CN110266105B - Cluster measurement and control device interval automatic switching method based on station control layer GOOSE - Google Patents
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Abstract
The invention discloses a cluster measurement and control device interval automatic switching method based on station control layer GOOSE, and aims to solve the problem that a standby measurement and control interval is automatically switched on due to the fact that a monitored measurement and control interval is abnormal. Generating a character string of a unique identifier in a station of a GOOSE message, calculating a CRC value of the character string, and writing a CRC value group corresponding to each interval GOOSE sending control block to the FPGA one by one; the FPGA monitors GOOSE messages through the CRC value of the uniquely identified character string and informs an HMI; the HMI receives GOOSE message notification of the specific unique identification of the FPGA, and the measurement and control interval of the HMI is automatically switched on and off. All measurement and control intervals of the cluster measurement and control device of the third-generation intelligent substation comprise station control layer GOOSE, so that the cluster measurement and control device has better universality; the GOOSE message has short length, and the message is simple to organize and analyze; under the condition that the device quits corresponding to the measurement and control interval, the standby interval can be automatically switched in, seamless switching between the switching-in state and the quitting state is realized, and manual intervention is not needed.
Description
Technical Field
The invention belongs to the technical field of cluster measurement and control devices, and particularly relates to a cluster measurement and control device interval automatic switching method based on station control layer GOOSE.
Background
The new generation intelligent transformer substation is deployed on a bay level according to cluster type measurement and control, measurement and control intervals are virtualized to form a resource pool of a cluster of a plurality of cluster measurement and control devices, available resources in the resource pool are dynamically distributed, and the requirement is that one cluster measurement and control device can simultaneously operate a plurality of measurement and control intervals, the measurement and control intervals in the plurality of cluster measurement and control devices can be mutually standby, one set of measurement and control operates at the same time, and the other set of measurement and control is standby, so that the cluster measurement and control device is required to dynamically monitor whether a corresponding device is in an operating state in real time, and under the abnormal condition of one set of measurement and control device, the other set of measurement and control device is automatically switched in, and.
The cluster measurement and control device requires the same IP address for the running and standby measurement and control intervals to ensure the invisibility of the measurement and control intervals to the background when the running state is switched, and the IP address of the standby measurement and control intervals is invisible, so the running state cannot be monitored through direct communication of interval measurement and control. In the operation process of the cluster measurement and control group, the cluster measurement and control device is always in an operation state, and a plurality of measurement and control intervals in the cluster measurement and control device are operated or standby, so that whether the measurement and control intervals of the external cluster measurement and control device are sent to a station control layer GOOSE or not is monitored by the cluster measurement and control device, and whether the corresponding measurement and control intervals of the external cluster measurement and control device are in the operation state or not can be directly judged. Therefore, according to the requirement that the measurement and control intervals required by the current cluster measurement and control are mutually standby for operation, a cluster measurement and control interval automatic switching method based on the station control layer GOOSE is provided.
Disclosure of Invention
The invention aims to provide a cluster measurement and control device interval automatic switching method based on station control layer GOOSE, and aims to solve the problem that in the prior art, a standby measurement and control interval is automatically switched on under the condition that a monitored measurement and control interval is switched off due to abnormity or insufficient resources of a cluster measurement and control device where the monitored measurement and control interval is located.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a cluster measurement and control device interval automatic switching method based on station control layer GOOSE comprises the following steps:
a. generating a character string of a unique identifier in a station of a GOOSE message, calculating a CRC value of the character string, and writing a CRC value group corresponding to each interval GOOSE sending control block to the FPGA one by one;
b. the FPGA monitors GOOSE messages through the CRC value of the uniquely identified character string and informs an HMI;
c. the HMI receives GOOSE message notification of the specific unique identification of the FPGA, and the measurement and control interval of the HMI is automatically switched on and off.
The step a comprises the following steps:
aa. Splicing a character string for identifying a unique identifier in a station according to a destination MAC address, appID, datSet and GOCBref of the GOOSE message, and calculating a CRC value of the character string;
ab. Extracting unique identification character strings from all GOOSE sending control blocks at a single interval and calculating CRC values to form a CRC value array;
ac. Writing the interval CRC value array to the FPGA;
ad. And repeating the steps, and writing the CRC value groups corresponding to the GOOSE sending control blocks at intervals to the FPGA one by one.
