CN102881143B - Method for reading electric energy meter event records in AMI (Advanced Metering Infrastructure) system - Google Patents

Abstract

The invention relates to a method for reading event records of electric energy meters in an AMI system. The purpose of the present invention is to provide a method for reading the event record of the electric energy meter in the AMI system, so as to improve the success rate of communication. Technical scheme of the present invention: a, the master station or the concentrator regularly initiates the event state information reading frame; b, the electric meter sends the current event state information to the master station or the concentrator; c, the master station or the concentrator judges the event type, and sends The meter initiates an event record reading frame of the corresponding event type; d. The meter replies the event record data corresponding to the earliest event to the master station or concentrator; e. The master station or concentrator initiates the next event record reading frame to the meter , and update the reading time period; f. Reply the event record data corresponding to the earliest event in the new time period to the master station or concentrator, and repeat steps e and f; g. The master station or concentrator initiates a clear event status information frame . The invention is suitable for reading event records of electric meters by a concentrator or a master station under the DLMS protocol.

Description

The method of reading the event record of the electric energy meter in the AMI system

technical field

The invention relates to a method for reading event records of electric energy meters in an AMI system, especially the reading of event records of electric meters by a concentrator or a master station under the DLMS protocol (an international electric meter communication protocol).

Background technique

At present, when using power line carrier communication or GPRS communication on the electric energy meter to form an AMI (Advanced Metering Infrastructure) system, the international electric meter communication protocol DLMS/COSEM (organically composed of two parts, DLMS and COSEM, the former defines the message specification, and the latter Define the interface model of the electric energy meter) to communicate with the concentrator or the master station, and read the event records strictly following the protocol requirements, there will be the following problems:

1. If the meter has multiple events in a certain period of time, the master station or concentrator needs to read these data in the form of data blocks, and the communication process must be complete and continuous, as long as any one of the data blocks is in the process of communication If an exception occurs, then you need to read it again completely. Due to the current use of power carrier communication and GPRS communication, especially power carrier communication, there is a high probability of packet loss or other abnormalities during the communication process. If data reading using data blocks is used, the system communication efficiency will be greatly reduced.

2. When using data blocks to read data, the data packets are usually relatively large. When using power carrier communication, the success rate of system communication will be reduced, which will further affect the system communication efficiency.

3. When the concentrator or the master station cyclically inquires about the events of the electric meter, it currently inquires one by one event category. Since there are many types of events stored in the electric meter, even when no event occurs or only a few events occur on the electric meter, it is necessary to The query time of the concentrator or master station that takes a relatively long time greatly consumes the communication utilization efficiency of the communication medium, and when using GPRS communication, it will also increase a considerable part of the communication traffic.

The above problems lead to the low efficiency of reading the meter event records of the AMI system, seriously affecting the user experience of the AMI system, and taking up a considerable amount of time for the communication medium, and greatly restricting the scalability of subsequent AMI system functions.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for reading the event records of electric energy meters in the AMI system to avoid abnormal problems such as data loss during data packet transmission and improve the success rate of communication.

The technical scheme adopted in the present invention is: the method for reading electric energy meter event record in the AMI system, it is characterized in that the steps are as follows:

a. The master station or concentrator regularly sends the meter current event status information reading frame to the meter;

b. After receiving the event state information reading frame, the meter sends its own current event state information as a reply frame to the master station or concentrator;

c. If there are one or more types of event records in the event status information, the master station or concentrator first judges the event type, and then sends an event record reading frame of the corresponding event type to the meter to read the event records within a certain period of time. Event records, the cut-off time of this time period is the current time;

d. If there are one or more event records within the time period, the meter will reply the event record data corresponding to the earliest event to the master station or concentrator. The event record data includes the type of event and the time when the event occurred ;

e. The master station or concentrator initiates the next event record reading frame to the meter, and updates the reading time period, and its starting time is the next second of the previous event occurrence time;

f. If there are still one or more event records in the new time period, the meter will reply the event record data corresponding to the earliest event in the new time period to the master station or concentrator, and then repeat steps e and f in turn, There is no event record until the meter replies;

g. The master station or concentrator initiates a clear event status information frame to the meter to clear the event status information already recorded in the meter.

