A relay protection remote control system and method based on message and file double checking

Abstract

The application relates to the technical field of power grid control, in particular to a relay protection remote control system and method based on message and file double checking, which comprises a master station EMS module, a master station signal protection module, a substation remote module, a substation signal protection substation module and a relay protection device; the master station EMS module is used for remote operation of soft pressboard switching, setting value area switching and signal reset of the relay protection device through a remote channel; the master station signal protection module is used for remote operation of the relay protection device; the substation remote module is used for remote operation of the relay protection device; the substation signal protection substation module is used for remote operation of the relay protection device; and the relay protection device is used for remote operation. Through cooperation of the master station EMS module, the master station signal protection module, the substation remote module, the substation signal protection substation module and the relay protection device, the accuracy and reliability of remote operation of the relay protection device can be ensured, thereby effectively ensuring safe and stable operation of the power grid; meanwhile, since remote operation is realized, the workload of operation and maintenance personnel can be greatly reduced, and work efficiency is improved; in addition, through the message and file double checking mode, the accuracy and safety of operation can be further improved, and operation and maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power grid control, and particularly relates to a relay protection remote control system and method based on message and file double checking. BACKGROUND

[0002] The relay protection remote control is an important function in the power system, and remote devices and communication devices are used to remotely operate circuit breakers in power plants and transformer substations. At present, the relay protection remote control mode is usually the remote tripping type protection. When overvoltage or line fault occurs in the extra-high voltage power grid, the remote tripping protection of the local protection is started at the same time when the local protection is tripped, and a signal is sent to the opposite side through a high-frequency channel to trip the circuit breaker of the opposite side and lock the reclosing thereof.

[0003] However, since the remote tripping type protection relies on a dedicated channel to transmit the tripping instruction, the quality and reliability of the channel directly affect the performance of the protection. Once the channel fails or is interrupted, the remote tripping function will be invalid, and manual intervention is required, which affects the efficiency of the relay protection work and increases the operation and maintenance cost. Therefore, we need to propose a relay protection remote control system and method based on message and file double checking to solve the above problems, so that the relay protection remote operation can be realized, the safe and stable operation of the power grid can be ensured, the work efficiency can be effectively improved, and the operation and maintenance cost can be reduced. SUMMARY

[0004] In view of the above problems, the application provides a relay protection remote control system based on message and file double checking, which comprises a master station EMS module. The master station EMS module is used to remotely operate the soft pressure plate of the relay protection device, the value area switching and the signal reset through a remote channel.

[0005] A master station protection signal module is used to remotely operate the value modification of the relay protection device through a protection signal channel. The master station EMS module and the master station protection signal module are electrically connected.

[0006] A transformer station remote module is used to correctly and completely forward the relevant remote operation instructions of the master station EMS module to the controlled relay protection device.

[0007] A transformer station protection signal sub-station module is used to correctly and completely forward the relevant remote operation instructions of the master station protection signal module to the controlled relay protection device.

[0008] A relay protection device is used to protect the stable operation of the power system.

[0009] The main station EMS module is electrically connected with a substation remote module, the main station signal maintenance module is electrically connected with a substation signal maintenance substation module, and the substation remote module and the substation signal maintenance substation module are both electrically connected with a relay protection device.

[0010] Further, the process of the main station EMS module performing the switching operation of the soft panel of the relay protection device through the remote channel includes a selection process, an execution process and a cancellation process.

[0011] The execution process is that the main station EMS module sends a remote execution command to the substation remote module, and the substation remote module returns a remote execution result response to the main station EMS module after receiving the remote execution command.

[0012] The cancellation process is that the main station EMS module sends a remote cancellation command to the substation remote module, and the substation remote module returns a remote cancellation result response to the main station EMS module after receiving the remote cancellation command.

[0013] Further, the process of the main station EMS module switching the setting value area of the relay protection device through the remote channel is as follows.

[0014] A1, the main station EMS module constructs a remote setting point command message according to the DL / T634.5104 protocol;

[0015] A2, the main station EMS module sends the constructed remote setting point command message to the corresponding relay protection device through the remote channel;

[0016] A3, the relay protection device receives the message and analyzes and verifies the message;

[0017] A4, if the verification is passed, the relay protection device performs the setting value area switching operation, and the relay protection device switches its running setting value area to the setting value area number specified in the message; during the switching process, the related parameters are updated and reconfigured to adapt to the new setting value area setting;

[0018] A5, after the relay protection device completes the setting value area switching, the relay protection device returns a remote setting point command execution result message to the main station EMS module; the execution result message contains information about whether the switching is successful, if successful, the main station EMS module confirms that the setting value area switching operation is completed; if failed, the main station EMS module further analyzes and processes according to the returned error information.

[0019] Further, the main station EMS module resets the signal of the relay protection device through the remote channel when performing remote operation, and the reset operation includes a reset selection process and a reset execution process. In the reset selection process, the main station EMS module sends a remote control command with selection to the substation remote module, and the substation remote module returns a remote control selection result response to the main station EMS module after receiving the remote control instruction. In the reset execution process, the main station EMS module sends a remote control command with execution to the substation remote module, and the substation remote module returns a remote control execution result response to the main station EMS module after receiving the remote control instruction.

[0020] Further, the main station protection signal module performs remote operation on the setting value of the relay protection device, including a control process of reading the setting value of an arbitrary area, a control process of modifying the setting value of a non-operating setting value area, and a control process of modifying the setting value of an operating setting value area.

