State monitoring method and device for power system, computer equipment and medium

Abstract

The invention relates to a state monitoring method and device for an electric power system, computer equipment, a computer readable storage medium and a computer program product, and can be used in the technical field of electric power. The method comprises the following steps: acquiring real-time monitoring data of a power system; determining voltage loss state information of the bus according to the voltage data of the bus and a preset voltage threshold; according to the voltage loss state information, determining the total-station voltage loss state information of the transformer substation, and according to the winding data of the main transformer and the judgment information corresponding to the voltage level, determining the outage state information of the main transformer; determining live state information of the power transmission line according to the electrical parameter data of the power transmission line, the topological connection data of the power transmission line, the no-voltage state information and the shutdown state information; and generating a state monitoring result of the power system according to the no-voltage state information, the no-voltage state information of the whole station, the outage state information and the electrified state information of the power transmission line. By adopting the method, the state monitoring efficiency of the power system can be improved.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for monitoring the condition of an electric power system. Background Art

[0002] As power systems continue to expand and become more complex, their safe and stable operation becomes increasingly important. To ensure their safe operation, power system monitoring technology has been widely applied and developed. Efficient state monitoring of power systems has become a key research topic.

[0003] Traditional technology usually monitors the status of power systems through manual inspections; however, this method requires a lot of manual processing time, resulting in low efficiency of power system status monitoring. Summary of the Invention

[0004] Based on this, it is necessary to provide a method, device, computer equipment, computer-readable storage medium and computer program product for power system status monitoring that can improve the efficiency of power system status monitoring in order to address the above technical problems.

[0005] In a first aspect, the present application provides a method for monitoring the state of a power system. The method comprises:

[0006] Acquire real-time monitoring data of the power system; the real-time monitoring data includes voltage data of the busbar in the substation, winding data of the main transformer, and electrical parameter data of the transmission line;

[0007] Determining the voltage loss state information of the busbar according to the voltage data of the busbar and a preset voltage threshold;

[0008] Determine the overall substation voltage loss status information of the substation based on the voltage loss status information of the busbar, and determine the outage status information of the main transformer based on the winding data of the main transformer and the judgment information corresponding to the voltage level of the main transformer;

[0009] Determining the energized state information of the transmission line based on electrical parameter data of the transmission line, topological connection data of the transmission line, voltage loss state information of the busbar, and outage state information of the main transformer; the topological connection data represents the connection relationship between the transmission line and the equipment in the substation;

[0010] The state monitoring result of the power system is generated according to the voltage loss state information of the busbar, the voltage loss state information of the entire substation, the outage state information of the main transformer and the energized state information of the transmission line.

[0011] In one embodiment, determining the outage status information of the main transformer according to the winding data of the main transformer and the judgment information corresponding to the voltage level of the main transformer includes:

[0012] determining target judgment information from the judgment information according to the voltage level of the main transformer;

[0013] The outage status information of the main transformer is determined according to the target judgment information and the winding data of the main transformer.

[0014] In one embodiment, determining target judgment information from the judgment information according to the voltage level of the main transformer includes:

[0015] When the voltage level of the main transformer is a first preset voltage level or a level higher than the first preset voltage level, determining first judgment information from the judgment information as the target judgment information;

[0016] The determining, based on the target judgment information and the winding data of the main transformer, the outage status information of the main transformer includes:

[0017] When the target judgment information is the first judgment information, determining whether the three-phase voltage value of each winding of the main transformer is less than a preset percentage of the rated voltage value of the main transformer;

[0018] When the three-phase voltage value of each winding of the main transformer is less than a preset percentage of the rated voltage value of the main transformer, the outage status information of the main transformer is determined to be that the main transformer is in an outage state.

[0019] In one embodiment, determining target judgment information from the judgment information according to the voltage level of the main transformer includes:

[0020] When the voltage level of the main transformer is a second preset voltage level or a level lower than the second preset voltage level, determining second judgment information from the judgment information as the target judgment information;

[0021] The determining, based on the target judgment information and the winding data of the main transformer, the outage status information of the main transformer includes:

[0022] In a case where the target judgment information is the second judgment information, judging whether the active power, reactive power and three-phase current data of the winding of the main transformer are zero;

[0023] When the active power, reactive power and three-phase current data of the winding of the main transformer are all zero, determining that the outage state information of the main transformer is that the main transformer is in an outage state;

[0024] When the active power, reactive power and three-phase current data of the winding of the main transformer are not all zero, the outage status information of the main transformer is determined according to the voltage data of the busbar in the main transformer and the switch status information of the main transformer.

[0025] In one embodiment, determining the voltage loss state information of the bus according to the voltage data of the bus and a preset voltage threshold includes:

[0026] Obtaining the three-phase voltage value of the bus from the voltage data of the bus;

[0027] When the three-phase voltage values of the bus are all less than the preset voltage threshold, determining the busbar undervoltage state information as the busbar being in an undervoltage state;

[0028] When any phase voltage value of the bus is greater than or equal to the preset voltage threshold, the bus de-voltage state information is determined to be that the bus is in a partially energized state.

[0029] In one embodiment, determining the whole substation pressure loss status information of the substation according to the pressure loss status information of the busbar includes:

[0030] Determining whether all buses in the substation are in a depressurized state according to the depressurized state information of the busbar;

[0031] When all buses in the substation are in a depressurized state, determining the substation-wide depressurized state information as the substation being in a depressurized state;

[0032] In a case where any busbar in the substation is in a partially energized state, the whole-station-depressurization state information of the substation is determined to indicate that the substation is not in a whole-station-depressurization state.

[0033] In a second aspect, the present application further provides a state monitoring device for a power system. The device comprises:

[0034] A data acquisition module is used to acquire real-time monitoring data of the power system; the real-time monitoring data includes voltage data of the busbar in the substation, winding data of the main transformer and electrical parameter data of the transmission line;

[0035] A first determining module is configured to determine voltage loss status information of the bus according to voltage data of the bus and a preset voltage threshold;

[0036] a second determining module, configured to determine the overall substation undervoltage status information of the substation according to the undervoltage status information of the busbar, and determine the outage status information of the main transformer according to the winding data of the main transformer and the judgment information corresponding to the voltage level of the main transformer;

[0037] a third determining module, configured to determine energized state information of the transmission line based on electrical parameter data of the transmission line, topological connection data of the transmission line, voltage loss state information of the busbar, and outage state information of the main transformer; the topological connection data indicating a connection relationship between the transmission line and equipment within the substation;

[0038] The result generation module is used to generate the status monitoring result of the power system according to the voltage loss status information of the busbar, the voltage loss status information of the entire substation, the outage status information of the main transformer and the energized status information of the transmission line.

