CN113934133B - Control command confirmation method and system suitable for security control system - Google Patents

Abstract

The present invention discloses a control command confirmation method suitable for a security control system, comprising: obtaining a data frame from a command sending end; judging whether the data frame is a control command frame according to a frame header in the data frame; if it is a control command frame, confirming the control command according to a command status word and a command continuity word. The present invention introduces the concept of a command status word and the number of times the same command status is sent continuously, thereby simplifying the method for confirming multiple consecutive frames of a control command without reducing reliability, and can prevent the problem of failure in confirming multiple consecutive frames of a control command caused by jitter in the sending interval of the sending end or occasional frame loss on a communication link.

Description

Control command confirmation method and system applicable to security control system

Technical Field

The present invention belongs to the technical field of power systems and automation thereof, and in particular relates to a control command confirmation method and system suitable for a security control system.

Background technique

The power system safety and stability control system is generally composed of a control master station, a control substation, and a control execution station. The control master station, the control substation, and the control execution station are generally composed of a main chassis, an IO chassis, or a communication chassis. The communication chassis receives the main chassis message and decomposes it to send to the remote site, and packages the message information of multiple remote sites to the main chassis for processing. Analog quantities, switch quantities, and control commands are interacted with the outside through the communication chassis. The relevant regulations stipulate that one frame of information should be interacted with the remote site within 1.667ms, that is, 600 frames per second. In order to meet the above requirements, the communication chassis generally sends information to the outside at fixed intervals. When receiving control commands from remote sites, in order to prevent errors during command transmission, the relevant regulations generally require that the control commands must be confirmed by multiple consecutive frames before they can be finally executed. In engineering, the practice of 3 consecutive frames of confirmation is generally adopted. The source of the command is the host chassis. The interval of issuing multi-frame commands of the host chassis is affected by factors such as task scheduling and interrupt jitter. It is generally difficult to ensure that they are sent strictly at equal intervals. The communication chassis generally sends them to the outside at equal intervals. If the communication message of the host chassis is not received, the conventional practice is not to send data to the remote site, or to stop sending after sending the last repeated data to the remote site for a period of time. The regulations also require continuous multi-frame confirmation. The jitter of the sending interval at the sending end or the occasional frame loss of the communication channel may lead to the extension of the continuous multi-frame confirmation time on the receiving side. For safe and stable control, generally speaking, the longer the control time, the greater the control cost.

Summary of the invention

In order to solve the problems existing in the prior art, the present invention provides a control command confirmation method and system applicable to a security control system, which can reduce the confirmation time of the control command of the security control system.

The technical problem to be solved by the present invention is achieved through the following technical solutions:

In a first aspect, a control command confirmation method applicable to a security control system is provided, comprising:

Get the data frame from the command sender;

Judging whether the data frame is a control command frame according to the frame header in the data frame;

If it is a control command frame, the control command is confirmed according to the command status word and the command continuation word.

In combination with the first aspect, further, confirming the control command according to the command status word and the command continuation word includes:

If it is a control command frame, it will be stored in the control command confirmation cache. If the number of control command frames Q in the cache is not less than the confirmation threshold P, the command status words in these Q frames are compared to see if they are consistent. If they are consistent, it is determined whether the command continuity words in these Q frames are incremented in sequence. If they are all consistent, the control command is confirmed to be passed.

In combination with the first aspect, further, the threshold P is set according to user needs.

In combination with the first aspect, further comprising:

If no control command frame is received from the command sender for t×P time, the control command buffer is cleared;

Where t is the fixed sending time interval of the control command frame.

In combination with the first aspect, further comprising:

If a non-control command frame is received, the control command confirmation buffer will be cleared immediately.

In a second aspect, a control command confirmation system applicable to a security control system is provided, comprising:

A data acquisition module, used for acquiring data frames from a command sending end;

A command frame judging module, used for judging whether a data frame is a control command frame according to a frame header in the data frame;

The command confirmation module is used to confirm the control command according to the command status word and the command continuation word if it is a control command frame.

