CN114025254B - Synchronous sampling method and system for currents of different branches - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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Abstract
The invention discloses a synchronous sampling method and a synchronous sampling system for different branch currents, wherein the method comprises the following steps: judging whether a communication link is normal or not, wherein the communication link is a communication path between a master node and each slave node; when the communication link is normal, sending synchronous sampling frame instructions to each slave node so as to enable each slave node and the master node to synchronously acquire current data and voltage data; the collected voltage data come from the voltage of the same line, and the synchronous sampling frame instruction is as follows: data acquisition is started at the nth zero crossing. The invention aims to provide a synchronous sampling method and a synchronous sampling system for different branch currents, which can realize quasi-synchronous sampling of different branch currents without increasing extra hardware cost.
Description
Technical Field
The invention relates to the technical field of electric energy metering, in particular to a synchronous sampling method and system for different branch currents.
Background
The electric energy metering is an important component of metering work, is an important link of production, management and safe operation of a power grid of an electric power enterprise, and the technical level and the management level of the electric energy metering are related to development of the electric power industry and the image of the electric power enterprise, influence fairness, accuracy and reliability of electric energy trade settlement and relate to benefits of the electric power enterprise, vast electric power customers and common people. Therefore, the quality management work of the whole life cycle of the electric energy meter is very important.
In view of this, the national market supervision and management bureau proposes to actively change working ideas and continuously perfect the real-time operation monitoring function of the electric energy meter. And each provincial supervision bureau and power grid operation enterprises also sequentially input a large amount of resources to study the operation state of the electric energy meter, especially the error on-line supervision.
Based on the principle of conservation of energy, a mode of collecting total table of a transformer area and electric energy information of each sub-table and introducing error coefficients is proposed, an equation set with total electric quantity equal to the sum of the electric quantities of the sub-tables is constructed, and finally, the errors of each electric energy table are solved by calculating the equation set. However, in practical situations, the loss exists in the circuit and is far higher than the electricity consumption of the household user in general, so that the error estimation of each electric energy meter has larger deviation or the error out-of-tolerance electric energy meter cannot be effectively hit. It should be noted here in particular that the error of an electric energy meter, in particular an error-out-of-tolerance electric energy meter, exceeds a threshold value specified by the country or industry, which value generally does not exceed the accuracy class of the electric energy meter. For example, the error of a 2-stage single-phase electric energy meter should not exceed 2%.
Aiming at the difficulties, students find that the link of the out-of-tolerance metering error performance is mainly concentrated in a current sampling loop through analysis of an abnormal meter. Therefore, the out-of-tolerance meter can be found by collecting the current at high frequency, and the basic principle is that the current instantaneous value on the bus is equal to the sum of the current instantaneous values of all branches at any time, and the implementation path is consistent with the error solving mode based on the energy conservation principle. However, the difficulty of this method is that the synchronicity of current sampling, i.e. the total node current and the node currents of the branches need to be ensured to be sampled synchronously. Limited by the problem of synchronicity, the current alternative solutions mainly employ a hard synchronization approach. The method clearly increases the hardware cost of the equipment and the operation and maintenance workload of the site, and severely restricts the development of the technology.
Disclosure of Invention
The invention aims to provide a synchronous sampling method and a synchronous sampling system for different branch currents, which can realize quasi-synchronous sampling of different branch currents without increasing extra hardware cost.
The invention is realized by the following technical scheme:
in one aspect of the present application, the present application provides a method for synchronous sampling of different branch currents, including the steps of:
judging whether a communication link is normal or not, wherein the communication link is a communication path between a master node and each slave node;
when the communication link is normal, sending synchronous sampling frame instructions to each slave node so as to enable each slave node and the master node to synchronously acquire current data and voltage data;
the collected voltage data come from the voltage of the same line, and the synchronous sampling frame instruction is as follows: data acquisition is started at the nth zero crossing.
Preferably, said determining whether the communication link is normal comprises the sub-steps of:
acquiring a transmission time T 1 The transmission time T 1 A communication link availability confirmation command frame is sent to the slave node for the master node;
acquiring a receiving time T 2 The receiving time T 2 Time of receiving acknowledgement frame sent from slave node for master node；
Calculating the transmission time T 1 And the reception time T 2 Time difference Δt of (2);
when the delta T is<T SET When the communication link is normal, wherein T SET Is a threshold value.
