CN114126028B - Differential protection method, differential protection device, communication unit and storage medium - Google Patents
Differential protection method, differential protection device, communication unit and storage medium Download PDFInfo
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- CN114126028B CN114126028B CN202010889843.7A CN202010889843A CN114126028B CN 114126028 B CN114126028 B CN 114126028B CN 202010889843 A CN202010889843 A CN 202010889843A CN 114126028 B CN114126028 B CN 114126028B
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- 238000004891 communication Methods 0.000 title claims abstract description 274
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- 230000001360 synchronised effect Effects 0.000 claims abstract description 57
- 238000001514 detection method Methods 0.000 claims abstract description 44
- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 238000005070 sampling Methods 0.000 claims description 20
- 230000004044 response Effects 0.000 claims description 15
- 238000012790 confirmation Methods 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 238000004590 computer program Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 230000006855 networking Effects 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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Abstract
The embodiment of the invention discloses a differential protection method, a differential protection device, a communication unit and a storage medium. Applied to a first communication unit, comprising: establishing wireless communication connection with a second communication unit and sending a synchronization pulse to a first differential protection device, wherein the second communication unit synchronously sends the synchronization pulse to the second differential protection device, and the first differential protection device and the second differential protection device are arranged at two ends of a detection circuit; receiving second message data sent by a second differential protection device through a second communication unit; and sending the second message data to the first differential protection device so that the first differential protection device performs differential protection on the detection circuit according to the acquired first message data and the received second message data. The communication unit sends synchronous pulse to the differential protection device to realize automatic timing synchronization, and the differential protection devices at two ends of the detection line directly transmit message data through the connected communication unit, thereby reducing transmission delay and jitter interval.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a differential protection method, a differential protection device, a communication unit and a storage medium.
Background
The differential protection of the power grid is a system application very important for the safety of the power grid, and the current mature scheme is to connect the differential protection devices at two ends of a high-voltage circuit in a wired mode and perform differential protection. However, the method requires a large amount of optical fiber deployment, has high construction cost and inflexible deployment, and provides a wireless communication method based on the method.
However, in order to ensure the synchronism of the data collected by the differential protection devices at two ends, the differential protection based on wireless communication generally needs to rely on an external GPS or a clock source such as the Beidou for timing synchronization, and needs to transmit wireless messages by means of an operator public network system. Therefore, the timing cost is high, and the problems of large transmission delay and jitter interval of the message are also affected. Therefore, the existing differential protection mode based on wireless communication cannot meet the requirements of users on power grid differential protection.
Disclosure of Invention
The embodiment of the invention provides a differential protection method, a differential protection device, a communication unit and a storage medium, so as to realize differential protection of a detection circuit.
In a first aspect, an embodiment of the present invention provides a differential protection method, including: establishing wireless communication connection with a second communication unit and sending a synchronization pulse to a first differential protection device, wherein the second communication unit synchronously sends the synchronization pulse to the second differential protection device, and the first differential protection device and the second differential protection device are arranged at two ends of a detection circuit; receiving second message data sent by a second differential protection device through a second communication unit; and sending the second message data to the first differential protection device so that the first differential protection device performs differential protection on the detection circuit according to the acquired first message data and the received second message data.
In a second aspect, an embodiment of the present invention provides a differential protection device, including: the synchronous pulse transmitting module is used for establishing wireless communication connection with the second communication unit and transmitting synchronous pulses to the first differential protection device, wherein the second communication unit synchronously transmits the synchronous pulses to the second differential protection device, and the first differential protection device and the second differential protection device are arranged at two ends of the detection circuit; the message data transmission module is used for receiving second message data sent by the second differential protection device through the second communication unit; the differential protection module is used for sending the second message data to the first differential protection device so that the first differential protection device performs differential protection on the detection circuit according to the collected first message data and the received second message data.
In a third aspect, an embodiment of the present invention provides a communication unit, including:
One or more processors;
A storage means for storing one or more programs;
When the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the methods in any of the embodiments of the present invention.
In a fourth aspect, embodiments of the present invention also provide a computer storage medium having stored thereon a computer program which, when executed by a processor, implements a method as in any of the embodiments of the present invention.
