234 results about "Line switching" patented technology

The invention provides a global adaptive power supply adjustment method and system under the condition of local load increase, and relates to the technical field of power system dispatching. The method comprises the following steps: acquiring regional power grid topology, equipment parameters and real-time operation data; historical power consumption data of classified users in recent three years are collected and preprocessed; generating a reference load curve based on real-time data and a historical rule, calculating a deviation ratio, predicting a load in future 2 hours, and outputting a risk level; the regional energy storage equipment is called to dynamically adjust the discharge power when the risk is medium or low, and the adjacent regional resources are evaluated and cross-regional line switching and power supply support are executed when the risk is high or the energy storage is insufficient. Through layered adjustment and a dynamic response mechanism, rapid identification and accurate control of sudden load increase are realized, power supply stability and resource utilization efficiency are improved, and the method is suitable for local load fluctuation response of scenes such as residential areas and industrial parks.

The invention discloses an intelligent switching method and an intelligent switching system for double incoming lines of a supply guarantee type micro-grid based on a dynamic threshold value and multi-source cooperation, and relates to the field of intelligent control of micro-grids. In order to solve the defects of unstable switching, large energy storage investment, lagging operation state identification and low synchronous grid-connected efficiency of the existing supply guarantee type double-incoming-line micro-grid, electric energy quality abnormity of an original incoming line branch of the micro-grid is identified, instantaneous disturbance and continuous faults are distinguished, and judgment of an off-grid state is realized. Stable operation regulation of the island is carried out by adopting a multi-source coordination control and load grading optimization management mode; performing wide-frequency-domain electric energy quality analysis and dynamic impedance detection on the standby incoming line, and evaluating grid-connected compatibility and transient response characteristics of the standby incoming line; and in the island steady state, the micro-grid adaptively adjusts the voltage and the phase of the micro-grid side to meet the quasi-synchronization condition, and incoming line switching is realized. The method is mainly used for intelligent switching of the double incoming lines of the supply guarantee type micro-grid.

The invention relates to the technical field of electric power data monitoring, in particular to a fault diagnosis system and method based on an electric power dispatching data network, and the method comprises the steps: analyzing the equipment operation state of each network node based on the equipment operation data of each network node in the electric power dispatching data network, mining a fault association rule, and constructing a node fault knowledge base; predicting a high-probability fault node and a fault time period, and determining a node fault degree; constructing a dynamic network topology model of the nodes based on a graph theory, confirming a standby line set, analyzing the power supply stability of standby lines, and generating a line priority list; and switching the fault node into an optimal standby line confirmed by the line priority list, temporarily supplying power, performing real-time monitoring after the standby line is successfully switched, further executing a process of main and standby line switching-standby line no-load detection-resource release, and re-distributing the fault node into the power dispatching data network. And safe and stable operation of a power system is ensured.

The utility model provides a pluggable switching module and a switch cabinet, and relates to the technical field of low-voltage electric appliances. The pluggable switching module comprises an incoming line switching module and an outgoing line switching module which are arranged on a sealing plate of a vertical busbar of the switch cabinet side by side in the vertical direction, the incoming line switching module and the outgoing line switching module each comprise a contact assembly, and the contact assembly of the incoming line switching module is connected with the vertical busbar in a pluggable mode. A contact assembly of the outgoing line switching module is in pluggable connection with an outgoing line copper bar of the switch cabinet; the contact assembly comprises a shell and a plurality of contact sets arranged in the shell side by side, each contact set comprises one or more bridge-type contacts, and when the number of the bridge-type contacts is multiple, the multiple bridge-type contacts are arranged in a stacked mode. According to the pluggable switching module, the upper wire inlet and the lower wire outlet are achieved, the size of a cabinet body is reduced, the heights of the bridge-type contacts corresponding to all phases in the contact assemblies in the cabinet body are consistent, when large current and small current need to be switched, only the number of the bridge-type contacts needs to be increased or decreased according to the magnitude of the current, and the modification efficiency is improved.