[0039] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are performed:

[0040] Acquire real-time monitoring data of the power system; the real-time monitoring data includes voltage data of the busbar in the substation, winding data of the main transformer, and electrical parameter data of the transmission line;

[0041] Determining the voltage loss state information of the busbar according to the voltage data of the busbar and a preset voltage threshold;

[0042] Determine the overall substation voltage loss status information of the substation based on the voltage loss status information of the busbar, and determine the outage status information of the main transformer based on the winding data of the main transformer and the judgment information corresponding to the voltage level of the main transformer;

[0043] Determining the energized state information of the transmission line based on electrical parameter data of the transmission line, topological connection data of the transmission line, voltage loss state information of the busbar, and outage state information of the main transformer; the topological connection data represents the connection relationship between the transmission line and the equipment in the substation;

[0044] The state monitoring result of the power system is generated according to the voltage loss state information of the busbar, the voltage loss state information of the entire substation, the outage state information of the main transformer and the energized state information of the transmission line.

[0045] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the following steps:

[0046] Acquire real-time monitoring data of the power system; the real-time monitoring data includes voltage data of the busbar in the substation, winding data of the main transformer, and electrical parameter data of the transmission line;

[0047] Determining the voltage loss state information of the busbar according to the voltage data of the busbar and a preset voltage threshold;

[0048] Determine the overall substation voltage loss status information of the substation based on the voltage loss status information of the busbar, and determine the outage status information of the main transformer based on the winding data of the main transformer and the judgment information corresponding to the voltage level of the main transformer;

[0049] Determining the energized state information of the transmission line based on electrical parameter data of the transmission line, topological connection data of the transmission line, voltage loss state information of the busbar, and outage state information of the main transformer; the topological connection data represents the connection relationship between the transmission line and the equipment in the substation;

[0050] The state monitoring result of the power system is generated according to the voltage loss state information of the busbar, the voltage loss state information of the entire substation, the outage state information of the main transformer and the energized state information of the transmission line.

[0051] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the following steps:

[0052] Acquire real-time monitoring data of the power system; the real-time monitoring data includes voltage data of the busbar in the substation, winding data of the main transformer, and electrical parameter data of the transmission line;

[0053] Determining the voltage loss state information of the busbar according to the voltage data of the busbar and a preset voltage threshold;

[0054] Determine the overall substation voltage loss status information of the substation based on the voltage loss status information of the busbar, and determine the outage status information of the main transformer based on the winding data of the main transformer and the judgment information corresponding to the voltage level of the main transformer;

[0055] Determining the energized state information of the transmission line based on electrical parameter data of the transmission line, topological connection data of the transmission line, voltage loss state information of the busbar, and outage state information of the main transformer; the topological connection data represents the connection relationship between the transmission line and the equipment in the substation;

[0056] The state monitoring result of the power system is generated according to the voltage loss state information of the busbar, the voltage loss state information of the entire substation, the outage state information of the main transformer and the energized state information of the transmission line.

[0057] The above-mentioned method, apparatus, computer equipment, computer-readable storage medium, and computer program product for state monitoring of a power system obtain real-time monitoring data of the power system; the real-time monitoring data includes voltage data of a busbar in a substation, winding data of a main transformer, and electrical parameter data of a transmission line; based on the voltage data of the busbar and a preset voltage threshold, the busbar's de-voltage status information is determined; based on the busbar's de-voltage status information, the substation's entire station de-voltage status information is determined, and based on the judgment information corresponding to the winding data of the main transformer and the voltage level of the main transformer, the main transformer's outage status information is determined; based on the electrical parameter data of the transmission line, the transmission line's topological connection data, the busbar's de-voltage status information, and the main transformer's outage status information, the transmission line's energized status information is determined; the topological connection data represents the connection relationship between the transmission line and the equipment in the substation; based on the busbar's de-voltage status information, the substation's entire station de-voltage status information, the main transformer's outage status information, and the transmission line's energized status information, the transmission line is generated. This solution monitors the power system status through multi-source data fusion analysis. It starts with obtaining bus voltage data, main transformer winding data and transmission line electrical parameter data, and then judges the undervoltage state, station-wide undervoltage state, outage state and energized state in sequence, forming a progressive monitoring process. This is conducive to making effective judgments when a single data source is missing or unreliable. At the same time, by introducing a combination of topological connection data and electrical parameter data, data cross-validation is achieved, which is conducive to improving the efficiency and accuracy of power system status monitoring in complex system environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0059] Figure 1 1 is a flow chart of a method for monitoring the state of a power system according to an embodiment;

[0060] Figure 2 1 is a flow chart of steps for determining outage status information of a main transformer in one embodiment;

[0061] Figure 3 1. It is a flowchart of the steps of determining the outage status information of the main transformer in another embodiment;

[0062] Figure 4 is a structural block diagram of a state monitoring device for a power system in one embodiment;

[0063] Figure 5 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0065] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0066] In an exemplary embodiment, Figure 1 As shown, a method for state monitoring of a power system is provided. This embodiment uses the method applied to a terminal as an example for illustration. It is understandable that the method can also be applied to a server, and can also be applied to a system including a terminal and a server, and is implemented through interaction between the terminal and the server. The terminal can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, etc. The server can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services. In this embodiment, the method includes the following steps:

[0067] Step S101 , obtaining real-time monitoring data of the power system; the real-time monitoring data includes voltage data of the busbar in the substation, winding data of the main transformer, and electrical parameter data of the transmission line.

[0068] Step S102: Determine the voltage loss status information of the bus according to the voltage data of the bus and a preset voltage threshold.

[0069] Step S103, determining the substation-wide voltage loss status information based on the busbar voltage loss status information, and determining the main transformer outage status information based on the main transformer winding data and the judgment information corresponding to the main transformer voltage level.

[0070] Step S104, determining the energized state information of the transmission line based on the electrical parameter data of the transmission line, the topological connection data of the transmission line, the voltage loss state information of the busbar, and the outage state information of the main transformer; the topological connection data represents the connection relationship between the transmission line and the equipment in the substation.

[0071] Step S105 , generating a power system status monitoring result based on the busbar depressurization status information, the substation-wide depressurization status information, the main transformer outage status information, and the power transmission line energization status information.

[0072] Among them, the power system can be an electric energy transmission and distribution network composed of substations, transmission lines and other power equipment. For example, the power system can be a power grid system composed of substations of different voltage levels, transmission lines connecting the substations and power equipment.

[0073] Among them, the real-time monitoring data can be the power system operating parameters collected in real time by the monitoring system. For example, the real-time monitoring data can be real-time power parameters including the voltage data of the bus in the substation, the winding data of the main transformer and the electrical parameter data of the transmission line.

[0074] Among them, the substation can be a facility in the power system used for conversion, distribution and control of electric energy voltage levels. For example, the substation can be a power hub station that includes multiple voltage level buses, main transformers and distribution equipment.

[0075] The busbar may be a conductor for collecting and distributing electric energy in a substation. For example, the busbar may be a common connection point for connecting various electrical devices in a substation, and is used for collecting and distributing electric energy.

[0076] The voltage data may be data representing a voltage value on a bus, for example, the voltage data may be a real-time value of a three-phase voltage (Ua, Ub, Uc) of the bus.