The event state information has 4 bytes in total, and each bit corresponds to an event type. As long as an event occurs at a certain moment, the meter will change the bit corresponding to the event type in the event state information to 1.

In the step c, if there is no event record in the event status information, return to step a to operate the next electric meter.

In the step c, the starting time of the time period is the last time when the main station or the concentrator sends an event state information reading frame to the electric meter.

In step c, if the event record is read for the first time after the meter is running, the start time of the time period is the time when the meter starts running.

In the step c, if there are multiple types of events, the master station or concentrator reads the event records of a certain type within the above time period, and then sequentially reads other types of event records within the time period.

In the step f, if there is no event record in the new time period, reply that there is no event record, and execute step g.

After step g is executed, return to step a to operate the next electric meter.

The event status information includes all types of events that occur when the meter is running.

The way for the electric meter to record the event state information is that as long as an event occurs at a certain moment, the electric meter will record the event type of the event in the event state information, and will not delete the event state information by itself.

The beneficial effects of the present invention are: 1, in the present invention, the master station or concentrator reads the event record and adopts the mode of retrieval by time period, that is, only reads the event record in a certain event period, and controls the electric meter to only reply at most each time. An event record (if there is an event record within the time period), thereby reducing the amount of data in each communication, avoiding abnormal problems such as data loss caused by data packet transmission caused by multiple events, and greatly increasing the success rate of communication . 2. The event status information consists of 4 bytes (32 bits), each of which corresponds to an event type. If one of the bits is 1, it indicates that this type of event has occurred. If it is 0, then Indicates that no such type of event has occurred; the master station or concentrator only needs to read the event status information regularly to know all the events that have occurred in the current meter, and quickly locate the event that is currently occurring in the meter to avoid It eliminates the large amount of communication media and time occupied by querying event types one by one, and improves communication efficiency.

Description of drawings

Fig. 1 is an overall frame diagram of the smart grid information system in the present invention.

Fig. 2 is a flow chart of reading the event record of the electric energy meter in the present invention.

Detailed ways

As shown in Figure 1, the smart grid in this example is composed of a master station 1, a concentrator 2, and a group of smart meters 3 under the concentrator, where the concentrator 2 and each meter 3 are connected through a power line 4 to realize information transmission . As shown in Figure 2, the method for reading the event record of the electric energy meter in this embodiment includes the following steps:

a. The master station 1 sends the current event status information reading frame of the meter to the meter 3 through the GPRS network or the concentrator 2 at regular intervals through the power line 4 (that is, the read event status frame in Figure 2), and the master station 1 or the concentrator 2 Only operate on a certain meter at a time.

b. After receiving the event state information reading frame, the electric meter 3 will immediately reply its own current event state information, that is, send a reply event state frame to the master station 1 or the concentrator 2 . The event status information includes all types of events that occur when the electric meter 3 is running. The way for the meter 3 to record event status information is that as long as an event occurs at a certain moment, the meter 3 will record the event type of the event in the event status information (that is, the meter will change the bit corresponding to the event type in the event status information to 1) , and will not delete the event status information by itself, only the master station 1 and the concentrator 2 can clear the information to ensure that the event can be read by the master station 1 or concentrator 2 in time.

c. The master station 1 or concentrator 2 analyzes the event status information after receiving the reply from the meter 3. The analysis process is as follows: If there is no event record in the event status information, it indicates that no event has occurred during the operation of the meter, and returns at this time Step a operates on the next electric meter; if there are event records of one or more event types in the event state information, it indicates that one or more events have occurred during the operation of the electric meter, and at this time the master station 1 or concentrator 2 first Determine what type of event occurred, and then send an event record reading frame of the corresponding event type to the meter 3 (different event types have different event record reading frames), and read event records within a certain period of time, that is, the master The station 1 or the concentrator 2 reads the event records in the way of searching by time period, and only reads the event records in a certain time period each time. The starting time of the time period can be set arbitrarily, but in order to avoid the Missed reading, while ensuring the efficiency of event record reading. In this example, the starting time of the time period is set to the time when master station 1 or concentrator 2 initiates an event status information reading frame to the meter 3 last time. If it is For the reading of the first event record after the meter is running, the starting time is the time when the meter starts running, and the ending time is always the current time.