[0021] Further, the control process of reading the setting value of an arbitrary area is as follows:

[0022] B11, an operator issues a reading instruction of the setting value to the main station protection signal module according to the relevant identification information of the relay protection device and the specified setting value area number, the main station protection signal module constructs a request message for reading the setting value of an arbitrary area according to the instruction information in a predetermined communication protocol format, and sends the request message to the substation protection signal sub-module through the protection signal channel;

[0023] B12, after receiving the reading request message of the setting value from the main station protection signal module, the substation protection signal sub-module checks the message and checks whether the message format is correct, and whether there is a transmission error, if the check is correct, the reading request message of the setting value is forwarded to the corresponding relay protection device without change, if the message is found to be incorrect, an error prompt message is returned to the main station protection signal module to inform it that the forwarding is abnormal;

[0024] B13, after receiving the reading request message of the setting value, the relay protection device verifies the legality of the request message, confirms that it is from an authorized main station and meets its own communication requirements, and after verification, extracts the corresponding setting value data from the corresponding storage area according to the setting value area number specified in the request message, organizes and packages the setting value data according to the communication protocol requirements to form a setting value response message that can be returned, and then sends the setting value response message back to the substation protection signal sub-module through the station link;

[0025] B14, after receiving the setting value response message returned by the relay protection device, the substation protection signal sub-module checks the integrity and accuracy of the setting value response message again to ensure that the data is not error during the station transmission process, and after the check is qualified, the setting value response message is forwarded back to the main station protection signal module through the protection signal channel;

[0026] B15, the main station protection module receives the fixed value response message forwarded back by the substation protection module, parses the fixed value response message according to the communication protocol, extracts the fixed value data contained therein, and displays the fixed value data on the operation interface.

[0027] Further, the control process for modifying the fixed value in the non-operation fixed value area is as follows:

[0028] B21, the main station protection module generates a fixed value modification message according to the detailed information of the relay protection device to be modified, the target non-operation fixed value area number, and the specific new fixed value content, and sends the fixed value modification message to the substation protection module through the protection channel;

[0029] B22, after the substation protection module receives the fixed value modification message from the main station protection module, it checks the fixed value modification message, including whether the fixed value modification message is compliant and whether the data check code is correct. If the check is passed, the fixed value modification message is forwarded to the relay protection device. If the check is not passed, a fixed value modification message with specific error reasons is returned to the main station protection module, and it is informed that the request cannot be executed;

[0030] B23, after the relay protection device receives the fixed value modification request message, it also verifies the legality of the message. After confirming that there is no error, it extracts the new fixed value data in the message and writes it into the corresponding non-operation fixed value area;

[0031] B24, after the fixed value is updated, the relay protection device generates a fixed value modification result feedback message, which indicates whether the fixed value modification is successful. If it is successful, the corresponding success flag bit is set, and some simple operation record information is attached. If it fails, the reason for the failure is specified in the fixed value modification result feedback message. Subsequently, the relay protection device sends the fixed value modification result feedback message to the substation protection module through the station link;

[0032] B25, after the substation protection module receives the fixed value modification result feedback message from the relay protection device, it checks the fixed value modification result feedback message and forwards it back to the main station protection module. After receiving the fixed value modification result feedback message, the main station protection module determines whether the fixed value modification operation is successful according to the content in the fixed value modification result feedback message. If it is successful, it prompts the operator that the modification has been completed and updates the relevant fixed value record information. If it fails, it displays the specific failure reason to the operator.

[0033] Further, the control process for modifying the fixed value in the non-operation fixed value area is as follows:

[0034] B31, After the operator initiates the operation instruction of modifying the operating setting value area in the main station, the main station first evaluates the current operating state of the entire power system to determine whether the conditions for switching the operating setting value area are met, and determines the target setting value area number, and confirms that the information is correct, and then the main station constructs a pre-request message for switching the operating setting value area according to the communication protocol, and sends the message to the substation through the communication channel.

[0035] B32, After the substation receives the pre-request message, the pre-request message is checked, and if the check is passed, it is forwarded to the relay protection device. After receiving the pre-request message, the relay protection device comprehensively checks the current operating state to determine whether the conditions for switching the operating setting value area are met. If the conditions are met, the relay protection device performs the corresponding locking operation, and then returns a confirmation message allowing switching to the substation. If the conditions are not met, a message is returned with detailed reasons not allowing switching.

[0036] B33, After the substation receives the confirmation message returned by the relay protection device, it is forwarded back to the main station. After receiving the confirmation message, the main station organizes the new setting value data into a setting value modification message through strict checking and format arrangement, and sends it to the substation through the communication channel. The substation then forwards it to the relay protection device. After receiving the new setting value data, the relay protection device starts writing it to the original operating setting value area.

[0037] B34, After the operating setting value area is switched, the relay protection device performs an unlocking operation to restore the related protection function output settings that were locked for switching the setting value area, and generates a feedback message containing the setting value modification success and unlocking completion information, which is sent to the substation through the station link. The substation checks and forwards it to the main station.

[0038] B35, After receiving the feedback message, the main station confirms that the operating setting value area has been successfully modified and the related protection function has been restored to normal, updates the operating setting value information and device state information of the relay protection device recorded by the main station, and prompts the operator on the operation interface that the operation is successful. At the same time, the data involved in the entire operation process is stored and archived.

[0039] Further, the substation remote module forwards the remote operation instruction issued by the main station EMS module as follows:

[0040] C1, Receive the remote operation instruction issued by the main station EMS module through the remote channel, and use the verification formula to verify the remote operation instruction. The verification formula is as follows:

[0041] R(x) = M(x) * x n-k + r(x), wherein R(x) is a generating polynomial, M(x) is an information polynomial, n is the degree of the generating polynomial R(x), k is the degree of M(x), and r(x) is a remainder polynomial;

[0042] C2, if the check fails, sending error information to the master station EMS module to request retransmission instructions; if the check passes, entering C3;

[0043] C3, analyzing the instructions that pass the test, extracting the key information therein, the key information including the operation object, the operation type and the related parameters, and preprocessing the instructions according to the key information;

[0044] C4, according to the operation object information obtained by analysis, accurately forwarding the preprocessed instructions to the corresponding controlled relay protection device;

[0045] C5, after the relay protection device completes the operation, the operation result is fed back to the substation remote module;

[0046] C6, the operation result and the related process information are recorded in the local log file or database; at the same time, a corresponding report is generated according to the operation result, and the main station EMS module is fed back through the remote channel to inform whether the operation is successful and the related detailed information.