Preferably, the synchronous sampling frame instruction is transmitted in the form of broadcasting.
Preferably, the following steps are also included:
after the data acquisition of the designated length is completed, receiving first acquired data returned from each slave node, wherein the first acquired data comprises current data and voltage data;
and automatically aligning the acquired data, wherein the acquired data comprises first acquired data and second acquired data, and the second acquired data is current data and voltage data acquired by the main node.
Preferably, the automatic alignment of the acquired data comprises the following sub-steps:
obtaining an alignment reference node and a non-reference node, wherein the alignment reference node is: all nodes acquire nodes corresponding to maximum voltage data in the first sampling, and the maximum voltage data is larger than 0; the non-reference nodes are nodes except the alignment reference nodes;
comparing the voltage data acquired by the non-reference nodes with the maximum voltage data in sequence according to the acquisition sequence until the voltage data closest to the maximum voltage data is acquired, and deleting the voltage data and the current data acquired before the corresponding acquisition time of the voltage data;
and sequentially translating the undeleted data to align the data.
In another aspect of the present application, the present application provides a synchronous sampling system for different branch currents, comprising:
the judging module is used for judging whether the communication link is normal or not, wherein the communication link is a communication path between the master node and each slave node;
the sending module is used for sending synchronous sampling frame instructions to each slave node when the communication link is normal so as to enable each slave node and the master node to synchronously perform current data acquisition and voltage data acquisition;
the collected voltage data come from the voltage of the same line, and the synchronous sampling frame instruction is as follows: data acquisition is started at the nth zero crossing.
Preferably, the judging module includes:
a first acquisition unit for acquiring a transmission time T 1 The transmission time T 1 A communication link availability confirmation command frame is sent to the slave node for the master node;
a second acquisition unit for acquiring the receiving time T 2 The receiving time T 2 A time when an acknowledgement frame sent from the slave node is received for the master node;
a calculating unit for calculating the transmission time T 1 And the reception time T 2 Time difference Δt of (2);
a judging unit for judging the time difference DeltaT and the threshold T SET When the delta T is<T SET When the communication link is normal.
Preferably, the synchronous sampling frame instruction is transmitted in the form of broadcasting.
Preferably, the method further comprises:
the receiving module is used for receiving first collected data returned from each slave node when the data collection of the designated length is completed, wherein the first collected data comprises current data and voltage data;
the alignment module is used for automatically aligning the acquired data, wherein the acquired data comprises first acquired data and second acquired data, and the second acquired data is current data and voltage data acquired by the main node.
Preferably, the alignment module includes:
a third obtaining unit, configured to obtain an aligned reference node and a non-reference node, where the aligned reference node is: all nodes acquire nodes corresponding to maximum voltage data in the first sampling, and the maximum voltage data is larger than 0; the non-reference nodes are nodes except the alignment reference nodes;
the processing unit is used for comparing the voltage data acquired by the non-reference nodes with the maximum voltage data in sequence according to the acquisition sequence until the voltage data closest to the maximum voltage data is acquired, and deleting the voltage data and the current data acquired before the corresponding acquisition time of the voltage data;
and the alignment unit is used for sequentially translating the undeleted data to align the data.
Compared with the prior art, the invention has the following advantages and beneficial effects:
quasi-synchronous sampling of different branch currents can be realized without adding extra hardware cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
fig. 1 shows a schematic view of zero crossings.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1
The synchronous sampling method of different branch currents comprises the following steps:
judging whether a communication link is normal or not, wherein the communication link is a communication path between a master node and each slave node;
the master node and the slave node in this embodiment refer to devices with voltage sampling capability, current sampling capability, HPLC communication and voltage zero crossing detection, including but not limited to an electric energy meter, an acquisition terminal, an intelligent circuit breaker, an energy controller and an intelligent fusion terminal. Meanwhile, in order to ensure the synchronous effect, all the collected objects (the master node and the slave nodes) should adopt the same model and the same batch of equipment as much as possible.
Specifically, the method comprises the following steps:
acquiring a transmission time T 1 Transmission time T 1 Transmitting a communication link availability confirmation command frame to the slave node for the master node;
acquiring a receiving time T 2 Time of reception T 2 The time when the master node receives the acknowledgement frame sent by the slave node;
calculating the transmission time T 1 And a reception time T 2 Time difference Δt of (2);
when the time difference is delta T<T SET And if not, the communication link is abnormal. Wherein T is SET For the threshold value, preferably, T is set SET When T should be made SET No greater than the time difference between the occurrence of the two zero crossings.