According to the technical scheme of the embodiment of the invention, the communication unit sends the synchronous pulse to the connected differential protection device, automatic timing synchronization is realized under the condition of no external equipment, and the differential protection devices at the two ends of the detection line directly realize the transmission of message data through the connected communication unit, so that the transmission delay and jitter interval are reduced, and the requirement of a user on differential protection is met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 (a) is a flow chart of a differential protection method according to a first embodiment of the present invention;
Fig. 1 (b) is a schematic diagram of an application scenario of a differential protection method according to an embodiment of the present invention;
Fig. 1 (c) is a timing diagram of transmitting a synchronization pulse in a first scenario according to an embodiment of the present invention;
FIG. 1 (d) is a schematic diagram of a synchronization pulse according to a first embodiment of the present invention;
Fig. 1 (e) is a timing diagram of transmitting a synchronization pulse in a second scenario according to a first embodiment of the present invention;
fig. 1 (f) is a timing diagram of transmitting a synchronization pulse in a third scenario according to the first embodiment of the present invention;
fig. 2 is a flowchart of a differential protection method according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a differential protection device according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a communication unit according to a fourth embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
It should be further noted that, for convenience of description, only some, but not all of the matters related to the present invention are shown in the accompanying drawings. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently, or at the same time. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Example 1
Fig. 1 (a) is a flowchart of a differential protection method according to an embodiment of the present invention, where the embodiment is applicable to the case of performing differential protection on a detection circuit, the method may be performed by a differential protection device according to an embodiment of the present invention, and the device may be implemented in software and/or hardware. As shown in fig. 1 (a), the method specifically includes the following operations:
Step 101, establishing a wireless communication connection with the second communication unit and transmitting a synchronization pulse to the first differential protection device.
The second communication unit synchronously sends synchronous pulses to the second differential protection device, and the first differential protection device and the second differential protection device are arranged at two ends of the detection circuit.
Specifically, as shown in fig. 1 (b), an application scenario of the differential protection method is schematically shown, where the differential protection device a and the differential protection device b are respectively disposed at two ends of the detection circuit, and respectively perform differential protection on the detection circuit. The differential protection device a and the differential protection device B adopt a wireless communication mode to carry out synchronous interactive transmission on the acquired data based on the communication unit A and the communication unit B. The types of wireless communication networks in which the communication units a and B are located in the wireless communication network in this embodiment may be a single point-single point networking, a single point-multi-point star topology networking, or a multi-point Mesh topology networking, and thus the types of wireless communication networks in which the communication units a and B are located in the embodiment are not limited. And the communication unit a and the communication unit realize timing synchronization of the differential protection device a and the differential protection device b by output of the synchronization pulse. And the first communication unit in the present embodiment may refer to a communication unit a, the first differential protection device refers to a differential protection device a, and the second communication unit may refer to a communication unit B, and the second differential protection device refers to a differential protection device B; of course, the first communication unit may refer to the communication unit B, the first differential protection device may refer to the differential protection device B, the second communication unit may refer to the communication unit a, and the second differential protection device may refer to the differential protection device a.
Optionally, the first differential protection device and the second differential protection device are in an operating state before the first communication unit and the second communication unit establish communication connection; establishing a communication connection with the second communication unit and transmitting a synchronization pulse to the first differential protection device may include: after communication connection is established with the second communication unit, the synchronization pulse is directly sent to the first differential protection device.
Specifically, the first communication unit in this embodiment may send a synchronization pulse to the first differential protection device through the physical interface, and the second communication unit simultaneously sends a synchronization pulse to the second differential protection device, so as to provide stable and reliable timing or counting clocks for the first differential protection device and the second differential protection device, thereby realizing the relative synchronization of the first differential protection device and the second differential protection device that are far apart.
In one specific implementation, for a first scenario: the differential protection device a and the differential protection device B are already in operation before the communication unit a and the communication unit B establish a communication connection, as shown in fig. 1 (c), and are timing diagrams for transmitting synchronization pulses in the first scenario. Wherein. 1.11 and 1.12 are specifically that a differential protection device a and a differential protection device b positioned at two ends of a detection line are started first, and the differential protection devices at two ends are determined to be started and enter a working state; 1.2 the communication unit A establishes communication connection with the communication unit B; 1.31 the communication unit A automatically sends a synchronization pulse to the differential protection device a immediately after completing the communication connection with the communication unit B; 1.32 the communication unit B sends synchronization pulses to the differential protection device B in synchronization. In the first scenario, since it has been determined that the differential protection device a and the differential protection device B are already in the working state, it may be set in advance that the communication unit a and the communication unit B directly transmit the synchronization pulse by themselves after completing the communication connection, and stop transmitting the synchronization pulse after interrupting the connection, so that the communication unit a and the communication unit B can achieve synchronous transmission of the pulse without negotiation through a handshake mechanism.