[0047] Based on the above description, a relay protection remote control system based on message combined with file double checking is provided, and a relay protection remote control method based on message combined with file double checking is also provided, comprising the following steps:

[0048] S1, the master station EMS module or the master station relay protection module generates a remote operation instruction, and sends it to the substation through the remote channel or the relay protection channel;

[0049] S2, the substation remote module or the substation relay protection substation module receives the instruction and performs preliminary message analysis and checking; after the checking passes, the instruction is forwarded to the controlled relay protection device;

[0050] S3, the relay protection device receives the instruction and performs secondary checking at the message level to ensure the correctness of the instruction;

[0051] S4, for the value modification remote operation, the master station relay protection module generates a file containing detailed value information, and sends it to the substation relay protection substation module through the relay protection channel;

[0052] S5, the substation relay protection substation module receives the file and performs integrity checking and format checking of the file; after the checking passes, the file is forwarded to the controlled relay protection device;

[0053] S6, the relay protection device receives the file and carries out secondary verification at the file level, the secondary verification at the file level includes correctness, integrity of the file content and whether it is consistent with the current system state;

[0054] S7, after the message and the file are verified, the relay protection device executes the remote operation instruction, the remote operation instruction includes soft pressure plate switching, value area switching, signal reset or value modification;

[0055] S8, during the execution process, the relay protection device needs to carry out real-time state monitoring and fault detection to ensure the safety and effectiveness of the operation;

[0056] S9, after the relay protection device executes the operation, the operation result feedback is sent to the substation security substation module or the substation remote module;

[0057] S10, the substation security substation module or the substation remote module receives the feedback and carries out corresponding processing or recording;

[0058] S11, the main station EMS module or the main station security module confirms whether the remote operation is successfully completed according to the feedback result.

[0059] The beneficial effects of the present application are:

[0060] 1, by cooperation of the main station EMS module, the main station security module, the substation remote module, the substation security substation module and the relay protection device, the present application can ensure the accuracy and reliability of the relay protection remote operation, thereby effectively ensuring the safe and stable operation of the power grid, at the same time, since the remote operation is realized, the workload of the operation and maintenance personnel can be greatly reduced, the work efficiency is improved, in addition, by the message combined with the file double-checking mode, the accuracy and safety of the operation can be further improved, and the operation and maintenance cost is reduced.

[0061] 2, by setting of the main station security module, the present application can realize the value modification remote operation of the relay protection device through the security channel, the value modification is an important means of function adjustment of the relay protection device, and the device can still provide effective protection when the power system changes.

[0062] 3, by setting of the main station EMS module, the present application can carry out the soft pressure plate switching, the value area switching and the signal reset remote operation of the relay protection device through the remote channel.

[0063] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure indicated in the specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0064] In order to make the technical solutions of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative work based on the embodiments of the present application are within the protection scope of the present application.

[0065] Figure 1 A control system schematic diagram according to an embodiment of the present application is shown;

[0066] Figure 2 A relay protection device setting value area switching flow chart according to an embodiment of the present application is shown;

[0067] Figure 3 A control flow chart for reading arbitrary area setting values according to an embodiment of the present application is shown;

[0068] Figure 4 A substation remote module forwarding flow chart for forwarding remote operation instructions issued by a main station EMS module according to an embodiment of the present application is shown;

[0069] Figure 5 A control method flow chart according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0070] In order to make the technical solutions of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative work based on the embodiments of the present application are within the protection scope of the present application.

[0071] The embodiment of the present application provides a relay protection remote control system based on message and file double checking, like Figures 1-4The substation remote module and the relay protection device adopt the fixed value service of the DL / T860 protocol, the substation protection substation module and the relay protection device adopt the fixed value service of the DL / T860 protocol, and the substation remote module and the relay protection device adopt the direct control service of the DL / T860 protocol or the general command service of the substation 103 protocol.

[0072] The main station EMS module performs remote operation on the soft platen of the relay protection device through the remote channel, the fixed value area switching and the signal recovery.

[0073] The process of the main station EMS module performing the operation of putting off the soft platen of the relay protection device through the remote channel includes a selection process, an execution process and a cancellation process, wherein the selection process is that the main station EMS module sends a remote control selection command to the substation remote module, the object is a soft platen item to be remotely controlled, the target value is a soft platen target value, the control command of the substation remote module to the relay protection device is SBOw_req[FC=C0], the substation remote module returns a remote control selection return message to the main station EMS module after receiving the remote control selection command, and the control command of the substation remote module to the relay protection device is SBOw_rsp[FC=C0].

[0074] The execution process is that the main station EMS module sends a remote control execution command to the substation remote module, the control command of the substation remote module to the relay protection device is oper[FC=C0], the substation remote module returns a remote control execution result response to the main station EMS module after receiving the remote control execution command, and the control command of the substation remote module to the relay protection device is oper_rsp[FC=C0].

[0075] The cancellation process is that the main station EMS module sends a remote control cancellation command to the substation remote module, the control command of the substation remote module to the relay protection device is cancel[FC=C0], the substation remote module returns a remote control cancellation result response to the main station EMS module after receiving the remote control cancellation command, and the control command of the substation remote module to the relay protection device is cancel_rsp[FC=C0].