The invention relates to the technical field of artificial intelligence, in particular to a power supply line control method and device of a power system, equipment, a medium and a program, and the method comprises the steps: obtaining operation state parameters of a main power supply line in the power system; determining a fault type and a fault position of the main supply line according to the operation state parameters; if the fault type is a first type of fault, screening an optimal standby line associated with the main power supply line, and executing a corresponding power supply switching action according to the optimal standby line and the fault position; and if the fault type is a second type of fault, executing a corresponding target operation according to the recovery state of the main power supply line within the delay protection duration. Therefore, the problems that in the related technology, the standby circuit switching technology mostly depends on fixed voltage / current detection logic, or simple interlocking judgment is achieved through a programmable logic controller, the risks of misoperation, operation refusal and the like exist, the multivariable combination situation is difficult to process, and the power supply safety margin cannot be dynamically evaluated are solved.

The invention discloses a power distribution network fault data preprocessing method and system based on multi-source information fusion, and relates to the technical field of power systems, and the method comprises the steps: constructing a dynamic topology manifold based on the physical connection relation of power distribution network equipment and multi-source data; manifold deformation caused by line switching or sudden load change is responded, and abnormal data are recognized in combination with the manifold curvature and the equipment connection path distance; encoding the abnormal data, the meteorological data and the equipment state data into quantum states, and generating entanglement feature vectors through quantum gate operation; performing chaos sequence modulation on the basic features to generate modulation features; performing quantum fusion transformation on the modulation feature and the entanglement feature vector to generate an enhanced feature; calculating topological space correlation, chaos behavior similarity and quantum correlation based on the enhanced features, and constructing a multi-dimensional fusion weight; and performing weighted fusion on the enhanced features according to the multi-dimensional fusion weight, and outputting a preprocessed fault feature vector.

The utility model provides a coaxial terminal plug, a signal acquisition circuit and a live-line switching electric energy meter practical training device, the coaxial terminal plug comprises a first coaxial wire core, a second coaxial wire core, a plug connector and a connecting piece, the middle part of the connecting piece is an insulating section, and the upper part and the lower part of the connecting piece are conductive sections; one end of the first coaxial cable core and one end of the second coaxial cable core extend out of the plug connector; the other end of the first coaxial cable core extends to the upper portion of the connecting piece, and the other end of the second coaxial cable core extends to the lower portion of the connecting piece. The signal acquisition circuit comprises the coaxial terminal plug, an MCU microprocessor and a state detection circuit, and the MCU microprocessor is connected with the corresponding coaxial terminal plug through the corresponding state detection circuit. The live switching electric energy meter practical training device comprises a virtual load power supply, a combined junction box and a target electric meter, and further comprises the signal acquisition circuit, and the signal acquisition circuit is used for acquiring the wiring state signal of the tail of the electric meter.

The invention belongs to the technical field of electric power system maintenance optimization, and particularly relates to an electric power circuit day-ahead maintenance plan optimization method considering voltage safety and stability, which comprises the following steps of: constructing an electric power circuit day-ahead maintenance optimization mathematical model by taking minimum unit operation cost and electric power circuit maintenance cost as targets; comprising the steps of setting an objective function and constraint conditions thereof; determining a power transmission line model and an admittance matrix, and then modifying the admittance matrix by adopting a branch addition method to obtain a line switching model based on the branch addition method; and performing staged solution on the line switching model, including three stages of generation and reduction of an uncertain scene, a mixed integer linear main problem and a nonlinear sub-problem, outputting a final solution result, and taking the final solution result as an optimal day-ahead maintenance plan of the power line. According to the method, a maintenance scheme with higher feasibility and robustness is formulated through a reasonable solving strategy, and the overall safety and reliability of a power system are improved.

