CN117729108A - Electric energy meter broadcast upgrading method - Google Patents

Abstract

The invention discloses a broadcasting upgrading method of an electric energy meter, which comprises the following steps: counting transmission performance data issued by unicast and broadcast; initializing an upgrade cache matrix, which is used for recording the receiving condition of each data packet in each electric energy meter; determining data packets to be issued in the round and the issuing mode of each data packet according to the transmission performance data and the upgrading cache matrix; executing the issuing of the data packet of the round, and updating the updating cache matrix; and determining whether all the electric energy meters are updated according to the current value of the update cache matrix, and repeating the next round of data packet issuing if the electric energy meters are not updated. According to the invention, an upgrade buffer matrix is constructed to record the receiving condition of each electric energy meter, and an upgrade strategy is dynamically adjusted according to the real-time value of the upgrade buffer matrix and transmission performance data such as communication delay, packet loss rate and the like, and the issuing mode and priority of the data packet are continuously changed according to the upgrade condition, so that the upgrade efficiency and success rate are remarkably improved.

Description

Electric energy meter broadcast upgrading method

Technical Field

The invention relates to an upgrading method of an electric energy meter.

Background

Firmware upgrade functions are an important component of the operation and maintenance process of the electric energy meter in the overseas AMI system. The overseas AMI system users often need to adjust or add functions of the electric energy meter under the condition that the equipment is installed and operated, and at this time, firmware upgrading is needed for the electric energy meter.

In order to improve the upgrading efficiency, the electric energy meter is generally upgraded in a broadcasting mode, namely, firmware of the electric energy meter is firstly stored in a centralized acquisition device (DCU for short), and then the DCU transmits the firmware packets to each electric energy meter in a broadcasting mode through a communication module, such as a Power Line Carrier (PLC), a micro-power wireless (RF) and the like. The actual broadcast upgrade effect is greatly affected by the field power quality and the communication efficiency, and is mainly embodied in the following two aspects:

1. in the scene of poor power quality, the electric energy meter may frequently have a power failure, resulting in loss of received data.

2. The communication quality may be unstable due to the influence of the actual environment of the site, and random communication delay or data packet loss occurs.

Therefore, under the condition that the power supply quality and the communication efficiency are not ideal, the firmware data packet received by the electric energy meter can be randomly lost. Even through multi-round broadcasting, it is difficult to ensure that all the electric energy meters receive complete data packets, so that the efficiency and success rate of broadcasting upgrading are reduced.

Disclosure of Invention

The invention provides a broadcasting upgrading method of an electric energy meter, which aims at: the problem of the electric energy meter broadcasting upgrade efficiency and success rate lower is solved.

The technical scheme of the invention is as follows:

the broadcasting upgrading method of the electric energy meter includes the following steps that firmware to be issued and upgraded is divided into a plurality of data packets:

step 1, counting transmission performance data issued by unicast and broadcast;

step 2, initializing an upgrade cache matrix R, wherein the upgrade cache matrix R is used for recording the receiving condition of each data packet in each electric energy meter, each row of the upgrade cache matrix R corresponds to each electric energy meter one by one, and each column of the upgrade cache matrix R corresponds to each data packet one by one;

step 3, determining the data packets to be issued in the round and the issuing mode of each data packet according to the transmission performance data and the upgrading cache matrix R;

step 4, executing the issuing of the data packet of the round, and updating the updated cache matrix R according to the issuing condition;

and 5, determining whether all the electric energy meters are upgraded according to the current value of the upgrade cache matrix R, if so, ending, otherwise, returning to the step 3.

As a further improvement of the electric energy meter broadcast upgrading method: the transmission performance data in step 1 includes unicast delay of each electric energy meter, and broadcast delay and packet loss rate when broadcasting all electric energy meters.

As a further improvement of the electric energy meter broadcast upgrading method: unicast delay of ith electric energy meterThe statistical mode of (a) is as follows:

wherein N is _S Representing a statistical total number of unicast times,indicating the communication delay time of the nth unicast;

the broadcast delay when broadcasting all the electric energy meters is defined as: the time from the beginning of issuing the broadcast command by the DCU to the time when all the electric energy meters receive the command is L _B A representation;

packet loss rate P when broadcasting all electric energy meters _B The statistical mode of (a) is as follows:

wherein N is _M For the total number of the electric energy meters, C ⁱ Indicating the number of times that the ith electric energy meter does not receive the broadcast command, C _B Indicating the total number of times the command was broadcast.