[0076] As Figure 2 shown, the main station EMS module switches the relay protection device setting value area through the remote channel as follows:

[0077] A1, the main station EMS module constructs a remote setting point command message according to the DL / T634.5104 protocol; the message type selects a setting scale value type (i.e. C_SE_NA_1 or C_SE_NB_1 or C_SE_NC_1);

[0078] The remote setting point command message is constructed through a setting group control block, and the related attribute description of the setting group control block is as follows:

[0079] A11, NumOfSG: number of setting groups, the number of setting value areas used by the relay protection device as a device parameter, which is not allowed to be set or modified;

[0080] A12, ActSG: active setting group, the active setting area number, i.e. the current setting area number, which is obtained by the client from the device using the GetSGValues operation, and a new active setting area number is also specified using the SelectActiveSG operation (i.e. the setting value area switching operation), the value range of the current setting area number starts from 1;

[0081] A13, EditSG: edit setting group, the edit setting area number, i.e. the setting area number that is currently being modified and set, which is operated by the client using the SetSGValues or GetSGValues operation, the edit setting area number field EditSG should be initialized to 0 when the relay protection device is powered on, and the value range of the current setting area ActSG field must start from 1, 0 area indicates that the setting value is not allowed to be modified at present.

[0082] A14, CnfEdit: confirm editing, confirming the operation of editing the setting value.

[0083] A15, LActTm: last activation time, the time of the last SelectActiveSG (selecting the active setting area number, i.e. switching the setting value area) operation by the client.

[0084] Different relay protection devices in the station are distinguished by the information object address in the DL / T634.5104 protocol, which is a unique identifier for each relay protection device; the setting value is the relay protection device running setting area number, i.e. the main station determines the setting area number to be switched to according to the actual running demand and puts it into the message;

[0085] DL / T634.5104 protocol has flexible expansion performance. For the substation complying with DL / T860 standard, the mutual compatible conversion of service model is realized by substation remote module:

[0086] a) The substation remote module should preprocess the model file of the device when initializing, obtain and save, and the saved content includes the information of numofSGs, and obtain the range of set value area available for the device through numofSGs;

[0087] b) After receiving the switching selection command of the master station MES module, the substation remote module reasonably checks the target set value area number issued by the master station. If the target set value area number is reasonable, the substation remote module uses SelectActiveSG service to write the target set value area number to the ActSG field of the current set value area number domain of the device SGCB set value group control block;

[0088] c) The relay protection device receives the SelectActiveSG command of the substation remote module, performs switching set value area operation, and if the switching operation is successful, uses SelectActiveSG service to upload positive message; if the switching operation fails, uses SelectActiveSG service to upload negative message and gives error code.

[0089] A2, the master station EMS module sends the constructed remote setting point command message to the corresponding relay protection device through the remote channel;

[0090] A3, after receiving the message, the relay protection device analyzes and checks the message;

[0091] The process of analyzing and checking the message is as follows: first, check whether the message format meets the requirements of DL / T634.5104 protocol, including whether the information object address corresponds to itself, whether the message type is correct, etc., then check the legality of the set value (set value area number), and ensure that the received set value area number is within the range of set value area supported by the relay protection device;

[0092] A4, if the verification is passed, the relay protection device performs set value area switching operation, and the relay protection device switches its own running set value area to the set value area number specified in the message; during the switching process, the related parameters will be updated and reconfigured to adapt to the new set value area setting;

[0093] A5, after the relay protection device completes the setting value area switching, a remote setting point command execution result message is returned to the main station EMS module; the execution result message contains information about whether the switching is successful, if successful, the main station EMS module confirms that the setting value area switching operation is completed; if failed, the main station EMS module further analyzes and processes according to the returned error information.

[0094] The signal reset remote operation of the main station EMS module to the relay protection device through the remote channel refers to that the main station EMS module remotely resets the signal of the controlled relay protection device, and the reset operation includes a reset selection process and a reset execution process, wherein the reset selection process is that the main station EMS module sends a remote control command with selection to the substation remote module, and the substation remote module returns a remote control selection result response to the main station EMS module after receiving the selected remote control instruction; the reset execution process is that the main station EMS module sends a remote control command with execution to the substation remote module, and the substation remote module returns a remote control execution result response to the main station EMS module after receiving the executed remote control instruction.

[0095] The main station protection information module realizes the setting value modification remote operation of the relay protection device through the protection information channel.

[0096] The setting value modification remote operation of the main station protection information module to the relay protection device includes a control process of reading the setting value of an arbitrary area, a control process of modifying the setting value of a non-operating setting value area, and a control process of modifying the setting value of an operating setting value area, wherein, as shown in the figure, the control process of reading the setting value of an arbitrary area is as follows: Figure 3

[0097] B11, the operator issues a reading value instruction to the main station protection information module according to the related identification information of the relay protection device whose setting value is intended to be read and the specified setting value area number, the main station protection information module constructs a request message for reading the setting value of an arbitrary area according to the instruction information in a predetermined communication protocol format, and then sends the request message to the substation protection information sub-module through the protection information channel;

[0098] B12, after the substation protection information sub-module receives the reading value request message from the main station protection information module, the message is checked to check whether the message format is correct, and whether there is a transmission error, if the check is correct, the reading value request message is forwarded to the corresponding relay protection device without change; if the message is found to be incorrect, an error prompt message is returned to the main station protection information module to inform that the forwarding is abnormal;

[0099] ​B13, after the relay protection device receives the read setting value request message, the legality of the request message is verified first, it is confirmed that it is from the authorized master station and meets the communication requirements of itself, after the verification is passed, the corresponding setting value data is extracted from the corresponding storage area of itself according to the setting value area number specified in the request message, the setting value data is organized and packaged according to the requirements of the communication protocol, the setting value response message that can be returned is formed, and then the setting value response message is sent back to the substation protection station module through the station link;

[0100] B14, after the substation protection station module receives the setting value response message returned by the relay protection device, the integrity and accuracy of the setting value response message are checked again, it is ensured that the data has no error in the station transmission process, after the checking is qualified, the setting value response message is forwarded back to the master station protection module through the protection channel;

[0101] B15, after the master station protection module receives the setting value response message forwarded back by the substation protection station module, the setting value data contained in the setting value response message is extracted according to the communication protocol, and the setting value data is displayed on the operation interface, which is convenient for the operator to view, analyze or store in the corresponding database, so as to complete the reading of setting value of any area.

