Power grid fault diagnosis method and system based on dynamic topology and protection action logic

Abstract

The invention discloses a power grid fault intelligent diagnosis method and system based on dynamic topology analysis and general protection action logic, and the method comprises the steps: organizing various event signals having an incidence relation with primary equipment into a single equipment group based on network topology analysis; the low-voltage equipment of the same plant station and the single equipment group of the bus or the main transformer with the topological connection relation form a cross-interval equipment virtual group; judging that the single equipment group successfully matched with the single equipment fault rule has a single equipment fault, and forming a fault diagnosis rapid result and a fault diagnosis comprehensive result of the single equipment; performing override trip fault rule matching on the cross-interval equipment virtual group, and organizing the fault diagnosis comprehensive result of each successfully matched single equipment into a fault diagnosis comprehensive result of an override trip fault according to an override trip fault rule; and judging that each unsuccessfully matched single equipment fault is a continuous single equipment fault, and keeping a fault diagnosis comprehensive result of the single equipment. Intelligent diagnosis of power grid faults is realized.

Description

Technical Field

[0001] The present invention belongs to the field of intelligent diagnosis of power grid faults at a dispatching master station or a trust-guaranteeing master station, and in particular relates to an intelligent diagnosis method and system for power grid faults based on dynamic topology analysis and universal protection action logic. Background Art

[0002] When a power grid fails, a large number of alarm events such as protection actions, protection telesignals, switch position changes, and abnormal alarms will be generated, accompanied by protection recording files and recorder recording files. When a large amount of information is uploaded to the main station, it is difficult for operation and maintenance personnel to quickly manually analyze the specific faulty equipment and related fault information from the complex and discrete information; and because the switch action information, protection action information, and recording files are generally uploaded to the dispatching main station, the security signal main station, and the recording main station respectively, different professional operation and maintenance personnel use different main station systems, and there are professional barriers. It is difficult for general operation and maintenance personnel to comprehensively use the information of various systems for comprehensive fault diagnosis; and when an over-tripping fault occurs, the number of intervals involved increases and the signals are more numerous, making it increasingly difficult to quickly analyze the source of the fault manually.

[0003] At present, the fault diagnosis technology of the dispatching master station mainly uses the switch position SOE signal and the protection action telesignaling signal. According to the degree of practicality of the security master station and the recording master station and the degree of multi-source system information fusion, the security information and recording information are used as auxiliary. The fault diagnosis conclusion is generally sent to the alarm window, and the generated fault report is relatively brief. The use scenario of this technology is mainly to facilitate operation and maintenance personnel to quickly find faults and deal with them. The fault diagnosis of the security master station mainly uses the protection action signal and recording information of the protection device to perform fault diagnosis and report generation for a single device. However, because the reliability of the security master station signal is lower than the hard contact signals such as the switch action and protection action of the dispatching master station, the accuracy of fault diagnosis needs to be improved. The above-mentioned commonly used fault diagnosis technologies lack the comprehensive and effective use of multi-source system information, and lack the ability to diagnose cross-interval over-tripping.

[0004] How to integrate and fully utilize various types of information from different systems to automatically, quickly and accurately perform intelligent diagnosis of power grid faults and form detailed fault reports to guide operation and maintenance personnel to quickly handle faults is an urgent problem that the master station needs to solve. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a method and system for intelligent diagnosis of power grid faults based on dynamic topology analysis and universal protection action logic. By integrating the original data of multiple master station systems and based on the dynamic topology analysis of the power grid network model, massive alarm information is grouped according to the primary main equipment for processing. Combined with the universal protection action logic, intelligent diagnosis of single equipment faults is achieved. Combined with the dynamic topological connection relationship of the primary equipment and the action logic of skipping tripping, intelligent diagnosis of skipping tripping faults is achieved.

[0006] The present invention adopts the following technical solution.