[0077] Among them, the main transformer can be the main transformer in the substation, which is used for power conversion between different voltage levels. For example, the main transformer can be the equipment in the substation that reduces high voltage to medium or low voltage or increases low voltage to high voltage.

[0078] The winding data may be electrical parameter data of the windings inside the main transformer, for example, the winding data may be voltage data (Ua, Ub, Uc), active power (P), reactive power (Q) and three-phase current data (Ia, Ib, Ic) of the high, medium and low voltage side windings of the main transformer.

[0079] The transmission line may be a conductor that connects different substations to transmit electric energy. For example, the transmission line may be a high-voltage or extra-high-voltage line used to transmit electric energy over long distances.

[0080] The electrical parameter data may be data representing electrical characteristics of a power transmission line, for example, the electrical parameter data may be voltage, active power (P), reactive power (Q), and current of the line.

[0081] Among them, the preset voltage threshold can be a reference value for judging whether the voltage is normal. For example, the preset voltage threshold can be 20% of the bus rated voltage, which is used to judge whether the bus is in a voltage-loss state.

[0082] The voltage loss status information may be information indicating whether the busbar has lost normal voltage. For example, the voltage loss status information may be information indicating that the busbar is completely voltage-depleted or partially energized.

[0083] The whole-station undervoltage status information may be information indicating whether all buses in the substation are in an undervoltage state. For example, the whole-station undervoltage status information may be information indicating that all three phases (Ua, Ub, Uc) of all buses of all voltage levels in the substation are in an undervoltage state.

[0084] Among them, the judgment information corresponding to the voltage level can be information for judging the operating status of the main transformer according to different voltage levels. For example, the judgment information corresponding to the voltage level can be different judgment standards set for 500kV (kilovolts) and above main transformers and 220kV and below main transformers.

[0085] Among them, the outage status information can be information indicating whether the main transformer has stopped operating. For example, the outage status information can be the main transformer operating status information determined by judging parameters such as the three-phase voltage, active power, reactive power and current of the main transformer winding.

[0086] Among them, topological connection data can be data that represents the physical connection relationship between the various components of the power system. For example, topological connection data can be data that represents the connection relationship between the transmission line and the equipment in the substation (such as busbar, main transformer, etc.) and the status information of switches and circuit breakers on the connection path.

[0087] Among them, the energized status information can be information indicating whether the transmission line is energized. For example, the energized status information can be information on whether the line is energized and the reliability of the status determined by comprehensively judging the electrical parameters, topological connection relationship and status of related equipment of the transmission line.

[0088] Among them, the status monitoring results can be a comprehensive analysis result of the operating status of each component of the power system. For example, the status monitoring results can be a comprehensive analysis result including the pressure loss of each substation bus, the substation that has lost pressure in the entire station and its importance, the number and capacity of the outage main transformers, and the energized status of the transmission line.

[0089] Optionally, the terminal first collects real-time monitoring data from various measurement points in the power system through the monitoring system at a predetermined collection frequency and transmits the real-time monitoring data to the monitoring system's data processing center via a communication network. The real-time monitoring data includes bus voltage data within the substation, main transformer winding data, and transmission line electrical parameter data. The terminal then obtains the rated bus voltage value, prioritizing the bus voltage level from the CIM (Common Information Model), the bus name, the bus rated voltage from the equipment center, and the voltage levels of other bays connected to the bus. The terminal then sets a preset voltage threshold of 20% of the bus rated voltage value. The terminal then determines whether the voltage values of all three bus phases (phase A voltage Ua, phase B voltage Ub, and phase C voltage Uc) are less than a preset voltage threshold. If all phase voltages are less than the preset voltage threshold, the bus is deemed to be de-voltaged. If any phase voltage is not less than the preset voltage threshold, the bus is deemed to be partially de-voltaged and the de-voltaged state is recorded. Furthermore, the terminal traverses and analyzes the voltage loss status information for all buses at all voltage levels within the substation. If all three phases (Ua, Ub, and Uc) of all busbars and voltage levels within the substation are in a voltage loss state, the substation is determined to have experienced a station-wide voltage loss. If any busbar is not completely voltage-depleted, the substation is determined to have not experienced a station-wide voltage loss and the station-wide voltage loss status information is recorded. Simultaneously, the terminal obtains the main transformer list and its associated winding list within the substation, as well as the rated voltage of the main transformer. The rated voltage of the main transformer is determined in the following order: obtaining the main transformer voltage level from the CIM model, obtaining the voltage level from the main transformer name, obtaining the voltage level from the substation, and obtaining the main transformer rated voltage from the equipment center. Based on the judgment information corresponding to the voltage level of the main transformer, the terminal adopts different judgment logic: for main transformers of 500kV and above, it judges whether the three-phase voltage of each winding (high, medium and low side windings) under the main transformer is less than 20% of the rated voltage of the main transformer. If the three-phase voltage of each winding is less than this value, the main transformer is determined to be out of service; for main transformers of 220kV and below, if the three-phase voltage data of the windings under the main transformer can be obtained, it judges whether the three-phase voltage of all windings is less than 20% of the rated voltage of the main transformer. If so, the main transformer is determined to be out of service; otherwise, it is determined to be in service. If the three-phase voltage data cannot be obtained, it checks whether the winding P (active power), Q (reactive power), three-phase current data Ia (phase A current), Ib (phase B current), and Ic (phase C current) are all zero. If all are zero, the main transformer is determined to be out of service and the outage status information of the main transformer is recorded. Subsequently, the terminal obtains the topological connection data of the transmission lines and the equipment in the substation, queries the list of transmission lines connected to the substation according to the substation, obtains the rated voltage of each line, obtains the connection relationship between the transmission lines and the equipment in the substation (such as busbars, main transformers, etc.), and obtains the status information of switches and circuit breakers on the connection path.Finally, the terminal determines the energized state information of the transmission line through comprehensive judgment based on the electrical parameter data of the transmission line, topological connection data, busbar devoltage status information and main transformer outage status information, and generates power system status monitoring results including equipment status statistics, abnormal equipment list and system risk assessment based on the busbar devoltage status information, substation-wide devoltage status information, main transformer outage status information and transmission line energized state information.

[0090] In the above-mentioned state monitoring method for the power system, real-time monitoring data of the power system is obtained; the real-time monitoring data includes the voltage data of the bus in the substation, the winding data of the main transformer and the electrical parameter data of the transmission line; the bus voltage data and the preset voltage threshold are used to determine the bus voltage loss status information; based on the bus voltage data and the preset voltage threshold, the substation-wide station voltage loss status information is determined, and based on the main transformer winding data and the judgment information corresponding to the main transformer voltage level, the main transformer outage status information is determined; based on the electrical parameter data of the transmission line, the topological connection data of the transmission line, the bus voltage loss status information and the main transformer outage status information, the transmission line energized state information is determined; the topological connection data represents the connection relationship between the transmission line and the equipment in the substation; based on the bus voltage loss status information, the substation-wide station voltage loss status information, the main transformer outage status information and the transmission line energized state information, the power system state monitoring results are generated. This solution monitors the power system status through multi-source data fusion analysis. It starts with obtaining bus voltage data, main transformer winding data and transmission line electrical parameter data, and then judges the undervoltage state, station-wide undervoltage state, outage state and energized state in sequence, forming a progressive monitoring process. This is conducive to making effective judgments when a single data source is missing or unreliable. At the same time, by introducing a combination of topological connection data and electrical parameter data, data cross-validation is achieved, which is conducive to improving the efficiency and accuracy of power system status monitoring in complex system environments.