As shown in fig. 1 (d), the synchronization pulse in this embodiment may be a high-precision second pulse, and the second pulse may be indicated by different period outputs, where the synchronization pulse in this embodiment is composed of a wide pulse with a period of 1000ms and a narrow pulse with a period of 1ms, and the width of the wide pulse is 100us, and the width of the narrow pulse is 10us. Of course, the present embodiment is described by taking only an example including a wide pulse with a period of 1000ms and a narrow pulse with a period of 1ms, and the configuration of the synchronization pulse is not particularly limited, as long as it is within the scope of the present application to assist the differential protection device at both ends in achieving the relative synchronization timing.
Optionally, the first differential protection device and the second differential protection device are not in an operating state before the first communication unit and the second communication unit establish communication connection; establishing a communication connection with the second communication unit and transmitting a synchronization pulse to the first differential protection device may include: establishing a communication connection with a second communication unit; generating a start synchronization pulse output instruction in response to detecting a synchronization pulse output request from the first differential protection device; and sending a start synchronous pulse output instruction to the second communication unit, and sending synchronous pulses to the first differential protection device according to the designated output time slot of the synchronous pulses fed back by the second communication unit.
Optionally, sending the start synchronization pulse output instruction to the second communication unit, and sending the synchronization pulse to the first differential protection device according to the designated output time slot of the feedback of the second communication unit may include: transmitting a start synchronization pulse output instruction to a second communication unit, and judging whether a synchronization pulse determination message fed back by the second communication unit is received, wherein the synchronization pulse determination message comprises a designated output time slot of a synchronization pulse, if so, a confirmation response message is transmitted to the second communication unit, and a synchronization pulse is transmitted to a first differential protection device in the designated output time slot, and the second communication unit synchronously transmits the synchronization pulse to the second differential protection device in the designated output time slot; otherwise, sending a synchronization pulse output request invalidation message to the first differential protection device, receiving a synchronization pulse output request periodically generated by the first differential protection device according to the output request invalidation message until the synchronization pulse determination message fed back by the second communication unit is determined to be received, sending a confirmation response message to the second communication unit, and sending a synchronization pulse to the first differential protection device in a designated output time slot.
Optionally, before generating the start synchronization pulse output instruction in response to detecting the synchronization pulse output request from the first differential protection device, the method may further include: transmitting a first operating state of the first communication unit to the first differential protection device; receiving a second working state of the first differential protection device; and storing the second working state of the first differential protection device locally.
Specifically, before determining that the first differential protection device and the second differential protection device are not in a working state before the first communication unit and the second communication unit establish communication connection, the sending of the synchronization pulse includes the following scenarios: the second scenario is that when the differential device a starts to start and sends a synchronous pulse output request to the communication unit a, the differential protection device B is started, so that the communication unit a completes pulse synchronous sending negotiation with the communication unit B through one handshake; the third scenario is that when the differential protection device a starts to start and sends a synchronization pulse output request to the communication unit a, the differential protection device B is also started, so that the communication unit a needs to perform a periodic handshake to complete the pulse synchronization transmission negotiation with the communication unit B.
In one embodiment, as shown in fig. 1 (e), a timing diagram of the transmission of the synchronization pulse in the second scenario is shown. The communication unit a may send the first working state of itself to the differential protection device a, and the specific sending mode may be an active mode in 2.11, or may be passive sending when the query request of the differential protection device a is obtained in 3.11 and 4.11. 5.11 the differential protection device a also transmits its second working state to the communication unit a when determining that the communication unit a has established a communication connection according to the obtained first working state, and the communication unit a also stores the second working state of the differential protection device a locally. The communication unit B and the differential protection device B also perform status transmission, and the principle is similar to that of the communication unit a and the differential protection device a, so that the description thereof is omitted in this embodiment. 6.1 the differential protection device a sends a synchronization pulse output request to the already-opened communication unit a, and the communication unit a generates a start synchronization pulse output command according to the synchronization pulse output request. 7.1 the communication unit A sends the generated starting synchronous pulse output instruction to the communication unit B;8.11 communication unit a determines that a synchronization pulse determination message fed back by communication unit B is received, and includes a designated output slot of the synchronization pulse in the synchronization pulse determination message, for example, t=a, which indicates that communication unit B and communication unit a agree to start transmitting the synchronization pulse to the differential protection device connected to each other at slot a. 9.1 communication unit a will send an acknowledgement message to communication unit B to inform communication unit B that the message was successfully received; 10.11 the communication unit a will inform the differential protection device a that the request can be performed; 11.11 communication unit a sends a synchronization pulse to differential protection device a in the agreed time slot t=a. In this embodiment, the description is given taking the case that the differential protection device a transmits the synchronization pulse output request, and the communication unit a transmits the synchronization pulse as an example, and the process that the differential protection device B transmits the synchronization pulse output request and the communication unit B transmits the synchronization pulse is substantially the same as the above-mentioned process, so that the description is omitted in this embodiment.