In combination with the second aspect, further, the command confirmation module includes:

A cache module, used for storing the control command frame into a control command confirmation cache if it is a control command frame;

The status word judgment module is used to compare whether the command status words in the Q frames are consistent if the number of control command frames Q in the cache is not less than the confirmation threshold P;

The continuous word judgment module is used to judge whether the command continuous words in the Q frame are incremented in sequence based on whether the command status words are consistent. If they are all consistent, the control command is confirmed to be passed.

In combination with the second aspect, further, the command confirmation module also includes a cache clearing module:

Used to clear the control command buffer when no control command frame is received from the command sender for a continuous period of t×P;

Where t is the fixed sending time interval of the control command frame;

If a non-control command frame is received, the control command confirmation buffer will be cleared immediately.

In a third aspect, a control command confirmation system applicable to a security control system is also provided, comprising a memory and a processor;

The memory is used to store instructions;

The processor is used to operate according to the instructions to execute the steps of the method according to any one of the first aspects.

The beneficial effects of the present invention include: the present invention simplifies the method of confirming multiple consecutive frames of control commands without reducing reliability by introducing the concept of command status words and the number of consecutive times the same command status is sent, and can prevent the problem of failure in confirming multiple consecutive frames of control commands caused by jitter in the sending interval of the sending end or occasional frame loss on the communication link.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a processing flow chart of a transmitting end command status word and a command continuation word in the present invention;

FIG2 is a flow chart of a method for confirming continuous multiple frames of control commands in the present invention;

FIG. 3 is a schematic diagram of a control command frame sequence including frames with check errors and lost frames in the present invention.

Detailed ways

In order to further describe the technical features and effects of the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

Example 1

As shown in FIG1-3, a control command confirmation method applicable to a security control system is provided, comprising the following steps:

Step 1: Get the data frame from the command sender.

The fields contained in the data frame are shown in Table 1:

Table 1 Fields included in the data frame

When the command source (sender) sends a command, if the current command is consistent with the last command, Cmd_St remains unchanged and Cmd_Sq increases by 1; if the current command is inconsistent with the last command, Cmd_St increases by 1 and Cmd_Sq is reset to 1; if the current command is a command and the last command was a frame non-control command, Cmd_St increases by 1 and Cmd_Sq is reset to 1.

Step 2: The receiving side distinguishes whether the currently received frame is a control command frame or a non-control command frame by the frame header.

Step 3: Confirm the control command according to the command status word and command continuation word.

For a certain control command sequence, the receiving side needs to continuously confirm P (P is flexibly set according to the actual user's needs, and P is assumed to be 3 here) frames before it can be executed. The sending side sends a frame every 1.667ms, and sends 8 frames of the same control command frame, that is, a control command frame is sent at 0ms, 1.667ms, 3.333ms, 5ms, 6.667ms, 8.333ms, 10ms, and 11.667ms. That is, the frame header at the above moment is the control command frame header, Com_St remains unchanged, and Com_Sq increases. Due to the communication link, the communication frame received by the receiving side at 3.333ms is incorrectly checked, and the frame loss at 6.667ms is not received. The traditional continuous confirmation method can only continuously confirm the three frames of 8.333ms, 10ms, and 11.667ms. After the control command is issued, it takes 11.667ms to be confirmed and executed, otherwise it is necessary to wait for the next three consecutive frames again, which is inefficient; and the present invention introduces the command status word Com_St and the command continuity word Com_Sq, because the receiving side can detect that the frame headers of 0ms, 1.667ms and 5ms are all control command frame headers, and the command status words Com_St of these three frames are the same, the command continuity word Com_Sq increases, and the other key information words that need to be continuously confirmed are also consistent, it can be considered that the control command sent by the sending side has not changed, so it can be regarded as a control command that is continuously confirmed through 3 frames.

Under this working condition, the control command of the present invention can be confirmed and executed in just 5 ms after it is issued, which greatly increases the speed of responding to the command compared to the 11.667 ms of the traditional method.

During the control command confirmation process, if no control command frame is received from the command sender within the duration S (S≥t×P), the control command cache is cleared to prevent the cache from being unnecessary occupied; if a non-control command frame is currently received, it is likely that the subsequent frame will still be a non-control command frame, then the control command confirmation cache is immediately cleared to prevent wasting the cache.