As a further improvement of the electric energy meter broadcast upgrading method: upgrading the cache matrix R to N _M ×B _T N in matrix form _M For the total number of the electric energy meters, B _T The total number of the data packets;

upgrading elements of ith row and jth column in cache matrix RIndicating the condition that the ith electric energy meter receives the jth data packet, if the value is 1, the receiving is indicated, and if the value is 0, the receiving is not indicated;

and (2) when initializing in the step (2), updating all element values of the cache matrix R to be 0.

As a further improvement of the electric energy meter broadcast upgrading method: the step 3 specifically comprises the following steps:

step 3-1, determining the issuing mode of each data packet in the round;

step 3-2, determining the issuing reference row of the round in the upgrading cache matrix R;

step 3-3, traversing each element in the issuing reference row, taking the data packets corresponding to all the elements with the value of 0 as the data packets to be issued in the round, and determining the issuing mode of each data packet to be issued according to the issuing mode of each data packet determined in the step 3-1.

As a further improvement of the electric energy meter broadcast upgrading method: the specific process of the step 3-1 is as follows:

firstly, solving the current unicast total delay of each column in the upgrade cache matrix R:

wherein,unicast total delay, representing jth column in upgrade cache matrix R, +.>Unicast delay for the ith electric energy meter;

for each column in the upgrade cache matrix R, i.e. each packet:

if it isIf 0 is that all the electric energy meters have received the data packet corresponding to the j-th column, the j-th data packet does not need to be issued;

if it isThe manner of issuing the j-th data packet is further determined: if-> The j-th data packet is sent in a broadcast mode, otherwise, in a unicast mode, wherein L _B Representing broadcast delay, P, when broadcasting all electric energy meters _B And the packet loss rate when broadcasting all the electric energy meters is indicated.

As a further improvement of the electric energy meter broadcast upgrading method: the specific process of the step 3-2 is as follows:

firstly, obtaining the sum of element values of each row in the upgrade cache matrix R:

a sum of element values representing the i-th row;

find allThe row corresponding to the minimum value of the row is taken as the issuing reference row.

As a further improvement of the electric energy meter broadcast upgrading method: in step 4, sequentially issuing the data packets to be issued selected in step 3;

for each data packet to be delivered: if the issuing mode of the data packet is unicast, the data packet is issued to an electric energy meter corresponding to the issuing reference row in the unicast mode, and the value of an element corresponding to the data packet in the issuing reference row is set to be 1; if the data packet is broadcast, the data packet is transmitted to all electric energy meters in a broadcast mode, and the values of all elements in columns of the upgrade cache matrix R corresponding to the data packet are set to be 1.

As a further improvement of the electric energy meter broadcast upgrading method, the specific process of the step 5 is as follows:

step 5-1, traversing each row of the upgrade cache matrix R: if all the element values of a certain row are 1, the electric energy meter corresponding to the row is subjected to meter reading, and whether the electric energy meter has received all the data packets is determined:

if all the data packets have been received, a firmware activation command is issued to the electric energy meter, the electric energy meter is marked, the data packet receiving condition of the electric energy meter is not collected any more, and the row is deleted from the upgrading cache matrix R and the total number N of the electric energy meter is updated _M ；

If the electric energy meter does not receive all the data packets, setting the element value in the row in the upgrading cache matrix R corresponding to the data packet which is not received to be 0;

step 5-2, if the number of lines of the upgrade cache matrix R is 0, indicating that all the electric energy meters have completed firmware activation, and ending the upgrade task; otherwise, the message indicates that the message needs to be sent down continuously, and the step 3 is executed again.

As a further improvement of the electric energy meter broadcast upgrading method: if the upgrade task is interrupted, it starts in step 5 when execution of the upgrade task resumes.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, an upgrade buffer matrix is constructed to record the receiving condition of each electric energy meter, and an upgrade strategy is dynamically adjusted according to the real-time value of the upgrade buffer matrix and transmission performance data such as communication delay, packet loss rate and the like, and the issuing mode and priority of the data packet are continuously changed according to the upgrade condition, so that the upgrade efficiency and success rate are remarkably improved.

Detailed Description

The following describes the technical scheme of the invention in detail:

typically, one DCU will communicate with multiple power meters. The DCU has the functions of data acquisition and packaging in the whole system, and the data of the electric energy meter is collected into the DCU in a centralized manner and then is packaged and uploaded to an upper communication system of the DCU in a unified manner. The DCU typically communicates with the power meter via a communication medium such as PLC, HPLC, RF. Such data acquisition modes and communication modes are common centralized meter reading system components and are well known to those skilled in the art. Therefore, the communication networking mode of the DCU and the electric energy meter in the invention is not described in detail.