In one embodiment, as shown in fig. 1 (f), a timing diagram of the transmission of the synchronization pulse in the third scenario is shown. The third scenario is substantially the same as the second scenario in the pulse transmission manner, and the main difference is that after the 7.1 communication unit a transmits the pulse output instruction to the communication unit B, the communication unit B determines that the differential protection device B is not turned on by querying the working state of the differential protection device B stored locally, and then does not feed back a determination message to the communication unit a, so that the corresponding differential protection device obtains a confirmation response of the non-communication unit a, at this time, the differential protection device a periodically tries to continue to initiate the synchronous pulse output request until receiving the response, at this time, the differential protection device B is already turned on, and then continues to perform pulse transmission according to the condition of the first scenario.
It should be noted that, if the communication link between the communication unit a and the communication unit B is interrupted, the communication unit a in the present embodiment actively reports the current state to the differential protection device a, and stops pulse transmission at the same time; after the communication link with the communication unit B is restored, the current new state will be reported to the differential protection device a, and the differential protection device a decides whether to restart the communication unit a to output the synchronization pulse. Similarly, in the case where the communication link of the communication unit B is interrupted, the operation principle is substantially the same as that of the communication unit a, and thus, a detailed description is omitted in this embodiment.
Step 102, receiving second message data sent by the second differential protection device through the second communication unit.
Specifically, for the first scene, the second scene and the third scene, the differential protection device a and the differential protection device b can realize a counting function by detecting synchronous pulses, and the counting is marked as a serial number in the acquired message data; meanwhile, synchronous correction of counting errors is realized by detecting and identifying synchronous pulses, for example, counting statistics are cleared after each time of receiving 1 wide pulse of 1000ms, so that the accuracy is not affected by continuous system error accumulation and sampling timing and counting are achieved; in addition, by detecting and identifying the synchronous pulse, the differential protection device a and the differential protection device b can finish 1ms synchronous signal counting based on stable narrow pulse signals in each wide pulse period, and can finish counting based on a high-precision clock of a message collection system of the differential protection device; and combining the wide pulse period counting to form composite counting statistics, and marking the composite counting statistics as sequence numbers in the acquired message data.
Specifically, after the differential protection device B acquires the synchronization pulse, data is acquired based on the synchronization pulse, and the formed message data is sent to the communication unit B, so that the communication unit a indirectly acquires the second message data sent by the differential protection device B through the communication unit B after sending the synchronization pulse.
Step 103, sending the second message data to the first differential protection device, so that the first differential protection device performs differential protection on the detection circuit according to the collected first message data and the received second message data.
Optionally, sending the second message data to the first differential protection device, so that the first differential protection device performs differential protection on the detection circuit according to the collected first message data and the received second message data, and may include: and sending the second message data containing the counting marks to the first differential protection device, so that the first differential protection device calculates the difference value of sampling data corresponding to the first data sampling sequence number in the first message data and the second message data when determining that the difference value of the second output times and the first output times does not exceed a time threshold value, and determines that the detection circuit is abnormal and disconnects the detection circuit when the difference value exceeds the value threshold value.
Optionally, the method may further comprise: receiving first message data sent by a first differential protection device; and sending the first message data to a second differential protection device so that the second differential protection device performs differential protection on the detection circuit according to the acquired second message data and the received first message data.
It should be noted that, since the functions of the communication unit a and the communication unit B in the present embodiment are substantially the same, the communication unit a also acquires the first message data acquired by the differential protection device a, and therefore, after the communication unit B transmits the synchronization pulse, the communication unit a indirectly acquires the first message data transmitted by the differential protection device a. Since the principle of differential protection performed by the differential protection device b according to the message data is substantially the same as that of the differential protection device a, the description thereof is omitted in this embodiment.