Where t is the fixed sending time interval of the control command frame.

Example 2

The present invention also provides a control command confirmation system applicable to a security control system, comprising:

A data acquisition module, used for acquiring data frames from a command sending end;

A command frame judging module, used for judging whether a data frame is a control command frame according to a frame header in the data frame;

The command confirmation module is used to confirm the control command according to the command status word and the command continuation word if it is a control command frame.

The command confirmation module includes:

A cache module, used for storing the control command frame into a control command confirmation cache if it is a control command frame;

The status word judgment module is used to compare whether the command status words in the Q frames are consistent if the number of control command frames Q in the cache is not less than the confirmation threshold P;

The continuous word judgment module is used to judge whether the command continuous words in the Q frame are incremented in sequence based on whether the command status words are consistent. If they are all consistent, the control command is confirmed to be passed.

The command confirmation module also includes a cache clearing module:

Used to clear the control command buffer when no control command frame is received from the command sender for a continuous period of t×P;

Where t is the fixed sending time interval of the control command frame;

If a non-control command frame is received, the control command confirmation buffer will be cleared immediately.

Example 3

The present invention also provides a control command confirmation system applicable to a security control system, comprising a memory and a processor;

The memory is used to store instructions;

The processor is configured to operate according to the instructions to execute the steps of any one of the methods provided by the present invention.

Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

The present invention is described with reference to the flowchart and/or block diagram of the method, device (system) and computer program product according to the embodiment of the present application. It should be understood that each process and/or box in the flowchart and/or block diagram, and the combination of the process and/or box in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the function specified in one process or multiple processes in the flowchart and/or one box or multiple boxes in the block diagram.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims (7)

1. A control command confirmation method applicable to a security control system, characterized by comprising: Get the data frame from the command sender; Judging whether the data frame is a control command frame according to the frame header in the data frame; If it is a control command frame, the control command is confirmed according to the command status word and the command continuation word; The confirming of the control command according to the command status word and the command continuation word comprises: If it is a control command frame, it will be stored in the control command confirmation cache. If the number of control command frames Q in the cache is no less than the confirmation threshold P, the command status words in the Q frames are compared to see if they are consistent. If they are consistent, it is determined whether the command continuity words in the Q frames are incremented in sequence. If they are all consistent, the control command is confirmed to be passed. 2. A control command confirmation method suitable for a security control system according to claim 1, characterized in that the threshold P is set according to user needs. 3. A control command confirmation method applicable to a security control system according to claim 2, characterized in that it also includes: If no control command frame is received from the command sender for t×P time, the control command buffer is cleared; Where t is the fixed sending time interval of the control command frame. 4. The control command confirmation method applicable to a security control system according to claim 2, characterized in that it also includes: If a non-control command frame is received, the control command confirmation buffer will be cleared immediately. 5. A control command confirmation system suitable for a security control system, characterized by comprising: A data acquisition module, used for acquiring data frames from a command sending end; A command frame judging module, used for judging whether a data frame is a control command frame according to a frame header in the data frame; A command confirmation module, used for confirming the control command according to the command status word and the command continuation word if it is a control command frame; The confirming of the control command according to the command status word and the command continuation word comprises: If it is a control command frame, it will be stored in the control command confirmation cache. If the number of control command frames Q in the cache is not less than the confirmation threshold P, the command status words in these Q frames are compared to see if they are consistent. If they are consistent, it is determined whether the command continuity words in these Q frames are incremented in sequence. If they are all consistent, the control command is confirmed to be passed. 6. A control command confirmation system suitable for a security control system according to claim 5, characterized in that the command confirmation module further comprises a cache clearing module: Used to clear the control command cache when no control command frame is received from the command sending end for a continuous period of t×P; where t is a fixed sending time interval of the control command frame; If a non-control command frame is received, the control command confirmation buffer will be cleared immediately. 7. A control command confirmation system suitable for a security control system, characterized by comprising a memory and a processor; The memory is used to store instructions; The processor is used to operate according to the instructions to execute the steps of the method according to any one of claims 1 to 4.