[0091] In an exemplary embodiment, referring to Figure 2 , according to the judgment information corresponding to the winding data of the main transformer and the voltage level of the main transformer, the outage status information of the main transformer is determined, which specifically includes the following contents:

[0092] Step S201, determining target judgment information from judgment information according to the voltage level of the main transformer;

[0093] Step S202: Determine the outage status information of the main transformer according to the target judgment information and the winding data of the main transformer.

[0094] Among them, the target judgment information can be a judgment rule or standard for a main transformer of a specific voltage level. For example, the target judgment information can be different judgment conditions and thresholds set for main transformers of 500kV and above or main transformers of 220kV and below.

[0095] The voltage level of the main transformer may be the rated voltage level of the main transformer. For example, the voltage level of the main transformer may be the main transformer voltage level obtained from the CIM model, the voltage level obtained from the main transformer name, the voltage level obtained from the substation, or the main transformer rated voltage obtained from the equipment center.

[0096] Optionally, the terminal first obtains the voltage level and winding data of the main transformer in the power system. The voltage level of the main transformer can be obtained in various ways, such as from the CIM model, from the main transformer name, from the substation, or from the equipment center. These methods are performed in order of priority. Then, based on the obtained main transformer voltage level, the terminal determines target judgment information from a pre-set judgment information set, where the judgment information set contains different judgment criteria corresponding to main transformers of different voltage levels. Specifically, if the main transformer voltage level is 500 kV or above, the terminal determines whether the three-phase voltage of each winding (high, medium, and low) is less than 20% of the transformer's rated voltage. If the main transformer voltage level is 220 kV or below, the terminal determines two types of target judgment information: one is to determine whether the three-phase voltage of all windings is less than 20% of the transformer's rated voltage when three-phase voltage data is available; the other is to determine whether the active power (P), reactive power (Q), and three-phase current (Ia, Ib, and Ic) of the main transformer windings are all zero when three-phase voltage data is unavailable. Finally, the terminal determines the main transformer's outage status based on the determined target judgment information and the acquired main transformer winding data.

[0097] The technical solution provided in this embodiment, by selecting corresponding judgment information according to the voltage level of the main transformer, is conducive to adopting differentiated judgment logic for main transformers of different voltage levels, solving the problem that a single judgment standard cannot adapt to the characteristics of main transformers of different voltage levels, thereby facilitating improving the accuracy of the judgment of the main transformer outage status.

[0098] In an exemplary embodiment, referring to Figure 3 , according to the voltage level of the main transformer, the target judgment information is determined from the judgment information, specifically including the following contents:

[0099] Step S301: when the voltage level of the main transformer is a first preset voltage level or a level higher than the first preset voltage level, determining first judgment information from the judgment information as target judgment information;

[0100] According to the target judgment information and the winding data of the main transformer, the outage status information of the main transformer is determined, which specifically includes the following:

[0101] Step S302: When the target judgment information is the first judgment information, it is determined whether the three-phase voltage value of each winding of the main transformer is less than a preset percentage of the rated voltage value of the main transformer;

[0102] Step S303 : When the three-phase voltage value of each winding of the main transformer is less than a preset percentage of the rated voltage value of the main transformer, it is determined that the outage state information of the main transformer is that the main transformer is in an outage state.

[0103] The first preset voltage level may be a specific voltage level threshold of the main transformer. For example, the first preset voltage level may be 500 kV, which is used to distinguish between main transformers of high voltage level and medium and low voltage levels.

[0104] Among them, the first judgment information can be a judgment rule for a high-voltage main transformer. For example, the first judgment information can be a judgment rule for judging whether the three-phase voltage of each winding (high, medium and low side windings) under the main transformer is less than 20% of the rated voltage of the main transformer.

[0105] Among them, each winding can be a coil component used for power conversion in the main transformer. For example, each winding can be the high-voltage side winding, medium-voltage side winding and low-voltage side winding (high, medium and low side windings) of the main transformer.

[0106] The three-phase voltage value may be a voltage value representing the three-phase power of the main transformer winding. For example, the three-phase voltage value may be a real-time value of the three-phase voltages Ua, Ub, and Uc of the main transformer winding.

[0107] The rated voltage value may be the nominal operating voltage value of the main transformer. For example, the rated voltage value may be the main transformer voltage level obtained from the CIM model, the voltage level obtained from the main transformer name, the voltage level obtained from the substation, or the main transformer rated voltage obtained from the equipment center.

[0108] The preset percentage may be a proportional threshold value for determining whether the voltage is abnormal. For example, the preset percentage may be 20%, which is used to determine whether the voltage of the main transformer winding is lower than 20% of the rated voltage.

[0109] The outage state may be an operating state in which the main transformer is not operating.

[0110] Optionally, the terminal first checks the voltage level of the main transformer to determine whether it belongs to a first preset voltage level or a level above the first preset voltage level, where the first preset voltage level can be set to 500kV. When the terminal determines that the voltage level of the main transformer is 500kV or higher, the terminal determines the target judgment information as the first judgment information from the pre-set judgment information, that is, the dedicated judgment logic for main transformers of 500kV and above. Then, the terminal begins to judge the outage status of the main transformer based on the first judgment information. The specific steps are as follows: first, obtain the rated voltage value of the main transformer, and determine the rated voltage value of the main transformer according to the priority of obtaining the main transformer voltage level from the CIM model, obtaining the voltage level from the main transformer name, obtaining the voltage level from the substation, and obtaining the rated voltage of the main transformer from the equipment center. Then, the terminal calculates a preset percentage of the rated voltage value of the main transformer, which is usually set to 20% of the rated voltage value of the main transformer as the judgment threshold. The terminal then obtains the three-phase voltage data (Ua, Ub, and Uc) for all windings of the main transformer (including high-voltage, medium-voltage, and low-voltage windings) and compares these voltage values with the calculated judgment threshold to determine whether the three-phase voltage values of each winding of the main transformer are less than a preset percentage of the rated voltage of the main transformer. Finally, if all phase voltages of all windings of the main transformer are less than the judgment threshold, the terminal determines that the main transformer's outage status information indicates that the main transformer is in an outage state; otherwise, the terminal determines that the main transformer's outage status information indicates that the main transformer is in an operating state.