[0007] The present invention proposes a power grid fault intelligent diagnosis method based on dynamic topology analysis and universal protection action logic, comprising:

[0008] Step 1, receiving various event signals sent by the master station in real time, including protection action signals, protection trip position relay signals, switch action event sequence recording signals, and wave recording event signals;

[0009] Step 2, in the operation mode under the power grid fault, according to the real-time status information of the power grid and the relationship between the primary and secondary devices in the power grid, based on the network topology analysis method, various event signals associated with the primary equipment are organized into a single device group belonging to the primary equipment, and the low-voltage equipment of the same plant and the single device group of the busbar or main transformer with a topological connection relationship are grouped into a virtual group of cross-bay equipment;

[0010] Step 3: Use the protection action logic of the primary device to form a single device fault rule, and match the logical relationship between the signals in each single device group with the single device fault rule; for the single device group that successfully matches, it is determined that a single device fault occurs, and the process goes to step 4; if all single device groups fail to match, it is determined that no fault occurs, and the current round of diagnosis ends, and the process returns to step 1;

[0011] Step 4: after determining that a single device fault occurs, a quick fault diagnosis result is formed before the fault waveform is collected, and after the fault waveform is collected, a comprehensive fault diagnosis result of the single device is formed by combining the quick fault diagnosis result and the fault waveform analysis result;

[0012] Step 5, according to the protection action logic of the primary equipment, the correlation relationship between various event signals is obtained, and the cross-interval protection action logic during over-tripping is constructed by using the correlation relationship to form an over-tripping fault rule;

[0013] Step 6, based on the comprehensive fault diagnosis results of the single device and the skip-trip fault rules, the skip-trip fault rules are matched for the virtual group of cross-interval devices. For each single device fault that is successfully matched, the comprehensive fault diagnosis results of each single device are organized into the comprehensive fault diagnosis results of the skip-trip fault according to the skip-trip fault rules; for each single device fault that is not successfully matched, it is determined to be a continuous single device fault, and the comprehensive fault diagnosis results of the single device are maintained.

[0014] Preferably, the master station includes a dispatching master station, a security master station and a recording master station. The switch action event sequence recording signal is sent to the dispatching master station, the protection action signal and the protection trip position relay signal are sent to the security master station, and the recording event signal is sent to the recording master station or the security master station.

[0015] Preferably, the primary and secondary equipment of the dispatching master station and the security master station are uniformly modeled to establish a mapping relationship, and the mapping relationship is established with the data of the recording master station system through device name matching.

[0016] Preferably, the signals corresponding to the circuit breakers at both ends of the same transmission line are organized into a group belonging to the transmission line, and the signals corresponding to the circuit breakers in the interval where the primary equipment is located are organized into a group belonging to the primary equipment.

[0017] Preferably, step 2 also includes: determining the topological relationship between the protection action signal and the switch action event sequence record signal, the topological connection relationship of the primary equipment, and the operating status of the primary equipment based on a network topology analysis method.

[0018] Preferably, when it is determined that there is a topological connection relationship between the protection action signal and the switch action event sequence record signal, the action signal and the switch action event sequence record signal are organized into a group.

[0019] Preferably, when it is determined that the primary devices have a topological connection relationship, the related primary devices are formed into a virtual group of devices across intervals.

[0020] Preferably, when it is determined that the primary equipment is in an operating state, the primary equipment participates in the power grid fault diagnosis; when it is determined that the primary equipment is not in an operating state, the primary equipment does not participate in the power grid fault diagnosis; wherein, if the primary equipment is hung with a maintenance sign or the isolating switches on both sides of the circuit breaker connected to the primary equipment are in an open state, it is considered that the primary equipment is not in an operating state.

[0021] Preferably, step 2 also includes: when forming a group, when the circuit breaker associated with the primary device does not have a switch action event sequence recording signal, a protection trip position relay signal is used to replace the switch action event sequence recording signal, and the topological relationship between the protection action signal and the protection trip position relay signal is determined based on a network topology analysis method.