d. After the electric meter 3 receives the event record reading frame sent by the master station 1 or the concentrator 2, it will search the time period to be read by the master station 1 or the concentrator 2 inside the meter (the time period described in step c ) within the event record; if there are one or more event records in the time period, the meter 3 will reply the earliest event record in the time period, that is, the event record corresponding to the earliest event in the time period The data is replied to the master station 1 or the concentrator 2, and the event record data replied includes the type of the event (that is, what type of event) and the time when the event occurred.

e. After the master station 1 or the concentrator 2 receives the event record data replied by the meter (that is, the meter 3 replied a piece of event record data), the master station 1 or the concentrator 2 records the time information according to the event record data (that is, the event occurred time), update the read time period, and send an event record read frame to the meter again, the start time of this time period is the next second of the previous event occurrence time, and the end time is still the current time.

f. If there are still one or more event records in the new time period, the meter 3 will reply the earliest event record in the new time period, that is, the event record data corresponding to the earliest event in the new time period will be replied to Master station 1 or concentrator 2, then repeat steps e and f in turn until meter 3 replies that there is no event record, and finally master station 1 or concentrator 2 stops reading event records, and executes step g; if there is no event in the new time period record, the meter 3 replies that there is no event record, the master station 1 or concentrator 2 stops reading the event record, and executes step g. As an embodiment of the present invention, if the electric meter 3 records three events, the recorded time is 12:00:00 (12:00:00) on May 1, 2012, and 12:03 on May 1, 2012: 00 (12:03:00), 12:05:00 (12:5:00) on 2012-5-1, assuming the current time is 12:06:00 on 2012-5-1, master station 1 or Concentrator 2 will do the following retrieval,

The master station 1 or the concentrator 2 sends the retrieval time period from 11:59:00 on May 1, 2012 to 12:06:00 on May 1, 2012. At this time, the meter 3 only responds to the earliest An event record, the time is 12:00:00 on May 1, 2012;

Master station 1 or concentrator 2 initiates the second event record reading frame, and modifies the start time of the retrieval time period to be the next second after the previous event occurrence time, that is, 12:00:01~2012 on May 1, 2012 -5-1 at 12:06:00, at this time, meter 3 only replies to the earliest event record in the new retrieval time period, the time is 2012-5-1 at 12:03:00;

Master station 1 or concentrator 2 initiates the third event record reading frame, and modifies the start time of the retrieval time period to be the next second after the time of the previous event, that is, 12:03:01~2012 on May 1, 2012 -5-1 at 12:06:00, at this time, meter 3 only replies to the earliest event record in the new retrieval time period, and the time is 2012-5-1 at 12:05:00;

The master station 1 or the concentrator 2 initiates the fourth event record reading frame, modifying the start time of the retrieval time period to be the next second after the previous event occurrence time, that is, 12:05:01~2012 on May 1, 2012 -5-1 at 12:06:00, at this time, the meter 3 replies that there is no event record, the master station 1 or the concentrator 2 stops reading the event record, and executes step g.

g. The master station 1 or the concentrator 2 initiates a clear event status information frame to the meter, and clears the event status information recorded in the meter 3 .

h. Return to step a, and operate on the next electric meter 3 .

In the step c, if there are multiple types of events, they are generally processed in sequence according to the importance of the event types, that is, the master station 1 or the concentrator 2 first initiates the event record reading frame corresponding to the most important event type, and sends the After reading all event records (corresponding to the most important event type) in the above time period, the event record reading frame corresponding to the second important event type is sent to the meter, and all event records in the time period (corresponding to The next important event type) has been read, and it is repeated in order of importance from high to low until all event types have been read.