[0111] The technical solution provided in this embodiment selectively applies the first judgment information according to the voltage level of the main transformer, and adopts a three-phase voltage threshold judgment method specifically for main transformers with high voltage levels (first preset voltage level and above), which is conducive to efficiently handling the special working characteristics of high-voltage main transformers; by detecting whether the voltage values of all windings of the main transformer are lower than the preset percentage, it is conducive to comprehensively evaluating the status of various parts of the main transformer, thereby improving the accuracy of the judgment of the outage status.

[0112] In an exemplary embodiment, target judgment information is determined from the judgment information according to the voltage level of the main transformer, specifically including the following contents: when the voltage level of the main transformer is the second preset voltage level or a level below the second preset voltage level, the second judgment information is determined from the judgment information as the target judgment information; according to the target judgment information and the winding data of the main transformer, the outage status information of the main transformer is determined, specifically including the following contents: when the target judgment information is the second judgment information, it is judged whether the active power, reactive power and three-phase current data of the winding of the main transformer are zero; when the active power, reactive power and three-phase current data of the winding of the main transformer are all zero, it is determined that the outage status information of the main transformer is that the main transformer is in an outage state; when the active power, reactive power and three-phase current data of the winding of the main transformer are not all zero, the outage status information of the main transformer is determined according to the voltage data of the bus in the main transformer and the switch status information of the main transformer.

[0113] Among them, the second preset voltage level can be a specific voltage level threshold of the main transformer, which is used to distinguish between medium and low voltage levels and high voltage levels of main transformers. For example, the second preset voltage level can be 220kV, which is used to identify main transformers of 220kV and below voltage levels.

[0114] Among them, the second judgment information can be a judgment rule or standard for medium and low voltage main transformers. For example, the second judgment information can be a judgment rule that prioritizes checking whether the active power, reactive power and three-phase current data of the main transformer winding are zero.

[0115] The active power may be the actual available electric power transmitted by the main transformer winding. For example, the active power may be the actual power value of the main transformer winding represented by P.

[0116] The reactive power may be the electric power generated in the main transformer winding that does not do work. For example, the reactive power may be the reactive power value of the main transformer winding represented by Q.

[0117] The three-phase current data may be the current value of the three-phase alternating current flowing in the main transformer winding. For example, the three-phase current data may be the real-time values of the three-phase currents Ia, Ib, and Ic of the main transformer winding.

[0118] The switch status information may indicate the working status of the device connected between the main transformer and the busbar. For example, the switch status information may indicate whether the switch or circuit breaker on the topological link from the main transformer to the busbar is closed.

[0119] The bus voltage data may be a voltage measurement value of the bus in the substation. For example, the bus voltage data may be a real-time value of the three-phase voltage (Ua, Ub, Uc) of the bus.

[0120] Optionally, the terminal first obtains the voltage level of the main transformer and compares it with a preset second voltage level (e.g., 220 kV). If the voltage level of the main transformer is 220 kV or below, the terminal determines from preconfigured judgment information that the target judgment information is the second judgment information, i.e., the judgment rule for main transformers of 220 kV and below. The terminal then begins to determine the outage status of the main transformer based on the second judgment information. Specifically, the terminal first checks the active power (P), reactive power (Q), and three-phase current data (Ia, Ib, Ic) of the main transformer's windings to determine whether these parameters are all zero. If the terminal detects that the active power, reactive power, and three-phase current data of the main transformer's windings are all zero, the terminal directly determines that the outage status of the main transformer is that the main transformer is in an outage state. However, if the terminal identifies non-zero values in the active power, reactive power, and three-phase current data of the main transformer's windings, the terminal obtains the voltage data of the bus connected to the main transformer, including the real-time values of the bus's three-phase voltages (Ua, Ub, Uc), and simultaneously obtains the main transformer's switch status information, including the closed status of the switches and circuit breakers on the main transformer-bus topology link. The terminal comprehensively determines the main transformer's outage status information by analyzing the voltage data of the bus in the main transformer and the main transformer's switch status information.

[0121] The technical solution provided in this embodiment is beneficial to improving the accuracy of the outage status judgment of medium and low voltage main transformers by setting up separate outage judgment methods for medium and low voltage main transformers and introducing bus voltage and switch status as auxiliary judgment criteria for ambiguous judgment situations.

[0122] In an exemplary embodiment, the busbar's voltage loss status information is determined based on the busbar's voltage data and a preset voltage threshold, specifically including the following: obtaining the busbar's three-phase voltage value from the busbar's voltage data; when the busbar's three-phase voltage values are all less than the preset voltage threshold, determining the busbar's voltage loss status information as the busbar is in a voltage loss state; when any phase voltage value of the busbar is greater than or equal to the preset voltage threshold, determining the busbar's voltage loss status information as the busbar is in a partially energized state.

[0123] The voltage loss state may be a state where the busbar is not energized or the voltage is lower than the normal operating range.

[0124] Among them, the partially energized state can be a state in which some phases of the bus still have voltage. For example, the partially energized state can be a state in which the voltage value of at least one phase of the bus is greater than or equal to a preset voltage threshold (usually 20% of the rated voltage).

[0125] Optionally, the terminal first obtains bus voltage data from the power system's real-time monitoring system via a communication interface. This voltage data specifically includes the real-time values of the bus's three-phase voltages (Ua, Ub, and Uc). Subsequently, after determining the bus's rated voltage, the terminal calculates a preset voltage threshold, setting it to 20% of the bus's rated voltage. Next, the terminal extracts the bus's three-phase voltage values (Ua, Ub, and Uc) from the bus's voltage data and compares these three-phase voltage values with the preset voltage thresholds. If all three-phase bus voltage values are less than the preset voltage threshold (i.e., all phase voltages are less than 20% of the rated voltage), the terminal determines the bus's de-voltage status as a complete de-voltage state. If any phase voltage value of the bus is greater than or equal to the preset voltage threshold, the terminal determines the bus's de-voltage status as a partially energized state.

[0126] The technical solution provided in this embodiment is conducive to accurately identifying the complete de-voltage state and partially energized state of the busbar by analyzing the comparison results of the three-phase voltage values and the preset voltage thresholds, thereby improving the accuracy of the grid operation status identification.

[0127] In an exemplary embodiment, the whole-station undervoltage status information of the substation is determined based on the undervoltage status information of the busbar, specifically including the following contents: judging whether all busbars in the substation are in an undervoltage state based on the undervoltage status information of the busbar; when all busbars in the substation are in an undervoltage state, determining the whole-station undervoltage status information of the substation is that the substation is in an undervoltage state; when any busbar in the substation is in a partially energized state, determining the whole-station undervoltage status information of the substation is that the substation is not in an undervoltage state.

[0128] Among them, the substation-wide pressure loss status information can be a status description indicating whether the substation as a whole has lost pressure. For example, the substation-wide pressure loss status information can be information describing whether all busbars of the substation are in a pressure loss state, which is used to indicate whether the entire substation has completely lost power supply.

[0129] Among them, the whole station voltage loss state can be a state in which all busbars of all voltage levels in the substation are under voltage. For example, the whole station voltage loss state can refer to the situation in which all three-phase voltages (Ua, Ub, Uc) of all busbars and all voltage levels in the substation are under voltage, indicating that the entire substation has completely lost power supply.