[0022] Preferably, the fault waveform includes: a protection waveform under fault generated by a protection device, and a recorder waveform under fault generated by a recorder;

[0023] The fault waveform is determined to be related to the fault when the following rules are met:

[0024] 1) The protection waveform of the primary device is the same as that of the faulty device, and the generation time of the protection waveform is close to the fault time;

[0025] 2) The plant station is connected to one end of the faulty line. The waveforms of the recorders of the plant station and the faulty line are the same, and the waveform generation time of the recorder is close to the fault time.

[0026] Preferably, the association relationship between various event signals includes: the coordination relationship between the protection action signal and the switch action event sequence recording signal, the coordination relationship between the protection action signals, and the protection and switch action timing; wherein the coordination relationship refers to the time sequence and whether it refuses to move.

[0027] Preferably, the comprehensive fault diagnosis result of the over-tripping fault refers to combining the comprehensive fault diagnosis results of a single device, improving the fault equipment, fault time, fault phase, fault distance and switch action evaluation according to the over-tripping fault rule, and organizing the protection action information, waveform information and interval topology diagram.

[0028] The present invention also proposes a power grid fault intelligent diagnosis system based on dynamic topology analysis and universal protection action logic, comprising:

[0029] Acquisition module, group module, single equipment fault diagnosis module, over-trip fault diagnosis module;

[0030] The acquisition module is used to receive various event signals sent by the master station in real time, including protection action signals, protection trip position relay signals, switch action event sequence recording signals, and wave recording event signals;

[0031] The group module is used for the operation mode under the power grid fault. According to the real-time status information of the power grid and the relationship between the primary and secondary devices in the power grid, based on the network topology analysis method, various event signals associated with the primary equipment are organized into a single device group belonging to the primary equipment, and the low-voltage equipment of the same plant and the single device group of the busbar or main transformer with a topological connection relationship are grouped into a virtual group of cross-bay equipment;

[0032] The single device fault diagnosis module is used to form a single device fault rule by using the protection action logic of the primary device, and match the logical relationship between the signals in each single device group with the single device fault rule; for a single device group that successfully matches, it is determined that a single device fault occurs; for a single device group that fails to match, it is determined that no fault occurs; after determining that a single device fault occurs, a fault diagnosis quick result is formed before the fault waveform is collected, and after the fault waveform is collected, a single device fault diagnosis comprehensive result is formed by the fault diagnosis quick result and the fault waveform analysis result;

[0033] The over-tripping fault diagnosis module is used to obtain the correlation between various event signals according to the protection action logic of the primary equipment, and use the correlation to construct the cross-interval protection action logic during over-tripping to form over-tripping fault rules; based on the comprehensive fault diagnosis results of a single device and the over-tripping fault rules, the over-tripping fault rules are matched for the virtual group of cross-interval devices, and for each single device fault that is successfully matched, the comprehensive fault diagnosis results of each single device are organized into the comprehensive fault diagnosis results of the over-tripping fault according to the over-tripping fault rules; for each single device fault that is not successfully matched, it is determined to be a continuous single device fault, and the comprehensive fault diagnosis results of the single device are maintained.

[0034] The beneficial effect of the present invention is that, compared with the prior art, a method for intelligent diagnosis of power grid faults based on dynamic topology analysis and general protection action logic is provided, which integrates the original data of multiple master station systems through unified modeling and model mapping of primary and secondary equipment, comprehensively utilizes the original information of multiple source systems such as the dispatching master station, the security master station, and the recording master station, performs multi-stage fault diagnosis, realizes the comprehensive utilization of data of multiple master station systems and can identify over-tripping faults. First, the switch action SOE signal, the security protection action signal, and the protection TWJ signal light are comprehensively utilized, and based on the dynamic topology analysis of the power grid network model, the massive alarm information is grouped according to the primary main equipment, and combined with the single equipment fault rule base formed according to the general protection action logic, a single equipment fault is quickly diagnosed, and then, the recording information is integrated to perform comprehensive fault diagnosis, and a relatively complete single equipment fault report is formed. Finally, the dynamic topological connection relationship of the primary equipment and the over-tripping rule base formed according to the action logic of the over-tripping are combined to realize the intelligent diagnosis of the over-tripping fault and form a comprehensive fault report. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flow chart of a method for intelligent diagnosis of power grid faults based on dynamic topology analysis and universal protection action logic in the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0037] The present invention provides a method for intelligent diagnosis of power grid faults based on dynamic topology analysis and universal protection action logic. Figure 1 ,include:

