical fiber. The FPGA and CPU mentioned in this paragraph are those in the merge unit.
2. Time of operation of the protection device
The protection device is internally provided with a process layer processing module and a logic protection processing unit, both of which are not shown in fig. 1. The logic protection processing unit comprises a protection action CPU and a protection starting CPU, a protection starting bit is added in a GOOSE outlet message, and the protection starting CPU sends a protection starting message to the intelligent terminal when the protection starting logic is met; and adding a protection action bit in the GOOSE outlet message, and sending a protection action message to the intelligent terminal by a protection action CPU when the protection action logic is met.
The process layer processing module adopts a dual-core processor, wherein the core 1 is responsible for the receiving and processing of SV messages, and the core 2 is responsible for the export processing of GOOSE messages. Sampling data is resampled by a core 1, the sampling data of SV of 80 points/week is subjected to interpolation synchronization according to rated delay data to be changed into sampling data of 24 points/week and is quickly uploaded to a protection logic processing unit, and a GOOSE tripping command sent by the protection logic processing unit after protection starting logic judgment and protection action logic judgment is uploaded to an intelligent terminal through a core 2.
The first channel in the SV message sent by the merging unit is fixed as rated delay data, wherein the rated delay data is the time difference from the generation moment of the sampling data to the sending moment of the merging unit and comprises the total time of the processing of the sampling data in the acquisition link and the data synchronization processing of the merging unit.
The process layer processing module acquires rated delay data in the SV message sent by the merging unit in real time, and calculates the number of points needing delay according to the rated delay data acquired in real time, wherein the calculation formula is as follows: the number of delay points is the rated delay data/output point time interval. The number of delay points is an integer rounded. If the operation result has a remainder, the delay point number is equal to the delay point number + 1; if the delay point number is output point time interval-maximum delay time <100 mus, the delay point number is equal to the delay point number + 1. The two conditions are in an or relationship, that is, as long as one condition is satisfied, the delay point number is added by 1 to correct the delay point number. Only when both conditions are not met, the delay point number is not updated and is an integer obtained by initial calculation.
The purpose of calculating the required delay points is to synchronize interpolation, the process layer processing module synchronizes according to the serial number of the sampling point, and the protection device subtracts the front-end delay points from the serial number of the sampling data receiving time to obtain the generation time of the sampling data after receiving the sampling data sent by the merging unit. The time when the sampling data of different analog quantity channels are generated is the same, so that the synchronization of the sampling data of different analog quantity channels is realized.
The process layer processing module reduces the time of sending the sampling data to the protection starting CPU and the protection action CPU by acquiring the rated delay data in the SV message sent by the merging unit in real time, and improves the protection action speed.
3. Intelligent terminal action time
The intelligent terminal also comprises the FPGA and the CPU, the FPGA adopts a GBit high-speed bidirectional channel, and the GOOSE message filtered by the FPGA is directly written into the memory of the CPU, so that the residence time of the GOOSE message in the CPU plug-in is shortened. The FPGA and the CPU mentioned in this paragraph are those in the intelligent terminal.
The intelligent terminal respectively controls the starting relay and the outlet relay through two completely independent hardware loops, and the condition that the misoperation of the device is caused due to the damage of any component of a CPU or an FPGA is prevented. As shown in fig. 2, the control circuit is provided with a secondary side of the start relay QD and a secondary side of the exit relay CK in series. After receiving a 'protection start' GOOSE command, the intelligent terminal starts the primary side conduction of the relay QD and then starts the secondary side conduction of the relay QD; after the intelligent terminal receives the 'protection action' GOOSE command, the primary side of the outlet relay CK is conducted, and then the secondary side of the outlet relay CK is conducted. The outlet contact can only be closed when the starter relay QD and the outlet relay CK are actuated simultaneously.
The QD of the starting relay directly adopts a MOSFET field effect transistor, and has the advantages of high switching speed (typical action time is 0.5ms), no secondary breakdown, pure resistance when being conducted and the like.
In the method, the fixed value of the protection starting element is defaulted to be 0.95 times of the fixed value of the protection action element, and the high sensitivity of the protection starting logic compared with the protection action logic is ensured, so that the intelligent terminal can start the starting relay QD in advance after receiving the protection starting message, the whole group action time of protection tripping is reduced, and the reliability and the stability of the power system are improved.
Device embodiment
The invention also provides a device for optimizing the protection action delay of the intelligent substation, which is actually a computer or other equipment with data processing capability, and the equipment comprises a processor, wherein the processor can be a general processor, a digital signal processor, an application specific integrated circuit and the like, and is used for executing instructions to realize the method for optimizing the protection action delay of the intelligent substation.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (3)
1. An intelligent substation protection action time delay optimization method is characterized by comprising the following steps:
1) receiving an SV message sent by a merging unit, and acquiring rated delay data in the SV message; the rated delay data is the time difference from the generation moment of the sampling data to the sending moment of the merging unit;
2) calculating the ratio of the obtained rated delay data to the time interval of the output point, and rounding to obtain an integer which is the number of delay points;
3) subtracting the delay point number from the serial number of the sampling data receiving time to obtain the generation time of the sampling data;
4) using the generation time of the obtained sampling data for interpolation synchronous calculation;
in step 2), the method further comprises the following steps: correcting the number of delay points to obtain the corrected number of delay points:
when the ratio is not an integer, or when the difference between the product of the delay point number and the output point time interval and the maximum delay time is less than a set time threshold, the corrected delay point number is the obtained integer plus 1;
otherwise, the corrected delay points are the integer.
2. The intelligent substation protection action time delay optimization device is characterized by comprising a processor, wherein the processor is used for executing instructions to realize the following method:
1) receiving an SV message sent by a merging unit, and acquiring rated delay data in the SV message; the rated delay data is the time difference from the generation moment of the sampling data to the sending moment of the merging unit;
2) calculating the ratio of the obtained rated delay data to the time interval of the output point, and rounding to obtain an integer which is the number of delay points;
3) subtracting the delay point number from the serial number of the sampling data receiving time to obtain the generation time of the sampling data;
4) using the generation time of the obtained sampling data for interpolation synchronous calculation;
in step 2), the method further comprises the following steps: correcting the number of delay points to obtain the corrected number of delay points:
when the ratio is not an integer, or when the difference between the product of the delay point number and the output point time interval and the maximum delay time is less than a set time threshold, the corrected delay point number is the obtained integer plus 1;
otherwise, the corrected delay points are the integer.
3. The intelligent substation protection action delay optimization device of claim 2, comprising two interfaces, wherein one interface is connected with the merging unit, and the other interface is connected with the intelligent terminal.
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| CN113010532B (en) * | 2021-02-26 | 2024-02-13 | 许继集团有限公司 | Relay protection device and SV direct sampling resampling method |
| CN113364846B (en) * | 2021-05-31 | 2022-07-08 | 之江实验室 | Data synchronization method and device for adaptively processing network delay jitter |
| 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 |
| CN114362373B (en) * | 2022-01-14 | 2024-03-19 | 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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| CN103117599B (en) * | 2013-02-04 | 2015-03-25 | 南京南瑞继保电气有限公司 | Intelligent transformer substation link redundancy sampling value online seamless switching method |
| CN103236893A (en) * | 2013-03-22 | 2013-08-07 | 南京南瑞继保电气有限公司 | Network message synchronizing method for process levels of intelligent substation |
| CN104135066B (en) * | 2014-04-09 | 2017-04-12 | 国电南瑞科技股份有限公司 | Intelligent substation system |
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