[0102] The control process of modifying the setting value of the non-operation setting value area is as follows:

[0103] B21, the master station protection module generates a setting value modification message according to the detailed information of the relay protection device to be modified, the target non-operation setting value area number and the specific new setting value content, and sends the setting value modification message to the substation protection station module through the protection channel;

[0104] B22, after the substation protection station module receives the setting value modification message of the master station protection module, the setting value modification message is checked, the checking content includes whether the setting value modification message is compliant and whether the data check code is correct, if the checking is passed, the setting value modification message is forwarded to the relay protection device, if the checking is not passed, the setting value modification message with specific error reason is returned to the master station protection module, and it is informed that the request cannot be executed;

[0105] B23, after the relay protection device receives the setting value modification request message, the legality of the message is verified first, after the confirmation is correct, the new setting value data in the message is extracted, and it is written into the corresponding non-operation setting value area, a series of internal operations such as data integrity check and storage position confirmation are performed in the writing process, so as to ensure that the new setting value can be accurately updated to the specified non-operation setting value area;

[0106] B24, after the fixed value update is completed, the relay protection device generates a fixed value modification result feedback message, which indicates whether the fixed value modification is successful. If successful, the corresponding success flag bit is set, and some simple operation record information is attached. If failed, the fixed value modification result feedback message details the reasons for failure, such as new fixed value exceeding the allowed range, storage writing error, etc. Subsequently, the relay protection device sends the fixed value modification result feedback message to the substation protection substation module through the station link;

[0107] B25, after the substation protection substation module receives the fixed value modification result feedback message of the relay protection device, it checks the fixed value modification result feedback message and forwards it back to the main station protection module. After the main station protection module receives the fixed value modification result feedback message, it determines whether the fixed value modification operation is successful according to the content in the fixed value modification result feedback message. If successful, it prompts the operator that the modification has been completed and updates the relevant fixed value record information. If failed, it displays the specific failure reason to the operator for subsequent further processing measures;

[0108] The control flow of modifying the fixed value in the running fixed value area is as follows:

[0109] B31, after the operator initiates the operation instruction of modifying the fixed value in the running fixed value area in the main station protection module, the main station protection module first evaluates the running state of the entire power system to determine whether the conditions for switching the running fixed value area are met (such as whether the relevant protection function is in a switchable state, whether there is an important protection action being executed, etc.), and determines the information of the target fixed value area number to be switched to. After confirming that there is no error, the main station protection module constructs a pre-request message for switching the running fixed value area according to the communication protocol, which contains the key contents of the relay protection device information, the current running fixed value area number, and the target fixed value area number, and sends the message to the substation protection substation module through the protection channel;

[0110] B32, after the substation protection substation module receives the pre-request message, it checks the pre-request message and forwards it to the relay protection device after the check is passed. After receiving the pre-request message, the relay protection device comprehensively checks its current running state to determine whether it indeed has the conditions for switching the running fixed value area, such as whether there is an ongoing fault processing, whether the phase locking logic is met, etc. If the conditions are met, the relay protection device performs the corresponding locking operation (such as temporarily locking some protection outlets that may be affected by the fixed value switching, etc.), and then returns a confirmation message allowing switching to the substation protection substation module. If the conditions are not met, a switching disallowed message with detailed reasons is returned;

[0111] B33, the substation protection substation module receives the confirmation message returned by the relay protection device that switching is allowed, and forwards it back to the main station protection module. After receiving the confirmation message that switching is allowed, the main station protection module organizes the new setting value data that has been strictly checked and formatted into a setting value modification message, sends it to the substation protection substation module through the protection channel, and then forwards it to the relay protection device by the substation protection substation module. After receiving the new setting value data, the relay protection device starts to write it into the original operating setting value area. In this process, strict data comparison, checking and updating operations are performed to ensure that the new setting value can accurately replace the old setting value and complete the switching operation of the operating setting value area.

[0112] B34, after the switching of the operating setting value area is completed, the relay protection device performs an unlocking operation to restore the related protection function output settings that were locked for switching the setting value area, and generates a feedback message containing information about the success of setting value modification and the completion of unlocking. The feedback message is sent to the substation protection substation module through the in-station link, and the substation protection substation module forwards it to the main station protection module after verification.

[0113] B35, after receiving the feedback message, the main station protection module confirms that the operating setting value area has been successfully modified and the related protection functions have been restored to normal, updates the operating setting value information and device state information of the relay protection device recorded in itself, and prompts the operator on the operation interface that the operation is successful. At the same time, the data involved in the entire operation process is stored for subsequent query, statistics and analysis.

[0114] The substation remote module is used to correctly and completely forward the relevant remote operation instructions issued by the main station EMS module to the controlled relay protection device.

[0115] As shown in Figure 4 , the substation remote module forwards the remote operation instructions issued by the main station EMS module as follows:

[0116] C1, receive the remote operation instructions issued by the main station EMS module through the remote channel, and use the verification formula to verify the remote operation instructions. The verification formula is as follows:

[0117] R(x)=M(x)*x n-k +r(x), where R(x) is the generating polynomial, M(x) is the information polynomial, n is the degree of the generating polynomial R(x), k is the degree of M(x), and r(x) is the remainder polynomial.