[0038] Step 1: Receive various event signals sent by the master station in real time, including but not limited to protection action signals, protection trip position relay (TWJ) signals, switch action SOE (sequence of event) signals and waveform event signals.

[0039] Specifically, the master station includes but is not limited to: a dispatching master station, a security master station and a recording master station. The switch action SOE signal is sent to the dispatching master station, the protection action signal and the protection TWJ signal are sent to the security master station, and the recording event signal is sent to the recording master station or the security master station.

[0040] The present invention integrates the original data of multiple master station systems through unified modeling and model mapping of primary and secondary equipment, and comprehensively utilizes the original information of multi-source systems such as the dispatching master station, the security master station, and the recording master station to perform multi-stage fault diagnosis. Data fusion is a complex process, the core of which is to map the models between different systems (different technologies have different ways of establishing mapping relationships), process the original data of other systems into data that can be recognized by the target system, and then perform subsequent group processing. In a non-limiting preferred embodiment, the data fusion method of the present invention is: the primary and secondary equipment of the dispatching master station and the security master station are uniformly modeled, a mapping relationship is established, and a mapping relationship is established with the data of the recording master station system through device name matching.

[0041] Step 2, in the operation mode under power grid fault, according to the real-time status information of the power grid and the relationship between the primary and secondary devices in the power grid, based on the network topology analysis method, various event signals that are associated with the primary equipment are organized into a single equipment group belonging to the primary equipment, and the low-voltage equipment of the same plant and the single equipment group of the bus or main transformer with a topological connection relationship are grouped into a virtual group of cross-interval equipment.

[0042] Specifically, the primary equipment includes but is not limited to: lines, main transformers, busbars, capacitors, reactors, feeders, station transformers, ground transformers, and zigzag transformers. In a non-limiting preferred embodiment, the group is to organize signals with associated relationships into a group, so the signals corresponding to the circuit breakers at both ends of the same transmission line are organized into a group belonging to the transmission line, and the signals corresponding to the circuit breakers in the interval where the primary equipment is located are organized into a group belonging to the primary equipment.

[0043] Step 2 also includes: determining the topological relationship between the protection action signal and the switch action SOE signal, the topological connection relationship of the primary device, and the operating status of the primary device based on the network topology analysis method;

[0044] When it is determined that there is a topological connection relationship between the protection action signal and the switch action SOE signal, the action signal and the switch action SOE signal are organized into a group; in a non-restrictive preferred embodiment, the primary device associated with the protection action signal of the main transformer fault is the main transformer, and the main transformer has a topological connection relationship with the three-side switches, so the related signals can be processed into a group through topology.

[0045] When it is determined that the primary equipment has a topological connection relationship, the related primary equipment is formed into a virtual group of cross-interval equipment; in a non-restrictive preferred embodiment, such as the feeder failure to trip the low-voltage side of the transformer, the connection relationship between the feeder and the low-voltage side of the transformer is obtained through the low-voltage bus topology.

[0046] When it is determined that the primary equipment is in operation, the primary equipment participates in the power grid fault diagnosis; when it is determined that the primary equipment is not in operation, the primary equipment does not participate in the power grid fault diagnosis; wherein, if the primary equipment is hung with a maintenance sign or the isolating switches on both sides of the circuit breaker connected to the primary equipment are in the open state, the primary equipment is considered to be not in operation.