The invention provides a transmission line dynamic switching optimization method and system, and relates to the technical field of data transmission, and the method comprises the steps: collecting the current fluctuation rate, the temperature rise rate and the historical fault frequency of each transmission line, so as to judge the potential fault risk of the corresponding transmission line, and when the comprehensive score is lower than a preset health threshold value, determining the potential fault risk of the corresponding transmission line; acquiring a load difference value between the slope of the power utilization curve in a preset time window and an adjacent time period so as to judge a load change trend of the corresponding transmission line; generating a corresponding line switching scheme based on the load change trend and the potential fault risk; and when the line switching scheme meets a preset operation safety threshold and a power supply continuity condition, executing line switching operation. Through the scheme, quantitative evaluation of the health state of the transmission line is realized, the potential fault risk and the load change trend can be accurately identified, it is ensured that the target line has enough power supply capacity and safety margin after switching, and the problems of incomplete risk evaluation and inaccurate scheme formulation in the transmission line switching process are solved.

The utility model discloses a composite protection intelligent cable for mountain rail transit, which belongs to the technical field of cables and comprises a circular copper conductor, and a conductor semi-conductive shielding layer, an insulating layer, an insulating semi-conductive shielding layer and a semi-conductive water-blocking buffer layer are sequentially arranged outside the circular copper conductor. A metal shielding layer is arranged in the semi-conductive water-blocking buffer layer, and a waterproof layer, an oxygen barrier layer, an armor layer, an alkali-free glass fiber tape wrapping layer, an outer sheath layer and a composite sheath layer are sequentially arranged outside the semi-conductive water-blocking buffer layer; and a temperature measuring and communication optical cable is arranged in the metal shielding layer. The 35kV flame-retardant B1-level composite protection intelligent cable for mountain rail transit has wear-resistant, rat-proof, termite-proof and ultraviolet-proof additional performance, a temperature-sensing detection optical cable is arranged on a metal shielding layer, the whole line is effectively monitored, management of a master console is matched, when the temperature exceeds the set temperature, automatic alarm, power-off protection and line switching are achieved, and the service life of the cable is prolonged. Fire situations such as electrical short circuit are avoided, and safe and reliable operation of rail transit lines is guaranteed.

A multi-stage evaluation electric power system short circuit and open circuit fault diagnosis method comprises the steps that voltage and current sensors and fault recording devices are installed at key nodes such as a main transformer and a distribution line, and three-phase voltage and current waveform data and zero-sequence components are collected in real time and transmitted to a fault diagnosis server; the server firstly performs preliminary judgment and alarm triggering on short circuit, open circuit and one-way grounding / electric leakage faults, then performs discrete wavelet decomposition and multi-scale time-frequency domain feature extraction on acquired waveforms by using a deep fault classification model based on wavelet analysis and neural network fusion, and realizes fine classification of the faults through a multi-layer residual neural network. And finally, establishing a fault diagnosis result self-adaptive evaluation and response mechanism, dynamically adjusting an alarm level and a switching scheme according to a fault type, realizing protection equipment tripping and fault isolation for a short-circuit fault, generating a standby line switching suggestion for an open-circuit fault, and effectively improving the accuracy and coping capacity of power system fault diagnosis.

The container conveying device and conveying line switching device comprises two conveying rails which are arranged in parallel, the height difference is formed between the two ends of each conveying rail, the two ends of each conveying rail are in transition connection through a connecting section, and a conveying gap is formed between the two conveying rails; the flanges protruding out of the necks of the bottle bodies are supported on the conveying track, the bottle bodies are located at the conveying gap, and the bottle bodies are conveyed in a height lowering mode along the track of the conveying track; according to the device, the flanging part of the bottle body is ingeniously utilized, and the conveying inclination angle of the conveying track can be changed at will according to needs, so that the conveyed bottle body does not topple due to the change of the conveying angle (height and linear-to-arc track); according to the bottle body lifting device, only the conveying track with the proper inclination angle and the conveying gap with the proper width need to be selected, the height of the bottle body is effectively reduced, and the production cost is reduced.