[0118] C2, if the verification fails, send an error message to the main station EMS module to request re-sending the instructions; if the verification passes, go to C3.

[0119] C3, the instructions passed the test are parsed to extract key information, including the operation object, operation type and related parameters, and the instructions are preprocessed according to the key information;

[0120] C4, according to the operation object information obtained by parsing, the preprocessed instructions are accurately forwarded to the corresponding controlled relay protection device;

[0121] C5, after the relay protection device completes the operation, the operation result is fed back to the substation remote module. After receiving the feedback information, the remote module parses and verifies it to ensure the accuracy and integrity of the result;

[0122] C6, the operation result and related process information are recorded in the local log file or database for subsequent query and analysis; at the same time, according to the operation result, the corresponding report is generated and fed back to the main station EMS module through the remote channel to inform whether the operation is successful and the related detailed information;

[0123] The substation protection substation module is used to correctly and completely forward the relevant remote operation instructions issued by the main station protection module to the controlled relay protection device;

[0124] The substation protection substation module forwards the remote operation instructions issued by the main station EMS module as follows:

[0125] D1, the substation protection substation module receives the remote operation instructions from the main station EMS module; the remote operation instructions include soft pressure plate switching, value area switching and signal reset remote operation;

[0126] D2, after receiving the instructions, the substation protection substation module parses the instructions to ensure that their format and content meet the pre-defined protocol and standard;

[0127] D3, after parsing the instructions, the substation protection substation module will perform instruction checking, including checking the integrity, correctness and legality of the instructions;

[0128] D31, if the instruction checking is passed, the substation protection substation module will forward the instructions to the controlled relay protection device, and after the instruction forwarding, the substation protection substation module needs to wait for the confirmation information from the relay protection device to confirm that the instructions have been successfully received and executed;

[0129] D32, if the instruction checking is not passed, the substation protection substation module sends error information to the main station protection module to request to resend the instructions

[0130] D4, the substation protection substation module records the receiving, parsing, checking, forwarding and confirmation process of the instructions, and generates corresponding log information for subsequent audit and troubleshooting.

[0131] The relay protection device is used for protecting stable operation of the power system.

[0132] The working process of the relay protection device for protecting stable operation of the power system is as follows:

[0133] E1, collecting electrical quantities of current and voltage of the power system through current transformers and voltage transformers, and measuring and calculating the collected electrical quantities to obtain real-time state information of the power system;

[0134] E2, performing fault detection according to the collected electrical quantities and preset protection logic, if no fault is detected, entering E1, if a fault (such as short circuit, overload, etc.) is detected, entering E3;

[0135] E3, the relay protection device immediately performs preset protection actions, including tripping, removing faulty equipment, etc., to isolate the fault and prevent the fault from spreading;

[0136] E4, after the fault is handled, the relay protection device records information of the time, location and type of the fault, and generates a corresponding fault report, which is used for subsequent accident analysis and fault troubleshooting.

[0137] E5, after the fault is isolated and handled, the relay protection device enters a recovery state, and waits for confirmation information from the operator or automatically performs a reset operation to restore normal protection functions.

[0138] Through cooperation of the master station EMS module, the master station protection module, the substation remote module, the substation protection substation module and the relay protection device, accuracy and reliability of relay protection remote operation can be ensured, so that safe and stable operation of the power grid can be effectively ensured, at the same time, since remote operation is realized, workload of the operation and maintenance personnel can be greatly reduced, work efficiency is improved, in addition, through the message combined with the file double checking mode, accuracy and safety of the operation can be further improved, and operation and maintenance cost is reduced.

[0139] Based on the above description, a relay protection remote control system based on message combined with file double checking is provided, and a relay protection remote control method based on message combined with file double checking is provided, as shown in Figure 5 The method comprises the following steps:

[0140] S1, the master station EMS module or the master station protection module generates a remote operation instruction, and sends the instruction to the substation through a remote channel or a protection channel;

[0141] S2, the substation remote module or the substation protection substation module receives the instruction, and performs preliminary message analysis and verification, after verification, the instruction is forwarded to the controlled relay protection device;

[0142] S3. The relay protection device receives the command and performs a secondary check at the message level to ensure the correctness of the command;

[0143] S4. For remote setting value modification operations, the master station security module generates a file containing detailed setting value information and sends it to the substation security module through the security channel;

[0144] S5. The substation security substation module receives the file and performs integrity and format checks on the file. After passing the checks, the file is forwarded to the controlled relay protection device.

[0145] S6. The relay protection device receives the file and performs a secondary verification at the file level. The secondary verification at the file level includes the correctness and completeness of the file content and whether it is consistent with the current system status;

[0146] S7. After the message and file are verified, the relay protection device executes the remote operation command, which includes soft pressure plate activation and deactivation, setting zone switching, signal reset or setting value modification;

[0147] S8. During the execution process, the relay protection device needs to perform real-time status monitoring and fault detection to ensure the safety and effectiveness of the operation;

[0148] S9. After the relay protection device completes the operation, it sends the operation result feedback to the substation protection substation module or the substation telecontrol module;

[0149] S10, the substation security substation module or the substation telecontrol module receives the feedback and performs corresponding processing or recording;

[0150] S11. The master station EMS module or the master station security module confirms whether the remote operation is successfully completed based on the feedback result.