[0047] Step 2 also includes: when forming a group, if the circuit breaker associated with the primary device has no switch action SOE signal, using the protection TWJ signal to replace the switch action SOE signal, and then judging the topological relationship between the protection action signal and the protection TWJ signal based on the network topology analysis method.

[0048] Among them, the real-time status information of the power grid includes the opening and closing positions of the circuit breaker, the opening and closing positions of the disconnectors on both sides of the circuit breaker, and analog quantities such as voltage, current, and active power.

[0049] The groups proposed in the present invention include single device groups and cross-interval device virtual groups. The single device group organizes the original signals of the main station under the corresponding single device group for subsequent single device fault diagnosis; the cross-interval device virtual group groups the low-voltage equipment of the same plant station and the single device group of the bus or main transformer with a topological connection relationship to form a virtual group for subsequent over-tripping fault diagnosis.

[0050] Step 3, use the protection action logic of the primary device to form a single device fault rule, and match the logical relationship between the signals in each single device group with the single device fault rule; for the single device group that matches successfully, it is determined that a single device fault has occurred, and the process goes to step 4; when all single device groups fail to match, it is determined that no fault has occurred, the current round of diagnosis ends, and the process returns to step 1.

[0051] Single equipment fault rules include but are not limited to lines, main transformers, busbars, capacitors, reactors, feeders, station transformers, and grounding transformers. Fault types include but are not limited to instantaneous faults and permanent faults. Specifically, the general protection action logic of primary equipment refers to the general action logic of primary equipment protection devices. Taking the line as an example, it includes common fault action logics such as line instantaneous faults, line permanent faults, and single-ended line faults. Various types of single equipment fault rules constitute a single equipment fault rule knowledge base.

[0052] If all single device groups fail to match, the current round of diagnosis ends and a new round of cycle begins;

[0053] In the present invention, conventional single main equipment fault diagnosis is used as the basis for over-tripping diagnosis.

[0054] Step 4, after determining that a single device fault has occurred, a quick fault diagnosis result is formed before the fault waveform is collected. After the fault waveform is collected, a comprehensive fault diagnosis result of the single device is formed based on the quick fault diagnosis result and the fault waveform analysis result.

[0055] Specifically, the waveform upload or call delay is long, so the fault diagnosis quick result is formed before the fault waveform is collected. The fault diagnosis quick result includes: fault equipment, fault time, coincidence, protection action evaluation, switch action evaluation, interval topology diagram, alarm information collection, etc. After the fault waveform is collected, the waveform analysis result is supplemented, and the fault diagnosis quick result and the waveform analysis result form a comprehensive fault diagnosis result.

[0056] The diagnostic result of the present invention for a single equipment fault can meet both the speed requirement of the fault diagnosis and the reproducibility and comprehensiveness requirement of the fault diagnosis, and the comprehensive result of the fault diagnosis can be used as basic data for accident analysis.

[0057] Specifically, the fault waveform includes: the protection waveform under the fault generated by the protection device, and the recorder waveform under the fault generated by the recorder. Waveform analysis is to determine whether the fault waveform is related to the fault. The fault waveform is determined to be related to the fault when the following rules are met:

[0058] 3) The protection waveform of the primary device is the same as that of the faulty device, and the generation time of the protection waveform is close to the fault time;

[0059] 4) The plant station is connected to one end of the faulty line. The waveforms of the recorders of the plant station and the faulty line are the same, and the waveform generation time of the recorder is close to the fault time.

[0060] The fault waveform analysis results include: fault phase, fault distance, fault voltage, fault current, fault duration and other information.

[0061] The present invention introduces the fault waveform analysis result as one of the criteria for fault diagnosis, so that the fault diagnosis result obtained by the method of the present invention is not simply a failure of a certain device, but a comprehensive diagnosis result including various waveform information and waveform analysis results, which is beneficial to improving the reliability of fault diagnosis.