According to the technical scheme of the embodiment of the invention, the communication unit sends the synchronous pulse to the connected differential protection device, automatic timing synchronization is realized under the condition of no external equipment, and the differential protection devices at the two ends of the detection line directly realize the transmission of message data through the connected communication unit, so that the transmission delay and jitter interval are reduced, and the requirement of a user on differential protection is met.
Example two
Fig. 2 is a flowchart of a differential protection method according to an embodiment of the present invention, which is based on the above embodiment, and in this embodiment, a process of performing differential protection according to message data in step 103 of one embodiment is specifically described. Correspondingly, the method of the embodiment specifically comprises the following operations:
step 201, establishing a wireless communication connection with the second communication unit and transmitting a synchronization pulse to the first differential protection device.
Optionally, the first differential protection device and the second differential protection device are in an operating state before the first communication unit and the second communication unit establish communication connection; establishing a communication connection with the second communication unit and transmitting a synchronization pulse to the first differential protection device may include: after communication connection is established with the second communication unit, the synchronization pulse is directly sent to the first differential protection device.
Optionally, the first differential protection device and the second differential protection device are not in an operating state before the first communication unit and the second communication unit establish communication connection; establishing a communication connection with the second communication unit and transmitting a synchronization pulse to the first differential protection device may include: establishing a communication connection with a second communication unit; generating a start synchronization pulse output instruction in response to detecting a synchronization pulse output request from the first differential protection device; and sending a start synchronous pulse output instruction to the second communication unit, and sending synchronous pulses to the first differential protection device according to the designated output time slot of the synchronous pulses fed back by the second communication unit.
Step 202, receiving second message data sent by the second differential protection device through the second communication unit.
Step 203, send the second message data including the count mark to the first differential protection device, so that when the first differential protection device determines that the difference between the second output times and the first output times does not exceed the time threshold, calculate the difference between the first message data and the sampling data corresponding to the second data sampling times in the second message data, and when the difference exceeds the value threshold, determine that the detection circuit is abnormal, and disconnect the detection circuit.
Optionally, the first message data and the second message data respectively include a count mark; the first message data includes a first count mark, where the first count mark includes: the first differential protection device acquires a first output frequency of the synchronous pulse and a first data sampling sequence number recorded by the first differential protection device; the second message data includes a second count mark, where the second count mark includes: the second output times of the synchronous pulse acquired by the second differential protection device and the second data sampling sequence number recorded by the second differential protection device.
Specifically, the count flag included in the second packet acquired by the communication unit a is (100 90), where 100 refers to the second output number of the synchronization pulse acquired by the differential protection device b, and may be used to indicate the number of wide pulses acquired by the differential protection device b, and 90 refers to the second data acquisition number recorded by the differential protection device b when receiving 100 pulses, that is, indicates that the current is the 90 th sampling data. The communication unit a sends the acquired second message data to the differential protection device a, and the count mark contained in the first message data acquired by the differential protection device a when the second message is acquired is 105, and the data acquired by the differential protection device is directly transmitted to the differential protection device a through the communication unit, but there is still transmission delay, but the transmission delay is significantly reduced compared with that of the public network system by an operator. The differential protection device a calculates the difference between the second output times and the first output times, determines the difference to be 5ms, and since the set time threshold is 10ms, the jitter time delay is within the allowable range, so that it can be determined that the received message data meets the time delay requirement. Under the condition that the delay requirement is met, the differential protection device a can acquire 95 th sampling data from the local historical sampling data and compare the 95 th sampling data with the 95 th sampling data contained in the second message data, and the set numerical threshold can be specifically 1, so that when the difference value of the data acquired by the differential protection device a and the differential protection device b with the same serial number is greater than 1, the detection circuit is determined to be abnormal, and the differential protection device a breaks the detection circuit to protect the circuit. Since the protection principle of the differential protection device b is substantially the same as that of the differential protection device a, the description thereof will not be repeated in this embodiment.
According to the technical scheme of the embodiment of the invention, the communication unit sends the synchronous pulse to the connected differential protection device, automatic timing synchronization is realized under the condition of no external equipment, and the differential protection devices at the two ends of the detection line directly realize the transmission of message data through the connected communication unit, so that the transmission delay and jitter interval are reduced, and the requirement of a user on differential protection is met.