The application relates to the technical field of automobile steel plate longitudinal cutting processing equipment, and particularly discloses an inner-outer plate passage line switching processing device, which comprises a base, a plate conveying passage, a plurality of inner plate guide rollers, outer plate guide rollers and a top extension mechanism, the plate conveying passage is arranged on the upper surface of the base, the inner plate guide rollers are rotationally assembled in the conveying passage in parallel at equal intervals along the plate conveying direction and are arranged in parallel with the inner plate guide rollers, and the top extension mechanism is assembled on the side of the output end of the base and has two working states of contraction and extension. The device realizes differential switching of the inner-outer plate plate conveying paths, when the top extension mechanism is contracted, the inner plate is conveyed by relying on the inner plate guide rollers; when the top extension mechanism is extended, the outer plate can be lifted to be separated from the inner plate guide rollers, and the output is completed only by the outer plate guide rollers. The device avoids the outer plate scratch defect caused by the residual impurities in the inner plate processing, eliminates the surface quality hidden danger of the plate, simplifies the inner-outer plate changing process in the production line and guarantees the high-precision surface processing quality of the automobile outer plate.

The invention provides a heat exchanger on-line switching system in an acid making process, which relates to the technical field of sulfuric acid preparation and comprises two sets of plate heat exchangers, two sets of differential pressure trigger components, a three-way valve, a valve core component, two sets of check valves and two sets of cooling components, the differential pressure trigger assembly comprises a power connection part and two deflection parts which are located on the outlet sides of the heat exchangers and deflect reversely under pressure, two outlets of the three-way valve are connected with the inlet sides of the two heat exchangers respectively, the valve element assembly comprises a horizontally-moving valve rod and a motor provided with a power receiving part, the valve rod is provided with a locking part, an inlet of the check valve is connected with an outlet of the three-way valve, and the opening and closing part is in linkage with the motor. When the pressure difference of the inlet and the outlet of a certain heat exchanger exceeds the limit and the driver is powered on to drive the valve rod to the first preset position, the corresponding check valve is fully opened, and when the driver is driven to the third preset position, the check valve is fully closed, and meanwhile the motor is powered off. Automatic, rapid and reliable online switching of the plate heat exchanger is achieved by integrating mechanisms such as differential pressure triggering, mechanical transmission and electric control.

The invention relates to monitoring equipment and a monitoring method for a power equipment monitoring scene, and belongs to the technical field of power monitoring. The monitoring equipment for the power equipment monitoring scene comprises a plurality of cross-core shells, insulated copper wires are arranged in the cross-core shells, the ends of the insulated copper wires are fixedly connected with connecting ends, and the two connecting ends are installed on the surfaces of the cross-core shells; the monitoring switching mechanism is arranged among the plurality of core penetrating shells; a dynamic monitoring strategy is implemented on the basis of line load characteristics of different power utilization scenes in a power-on operation state of a power system, and when the system is powered off to switch lines, the monitoring system can automatically and synchronously switch to a monitoring mode of a new line, so that the continuity and integrity of monitoring data in a line switching process are ensured, and the monitoring efficiency is improved. Therefore, the full-period monitoring effectiveness of the power line is guaranteed, and the monitoring effect of the power line is guaranteed.

The invention provides an all-optical line switching system based on an optical switch network, and the system comprises an optical switch which is provided with a plurality of optical switch communication modules. An optical line switching matrix is arranged in the optical switch, and the optical line switching matrix comprises a plurality of optical ports; each optical switch communication module is connected with an optical switch communication module of another optical switch or an external switching node communication module, and optical signals transmitted by the optical switch communication module and the optical switch communication module or the switching node communication module of another optical switch are communication light containing data optical signals and management optical signals. The communication light is formed by low-frequency modulation and superposition of a management light signal to a data light signal and / or formed by the management light signal and the data light signal in a wavelength division multiplexing mode; and after receiving the communication light, the optical switch communication module separates the data optical signal from the management optical signal, and transmits the data optical signal to the corresponding optical port. According to the invention, data optical signals and management optical signals can be transmitted simultaneously.