[0062] Step 5: Obtain the correlation between various event signals according to the protection action logic of the primary equipment, and use the correlation to construct the cross-interval protection action logic during over-tripping to form over-tripping fault rules.

[0063] Specifically, the correlation between various event signals includes but is not limited to: the coordination relationship between the protection action signal and the switch action SOE signal, the coordination relationship between the protection action signals, and the protection and switch action timing; wherein the coordination relationship refers to the time sequence and whether it refuses to move.

[0064] Step 6, based on the comprehensive fault diagnosis results of the single device and the skip-trip fault rules, the skip-trip fault rules are matched for the virtual group of cross-interval devices. For each single device fault that is successfully matched, the comprehensive fault diagnosis results of each single device are organized into a comprehensive diagnosis result of the skip-trip fault according to the skip-trip fault rules; for each single device fault that is not successfully matched, it is determined to be a continuous single device fault, and the comprehensive fault diagnosis results of the single device are maintained.

[0065] Specifically, the comprehensive diagnostic result of the over-tripping fault refers to combining the comprehensive fault diagnosis results of a single device, improving the fault summary information such as the faulty device, fault time, fault phase, fault distance, and switch action evaluation according to the over-tripping fault rules, and reorganizing the protection action information, waveform information, interval topology diagram, etc.

[0066] Specifically, a plurality of over-tripping fault rules constitute an over-tripping fault rule knowledge base. In a non-limiting preferred embodiment, the main transformer over-tripping rules are shown in Table 1.

[0067] Table 1 Main transformer over-tripping rules

[0068]

[0069]

[0070] The present invention also proposes a power grid fault intelligent diagnosis system based on dynamic topology analysis and universal protection action logic, comprising:

[0071] Acquisition module, group module, single equipment fault diagnosis module, over-trip fault diagnosis module;

[0072] The acquisition module is used to receive various event signals sent by the master station in real time, including protection action signals, protection trip position relay signals, switch action event sequence recording signals, and wave recording event signals;

[0073] The group module is used for the operation mode under the power grid fault. According to the real-time status information of the power grid and the relationship between the primary and secondary devices in the power grid, based on the network topology analysis method, various event signals associated with the primary equipment are organized into a single device group belonging to the primary equipment, and the low-voltage equipment of the same plant and the single device group of the busbar or main transformer with a topological connection relationship are grouped into a virtual group of cross-bay equipment;

[0074] The single device fault diagnosis module is used to form a single device fault rule by using the protection action logic of the primary device, and match the logical relationship between the signals in each single device group with the single device fault rule; for a single device group that successfully matches, it is determined that a single device fault occurs; for a single device group that fails to match, it is determined that no fault occurs; after determining that a single device fault occurs, a fault diagnosis quick result is formed before the fault waveform is collected, and after the fault waveform is collected, a single device fault diagnosis comprehensive result is formed by the fault diagnosis quick result and the fault waveform analysis result;

[0075] The over-tripping fault diagnosis module is used to obtain the correlation between various event signals according to the protection action logic of the primary equipment, and use the correlation to construct the cross-interval protection action logic during over-tripping to form over-tripping fault rules; based on the comprehensive fault diagnosis results of a single device and the over-tripping fault rules, the over-tripping fault rules are matched for the virtual group of cross-interval devices, and for each single device fault that is successfully matched, the comprehensive fault diagnosis results of each single device are organized into the comprehensive fault diagnosis results of the over-tripping fault according to the over-tripping fault rules; for each single device fault that is not successfully matched, it is determined to be a continuous single device fault, and the comprehensive fault diagnosis results of the single device are maintained.