Example III
Fig. 3 is a schematic structural diagram of a differential protection device according to a third embodiment of the present invention, where the device includes:
A synchronization pulse transmitting module 301, configured to establish a wireless communication connection with a second communication unit and transmit a synchronization pulse to a first differential protection device, where the second communication unit synchronously transmits the synchronization pulse to the second differential protection device, and the first differential protection device and the second differential protection device are disposed at two ends of a detection line;
The message data transmission module 302 is configured to receive second message data sent by the second differential protection device through the second communication unit;
The differential protection module 303 is configured to send the second message data to the first differential protection device, so that the first differential protection device performs differential protection on the detection circuit according to the collected first message data and the received second message data.
The device can execute the differential protection method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be found in the method provided by any embodiment of the present invention.
Optionally, the first differential protection device and the second differential protection device are in an operating state before the first communication unit and the second communication unit establish communication connection;
the synchronization pulse transmitting module 301 is configured to directly transmit a synchronization pulse to the first differential protection device after establishing a communication connection with the second communication unit.
Optionally, the first differential protection device and the second differential protection device are not in an operating state before the first communication unit and the second communication unit establish communication connection; the synchronization pulse transmission module 301 includes:
The communication connection sub-module is used for establishing communication connection with the second communication unit;
The starting synchronous pulse output instruction generation module is used for responding to the detection of the synchronous pulse output request from the first differential protection device and generating a starting synchronous pulse output instruction;
And the synchronous pulse transmitting submodule is used for transmitting a synchronous pulse starting output instruction to the second communication unit and transmitting synchronous pulses to the first differential protection device according to the designated output time slot of the synchronous pulses fed back by the second communication unit.
Optionally, the synchronization pulse sending submodule is configured to send a start synchronization pulse output instruction to the second communication unit, determine whether a synchronization pulse determination message fed back by the second communication unit is received, where the synchronization pulse determination message includes a designated output time slot of the synchronization pulse,
If yes, sending a confirmation response message to the second communication unit, and sending a synchronization pulse to the first differential protection device in a designated output time slot, wherein the second communication unit synchronously sends the synchronization pulse to the second differential protection device in the designated output time slot;
otherwise, sending a synchronization pulse output request invalidation message to the first differential protection device, receiving a synchronization pulse output request periodically generated by the first differential protection device according to the output request invalidation message until the synchronization pulse determination message fed back by the second communication unit is determined to be received, sending a confirmation response message to the second communication unit, and sending a synchronization pulse to the first differential protection device in a designated output time slot.
Optionally, the device further includes a status transmission module, configured to send the first operating status of the first communication unit to the first differential protection device;
receiving a second working state of the first differential protection device;
and storing the second working state of the first differential protection device locally.
Optionally, the apparatus further comprises: the first message data transmission device is used for receiving the first message data sent by the first differential protection device;
and sending the first message data to a second differential protection device so that the second differential protection device performs differential protection on the detection circuit according to the acquired second message data and the received first message data.
Optionally, the first message data and the second message data respectively include a count mark;
The first message data includes a first count mark, where the first count mark includes: the first differential protection device acquires a first output frequency of the synchronous pulse and a first data sampling sequence number recorded by the first differential protection device;
The second message data includes a second count mark, where the second count mark includes: the second output times of the synchronous pulse acquired by the second differential protection device and the second data sampling sequence number recorded by the second differential protection device.
Optionally, the differential protection module 303 is configured to send second packet data including a count flag to the first differential protection device, so that when the first differential protection device determines that the difference between the second output times and the first output times does not exceed a time threshold, calculate a difference between the first packet data and sampling data corresponding to the second data sampling times in the second packet data, and determine that an abnormality exists in the detection line and disconnect the detection line when the difference exceeds a numerical threshold.
Example IV
Fig. 4 is a schematic structural diagram of a communication unit according to an embodiment of the present invention. Fig. 4 illustrates a block diagram of an exemplary communication unit 412 suitable for use in implementing embodiments of the invention. The communication unit 412 shown in fig. 4 is only an example and should not impose any limitation on the functionality and scope of use of embodiments of the present invention.
As shown in fig. 4, the communication unit 412 is in the form of a general purpose computing communication unit. The components of communication unit 412 may include, but are not limited to: one or more processors 416, a memory 428, a bus 418 that connects the various system components (including the memory 428 and the processor 416).
Bus 418 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures. By way of example, and not limitation, such architectures include Industry Standard Architecture (ISA) bus, micro channel architecture (MAC) bus, enhanced ISA bus, video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
Communication unit 412 typically includes a variety of computer system readable media. Such media can be any available media that is accessible by communication unit 412 and includes both volatile and nonvolatile media, removable and non-removable media.