The present invention relates to an intelligent POE power supply and its implementation method, including a control module, a powered device identification module, a line switching module, a voltage output module, an analog detection module, and a wireless communication module; by applying the circuit of the present application, on the basis of standard powered device detection, a corresponding module for identifying the power of the powered device based on the voltage change curve or current change curve is added, enabling the POE power supply to be applicable to most non-standard powered devices with interfaces and power connection sequences consistent with those of standard powered devices but only different in operating voltage, greatly improving the applicability of the POE power supply. Moreover, for some new non-standard devices, compatibility can be quickly achieved by updating the data in the external host database.

The application discloses a communication base station power supply voltage control energy-saving system and method based on communication load. The system comprises a cloud platform, an energy storage battery, a line switching unit, a voltage control unit, and a commercial power grid. The commercial power grid supplies power to the energy storage battery and an antenna in the communication base station through the voltage control unit, and the energy storage battery supplies power to the antenna through the voltage control unit. The line switching unit is used for controlling the on-off of the line. The cloud platform is in communication connection with a control system in the communication base station, and the control system in the communication base station is in control connection with the line switching unit and the voltage control unit. In the method, the cloud platform obtains communication base station load data and antenna load typical power data through the control system, calculates the data and transmits the calculation results to the control system, and the control system controls the line switching unit and the voltage control unit to work based on the calculation results. The application can realize low-carbon energy-saving operation of the communication base station and reduce the operation cost.

This invention discloses an intelligent control method for industrial park power load, relating to the field of energy utilization technology. Addressing the problem of inability to intelligently control industrial park power load, this solution includes a server, power line control equipment, power quality monitoring equipment, and power line load monitoring equipment. The server uses current and historical external power quality data to perform weighted prediction of power quality trends for subsequent time periods and controls external power lines. The power line control equipment receives real-time switching control commands for external power lines from the server. The power quality monitoring equipment collects and sends multi-dimensional quality data from both external and internal power lines to the server in real time. The power line load monitoring equipment sends internal power line load data to the server in real time. The advantage lies in intelligently controlling the industrial park's power load through pre-allocated lines, dynamic line control, load balancing, and pre-generated production plans, thereby reducing production risks.

The utility model relates to the technical field of power supply and distribution, in particular to a toll station power supply line automatic switching circuit with an alarm device. The device mainly comprises a power supply end and a load end, and is characterized in that the power supply end comprises a main power supply end and an auxiliary power supply end; the automatic switching circuit further comprises a dual-power-supply change-over switch used for changing the connection relation between the main / auxiliary power supply end and the load end. A common switch path of the dual-power change-over switch is connected between the main power supply end and the load end; a standby switch path of the dual-power change-over switch is connected between the auxiliary power supply end and the load end; a plurality of auxiliary power supply ends are arranged; and a plurality of dual-power change-over switches are arranged. According to the automatic switching circuit for the power supply lines, seamless switching can be carried out on a plurality of normal power supply lines, the power-off influence of line switching on electric equipment of an expressway toll station is eliminated, then the smoothness of traffic flow passing is guaranteed, and the situation of traffic flow blockage is avoided.

The embodiment of the invention relates to a redundant voltage stabilization protection control method, a redundant voltage stabilization protection circuit and electrical equipment, and the method comprises the steps: receiving a collected voltage value from a voltage collection module, and enabling the voltage value to be a voltage value at a communication line connection end of a communication module; judging whether the plurality of voltage values continuously collected within a preset time length all exceed a preset normal voltage range or not; if yes, a common contact of the circuit switching module is controlled to be connected with the target voltage stabilizing module from being connected with the initial voltage stabilizing module, and the common contact is connected with the communication line connecting end. According to the embodiment of the invention, when the voltage on the communication line does not meet the requirement due to the fault of the voltage stabilizing module, the other voltage stabilizing module is automatically switched to execute the voltage stabilizing function, so that the equipment does not stop when the fault occurs, the operation stability of the equipment is improved, and meanwhile, the maintenance cost of the equipment is reduced.