[0076] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0077] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0078] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0079] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for intelligent diagnosis of power grid faults based on dynamic topology analysis and universal protection action logic, characterized in that: include: Step 1, receiving various event signals sent by the master station in real time, including protection action signals, protection trip position relay signals, switch action event sequence recording signals, and wave recording event signals; Step 2, in the operation mode under the power grid fault, according to the real-time status information of the power grid and the relationship between the primary and secondary devices in the power grid, based on the network topology analysis method, various event signals associated with the primary equipment are organized into a single device group belonging to the primary equipment, and the low-voltage equipment of the same plant and the single device group of the busbar or main transformer with a topological connection relationship are grouped into a virtual group of cross-bay equipment; Step 3: Use the protection action logic of the primary device to form a single device fault rule, and match the logical relationship between the signals in each single device group with the single device fault rule; for the single device group that is successfully matched, it is determined that a single device fault occurs, and the process goes to step 4; When all single device groups fail to match, it is determined that no fault has occurred, the current round of diagnosis ends, and the process returns to step 1; Step 4: after determining that a single device fault occurs, a quick fault diagnosis result is formed before the fault waveform is collected, and after the fault waveform is collected, a comprehensive fault diagnosis result of the single device is formed by combining the quick fault diagnosis result and the fault waveform analysis result; Step 5, according to the protection action logic of the primary equipment, the correlation relationship between various event signals is obtained, and the cross-interval protection action logic during over-tripping is constructed by using the correlation relationship to form an over-tripping fault rule; Step 6, based on the comprehensive fault diagnosis results of the single device and the skip-trip fault rule, the skip-trip fault rule is matched for the virtual group of devices across the bays, and for each successfully matched single device fault, the comprehensive fault diagnosis results of each single device are organized into the comprehensive fault diagnosis results of the skip-trip fault according to the skip-trip fault rule; Each single device failure that has not been successfully matched is determined to be a continuous single device failure, and the comprehensive fault diagnosis results of the single device are maintained.

2. The intelligent diagnosis method for power grid faults based on dynamic topology analysis and universal protection action logic according to claim 1 is characterized in that: The master station includes the dispatching master station, the security master station and the recording master station. The switch action event sequence recording signal is sent to the dispatching master station, the protection action signal and the protection trip position relay signal are sent to the security master station, and the recording event signal is sent to the recording master station or the security master station.

3. The intelligent diagnosis method for power grid faults based on dynamic topology analysis and universal protection action logic according to claim 2 is characterized in that: The primary and secondary equipment of the dispatching master station and the security master station are uniformly modeled and a mapping relationship is established. The mapping relationship is established with the data of the recording master station system through device name matching.

4. The intelligent diagnosis method for power grid faults based on dynamic topology analysis and universal protection action logic according to claim 1 is characterized in that: The signals corresponding to the circuit breakers at both ends of the same transmission line are organized into a group belonging to the transmission line, and the signals corresponding to the circuit breakers in the interval where the primary equipment is located are organized into a group belonging to the primary equipment.

5. The intelligent diagnosis method for power grid faults based on dynamic topology analysis and universal protection action logic according to claim 1 is characterized in that: Step 2 also includes: determining the topological relationship between the protection action signal and the switch action event sequence record signal, the topological connection relationship of the primary equipment, and the operating status of the primary equipment based on the network topology analysis method.

6. The intelligent diagnosis method for power grid faults based on dynamic topology analysis and universal protection action logic according to claim 5 is characterized in that: When it is determined that there is a topological connection relationship between the protection action signal and the switch action event sequence record signal, the action signal and the switch action event sequence record signal are organized into a group.

7. The intelligent diagnosis method for power grid faults based on dynamic topology analysis and universal protection action logic according to claim 5 is characterized in that: When it is determined that the primary devices have a topological connection relationship, the related primary devices are formed into a virtual group of cross-interval devices.

8. The method for intelligent diagnosis of power grid faults based on dynamic topology analysis and universal protection action logic according to claim 5, characterized in that: When it is determined that the primary equipment is in operation, the primary equipment participates in the power grid fault diagnosis; when it is determined that the primary equipment is not in operation, the primary equipment does not participate in the power grid fault diagnosis; wherein, if the primary equipment is hung with a maintenance sign or the isolating switches on both sides of the circuit breaker connected to the primary equipment are in the open state, the primary equipment is considered to be not in operation.