When the communication link is normal, the master node sends a synchronous sampling frame instruction to each slave node in a broadcast mode so as to enable each slave node and the master node to synchronously perform current data acquisition and voltage data acquisition, wherein the acquired voltage data come from the voltage of the same line, namely: in practice, all the acquired objects (master node and slave node) should share at least one voltage line.
The synchronous sampling frame instruction is as follows: data acquisition is started at the nth zero crossing. Specifically, because the communication links from the master node to the slave nodes are not completely consistent, the time when the slave nodes receive the synchronous sampling frame is not consistent, in order to ensure that all the nodes (the master node and the slave nodes) can synchronously perform data acquisition, a delay with different time length is reserved for each slave node, so that each node can simultaneously acquire data at the Nth zero crossing point after undergoing the delay, namely:
after the master node sends a synchronous sampling frame command, the master node starts to collect the current and the voltage of the master node at the Nth zero crossing point;
the slave node starts to collect the slave node current and the slave node voltage at the nth zero crossing point after receiving the synchronous sampling frame command.
Where N may be determined based on the theoretical time consumption of transmission and reception of the "synchronous sampled frame", when the total time consumption of transmission and reception of the "synchronous sampled frame" is less than the time difference between the occurrences of the two zero crossings, the proposal is set to 2. Other conditions may be determined based on the actual conditions.
Further, in order to minimize the influence caused by the time consumed by sending and receiving the "synchronous sampling frame", in the implementation, the sending time of the "synchronous sampling frame" of the master node may be set as follows: and immediately after detecting the zero crossing point.
The zero crossing point in this embodiment refers to a time point when the voltage changes from negative to positive, as shown in fig. 1.
In this embodiment, since the collected currents come from different branches, there is a large error in the attempt to collect the currents of the different branches synchronously, and therefore, in this application, by providing the same voltages for the different branches, the currents of the different nodes are sampled synchronously with the voltage zero-crossing point as a reference.
Example 2
Because the solution in embodiment 1 has delay, the collected current data has deviation, so that in order to further reduce the deviation and improve the synchronism of the data, the embodiment is optimized on the basis of embodiment 1, and specifically, the implementation further includes the following steps:
after all the nodes complete the data acquisition of the designated length, the master node transmits the data (voltage data and current data) acquired by each slave node back to the master node in an active calling mode; the appointed length can be appointed according to actual needs, and zero crossing points are recommended to be used as ending moments;
carrying out automatic data alignment on the acquired data, wherein the acquired data comprises first acquired data and second acquired data, and the second acquired data is current data and voltage data acquired by a main node, and specifically comprises the following steps:
finding the maximum value among the voltage values obtained by all nodes (including the master node) at the first sampling, which should not beLess than 0, calculated as The node is used as an alignment reference node, and other nodes are non-reference nodes;
for all non-reference nodes, respectively and sequentially mixing the sampled voltage data with the sampling time sequenceComparing until it finds the respective and ++>And stopping the closest value, wherein all the sampling voltage and current data are invalid data before the moment, and deleting all the data. Meanwhile, in order to prevent excessive searching, a searching range can be set as the first K times of sampling data according to actual conditions.
And sequentially complementing the deleted time data until the data are aligned again to the left.
In this embodiment, since all nodes share at least one voltage line, the voltage data collected by each node synchronously should be approximately equal, and based on this, the synchronous current data is obtained by screening the voltage data and taking the time when the voltage data of each node is approximately the same as the synchronous starting point.
For ease of understanding, the following description is given by way of specific examples:
assume that a certain area has 3 electric energy meters, and the sampling data of the electric energy meters are shown in table 1. It should be noted that the data shown in the following table has no actual physical meaning, and is merely used to demonstrate the self-alignment of the data.
Table 1 raw sample data
As can be seen from Table 1, the 1 st samples of the voltage data in tables A, B and C are 0.014, 0.089 and 0.051, respectively, the maximum valuesNamely, table B is a reference node, and tables a and C are non-reference nodes;
from the voltage data collected in Table A, find the first and second according to the time sequence of collectionThe nearest sampling time can be known that the table A is the 4 th sampling data, so the 1 st, 2 nd and 3 rd sampling data of the table A are deleted, as shown in the table 2;
from the voltage data collected in Table C, find the first and second according to the time sequence of collectionThe nearest sampling time can be known that the table C is the 2 nd sampling data, so the 1 st sampling data of the table C is deleted, as shown in table 2;
table 2 deleted sample data
For the deleted time data, the steps are sequentially iterated until and the data is realigned left as shown in table 3.