The utility model discloses an electric power distribution line switching device, which belongs to the technical field of electrical connection, and comprises a lower switching box and an upper switching box, the middle parts of the inner cavities of the lower switching box and the upper switching box are fixedly sleeved with silica gel insulation clamping blocks, the two silica gel insulation clamping blocks are provided with inner arc-shaped grooves, and the inner arc-shaped grooves are provided with inner arc-shaped grooves. The bottom surface of the upper switching box is attached to the top surface of the lower switching box, and one end of an inner cavity of the lower switching box and one end of an inner cavity of the upper switching box are sleeved with first electric wires. According to the utility model, after the first electric wire and the second electric wire are connected, the lower switching box and the upper switching box are sleeved on the outer side of the joint of the first electric wire and the second electric wire, and the joint of the first electric wire and the second electric wire is extruded and fixed in the inner arc-shaped grooves on the two silica gel insulation clamping blocks; and the clamping hooks on the two sides of the upper transfer box are clamped into the U-shaped clamping seats on the two sides of the lower transfer box, so that the lower transfer box and the upper transfer box are conveniently fixed, and the practicability is good.

The invention provides a robot outbound task processing method and device and a related product, and relates to the technical field of voice communication. According to the method, a call process is decoupled into a user-robot-seat three-section continuous call based on software service: an outbound clue is scheduled by a queue and then is delivered to a telephone exchange platform to call a user according to a command, and the user automatically accesses a robot to complete a preset dialogue after getting through the call; and when the robot judges that the manual service is needed, the robot channel is released immediately, and the directional call to the idle seat is initiated again, so that the bridging call without hardware port limitation is realized. Dynamic creation and destruction of call legs are completed through multi-level software instructions and event awareness, the outbound rate, line switching and seat distribution can be adjusted during operation, and lateral expansion is supported to cope with concurrency surge. In the whole process, efficient processing of the outbound task and intelligent switching to manual calling are realized, and the outbound service processing efficiency and flexibility are improved.

The invention provides a power distribution network recovery method and device for coping with man-in-the-middle attack, and the method comprises the steps: inputting a state parameter of a target power distribution network and a man-in-the-middle attack parameter into a first fault recovery model when the target power distribution network is subjected to the man-in-the-middle attack; based on the state parameter of the target power distribution network, the man-in-the-middle attack parameter, and a target function, a communication network recovery constraint, a physical system recovery constraint, a communication and physical coupling constraint and a man-in-the-middle attack influence constraint of a first fault recovery model, solving to obtain a first fault recovery strategy of the target power distribution network; the first fault recovery strategy comprises a line switching sequence, a load recovery plan and a communication link recovery sequence of the target power distribution network; and based on the first fault recovery strategy of the target power distribution network, recovering the target power distribution network. In this way, the fault recovery strategy is optimized by comprehensively considering the coupling relation between the communication network and the physical system and the man-in-the-middle attack influence, and the fault recovery efficiency of the power distribution network when the power distribution network is subjected to the man-in-the-middle attack can be improved.

The utility model discloses a three-way turnout structure for lifting appliance conveying line switching, which comprises a steel structure frame, a rotatable movable track is arranged on the steel structure frame, a turntable is fixed on the movable track, a stand column is arranged above the turntable, the stand column is vertically connected with the movable track, and the movable track is fixedly connected with the turntable. A first driving air cylinder and a second driving air cylinder are symmetrically arranged on the two sides of the movable rail and are obliquely arranged, telescopic rods of the first driving air cylinder and the second driving air cylinder are connected with the two sides of the rotating disc correspondingly, and a locking air cylinder is arranged in the middle of the upper end of the steel structure frame. According to the three-way turnout structure for lifting appliance conveying line switching, the air cylinder is adopted for controlling the three-way turnout to act, the structure is simple and reliable, the failure rate is low, and the use convenience is greatly improved.