9. The intelligent diagnosis method for power grid faults based on dynamic topology analysis and universal protection action logic according to claim 2 is characterized in that: Step 2 also includes: when forming a group, if the circuit breaker associated with the primary device does not have a switch action event sequence recording signal, the protection trip position relay signal is used to replace the switch action event sequence recording signal, and the topological relationship between the protection action signal and the protection trip position relay signal is determined based on the network topology analysis method.

10. The method for intelligent diagnosis of power grid faults based on dynamic topology analysis and universal protection action logic according to claim 1, characterized in that: The fault waveform includes: a protection waveform under fault generated by a protection device, and a recorder waveform under fault generated by a recorder; The fault waveform is determined to be related to the fault when the following rules are met: 1) The protection waveform of the primary device is the same as that of the faulty device, and the generation time of the protection waveform is close to the fault time; 2) The plant station is connected to one end of the faulty line. The waveforms of the recorders of the plant station and the faulty line are the same, and the waveform generation time of the recorder is close to the fault time.

11. The method for intelligent diagnosis of power grid faults based on dynamic topology analysis and universal protection action logic according to claim 1, characterized in that: The correlation between various event signals includes: the coordination relationship between the protection action signal and the switch action event sequence recording signal, the coordination relationship between the protection action signals, and the protection and switch action timing; among them, the coordination relationship refers to the time sequence and whether it refuses to move.

12. The method for intelligent diagnosis of power grid faults based on dynamic topology analysis and universal protection action logic according to claim 1, characterized in that: The comprehensive fault diagnosis result of the over-tripping fault refers to combining the comprehensive fault diagnosis results of a single device, improving the faulty device, fault time, fault phase, fault distance and switch action evaluation according to the over-tripping fault rules, and organizing the protection action information, waveform information and interval topology diagram.

13. A power grid fault intelligent diagnosis system based on dynamic topology analysis and universal protection action logic, used to implement the method according to any one of claims 1 to 12, characterized in that: The system comprises: Acquisition module, group module, single equipment fault diagnosis module, over-trip fault diagnosis module; The acquisition module is used to receive various event signals sent by the master station in real time, including protection action signals, protection trip position relay signals, switch action event sequence recording signals, and wave recording event signals; The group module is used for the operation mode under the power grid fault. According to the real-time status information of the power grid and the relationship between the primary and secondary devices in the power grid, based on the network topology analysis method, various event signals associated with the primary equipment are organized into a single device group belonging to the primary equipment, and the low-voltage equipment of the same plant and the single device group of the busbar or main transformer with a topological connection relationship are grouped into a virtual group of cross-bay equipment; The single device fault diagnosis module is used to form a single device fault rule by using the protection action logic of the primary device, and match the logical relationship between the signals in each single device group with the single device fault rule; for a single device group that successfully matches, it is determined that a single device fault occurs; for a single device group that fails to match, it is determined that no fault occurs; after determining that a single device fault occurs, a fault diagnosis quick result is formed before the fault waveform is collected, and after the fault waveform is collected, a single device fault diagnosis comprehensive result is formed by the fault diagnosis quick result and the fault waveform analysis result; The over-tripping fault diagnosis module is used to obtain the correlation between various event signals according to the protection action logic of the primary equipment, and use the correlation to construct the cross-interval protection action logic during over-tripping to form over-tripping fault rules; based on the comprehensive fault diagnosis results of a single device and the over-tripping fault rules, the over-tripping fault rules are matched for the virtual group of cross-interval devices, and for each single device fault that is successfully matched, the comprehensive fault diagnosis results of each single device are organized into the comprehensive fault diagnosis results of the over-tripping fault according to the over-tripping fault rules; for each single device fault that is not successfully matched, it is determined to be a continuous single device fault, and the comprehensive fault diagnosis results of the single device are maintained.

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