The step b comprises the following steps:
ba. The FPGA receives an external GOOSE, extracts a target MAC address, appID, datSet and GOCBref of a GOOSE message, splices the destination MAC address, appID, datSet and GOCBref into a character string with a unique identifier, and calculates a CRC value of the character string;
bb. Comparing the calculated CRC value with the received CRC value array one by one, if the calculated CRC values are different, discarding the message, if the calculated CRC values are the same as one of the CRC values, modifying the bit of the corresponding position identifier into 1, and exiting the comparison procedure.
The step c comprises the following steps:
ca. The HMI judges the main/standby state of the measurement and control interval of the local machine according to the sending content of the external GOOSE;
cb. The HMI reads identification bit array information corresponding to the CRC value of the FPGA at regular time;
cc. If the measurement and control interval is in the state of the main equipment, reading the identification bit array and calculating to immediately input or delay to quit the measurement and control interval; and if the measurement and control interval is in a standby state, reading the identification bit array and calculating to carry out delayed input or immediately quit the measurement and control interval.
The identification bit array is a bit array, and after the HMI reads the bit array, the clearing state is set to be all 0.
The CRC value is calculated by a CRC-32 algorithm.
Compared with the prior art, the invention has the following beneficial effects: the method of the invention has the characteristics of universality, usability and autonomy, and is concretely expressed as follows,
(1) the method has the advantages that the universality is high, and all measurement and control intervals of the cluster measurement and control device of the third-generation intelligent substation comprise station control layer GOOSE, so that the method has high universality;
(2) the method has the advantages that the method is easy to use, the GOOSE message is short in length, the message is simple to organize and analyze, and the method is generally applied to the current transformer substation and is simple to implement;
(3) autonomy, under the condition that the device exits corresponding to the measurement and control interval, the standby interval can be automatically put in, seamless switching between the put-in state and the exit state is realized, and manual intervention is not needed.
Drawings
Fig. 1 is a schematic diagram of CRC (cyclic redundancy check) discrimination logic of an FPGA external message of an interval automatic switching method of a cluster measurement and control device based on a GOOSE in a station control layer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of interval switching judgment logic of an HMI of a cluster measurement and control device interval automatic switching method based on a station control layer GOOSE according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Under the condition that one cluster measurement and control device can operate a plurality of measurement and control intervals, and the measurement and control intervals of the plurality of cluster measurement and control devices are mutually standby, how to ensure that only one measurement and control interval operates at the same moment, and how to ensure that the standby measurement and control intervals are quickly put into use under the condition that the operating measurement and control intervals are abnormally withdrawn is an important problem which needs to be solved by a new generation of intelligent transformer substation.
The invention relates to a cluster measurement and control device interval automatic switching method based on station control layer GOOSE, which comprises the following steps: generating a character string of a unique identifier in a station of a GOOSE message, calculating a CRC value of the character string, and writing a CRC value group corresponding to each interval GOOSE sending control block to the FPGA one by one; and B: the FPGA monitors the GOOSE message through the CRC value and informs the HMI; and C: the HMI receives GOOSE message notification of the specific unique identification of the FPGA, if the external part of the cluster measurement and control is judged to have corresponding interval measurement and control running, the HMI quits the corresponding interval of the device, and if the external part of the cluster measurement and control quits the interval measurement and control, the HMI puts in the corresponding interval of the cluster measurement and control. The method of the invention realizes that only one entity operates at the same time in the same interval measurement and control in the cluster measurement and control device group, thereby ensuring the seamless switching of a plurality of sets of measurement and control, and the upper application can not see the plurality of sets of interval measurement and control in the transformer substation which are mutually backed up.
The design steps of the automatic switching on and off of the cluster measurement and control interval specifically comprise the following processes:
step A: and generating a character string of the unique identifier in the station of the GOOSE message, calculating a CRC value of the character string, and writing a CRC value group corresponding to each interval GOOSE sending control block to the FPGA one by one.
aa. And splicing a character string for identifying the unique identifier in the station according to the destination MAC address, appID, datSet and GOCBref of the GOOSE message, and calculating the CRC value of the character string through a CRC32 algorithm.
And extracting destination MAC address, appID, datSet and GOCBref fields in a GOOSE sending control block in the GOOSE configuration, wherein the destination MAC address and appID are unique in the whole station, and the datSet and GOCBref fields are unique in the GOOSE control block in the measurement and control device, so that a character string consisting of the destination MAC address, the appID, the datSet and the GOCBref fields is unique in the whole station.
ab. And repeating aa, extracting the unique identification character string from all the GOOSE sending control blocks of the single interval, and calculating the CRC value to form a CRC value array.