[0151] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A relay protection remote control system based on message and file dual verification, characterized by: include: Master station EMS module, which remotely operates the soft pressure plate activation and deactivation, setting zone switching and signal reset of the relay protection device through the telecontrol channel; A master station security module, which implements remote operation of setting value modification of the relay protection device through a security channel, and the master station EMS module is electrically connected to the master station security module; Substation telecontrol module, which is used to correctly and completely forward the relevant remote operation instructions issued by the master station EMS module to the controlled relay protection device; The substation security substation module is used to correctly and completely forward the relevant remote operation instructions issued by the main station security module to the controlled relay protection device; A relay protection device, wherein the relay protection device is used to protect the stable operation of the power system; The master station EMS module is electrically connected to the substation telecontrol module, the master station security module is electrically connected to the substation security substation module, and both the substation telecontrol module and the substation security substation module are electrically connected to the relay protection device; The process of the master station EMS module performing the soft pressure plate activation and deactivation operation on the relay protection device through the telecontrol channel includes a selection process, an execution process, and a cancellation process. The selection process is as follows: the master station EMS module sends a remote control selection command to the substation telecontrol module, the object is the soft pressure plate entry to be remotely controlled, and the target value is the soft pressure plate target value. After receiving the remote control selection command, the substation telecontrol module returns a remote control selection return message to the master station EMS module: The execution process is as follows: the master station EMS module sends a remote control execution command to the substation telecontrol module. After receiving the remote control execution command, the substation telecontrol module returns a remote control execution result response to the master station EMS module. The cancellation process is as follows: the master station EMS module sends a remote control cancellation command to the substation telecontrol module. After receiving the remote control cancellation command, the substation telecontrol module returns a remote control cancellation result response to the master station EMS module. The master station EMS module switches the relay protection device setting zone through the telecontrol channel as follows: A1. The master station EMS module constructs the remote adjustment setting command message according to the DL / T634.5104 protocol; A2. The master station EMS module sends the constructed remote adjustment setting point command message to the corresponding relay protection device through the telecontrol channel; A3. After receiving the message, the relay protection device parses and verifies the message; A4. If the verification passes, the relay protection device performs the setting zone switching operation. The relay protection device switches its own operating setting zone to the setting zone number specified in the message. During the switching process, the relevant parameters will be updated and reconfigured to adapt to the new setting zone setting. A5. After the relay protection device completes the fixed value zone switching, it returns the remote adjustment set point command execution result message to the master station EMS module; the execution result message contains information on whether the switching is successful. If successful, the master station EMS module confirms that the fixed value zone switching operation is completed; if failed, the master station EMS module performs further analysis and processing based on the returned error information.

2. The relay protection remote control system based on message and file dual verification according to claim 1 is characterized in that: When the master station EMS module remotely operates the signal reset of the relay protection device through the telecontrol channel, the reset operation includes a reset selection process and a reset execution process, wherein the reset selection process is that the master station EMS module sends a remote control command with selection to the substation telecontrol module, and the substation telecontrol module returns a remote control selection result response to the master station EMS module after receiving the selected remote control command; The restoration execution process is that the master station EMS module sends a remote control command with execution to the substation telecontrol module. After receiving the executed remote control command, the substation telecontrol module returns the remote control execution result response to the master station EMS module.

3. The relay protection remote control system based on message and file dual verification according to claim 2 is characterized in that: The remote operation of the master station security module to modify the set value of the relay protection device includes the control process of reading the set value of any area, the control process of modifying the set value of the non-operating set value area, and the control process of modifying the set value of the operating set value area.

4. The relay protection remote control system based on message and file dual verification according to claim 3 is characterized in that: The control flow for reading the set value of any area is as follows: B11. The operator sends a command to the master station security module based on the relevant identification information of the relay protection device whose set value is to be read and the designated set value zone number. The master station security module constructs a request message for reading the set value of any zone according to the command information and the established communication protocol format, and then sends the request message to the substation security module through the security channel; B12. After receiving the set value read request message from the master station's set value read request module, the substation security module verifies the message to check whether there are any problems with the message format, including whether it is correct or whether there are any transmission errors. If the verification is correct, the set value read request message is forwarded intact to the corresponding relay protection device; If a problem is found in the message, an error message will be returned to the main station security module to inform it that the forwarding is abnormal; B13. After receiving the request message for reading the set value, the relay protection device first verifies the legitimacy of the request message to confirm that it comes from an authorized master station and meets its own communication requirements. After the verification is passed, the relay protection device extracts the corresponding set value data from its own corresponding storage area according to the set value area number specified in the request message, organizes and encapsulates the set value data according to the communication protocol requirements, and forms a set value response message that can be returned. The set value response message is then sent back to the substation security substation module through the intra-station link; B14. After receiving the fixed value response message sent back by the relay protection device, the substation security module will perform another integrity and accuracy check on the fixed value response message to ensure that there are no errors in the data during the transmission process within the station. If the check is qualified, the fixed value response message will be forwarded back to the main station security module through the security channel; B15. After the master station security module receives the fixed value response message forwarded back by the substation security module, it parses the fixed value response message according to the communication protocol, extracts the fixed value data contained therein, and displays the fixed value data on the operation interface.