[0130] Among them, all busbars can refer to all busbar equipment of various voltage levels in the substation. For example, all busbars can refer to the collection of busbar equipment of all voltage levels such as high-voltage side busbar, medium-voltage side busbar and low-voltage side busbar in a substation.

[0131] Optionally, after determining the busbar undervoltage status, the terminal further determines whether the substation is experiencing a station-wide undervoltage condition. The terminal first obtains the substation's complete busbar list, including all busbars at all voltage levels within the substation, such as high-voltage, medium-voltage, and low-voltage buses. Then, based on the previously determined busbar undervoltage status information, the terminal performs a traversal analysis of all busbars within the substation, detecting the undervoltage status of each busbar. During this traversal, the terminal checks whether each busbar within the substation is undervoltage. This requires determining whether all three-phase voltages of all buses within all voltage levels within the substation are undervoltage. If the terminal confirms that all buses within the substation are undervoltage, meaning that the three-phase voltages (Ua, Ub, and Uc) of all buses within all voltage levels within the substation are less than their respective preset voltage thresholds, the terminal determines that the substation's station-wide undervoltage condition is undervoltage. If the terminal identifies that any bus in the substation is in a partially energized state, that is, any phase voltage value of any bus is greater than or equal to its corresponding preset voltage threshold, the terminal determines that the substation's entire station depressurization status information is that the substation is not in a entire station depressurization state.

[0132] The technical solution provided in this embodiment is conducive to accurately distinguishing between the full-station and partial-station pressure loss states of the substation through comprehensive analysis and judgment of the pressure loss states of all buses in the substation, thereby improving the accuracy of substation status identification and enhancing the safety of power grid operation.

[0133] The following uses an application example to illustrate the state monitoring method for a power system provided by this application. This application example uses the method applied to a terminal as an example.

[0134] As power systems continue to expand in size and complexity, their safe and stable operation becomes increasingly important. Power system condition monitoring, a key technology for ensuring safe operation, has become a core component of modern grid management. Real-time condition monitoring of substation equipment and transmission lines, in particular, is crucial for promptly detecting and addressing abnormalities in the power system and preventing widespread power outages. Therefore, accurately monitoring power system condition has become a crucial research topic.

[0135] The process of this application example is as follows:

[0136] Obtain real-time monitoring data of the power system; real-time monitoring data includes voltage data of the busbar in the substation, winding data of the main transformer, and electrical parameter data of the transmission line;

[0137] Determine the busbar voltage loss state based on the comparison result between the busbar voltage data and the preset voltage threshold;

[0138] According to the busbar pressure loss status, when all buses in the substation lose pressure, the whole substation pressure loss status is determined;

[0139] Determine the outage status of the main transformer based on the winding data of the main transformer and the judgment information corresponding to the voltage level;

[0140] Obtaining topological connection data of the transmission line; the topological connection data represents the connection relationship between the transmission line and the equipment in the substation;

[0141] Determine the energized state of the transmission line based on the electrical parameter data, topological connection data, busbar voltage loss state, and main transformer outage state of the transmission line;

[0142] The power system status monitoring results are generated based on the busbar's depressurization status, the main transformer's outage status, and the energized status of the transmission line.

[0143] The specific contents of this application example are as follows:

[0144] 1. Obtain real-time monitoring data of the power system.

[0145] The monitoring system is used to obtain real-time monitoring data of the power system, including:

[0146] Bus voltage data: including real-time values of bus three-phase voltage (Ua, Ub, Uc).

[0147] Main transformer winding data: including voltage data (Ua, Ub, Uc), active power (P), reactive power (Q) and three-phase current data (Ia, Ib, Ic) of the high, medium and low voltage side windings of the main transformer.

[0148] Electrical parameter data of the transmission line: including line voltage (voltage U, Ua, Ub, Uc, AB phase-to-phase voltage Uab, AC phase-to-phase voltage Uac, BC phase-to-phase voltage Ubc), active power (P), reactive power (Q) and current (I, Ia, Ib, Ic).

[0149] During the data acquisition process, the system (terminal) collects data from each measurement point according to the predetermined collection frequency and transmits it to the data processing center of the monitoring system through the communication network.

[0150] 2. Determine the busbar's pressure loss status.

[0151] Based on the acquired bus voltage data, the system (terminal) performs the following judgment process: obtain the rated voltage value of the bus and determine it in the following order of priority: obtain the bus voltage level from the CIM model as the rated voltage; obtain the voltage level from the bus name as the rated voltage; obtain the bus rated voltage from the equipment center; obtain the voltage level of other bays connected to the bus as the rated voltage; set the preset voltage threshold to 20% of the bus rated voltage.

[0152] Determine whether the voltage values of the three phases (Ua, Ub, Uc) of the bus are all less than the preset voltage threshold: if all phase voltages are less than the threshold, the bus is determined to be in a de-voltage state; if any phase voltage is not less than the threshold, the bus is determined to be not completely de-voltaged and the phase may be energized; the judgment result records the de-voltage state of the bus, including complete de-voltaged or partially energized state.

[0153] 3. Determine the voltage loss status of the entire substation.

[0154] After completing the judgment of the voltage loss status of all buses in the substation, the system further determines the voltage loss status of the entire substation: traversing and analyzing the voltage loss status of all buses of all voltage levels in the substation; if all buses and three phases (Ua, Ub, Uc) of all voltage levels in the station are in the voltage loss state, the substation is determined to be the entire station voltage loss; if any bus is not completely voltage loss, the substation is determined not to be the entire station voltage loss.

[0155] The judgment result records the voltage loss status of the entire substation, providing a basis for subsequent status monitoring and analysis.

[0156] 4. Determine the shutdown status of the main transformer.

[0157] Determine the outage status of the main transformer based on the obtained main transformer winding data and the corresponding voltage level. Obtain the main transformer list and winding list information within the substation. Obtain the main transformer rated voltage in the following order of priority: obtain the main transformer voltage level from the CIM model as the rated voltage; obtain the voltage level from the main transformer name as the rated voltage; obtain the voltage level from the substation as the rated voltage; and obtain the main transformer rated voltage from the equipment center.

[0158] Different judgment logics are adopted according to the voltage level of the main transformer:

[0159] For main transformers of 500kV and above: Determine whether the three-phase voltage of each winding (high, medium and low side windings) under the main transformer is less than 20% of the rated voltage of the main transformer. If the three-phase voltage of each winding is less than this value, the main transformer is determined to be out of service; otherwise, the main transformer is determined to be in service.