A plurality of GOOSE sending control blocks are arranged in a single measurement and control interval, the enabling condition of the single GOOSE control block is considered, each GOOSE sending control block in the interval needs to be monitored, and therefore CRC values of the GOOSE sending control blocks are calculated one by one to form a CRC value array.
ac. The set of interval CRC values is set to the FPGA.
The effective effect of the interval automatic switching method is that the interval automatic switching method is applied in an HMI program, namely the upper layer of an operating system, and an FPGA works under the operating system and belongs to a data driving layer, so that the data transmission can adopt a shared memory or interactive message mode.
ad. And repeating the steps, and writing the CRC value groups corresponding to the GOOSE sending control blocks at intervals to the FPGA one by one.
The cluster measurement and control consists of a plurality of measurement and control intervals, and the automatic switching method of the measurement and control intervals judges the measurement and control of the plurality of intervals simultaneously, so that the CRC value array of the GOOSE sending control block of each interval is written to the FPGA one by one.
And B: the FPGA monitors the GOOSE message through the CRC value and informs the HMI, and the specific process is shown in figure 1.
ba. And the FPGA receives the external GOOSE, extracts a destination MAC address, appID, datSet and GOCBref of the GOOSE message, splices the destination MAC address, appID, datSet and GOCBref into a unique identification character string, and calculates the CRC value of the character string through a CRC32 algorithm.
After obtaining the message from the external network port, the FPGA firstly judges whether the message is a GOOSE type message, two bytes after the MAC address of the bare message after the VLAN is removed are the message type, the type of the GOOSE message is fixed to 0x88B8, and if the message is a GOOSE message, the FPGA extracts the destination MAC address, appID, datSet and GOCBref fields and calculates CRC32 of the destination MAC address, appID, datSet and GOCBref fields.
bb. Comparing the calculated CRC value with the received CRC value array one by one, if the calculated CRC values are different, discarding the message, if the calculated CRC values are the same as one of the CRC values, modifying the bit of the corresponding position identifier into 1, and exiting the comparison procedure.
When the CRC value is compared with the received CRC value array, the head of the CRC value array does not need to be compared with the tail of the CRC value array, and for one cluster measurement and control device, GOOSE sending control blocks at any intervals are different, so that if the CRC value of an external GOOSE is found to be the same as one CRC value in the CRC value array, comparison can be quitted after the mark position is 1.
And C: the HMI receives the GOOSE message notification of the specific unique identifier of the FPGA, and the measurement and control interval of the HMI automatically switches on and off, and the specific process is as shown in fig. 2.
ca. The HMI judges the main/standby state of the local measurement and control interval according to the sending content of the external GOOSE.
In the intelligent substation cluster, for two interval measurement and control in the two cluster measurement and control, the interval needs to be determined to be a main/standby state, the main equipment preferentially operates, the standby equipment operates in a standby mode, and the initial setting of the main/standby state is set by a background according to the operation capacity of the cluster measurement and control device.
cb. And the HMI reads identification bit array information corresponding to the CRC value sequence of the FPGA at fixed time.
The sequence of the CRC value array and the sequence of the identification bit array are in one-to-one correspondence, so that the GOOSE monitoring and switching processing of each measurement and control interval are consistent, the HMI needs to erase the content of the identification bit array after reading the identification bit array, and thus, the non-0 value when reading again next time is ensured to be newly set by the FPGA.
cc. If the measurement and control interval is in the state of the main equipment, judging whether to put in the standby interval or not through the first step, and judging whether to quit the interval or not through the second step;
when the measurement and control interval is in a main equipment state, the requirements of immediate input and delayed exit are required to be met, namely the measurement and control interval is immediately input under the condition that the standby measurement and control interval exits, namely, the measurement and control interval is immediately input after the content of the read identification bit for one time meets the input condition, the measurement and control interval is delayed to exit under the condition that the standby measurement and control interval is input, the measurement and control interval in the main equipment state is guaranteed to run preferentially, and the exit operation of the interval is performed when the content of the read identification bit for three times is the same and meets the exit condition;
if the measurement and control interval is in a standby state, judging whether to put the standby interval into the measurement and control interval or not through the third step, and judging whether to quit the interval or not through the fourth step;
when the measurement and control interval is in the state of the main equipment, the requirements of delayed input and immediate exit are required to be met, namely, the measurement and control interval is delayed to be input under the condition that the main measurement and control interval exits, the input operation of the interval is carried out when the content of the reading identification bits of three consecutive times is the same and meets the input condition, the measurement and control interval exits immediately under the condition that the input of the main measurement and control interval is judged, and the exit operation of the interval immediately after the content of the reading identification bits of one time meets the exit condition is represented.