As an improvement of this embodiment, the event state information provided by the electric meter 3 has 4 bytes in total, that is, 32 bits, each of which is used to indicate a different event type, and the 4-byte event state information can indicate the events supported by the current electric meter. All event types, and greatly reduce the amount of communication data. As an embodiment of the present invention, the electric meter currently supports 19 event types, using 19 bits in the 4-byte event status information to represent each event type respectively. Since the occurrence of the event is a small probability event, any type of event is possible event, the master station 1 and the concentrator 2 do not need to regularly check whether there are new events for these 19 types of events, but only need to regularly read the event status information to know all the events that have occurred in the current meter, greatly Communication time and communication media are saved. the

Claims (10)

1. A method for reading electric energy meter event records in an AMI system, characterized in that the steps are as follows: a. The master station (1) or the concentrator (2) regularly sends the meter (3) to read the current event status information frame of the meter; b. After receiving the event state information reading frame, the electric meter (3) sends its own current event state information as a reply frame to the master station (1) or concentrator (2); c. If there are one or more types of event records in the event status information, the master station (1) or concentrator (2) first judges the event type, and then initiates an event record reading frame of the corresponding event type to the meter (3) , to read the event records in a certain time period, the cut-off time of the time period is the current time; d. If there are one or more event records within the time period, the meter (3) will reply the event record data corresponding to the earliest event to the master station (1) or concentrator (2). Contains the type of event and when the event occurred; e. The master station (1) or concentrator (2) initiates the next event record reading frame to the meter, and updates the reading time period, and its starting time is the next second of the previous event occurrence time; f. If there are still one or more event records in the new time period, the meter (3) will reply the event record data corresponding to the earliest event in the new time period to the master station (1) or concentrator (2) , and then repeat steps e and f in turn until the meter (3) replies that there is no event record; g. The master station (1) or the concentrator (2) initiates a clear event status information frame to the meter (3), and clears the event status information already recorded in the meter (3). 2. The method for reading the event record of the electric energy meter in the AMI system according to claim 1 is characterized in that: the event state information has 4 bytes altogether, wherein each bit corresponds to indicating a kind of event type, as long as a certain Whenever an event occurs, the meter (3) changes the bit corresponding to the event type in the event state information to 1. 3. according to the method for reading electric energy meter event record in the AMI system described in claim 1 or 2, it is characterized in that: in the described step c, if there is no event record in the event status information, return to step a to carry out the next electric meter operate. 4. The method for reading event records of electric energy meters in the AMI system according to claim 1 or 2, characterized in that: in the step c, the starting time of the time period is the master station (1) or the concentrator (2) The last time when an event state information reading frame was initiated to the meter (3). 5. according to the method for reading electric energy meter event record in the described AMI system of claim 1 or 2, it is characterized in that: in step c, if the reading of event record is carried out for the first time after this electric meter runs, the starting time of described time period The start time is the time when the meter starts to run. 6. The method for reading event records of electric energy meters in the AMI system according to claim 1 or 2, characterized in that: in said step c, if there are multiple event types, the master station (1) or concentrator (2 ) After reading a certain type of event records in the above time period, read other types of event records in this time period in turn. 7. according to the method for reading electric energy meter event record in the AMI system described in claim 1 or 2, it is characterized in that: in the described step f, if there is no event record in the new time period, then reply that there is no event record, and execute step g. 8. The method for reading event records of electric energy meters in the AMI system according to claim 1 or 2, characterized in that: after step g is executed, return to step a to operate the next electric meter. 9. The method for reading the event record of the electric energy meter in the AMI system according to claim 1 or 2, characterized in that: the event state information includes all types of events that occur when the electric meter is running. 10. The method for reading event records of electric energy meters in the AMI system according to claim 1 or 2, characterized in that: the electric meter (3) records event status information in such a way that as long as an event occurs at a certain moment, the electric meter ( 3) The event type of the event will be recorded in the event status information, and the event status information will not be deleted by itself.

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