[0160] For main transformers of 220kV and below: If the three-phase voltage data of the main transformer's lower windings can be obtained, determine whether the three-phase voltages of all windings are less than 20% of the main transformer's rated voltage. If so, the main transformer is considered out of service; otherwise, it is considered operational. If the three-phase voltage data cannot be obtained, check whether the winding's P, Q, Ia, Ib, and Ic are all zero. If so, the main transformer is considered out of service. If not, check the voltage and topological connection of the busbars on both sides of the main transformer. If any phase voltage on the busbar on either side of the main transformer is no less than 20% of the rated voltage, and the switches and circuit breakers in the main transformer-to-busbar topological link are closed, the main transformer is considered operational; otherwise, it is considered out of service.

[0161] The judgment result records the outage status of the main transformer and provides a basis for subsequent status analysis.

[0162] 5. Obtain topological connection data of transmission lines.

[0163] Obtain topological connection data between transmission lines and substation equipment: Query the list of transmission lines connected to the substation based on the substation; obtain the rated voltage of each line (usually derived from the line voltage level, such as 220kV); obtain the connection relationship between transmission lines and substation equipment (such as busbars, main transformers, etc.); and obtain the status information of switches and circuit breakers along the connection path.

[0164] The topological connection data includes the connection path of the transmission line from the substation entry point to the busbar or main transformer within the station and the status of all isolation devices on the path.

[0165] 6. Determine the energized status of the transmission line.

[0166] Based on the electrical parameter data, topological connection data, busbar voltage loss status, and main transformer outage status of the transmission line, the following steps are used to determine the energized status of the transmission line:

[0167] Judgment based on line electrical parameters: First, determine whether the line voltage (U, Ua, Ub, Uc, Uab, Uac, Ubc) is undervoltage (less than 20% of the rated voltage). If all voltage parameters show undervoltage, the line is preliminarily determined to be de-energized. If any voltage parameter is not undervoltage, the line is determined to be energized.

[0168] Supplementary judgment when voltage data is missing: If line voltage data cannot be obtained, check the line power P and current I (I, Ia, Ib, Ic). If either P or I is not zero and is greater than 50% of the previous cycle value, the line is determined to be energized. Otherwise, proceed to the next judgment step.

[0169] Comprehensive judgment based on topological connectivity: Starting from the junction of the line and the substation, perform a topological analysis toward the substation. If the topological path is disconnected, the line's energized status is determined solely based on the line's real-time data. If the topological path is connected and the busbar can be traced: Check whether the busbar is energized (any phase voltage is not less than 20% of the rated voltage); check whether the switches and circuit breakers on the topological path are closed; if the busbar is energized and the circuit breakers are closed, the line should be energized; if this is consistent with the actual measured data, confirm the line's energized status; otherwise, mark the status as abnormal. If the topological path is connected and the main transformer can be traced: Check whether the main transformer winding is energized (any P, Q, or I item is not 0); check whether the switches and circuit breakers on the topological path are closed; if the main transformer is energized and the circuit breaker is closed, the line should be energized; if this is consistent with the actual measured data, confirm the line's energized status; otherwise, mark the status as abnormal.

[0170] If conditions permit, check the line voltage value of the opposite substation as a basis for further judgment.

[0171] The final judgment result records whether the line is energized and the reliability of the judgment status, such as: energized (true / false) and status code (1 / 2 / 4 / 8).

[0172] 7. Generate status monitoring results of the power system.

[0173] Based on the busbar de-voltage status, substation-wide de-voltage status, main transformer outage status and transmission line energized status determined in the previous steps, the power system status monitoring results are comprehensively generated: the de-voltage conditions of all buses in each substation are summarized, and the de-voltage buses and their voltage levels are identified; the substations with station-wide de-voltage conditions and their importance are identified; the number and capacity of all outage main transformers and their impact on the system are counted; the energized status of the transmission lines is analyzed, with special attention paid to abnormal conditions of important lines; and a system status monitoring report is generated, including equipment status statistics, a list of abnormal equipment, and a system risk assessment.

[0174] Status monitoring results can be displayed in real time through the interface, and reports can be generated regularly or alarms can be triggered when abnormal events occur.

[0175] The technical solution provided in this application example establishes a multi-level, multi-dimensional power system status monitoring mechanism by acquiring real-time monitoring data from multiple sources of the power system (including busbar voltage data, main transformer winding data, and transmission line electrical parameter data). When determining the energized state of a transmission line, this solution not only considers the line's own electrical parameters but also incorporates topological connection data. This comprehensive analysis, combined with the determined busbar de-voltage status and main transformer outage status, effectively compensates for the unreliability of a single data source. This multi-source data fusion approach enables the system to maintain its judgment capabilities even when some data is missing or abnormal, while also improving the accuracy of judgments through data cross-validation, thereby enhancing the accuracy of power system status monitoring.

[0176] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0177] Based on the same inventive concept, an embodiment of the present application further provides a state monitoring device for a power system for implementing the aforementioned state monitoring method for a power system. The implementation solution provided by the device is similar to the implementation solution described in the aforementioned method. Therefore, the specific limitations in one or more embodiments of the state monitoring device for a power system provided below can be found in the above-mentioned limitations of the state monitoring method for a power system, and will not be repeated here.

[0178] In an exemplary embodiment, Figure 4 As shown, a state monitoring device for a power system is provided. The state monitoring device 400 for a power system may include:

[0179] The data acquisition module 401 is used to acquire real-time monitoring data of the power system; the real-time monitoring data includes the voltage data of the busbar in the substation, the winding data of the main transformer and the electrical parameter data of the transmission line;

[0180] A first determining module 402 is configured to determine bus voltage loss status information based on bus voltage data and a preset voltage threshold;

[0181] The second determining module 403 is configured to determine the substation-wide voltage loss status information based on the busbar voltage loss status information, and determine the main transformer outage status information based on the main transformer winding data and the judgment information corresponding to the main transformer voltage level;

[0182] A third determining module 404 is configured to determine the energized state information of the transmission line based on the electrical parameter data of the transmission line, the topological connection data of the transmission line, the voltage loss state information of the busbar, and the outage state information of the main transformer; the topological connection data indicates the connection relationship between the transmission line and the equipment in the substation;

[0183] The result generation module 405 is used to generate the power system status monitoring result based on the busbar depressurization status information, the substation-wide depressurization status information, the main transformer outage status information and the power transmission line energization status information.

[0184] In an exemplary embodiment, the second determination module 403 is further configured to determine target judgment information from the judgment information according to the voltage level of the main transformer; and determine the outage status information of the main transformer according to the target judgment information and the winding data of the main transformer.

[0185] In an exemplary embodiment, the second determination module 403 is also used to determine the first judgment information from the judgment information as the target judgment information when the voltage level of the main transformer is the first preset voltage level or a level above the first preset voltage level; when the target judgment information is the first judgment information, determine whether the three-phase voltage values of each winding under the main transformer are all less than the preset percentage of the rated voltage value of the main transformer; when the three-phase voltage values of each winding under the main transformer are all less than the preset percentage of the rated voltage value of the main transformer, determine that the outage status information of the main transformer is that the main transformer is in an outage state.