The invention discloses a generator set zero-power-failure transfer device and method, and belongs to the technical field of power distribution networks, the generator set zero-power-failure transfer device comprises a control module and an energy storage power supply, the input end of the control module is connected with the energy storage power supply and a generator set, and the output end of the control module is connected with a power distribution cabinet on the power grid side; the control module comprises a main control unit, a line switching module, an electric energy conversion module and a voltage and current acquisition module, detects the voltage, frequency and phase of the output side and the power grid side of the generator set, and controls the voltage and current output by the energy storage power supply according to a detected signal; and the energy storage power supply is used as a conversion medium to complete load transfer of the generator set and the power grid side under zero power failure. Through the synergistic effect of the control module, the energy storage power supply and the generator set, grid connection and grid disconnection of the generator set are completed by connecting a group of cables, and the problem of power grid impact caused by mismatching of phases, voltages and frequencies is effectively solved.

The invention discloses a contact diagram intelligent management method and system based on power grid topology. The method comprises the steps of obtaining historical electrical quantity data of each node in a power grid topology contact diagram and performing state labeling; counting the proportions of the nodes in different historical switching states, and quantitatively evaluating the influence degree of the proportions on the historical electrical quantity; constructing a switching state data set based on the switching state data set; constructing a line switching detection model based on a decision tree algorithm, and training by using the data set; acquiring real-time electric quantity data of each node, preprocessing and calculating the real-time change rate of the real-time electric quantity data; judging the real-time line switching state of each node according to the real-time change rate on the basis of a preset multi-stage state threshold value; inputting the real-time line switching state into the trained detection model, and evaluating the influence degree of the real-time line switching state on the real-time electric quantity of the node; according to the method, the multi-source collaborative acquisition technology is combined with the multi-level threshold state judgment mechanism and the decision tree model, so that the problems of monitoring blind areas and state sudden change response lag caused by a single data source are effectively solved.

The invention discloses a distributed power supply power distribution network fault detection method, system and device and a medium, and belongs to the technical field of power distribution network fault detection, and the method comprises the steps: collecting a voltage signal, and converting the voltage signal into first two-dimensional time-frequency domain image data through a time-frequency analysis method; performing data enhancement on the data to generate a fault data set; constructing a fault detection model; training a fault detection model by using the fault data set to obtain a pre-trained fault detection model; and converting a voltage signal acquired in real time into second two-dimensional time-frequency domain image data through a time-frequency analysis method, inputting the second two-dimensional time-frequency domain image data into the pre-trained fault detection model, and outputting a fault position prediction result. According to the method, fault detection and positioning can be realized before the insulation fault occurs, the influence of the transient response of the distributed power supply on fault detection is considered, the method can better adapt to the actual operation conditions of the power distribution network, such as distributed power supply access, load, line switching and the like, and the robustness of the method is high.

The application discloses a hybrid MMC control method and system, which comprises the following steps: under the working conditions of voltage reduction / half voltage operation of a converter station, on-line switching of a single valve group and DC fault ride-through, a control pulse is formulated according to a converter voltage reference value formulated by capacitor voltage of a sub-module in an MMC converter valve, an arm current loop injection voltage value formulated by a time-varying value of an arm current loop and a DC voltage given value formulated by a DC current given value, and the hybrid MMC is controlled to be put into operation. According to the converter voltage reference value formulated by the capacitor voltage of the sub-module in the MMC converter valve, the hybrid MMC can ensure that the MMC arm current zero-crossing point is guaranteed, capacitor voltage balance is realized and system collapse caused by separation of capacitor voltage of a full-bridge sub-module and the capacitor voltage of the sub-module is avoided under special working conditions. The time-varying value formulated by the arm current loop of the MMC converter valve obtains an expected value of the arm current loop injection, and the arm current always has a zero-crossing point through an arm current loop injection link, so that the safe operation of the MMC arm is ensured.

1. Name of the Design Product: Video Switcher (T310). 2. Use of the Design Product: This design product is mainly used for video line switching. 3. Design Key Points of the Design Product: Lies in the shape. 4. Picture or Photograph that Best Illustrates the Design Key Points: Perspective view.