Furthermore, the broadcast upgrading method in the invention requires the DCU and the electric energy meter to have the following functions:

(1) Communication between the DCU and the electric energy meter supports a broadcasting mode;

(2) A communication supporting point-to-point unicast mode of the DCU and the electric energy meter;

(3) The DCU can obtain the firmware packet number received by a single electric energy meter, namely, which data packets are received and which data packets are not received;

(4) The electric energy meter supports the DCU to randomly issue an upgrade data packet and store the upgrade data packet to the local without issuing the upgrade data packet sequentially;

(5) The process of receiving the upgrade data packet by the electric energy meter is not continuous, namely, a plurality of upgrade data packets can be issued, then other communication operations are carried out, and then the upgrade data packets are issued continuously.

The above functions are common functions of the acquisition system, and most DCUs and electric energy meters have these functions, so the implementation process of the present invention is not specifically described.

The invention is defined and described as follows:

unicast delay: the delay of the DCU in peer-to-peer communication with a single meter, i.e. the time elapsed from the issuance of the DCU command to the receipt of the meter's reply. In general, unicast delay is obviously affected by field environment, and unicast delay of each ammeter is different. The unicast procedure has a response mechanism and a retransmission mechanism, and thus is generally considered to be reliable.

Broadcast delay: the DCU transmits the command to all electric energy meters communicating with the DCU in a broadcasting mode, the electric energy meters do not need to respond to the command, and the delay refers to the time from the start of transmitting the broadcasting command to the time when all the electric energy meters receive the command. Typically, the broadcast delay is a fixed time and is 8-10 times the unicast delay value. The broadcasting process has no response mechanism and has certain probability of packet loss.

Broadcast packet loss rate: after the DCU issues the broadcast command to the electric energy meter, the electric energy meter can receive the probability of the broadcast command. Broadcast packet loss rate is a priori knowledge. In general, after the scale of the area, the total number of the electric meters and the installation position are determined, the numerical value can be obtained a priori in a statistical mode.

Before issuing, generally, according to the communication mode of the DCU and the electric energy meter, the communication efficiency is comprehensively considered, and the upgrading firmware is divided into a plurality of data packets.

The method for upgrading the electric energy meter broadcast in the embodiment comprises the following steps:

and step 1, counting transmission performance data issued by unicast and broadcast.

The transmission performance data comprise unicast delay of each electric energy meter, and broadcast delay and packet loss rate when broadcasting all the electric energy meters, and the specific statistical calculation mode is as follows:

(1) Unicast delay of ith electric energy meterThe statistical mode of (a) is as follows:

wherein N is _S Indicating the total number of point-to-point unicast communications of the counted DCU with the electric energy meter,indicating the communication delay time of the nth unicast.

(2) The broadcast delay when broadcasting all the electric energy meters is defined as: the time from the beginning of issuing the broadcast command by the DCU to the time when all the electric energy meters receive the command is L _B And (3) representing.

(3) Packet loss rate P when broadcasting all electric energy meters _B The statistical mode of (a) is as follows:

wherein N is _M For the total number of the electric energy meters, C ⁱ Indicating that the ith electric energy meter does not receiveUp to the number of broadcast commands, C _B Indicating the total number of times the command was broadcast.

Step 2, initializing an upgrade cache matrix R, wherein the upgrade cache matrix R is used for recording the receiving condition of each data packet in each electric energy meter, each row of the upgrade cache matrix R corresponds to each electric energy meter one by one, and each column of the upgrade cache matrix R corresponds to each data packet one by one.

Specifically, the update buffer matrix R is N _M ×B _T N in matrix form _M For the total number of the electric energy meters, B _T Is the total number of data packets. Upgrading elements of ith row and jth column in cache matrix RIndicating that the ith electric energy meter receives the jth data packet, if the value is 1, the jth data packet is received, and if the value is 0, the jth data packet is not received.

And when the method is initialized, all element values of the upgrade cache matrix R are 0.

And step 3, determining the data packets to be issued in the round and the issuing mode of each data packet according to the transmission performance data and the upgrading cache matrix R. The method specifically comprises the following steps:

and 3-1, determining the issuing mode of each data packet in the round.

Firstly, solving the current unicast total delay of each column in the upgrade cache matrix R:

wherein,unicast total delay, representing jth column in upgrade cache matrix R, +.>Unicast delay for the ith electric energy meter.