5. The relay protection remote control system based on message and file dual verification according to claim 4 is characterized in that: The control flow for modifying the set value in the non-operating set value area is as follows: B21, the master station security module generates a fixed value modification message based on the detailed information of the relay protection device to be modified, the target non-operating fixed value zone number, and the specific new fixed value content, and then sends the fixed value modification message to the substation security module through the security channel; B22. After receiving the fixed value modification message from the master station security module, the substation security module verifies the fixed value modification message. The verification content includes whether the fixed value modification message is compliant and whether the data verification code is correct. If the verification passes, the fixed value modification message is forwarded to the relay protection device. If the verification fails, the fixed value modification message with the specific error reason is returned to the master station security module, and it is informed that the request cannot be executed; B23. After receiving the setting value modification request message, the relay protection device also verifies the legitimacy of the message. After confirming that it is correct, it extracts the new setting value data in the message and writes it into the corresponding non-operation setting value area; B24. After the setting value is updated, the relay protection device will generate a setting value modification result feedback message, which will indicate whether the setting value modification is successful. If successful, the corresponding success flag will be set and some simple operation record information will be attached; If it fails, the reason for the failure will be explained in detail in the fixed value modification result feedback message. Subsequently, the relay protection device will send the fixed value modification result feedback message to the substation security substation module through the station link; B25. After the substation security substation module receives the fixed value modification result feedback message from the relay protection device, it verifies the fixed value modification result feedback message and forwards it back to the main station security module. After the main station security module receives the fixed value modification result feedback message, it determines whether the fixed value modification operation is successful based on the content in the fixed value modification result feedback message. If successful, it prompts the operator that the modification is completed and updates the relevant fixed value record information; if failed, the specific reason for failure is displayed to the operator.

6. The relay protection remote control system based on message and file dual verification according to claim 5, characterized in that: The control flow for modifying the set value in the running set value area is as follows: B31. After the operator initiates an instruction to modify the set value of the operating set value zone in the master station security module, the master station security module first evaluates the current operating status of the entire power system to determine whether the conditions for switching the operating set value zone are met. At the same time, it determines the target set value zone number to be switched to. After confirmation, the master station security module constructs a pre-request message for switching the operating set value zone according to the communication protocol and sends the message to the substation security substation module through the security channel; B32. After receiving the pre-request message, the substation security substation module verifies the pre-request message and forwards it to the relay protection device after passing the verification. After receiving the pre-request message, the relay protection device conducts a comprehensive check of its current operating status to determine whether the conditions for switching to the operating setting zone are met. If the conditions are met, the relay protection device performs the corresponding locking operation and then returns a confirmation message allowing the switching to the substation security substation module; If the conditions are not met, a switch-not-allowed message with detailed reasons is returned; B33. After receiving the confirmation message of switching permission returned by the relay protection device, the substation security module forwards it to the master station security module. After receiving the confirmation message of switching permission, the master station security module organizes the new set value data that has undergone strict verification and formatting into a set value modification message, and sends it to the substation security module through the security channel. The substation security module then forwards it to the relay protection device. After receiving the new set value data, the relay protection device begins to write it into the original operating set value area. B34. After the switching of the operating setting zone is completed, the relay protection device performs the unlocking operation, restores the relevant protection function output settings that were locked before switching the setting zone, and generates a feedback message containing the setting value modification success and unlocking completion information, which is sent to the substation security substation module through the station link. The substation security substation module verifies and forwards it to the main station security module; B35. After receiving the feedback message, the master station security module confirms that the operating setting area has been successfully modified and the relevant protection functions have returned to normal. It updates the operating setting information and device status information of the relay protection device recorded in itself, and prompts the operator on the operation interface that the operation is successful. At the same time, the data involved in the entire operation process is stored and archived.

7. The relay protection remote control system based on message and file dual verification according to claim 6 is characterized in that: The substation telecontrol module forwards the remote operation instructions issued by the master station EMS module as follows: C1. Receive the remote operation command issued by the master station EMS module through the remote control channel and verify the remote operation command using the verification formula. The verification formula is as follows: R(x)=M(x)*x n-k +r(x), where R(x) is the generator polynomial, M(x) is the message polynomial, n is the degree of the generator polynomial R(x), k is the degree of M(x), and r(x) is the remainder polynomial; C2: If the verification fails, an error message is sent to the master EMS module, requesting the command to be resent; if the verification passes, enter C3; C3. Parse the passed instructions and extract key information, including the operation object, operation type, and related parameters. Pre-process the instructions based on the key information. C4. According to the operation object information obtained by parsing, the pre-processed instruction is accurately forwarded to the corresponding controlled relay protection device; C5. After the relay protection device completes the operation, it will feed back the operation results to the substation telecontrol module; C6. Record the operation results and related process information in a local log file or database. At the same time, generate a corresponding report based on the operation results and feed it back to the master station EMS module through the telecontrol channel to inform it whether the operation is successful and related detailed information.

8. A relay protection remote control method based on message and file dual verification, based on the relay protection remote control system based on message and file dual verification according to any one of claims 1 to 7, characterized in that: The steps include: S1. The master station EMS module or the master station security module generates remote operation instructions and sends them to the substation through the telecontrol channel or security channel; S2. The substation telecontrol module or substation security substation module receives the command and performs preliminary message parsing and verification. After passing the verification, the command is forwarded to the controlled relay protection device. S3. The relay protection device receives the command and performs a secondary check at the message level to ensure the correctness of the command; S4. For remote setting value modification operations, the master station security module generates a file containing detailed setting value information and sends it to the substation security module through the security channel; S5. The substation security substation module receives the file and performs integrity and format checks on the file. After passing the checks, the file is forwarded to the controlled relay protection device. S6. The relay protection device receives the file and performs a secondary verification at the file level. The secondary verification at the file level includes the correctness and completeness of the file content and whether it is consistent with the current system status; S7. After the message and file are verified, the relay protection device executes the remote operation command, which includes soft pressure plate activation and deactivation, setting zone switching, signal reset or setting value modification; S8. During the execution process, the relay protection device needs to perform real-time status monitoring and fault detection to ensure the safety and effectiveness of the operation; S9. After the relay protection device completes the operation, it sends the operation result feedback to the substation protection substation module or the substation telecontrol module; S10, the substation security substation module or the substation telecontrol module receives the feedback and performs corresponding processing or recording; S11. The master station EMS module or the master station security module confirms whether the remote operation is successfully completed based on the feedback result.

Images