[0186] In an exemplary embodiment, the second determination module 403 is also used to determine the second judgment information from the judgment information as the target judgment information when the voltage level of the main transformer is the second preset voltage level or a level below the second preset voltage level; when the target judgment information is the second judgment information, determine whether the active power, reactive power and three-phase current data of the winding of the main transformer are zero; when the active power, reactive power and three-phase current data of the winding of the main transformer are all zero, determine the shutdown status information of the main transformer to be that the main transformer is in a shutdown state; when the active power, reactive power and three-phase current data of the winding of the main transformer are not all zero, determine the shutdown status information of the main transformer based on the voltage data of the bus in the main transformer and the switch status information of the main transformer.

[0187] In an exemplary embodiment, the first determination module 402 is also used to obtain the three-phase voltage value of the bus from the voltage data of the bus; when the three-phase voltage values of the bus are all less than the preset voltage threshold, the bus undervoltage status information is determined to be that the bus is in an undervoltage state; when any phase voltage value of the bus is greater than or equal to the preset voltage threshold, the bus undervoltage status information is determined to be that the bus is in a partially energized state.

[0188] In an exemplary embodiment, the second determination module 403 is further used to determine whether all busbars in the substation are in a depressurized state based on the depressurized state information of the busbar; when all busbars in the substation are in a depressurized state, the depressurized state information of the entire substation is determined to be that the substation is in a depressurized state; when any busbar in the substation is in a partially energized state, the depressurized state information of the entire substation is determined to be that the substation is not in a depressurized state.

[0189] Each module in the aforementioned power system condition monitoring device may be implemented in whole or in part through software, hardware, or a combination thereof. Each module may be embedded in or independent of a processor in a computer device in the form of hardware, or may be stored in a memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0190] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 5As shown. The computer device includes a processor, memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals via wired or wireless means, and the wireless means can be achieved via Wi-Fi, mobile cellular networks, NFC (near-field communication), or other technologies. When executed by the processor, the computer program implements a method for monitoring the condition of a power system. The display unit of the computer device is used to produce a visual image and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device casing, or an external keyboard, touchpad or mouse.

[0191] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0192] In an exemplary embodiment, a computer device is further provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0193] In an exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0194] In an exemplary embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0195] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), data processing logic devices based on quantum computing, and the like.

[0196] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0197] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for monitoring the state of a power system, characterized in that: The method comprises: Acquire real-time monitoring data of the power system; the real-time monitoring data includes voltage data of the busbar in the substation, winding data of the main transformer, and electrical parameter data of the transmission line; Determining the voltage loss state information of the busbar according to the voltage data of the busbar and a preset voltage threshold; Determine the overall substation voltage loss status information of the substation based on the voltage loss status information of the busbar, and determine the outage status information of the main transformer based on the winding data of the main transformer and the judgment information corresponding to the voltage level of the main transformer; Determining the energized state information of the transmission line based on electrical parameter data of the transmission line, topological connection data of the transmission line, voltage loss state information of the busbar, and outage state information of the main transformer; the topological connection data represents the connection relationship between the transmission line and the equipment in the substation; The state monitoring result of the power system is generated according to the voltage loss state information of the busbar, the voltage loss state information of the entire substation, the outage state information of the main transformer and the energized state information of the transmission line.

2. The method according to claim 1, characterized in that The determining the outage status information of the main transformer according to the winding data of the main transformer and the judgment information corresponding to the voltage level of the main transformer includes: determining target judgment information from the judgment information according to the voltage level of the main transformer; The outage status information of the main transformer is determined according to the target judgment information and the winding data of the main transformer.

3. The method according to claim 2, characterized in that The determining target judgment information from the judgment information according to the voltage level of the main transformer includes: When the voltage level of the main transformer is a first preset voltage level or a level higher than the first preset voltage level, determining first judgment information from the judgment information as the target judgment information; The determining, based on the target judgment information and the winding data of the main transformer, the outage status information of the main transformer includes: When the target judgment information is the first judgment information, determining whether the three-phase voltage value of each winding of the main transformer is less than a preset percentage of the rated voltage value of the main transformer; When the three-phase voltage value of each winding of the main transformer is less than a preset percentage of the rated voltage value of the main transformer, the outage status information of the main transformer is determined to be that the main transformer is in an outage state.

4. The method according to claim 2, characterized in that The determining target judgment information from the judgment information according to the voltage level of the main transformer includes: When the voltage level of the main transformer is a second preset voltage level or a level lower than the second preset voltage level, determining second judgment information from the judgment information as the target judgment information; The determining, based on the target judgment information and the winding data of the main transformer, the outage status information of the main transformer includes: In a case where the target judgment information is the second judgment information, judging whether the active power, reactive power and three-phase current data of the winding of the main transformer are zero; When the active power, reactive power and three-phase current data of the winding of the main transformer are all zero, determining that the outage state information of the main transformer is that the main transformer is in an outage state; When the active power, reactive power and three-phase current data of the winding of the main transformer are not all zero, the outage status information of the main transformer is determined according to the voltage data of the busbar in the main transformer and the switch status information of the main transformer.

5. The method according to claim 1, characterized in that The determining the voltage loss state information of the busbar according to the voltage data of the busbar and a preset voltage threshold comprises: Obtaining the three-phase voltage value of the bus from the voltage data of the bus; When the three-phase voltage values of the bus are all less than the preset voltage threshold, determining the busbar undervoltage state information as the busbar being in an undervoltage state; When any phase voltage value of the bus is greater than or equal to the preset voltage threshold, the voltage loss state information of the bus is determined to be that the bus is in a partially energized state.

6. The method according to any one of claims 1 to 5, characterized in that Determining the whole substation pressure loss status information of the substation according to the pressure loss status information of the busbar includes: Determining whether all buses in the substation are in a depressurized state according to the depressurized state information of the busbar; When all buses in the substation are in a depressurized state, determining the substation-wide depressurized state information as the substation being in a depressurized state; In a case where any busbar in the substation is in a partially energized state, the whole-station-depressurization state information of the substation is determined to indicate that the substation is not in a whole-station-depressurization state.

7. A state monitoring device for a power system, characterized in that: The device comprises: A data acquisition module is used to acquire real-time monitoring data of the power system; the real-time monitoring data includes voltage data of the busbar in the substation, winding data of the main transformer and electrical parameter data of the transmission line; A first determining module is configured to determine voltage loss status information of the bus according to voltage data of the bus and a preset voltage threshold; a second determining module, configured to determine the overall substation undervoltage status information of the substation according to the undervoltage status information of the busbar, and determine the outage status information of the main transformer according to the winding data of the main transformer and the judgment information corresponding to the voltage level of the main transformer; a third determining module, configured to determine energized state information of the transmission line based on electrical parameter data of the transmission line, topological connection data of the transmission line, voltage loss state information of the busbar, and outage state information of the main transformer; the topological connection data indicating a connection relationship between the transmission line and equipment within the substation; The result generation module is used to generate the status monitoring result of the power system according to the voltage loss status information of the busbar, the voltage loss status information of the entire substation, the outage status information of the main transformer and the energized status information of the transmission line.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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