For each column, namely, each data packet in the upgrade cache matrix R, the following judgment is performed:

(1) If it isA value of 0 indicates that all the electric energy meters have received the data packet corresponding to the j-th column (all +.>All are 1), the j-th data packet does not need to be issued, and the issuing mode does not need to be determined.

(2) If it isThe manner of issuing the j-th data packet is further determined: if-> The j-th data packet is sent in a broadcast mode, otherwise, in a unicast mode, wherein L _B Representing broadcast delay, P, when broadcasting all electric energy meters _B And the packet loss rate when broadcasting all the electric energy meters is indicated.

And 3-2, determining the issuing reference row of the round in the upgrading cache matrix R.

Firstly, obtaining the sum of element values of each row in the upgrade cache matrix R:

representing the sum of the element values of row i.

Find allThe row corresponding to the minimum value of the row is taken as the issuing reference row. In the present embodimentAssume that the IndexR row in the reference behavior matrix R is issued.

Step 3-3, traversing each element in the issuing reference row, taking the data packets corresponding to all the elements with the value of 0 as the data packets to be issued in the round, and determining the issuing mode of each data packet to be issued according to the issuing mode of each data packet determined in the step 3-1.

And 4, executing the issuing of the round of data packet, and updating the updated cache matrix R according to the issuing condition.

For each data packet to be issued, the following judgment is carried out respectively:

it is assumed that the currently processed data packet to be issued corresponds to the index c column in the matrix R, i.e. the currently processed data packet is the index c data packet, and that there is currently necessarilyIf the data packet is issued in a unicast mode, issuing the IndexC data packet to an IndexR electric energy meter in a unicast mode, and issuing the element corresponding to the data packet in a reference row, namely +.>The value of (2) is set to 1. If the data packet is broadcast, the IndexC data packet is transmitted to all electric energy meters in a broadcast mode, and the values of all elements in the IndexC column in the matrix R are set to be 1.

And 5, determining whether all the electric energy meters are upgraded according to the current value of the upgrade cache matrix R, if so, ending, otherwise, returning to the step 3. The specific process is as follows:

step 5-1, traversing each row of the upgrade cache matrix R: if all the element values of a certain row are 1, the electric energy meter corresponding to the row is subjected to meter reading, and whether the electric energy meter has received all the data packets is determined:

(1) If all the data packets have been received, a firmware activation command is issued to the electric energy meter, the electric energy meter is marked, the data packet receiving condition of the electric energy meter is not collected any more, and the row is simultaneously executedDeleting and updating total number N of electric energy meters from upgrading cache matrix R _M 。

(2) If the electric energy meter does not receive all the data packets, indicating that the data packets are not received correctly after the transmission, resetting the element value in the row in the upgrading cache matrix R corresponding to the data packets which are not received to 0.

And 5-2, if the number of lines of the upgrading cache matrix R is 0, indicating that all the electric energy meters have completed firmware activation, and ending the upgrading task. Otherwise, the message indicates that the message needs to be sent down continuously, and the step 3 is executed again.

If the upgrade task is affected by a DCU outage or is interrupted by another higher priority task, then step 5 begins when execution of the upgrade task resumes.

Claims (10)

1. The broadcasting upgrading method of the electric energy meter is characterized in that firmware to be issued and upgraded is divided into a plurality of data packets, and the method comprises the following steps:

step 1, counting transmission performance data issued by unicast and broadcast;

step 2, initializing an upgrade cache matrix R, wherein the upgrade cache matrix R is used for recording the receiving condition of each data packet in each electric energy meter, each row of the upgrade cache matrix R corresponds to each electric energy meter one by one, and each column of the upgrade cache matrix R corresponds to each data packet one by one;

step 3, determining the data packets to be issued in the round and the issuing mode of each data packet according to the transmission performance data and the upgrading cache matrix R;

step 4, executing the issuing of the data packet of the round, and updating the updated cache matrix R according to the issuing condition;

and 5, determining whether all the electric energy meters are upgraded according to the current value of the upgrade cache matrix R, if so, ending, otherwise, returning to the step 3.

2. The method for upgrading a broadcast of an electric energy meter of claim 1, wherein: the transmission performance data in step 1 includes unicast delay of each electric energy meter, and broadcast delay and packet loss rate when broadcasting all electric energy meters.