Memory 428 is used to store instructions. Memory 428 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 430 and/or cache memory 432. The communication unit 412 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 434 may be used to read from or write to non-removable, nonvolatile magnetic media (not shown in FIG. 4, commonly referred to as a "hard disk drive"). Although not shown in fig. 4, a magnetic disk drive for reading from and writing to a removable non-volatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading from or writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In such cases, each drive may be coupled to bus 418 via one or more data medium interfaces. Memory 428 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of embodiments of the invention.
A program/utility 440 having a set (at least one) of program modules 442 may be stored in, for example, memory 428, such program modules 442 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules 442 generally perform the functions and/or methodologies in the described embodiments of the invention.
The communication unit 412 may also communicate with one or more external communication units 414 (e.g., keyboard, pointing communication unit, display 424, etc.), with one or more communication units that enable a user to interact with the communication unit 412, and/or with any communication unit (e.g., network card, modem, etc.) that enables the communication unit 412 to communicate with one or more other computing communication units. Such communication may occur through an input/output (I/O) interface 422. Also, the communication unit 412 may communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN) and/or a public network, such as the Internet, through the network adapter 420. As shown, network adapter 420 communicates with other modules of communications unit 412 via bus 418. It should be appreciated that although not shown in fig. 4, other hardware and/or software modules may be used in connection with communication unit 412, including, but not limited to: microcode, communication unit drives, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
The processor 416 executes instructions stored in the memory 428 to perform various functional applications and data processing, such as implementing the differential protection methods provided by embodiments of the present invention: establishing wireless communication connection with a second communication unit and sending a synchronization pulse to a first differential protection device, wherein the second communication unit synchronously sends the synchronization pulse to the second differential protection device, and the first differential protection device and the second differential protection device are arranged at two ends of a detection circuit; receiving second message data sent by a second differential protection device through a second communication unit; and sending the second message data to the first differential protection device so that the first differential protection device performs differential protection on the detection circuit according to the acquired first message data and the received second message data.
Example five
A fifth embodiment of the present application provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the differential protection method as provided by all the embodiments of the present application:
Establishing wireless communication connection with a second communication unit and sending a synchronization pulse to a first differential protection device, wherein the second communication unit synchronously sends the synchronization pulse to the second differential protection device, and the first differential protection device and the second differential protection device are arranged at two ends of a detection circuit; receiving second message data sent by a second differential protection device through a second communication unit; and sending the second message data to the first differential protection device so that the first differential protection device performs differential protection on the detection circuit according to the acquired first message data and the received second message data.
Any combination of one or more computer readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present invention may be written in one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. A differential protection method applied to a first communication unit, comprising:
Establishing wireless communication connection with a second communication unit and sending a synchronization pulse to a first differential protection device, wherein the second communication unit synchronously sends the synchronization pulse to a second differential protection device, and the first differential protection device and the second differential protection device are arranged at two ends of a detection circuit;
receiving second message data sent by the second differential protection device through the second communication unit;
The second message data is sent to the first differential protection device, so that the first differential protection device performs differential protection on a detection circuit according to the collected first message data and the received second message data;
the first differential protection device and the second differential protection device are not in a working state before the first communication unit and the second communication unit are in communication connection;
The establishing communication connection with the second communication unit and sending a synchronization pulse to the first differential protection device includes:
establishing a communication connection with the second communication unit;
Generating a start synchronization pulse output command in response to detecting a synchronization pulse output request from the first differential protection device;
Transmitting the start synchronization pulse output instruction to the second communication unit, and transmitting the synchronization pulse to the first differential protection device according to the designated output time slot of the synchronization pulse fed back by the second communication unit;
The sending the start synchronization pulse output instruction to the second communication unit, and sending the synchronization pulse to the first differential protection device according to a designated output time slot of feedback of the second communication unit, including:
Sending the start synchronization pulse output instruction to the second communication unit, judging whether a synchronization pulse determination message fed back by the second communication unit is received or not, wherein the synchronization pulse determination message comprises a designated output time slot of the synchronization pulse,
If yes, sending a confirmation response message to the second communication unit, and sending the synchronization pulse to the first differential protection device in the appointed output time slot, wherein the second communication unit synchronously sends the synchronization pulse to the second differential protection device in the appointed output time slot;
Otherwise, sending a synchronization pulse output request invalidation message to the first differential protection device, receiving a synchronization pulse output request periodically generated by the first differential protection device according to the output request invalidation message until the synchronization pulse determination message fed back by the second communication unit is determined to be received, sending a confirmation response message to the second communication unit, and sending the synchronization pulse to the first differential protection device in the appointed output time slot.