The method judges the switching logic of the measurement and control interval based on the GOOSE heartbeat message frequency, so that the actual interval of reading the identification bit array by the HMI is +0.5 second of the GOOSE heartbeat message time, each reading operation is guaranteed to be the operation of one GOOSE heartbeat period, and the synchronism of the GOOSE heartbeat and the HMI switching logic is guaranteed.
In summary, the invention provides an effective and effective scheme for mutual backup of multiple virtual interval measurement and control in a cluster measurement and control cluster resource pool under the background of a new generation of intelligent substation based on the GOOSE cluster measurement and control interval automatic switching method of the station control layer, ensures that only one measurement and control interval with the same function is in an operating state at the same time, and provides a feasible method for seamless coordination of the measurement and control intervals among cluster measurement and control devices.
The method can ensure that only one virtual measurement and control interval is in the running state at the same time in different cluster measurement and control devices, and the standby interval is immediately put into use when the running virtual measurement and control interval is normal, abnormal or background manual, thereby ensuring that the background can safely and reliably monitor the running state of the transformer substation in real time at any time. The method has the characteristics of universality, usability and autonomy, and is particularly shown in the following mode, all measurement and control intervals of the cluster measurement and control device of the third-generation intelligent substation comprise station control layer GOOSE, so that the method has better universality; the method has the advantages that the method is easy to use, the GOOSE message is short in length, the message is simple to organize and analyze, and the method is generally applied to the current transformer substation and is simple to implement; autonomy, under the condition that the device exits corresponding to the measurement and control interval, the standby interval can be automatically put in, seamless switching between the put-in state and the exit state is realized, and manual intervention is not needed.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A cluster measurement and control device interval automatic switching method based on station control layer GOOSE is characterized by comprising the following steps:
a. generating a character string of a unique identifier in a station of a GOOSE message, calculating a CRC value of the character string, and writing a CRC value group corresponding to each interval GOOSE sending control block to the FPGA one by one;
b. the FPGA monitors GOOSE messages through the CRC value of the uniquely identified character string and informs an HMI;
c. the HMI receives GOOSE message notification of the specific unique identification of the FPGA, and the measurement and control interval of the HMI is automatically switched on and switched off;
the step c comprises the following steps:
ca. The HMI judges the main/standby state of the measurement and control interval of the local machine according to the sending content of the external GOOSE;
cb. The HMI reads identification bit array information corresponding to the CRC value of the FPGA at regular time;
cc. If the measurement and control interval is in the state of the main equipment, reading the identification bit array and calculating to immediately input or delay to quit the measurement and control interval; and if the measurement and control interval is in a standby state, reading the identification bit array and calculating to carry out delayed input or immediately quit the measurement and control interval.
2. The cluster measurement and control device interval automatic switching method based on the station control layer GOOSE as claimed in claim 1, wherein the step a comprises the following steps:
aa. Splicing a character string for identifying a unique identifier in a station according to a destination MAC address, appID, datSet and GOCBref of the GOOSE message, and calculating a CRC value of the character string;
ab. Extracting unique identification character strings from all GOOSE sending control blocks at a single interval and calculating CRC values to form a CRC value array;
ac. Writing the interval CRC value array to the FPGA;
ad. And repeating the steps, and writing the CRC value groups corresponding to the GOOSE sending control blocks at intervals to the FPGA one by one.
3. The station control layer GOOSE based cluster measurement and control device interval automatic switching method as claimed in claim 1, wherein the step b comprises the following steps:
ba. The FPGA receives an external GOOSE, extracts a target MAC address, appID, datSet and GOCBref of a GOOSE message, splices the destination MAC address, appID, datSet and GOCBref into a character string with a unique identifier, and calculates a CRC value of the character string;
bb. Comparing the calculated CRC value with the received CRC value array one by one, if the calculated CRC values are different, discarding the message, if the calculated CRC values are the same as one of the CRC values, modifying the bit of the corresponding position identifier into 1, and exiting the comparison procedure.
4. The cluster measurement and control device interval automatic switching method based on the station control layer GOOSE as claimed in claim 1, wherein the flag bit array is a bit array, and the clearance state is set to all 0 after the HMI reads the bit array.
5. The cluster measurement and control device interval automatic switching method based on the station control layer GOOSE is characterized in that the CRC value is obtained through calculation of a CRC-32 algorithm.
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