3. The method for upgrading electric energy meter broadcasting of claim 2, wherein: unicast delay of ith electric energy meterThe statistical mode of (a) is as follows:

wherein N is _S Representing a statistical total number of unicast times,indicating the communication delay time of the nth unicast; the broadcast delay when broadcasting all the electric energy meters is defined as: the time from the beginning of issuing the broadcast command by the DCU to the time when all the electric energy meters receive the command is L _B A representation;

packet loss rate P when broadcasting all electric energy meters _B The statistical mode of (a) is as follows:

wherein N is _M For the total number of the electric energy meters, C ⁱ Indicating the number of times that the ith electric energy meter does not receive the broadcast command, C _B Indicating the total number of times the command was broadcast.

4. The method for upgrading electric energy meter broadcasting of claim 2, wherein: upgrading the cache matrix R to N _M ×B _T N in matrix form _M For the total number of the electric energy meters, B _T The total number of the data packets; upgrading elements of ith row and jth column in cache matrix RIndicating the condition that the ith electric energy meter receives the jth data packet, if the value is 1, the receiving is indicated, and if the value is 0, the receiving is not indicated;

and (2) when initializing in the step (2), updating all element values of the cache matrix R to be 0.

5. The method for upgrading electric energy meter broadcasting of claim 4, wherein: the step 3 specifically comprises the following steps:

step 3-1, determining the issuing mode of each data packet in the round;

step 3-2, determining the issuing reference row of the round in the upgrading cache matrix R;

step 3-3, traversing each element in the issuing reference row, taking the data packets corresponding to all the elements with the value of 0 as the data packets to be issued in the round, and determining the issuing mode of each data packet to be issued according to the issuing mode of each data packet determined in the step 3-1.

6. The method for upgrading electric energy meter broadcasting of claim 5, wherein: the specific process of the step 3-1 is as follows:

firstly, solving the current unicast total delay of each column in the upgrade cache matrix R:

wherein,unicast total delay, representing jth column in upgrade cache matrix R, +.>Unicast delay for the ith electric energy meter;

for each column in the upgrade cache matrix R, i.e. each packet:

if it isIf 0 is that all the electric energy meters have received the data packet corresponding to the j-th column, the j-th data packet does not need to be issued;

if it isThe manner of issuing the j-th data packet is further determined: if->The j-th data packet is sent in a broadcast mode, otherwise, in a unicast mode, wherein L _B Representing broadcast delay, P, when broadcasting all electric energy meters _B And the packet loss rate when broadcasting all the electric energy meters is indicated.

7. The method for upgrading electric energy meter broadcasting of claim 5, wherein: the specific process of the step 3-2 is as follows:

firstly, obtaining the sum of element values of each row in the upgrade cache matrix R:

a sum of element values representing the i-th row;

find allThe row corresponding to the minimum value of the row is taken as the issuing reference row.

8. The method for upgrading electric energy meter broadcasting of claim 5, wherein: in step 4, sequentially issuing the data packets to be issued selected in step 3;

for each data packet to be delivered: if the issuing mode of the data packet is unicast, the data packet is issued to an electric energy meter corresponding to the issuing reference row in the unicast mode, and the value of an element corresponding to the data packet in the issuing reference row is set to be 1; if the data packet is broadcast, the data packet is transmitted to all electric energy meters in a broadcast mode, and the values of all elements in columns of the upgrade cache matrix R corresponding to the data packet are set to be 1.

9. The method for upgrading electric energy meter broadcasting according to any one of claims 4 to 8, wherein the specific process of step 5 is as follows:

step 5-1, traversing each row of the upgrade cache matrix R: if all the element values of a certain row are 1, the electric energy meter corresponding to the row is subjected to meter reading, and whether the electric energy meter has received all the data packets is determined:

if all the data packets have been received, a firmware activation command is issued to the electric energy meter, the electric energy meter is marked, the data packet receiving condition of the electric energy meter is not collected any more, and the row is deleted from the upgrading cache matrix R and the total number N of the electric energy meter is updated _M ；

If the electric energy meter does not receive all the data packets, setting the element value in the row in the upgrading cache matrix R corresponding to the data packet which is not received to be 0;

step 5-2, if the number of lines of the upgrade cache matrix R is 0, indicating that all the electric energy meters have completed firmware activation, and ending the upgrade task; otherwise, the message indicates that the message needs to be sent down continuously, and the step 3 is executed again.

10. The method for broadcasting upgrade of electric energy meter of claim 9, wherein: if the upgrade task is interrupted, it starts in step 5 when execution of the upgrade task resumes.