2. The method of claim 1, wherein the first differential protection device and the second differential protection device are in an operational state prior to the first communication unit establishing a communication connection with the second communication unit;
The establishing communication connection with the second communication unit and sending a synchronization pulse to the first differential protection device includes:
and after the communication connection is established with the second communication unit, the synchronous pulse is directly sent to the first differential protection device.
3. The method of claim 1, wherein, in response to detecting a synchronization pulse output request from the first differential protection device, prior to generating a start synchronization pulse output command, further comprising:
Transmitting a first operating state of a first communication unit to the first differential protection device;
receiving a second working state of the first differential protection device;
And storing the second working state of the first differential protection device locally.
4. The method according to claim 1, wherein the method further comprises:
receiving the first message data sent by the first differential protection device;
and sending the first message data to the second differential protection device, so that the second differential protection device performs differential protection on the detection circuit according to the acquired second message data and the received first message data.
5. The method of claim 1, wherein the first message data and the second message data each include a count flag;
The first message data includes a first count mark, where the first count mark includes: the first output times of the synchronous pulse obtained by the first differential protection device and the first data sampling time sequence number recorded by the first differential protection device;
The second message data includes a second count mark, where the second count mark includes: the second output times of the synchronous pulse acquired by the second differential protection device and the second data sampling sequence number recorded by the second differential protection device.
6. The method of claim 5, wherein transmitting the second message data to the first differential protection device to cause the first differential protection device to differentially protect the detection circuit based on the collected first message data and the received second message data, comprises:
And sending the second message data containing the counting marks to the first differential protection device, so that the first differential protection device calculates the difference value of sampling data corresponding to the second data sampling sequence numbers in the first message data and the second message data when determining that the difference value of the second output times and the first output times does not exceed a time threshold value, and determines that the detection circuit is abnormal and disconnects the detection circuit when the difference value exceeds the value threshold value.
7. A differential protection device, comprising:
The synchronous pulse transmitting module is used for establishing wireless communication connection with the second communication unit and transmitting synchronous pulses to the first differential protection device, wherein the second communication unit synchronously transmits the synchronous pulses to the second differential protection device, and the first differential protection device and the second differential protection device are arranged at two ends of a detection line;
The message data transmission module is used for receiving second message data sent by the second differential protection device through the second communication unit;
The differential protection module is used for sending the second message data to the first differential protection device so that the first differential protection device performs differential protection on the detection circuit according to the collected first message data and the received second message data;
The synchronous pulse sending module comprises a communication connection sub-module, a synchronous pulse starting output instruction generating module and a synchronous pulse sending sub-module;
The communication connection sub-module is used for establishing communication connection with the second communication unit;
The start synchronous pulse output instruction generation module is used for responding to the detection of the synchronous pulse output request from the first differential protection device and generating a start synchronous pulse output instruction;
The synchronous pulse transmitting submodule is used for transmitting a synchronous pulse starting output instruction to the second communication unit and transmitting synchronous pulses to the first differential protection device according to the designated output time slot of the synchronous pulses fed back by the second communication unit;
The synchronous pulse transmitting submodule is used for transmitting a synchronous pulse starting output instruction to the second communication unit and judging whether a synchronous pulse determining message fed back by the second communication unit is received or not, wherein the synchronous pulse determining message comprises a designated output time slot of synchronous pulse,
If yes, sending a confirmation response message to the second communication unit, and sending a synchronization pulse to the first differential protection device in a designated output time slot, wherein the second communication unit synchronously sends the synchronization pulse to the second differential protection device in the designated output time slot;
otherwise, sending a synchronization pulse output request invalidation message to the first differential protection device, receiving a synchronization pulse output request periodically generated by the first differential protection device according to the output request invalidation message until the synchronization pulse determination message fed back by the second communication unit is determined to be received, sending a confirmation response message to the second communication unit, and sending a synchronization pulse to the first differential protection device in a designated output time slot.
8. A communication unit, the communication unit comprising:
One or more processors;
A storage means for storing one or more programs;
when executed by the one or more processors, causes the one or more processors to implement the method of any of claims 1-6.
9. A computer storage medium having stored thereon a computer program, which when executed by a processor performs the method according to any of claims 1-6.
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