Table 3 sample data after alignment
Example 3
The embodiment provides a synchronous sampling system for different branch currents, which comprises:
the judging module is used for judging whether the communication link is normal or not, wherein the communication link is a communication path between the master node and each slave node;
the master node and the slave node in this embodiment refer to devices with voltage sampling capability, current sampling capability, HPLC communication and voltage zero crossing detection, including but not limited to an electric energy meter, an acquisition terminal, an intelligent circuit breaker, an energy controller and an intelligent fusion terminal. Meanwhile, in order to ensure the synchronous effect, all the collected objects (the master node and the slave nodes) should adopt the same model and the same batch of equipment as much as possible.
Specifically, the judging module includes:
a first acquisition unit for acquiring a transmission time T 1 Transmission time T 1 A communication link availability confirmation command frame is sent to the slave node for the master node;
a second acquisition unit for acquiring the receiving time T 2 The receiving time T 2 A time when an acknowledgement frame sent from the slave node is received for the master node;
a calculating unit for calculating the transmission time T 1 And the reception time T 2 Time difference Δt of (2);
a judging unit for judging the time difference DeltaT and the threshold T SET When the delta T is<T SET And if not, the communication link is abnormal. Wherein T is SET For the threshold value, preferably, T is set SET When T should be made SET No greater than the time difference between the occurrence of the two zero crossings.
The sending module is used for sending synchronous sampling frame instructions to each slave node when the communication link is normal so as to enable each slave node and the master node to synchronously acquire current data and voltage data;
wherein, the voltage data that gathers comes from the voltage of same circuit, namely: in practice, all the acquired objects (master node and slave node) should share at least one voltage line. The synchronous sampling frame instruction is as follows: data acquisition is started at the nth zero crossing. Specifically, because the communication links from the master node to the slave nodes are not completely consistent, the time when the slave nodes receive the synchronous sampling frame is not consistent, in order to ensure that all the nodes (the master node and the slave nodes) can synchronously perform data acquisition, a delay with different time length is reserved for each slave node, so that each node can simultaneously acquire data at the Nth zero crossing point after undergoing the delay, namely:
after the master node sends a synchronous sampling frame command, the master node starts to collect the current and the voltage of the master node at the Nth zero crossing point;
the slave node starts to collect the slave node current and the slave node voltage at the nth zero crossing point after receiving the synchronous sampling frame command.
Where N may be determined based on the theoretical time consumption of transmission and reception of the "synchronous sampled frame", when the total time consumption of transmission and reception of the "synchronous sampled frame" is less than the time difference between the occurrences of the two zero crossings, the proposal is set to 2. Other conditions may be determined based on the actual conditions. Preferably, in order to minimize the influence caused by the time consumed by sending and receiving the "synchronous sampling frame", in the implementation, the sending time of the "synchronous sampling frame" of the master node may be set as follows: and immediately after detecting the zero crossing point.
The zero crossing point in this embodiment refers to a time point when the voltage changes from negative to positive, as shown in fig. 1.
Further, the synchronous sampling frame instruction is transmitted in the form of broadcasting.
Example 4
Because the scheme in the embodiment 3 has delay, the acquired synchronous data has deviation, so that the deviation is further reduced, the synchronism of the data is improved, the embodiment is optimized on the basis of the embodiment 3, and specifically, the implementation further comprises a receiving module, which is used for receiving the first acquired data returned from each slave node when the data acquisition with the specified length is completed, wherein the first acquired data comprises current data and voltage data;
the alignment module is used for automatically aligning the acquired data, wherein the acquired data comprises first acquired data and second acquired data, and the second acquired data is current data and voltage data acquired by the main node.
Further, the alignment module includes:
a third obtaining unit, configured to obtain an alignment reference node and a non-reference node, where the alignment reference node is: the node obtains the node corresponding to the maximum voltage data in the first sampling, and the maximum voltage data is larger than 0; the non-reference nodes are nodes except for the alignment reference nodes;
and the processing unit is used for comparing the voltage data acquired by the non-reference nodes with the maximum voltage data in sequence according to the acquisition sequence until the voltage data closest to the maximum voltage data is acquired, and deleting the voltage data and the current data acquired before the corresponding acquisition time of the voltage data. Preferably, in order to prevent excessive searching, the searching range may be set to the first K times of sampling data according to practical situations.
And the alignment unit is used for sequentially translating the undeleted data to align the data.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (4)
1. The synchronous sampling method for different branch currents is characterized by comprising the following steps:
judging whether a communication link is normal or not, wherein the communication link is a communication path between a master node and each slave node;
when the communication link is normal, sending synchronous sampling frame instructions to each slave node so as to enable each slave node and the master node to synchronously acquire current data and voltage data;
the collected voltage data come from the voltage of the same line, and the synchronous sampling frame instruction is as follows: starting data acquisition at the Nth zero crossing point;
the judging whether the communication link is normal or not comprises the following substeps: acquiring a transmission time T 1 The transmission time T 1 A communication link availability confirmation command frame is sent to the slave node for the master node; acquiring a receiving time T 2 The receiving time T 2 A time when an acknowledgement frame sent from the slave node is received for the master node; calculating the transmission time T 1 And the reception time T 2 Time difference Δt of (2); when the time difference is delta T<T SET When the communication link is normal, wherein T SET Is a threshold value;
further comprises: after the data acquisition of the designated length is completed, receiving first acquired data returned from each slave node, wherein the first acquired data comprises current data and voltage data; automatically aligning the acquired data, wherein the acquired data comprises first acquired data and second acquired data, and the second acquired data is current data and voltage data acquired by the main node;
the automatic alignment of the acquired data comprises the following substeps: obtaining an alignment reference node and a non-reference node, wherein the alignment reference node is: all nodes acquire nodes corresponding to maximum voltage data in the first sampling, and the maximum voltage data is larger than 0; the non-reference nodes are nodes except the alignment reference nodes; comparing the voltage data acquired by the non-reference nodes with the maximum voltage data in sequence according to the acquisition sequence until the voltage data closest to the maximum voltage data is acquired, and deleting the voltage data and the current data acquired before the corresponding acquisition time of the voltage data; and sequentially translating the undeleted data to align the data.
2. The method of claim 1, wherein the synchronous sampling frame instructions are transmitted in broadcast form.
3. Synchronous sampling system of different branch currents, characterized by comprising:
the judging module is used for judging whether the communication link is normal or not, wherein the communication link is a communication path between the master node and each slave node;
the sending module is used for sending synchronous sampling frame instructions to each slave node when the communication link is normal so as to enable each slave node and the master node to synchronously perform current data acquisition and voltage data acquisition;
the collected voltage data come from the voltage of the same line, and the synchronous sampling frame instruction is as follows: starting data acquisition at the Nth zero crossing point;
the judging module comprises: a first acquisition unit for acquiring a transmission time T 1 The transmission time T 1 A communication link availability confirmation command frame is sent to the slave node for the master node; a second acquisition unit for acquiring the receiving time T 2 The receiving time T 2 A time when an acknowledgement frame sent from the slave node is received for the master node; a calculating unit for calculating the transmission time T 1 And the reception time T 2 Time difference Δt of (2); a judging unit for judging the time difference DeltaT and the threshold T SET When the delta T is<T SET When the communication link is normal;
further comprises: the receiving module is used for receiving first collected data returned from each slave node when the data collection of the designated length is completed, wherein the first collected data comprises current data and voltage data; the alignment module is used for automatically aligning the acquired data, wherein the acquired data comprises first acquired data and second acquired data, and the second acquired data is current data and voltage data acquired by the main node;
the alignment module includes: a third obtaining unit, configured to obtain an aligned reference node and a non-reference node, where the aligned reference node is: all nodes acquire nodes corresponding to maximum voltage data in the first sampling, and the maximum voltage data is larger than 0; the non-reference nodes are nodes except the alignment reference nodes; the processing unit is used for comparing the voltage data acquired by the non-reference nodes with the maximum voltage data in sequence according to the acquisition sequence until the voltage data closest to the maximum voltage data is acquired, and deleting the voltage data and the current data acquired before the corresponding acquisition time of the voltage data; and the alignment unit is used for sequentially translating the undeleted data to align the data.
4. A synchronous sampling system for different branch currents as claimed in claim 3 wherein the synchronous sampling frame instructions are transmitted in broadcast form.
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