45results about How to "Rapid isolation" patented technology

This utility model discloses a tunnel fire-fighting foam liquid filling system, belonging to the field of fire-fighting equipment technology. It includes several fire boxes, a foam liquid filling vehicle, and a monitoring center. Both the fire boxes and the foam liquid filling vehicle are networked with the monitoring center to achieve data exchange. Specifically, each fire box contains a foam liquid storage tank and a first control device. The foam liquid storage tank is equipped with a first liquid level sensor, a solenoid valve, a variable frequency delivery pump, and a first flow meter. A flow regulating valve and a second flow meter are installed on the pressure water pipe. All components are connected to the first control device. The foam liquid filling vehicle contains a foam liquid storage tank, a variable frequency high-pressure pump, a battery, a third flow meter, and a second control device. Both the first and second control devices are connected to the monitoring center. This utility model provides a highly efficient, intelligent, and easy-to-maintain tunnel fire-fighting foam liquid filling system.

The invention relates to the field of modular charging, in particular to a modular charging mechanism for a power pack and a management method thereof, and the modular charging mechanism comprises a power supply placement table which provides placement space for a plurality of groups of power supplies and is arranged in an array manner; the modular mechanism is arranged on the outer side of the power supply placement table, is arranged corresponding to the power supply placement table, and is used for carrying out centralized modular charging on multiple groups of power supplies to realize synchronous or independent power supply; according to the modular charging mechanism for the power pack and the management method of the modular charging mechanism for the power pack, when abnormal high temperature occurs to the power supply, a melt is heated and melted to trigger a linkage mechanism, and a limiting plate is driven to be automatically stored through spring reset and gear transmission, so that the temperature of the power supply is lowered, and the reliability of charging is improved. And the power supply is quickly released from being clamped.

This invention discloses a rapid splicing control method for high-efficiency liquid-cooled energy storage modules, relating to the field of energy storage system technology. It includes five core control steps: pre-configuration before splicing involves reading module identity and parameters via wireless communication, verifying compatibility, and generating a splicing sequence; physical splicing employs visual and mechanical collaborative positioning, dynamically adjusting to ensure precise interface alignment; the liquid-cooled circuit opens the reversing valve in a timed sequence, monitoring pressure and flow to achieve leak-free connectivity; the electrical interface uses adaptive detection to match protocols and voltage, with soft-start to avoid current surges; after splicing, a collaborative algorithm dynamically allocates power and flow, with closed-loop control ensuring stable system operation. This invention significantly improves the splicing efficiency and positioning accuracy of liquid-cooled energy storage modules, possesses fault tolerance and flexible expansion capabilities, adapts to large-scale and distributed energy storage scenarios, and meets the high-efficiency and reliable operation requirements of energy storage systems.

The invention relates to the technical field of intelligent fire fighting, and discloses an unattended indoor fire-fighting robot which is characterized in that the discharge end of one side of a pressurizing box is connected with a fire extinguishing nozzle, the other side of the top of a mounting plate is provided with a monitoring box, and the bottom of the monitoring box is provided with a monitoring instrument for fire monitoring; according to the fire extinguishing device, the limiting winding box is driven by the threaded seat to rotate, winding and unwinding of the traction cable are achieved, the rotating pipe automatically deflects to the horizontal position under the dead weight by unwinding the traction cable, fire extinguishing dry powder is conveyed into the rotating pipe, the fire extinguishing dry powder is evenly distributed to a fire extinguishing area through the distribution holes, and the fire extinguishing effect is improved. The fire extinguishing dry powder is sprayed to the fire extinguishing position in a circumferential distribution mode by combining rotation of the rotating pipe, so that the fire extinguishing dry powder can surround the fire position in a cylinder shape, the use effect of the fire extinguishing dry powder is improved, the actual fire extinguishing isolation area is expanded, the fire area is rapidly isolated, fire spreading is prevented, and loss is reduced.

The invention relates to an offshore wind power and conventional power supply direct current bundling and sending-out system. The invention provides an offshore wind power and conventional power supply direct-current bundling and sending-out system, which aims at solving the problems of existing offshore wind power sending-out, and comprises an offshore wind power flexible direct-current sending-out system, a conventional power supply flexible direct-current sending-out system and a direct-current bundling and sending-out system. The offshore wind power flexible direct current sending-out system comprises an offshore wind power unit group, an alternating current collection submarine cable, an offshore flexible direct current converter station and a direct current sending-out submarine cable. The conventional power supply flexible direct current sending-out system comprises a conventional power supply, an alternating current power transmission line, a land flexible direct current converter station and a direct current power transmission line; the direct-current bundling and sending-out system comprises a direct-current incoming line, a land direct-current pooling station and a direct-current outgoing line. The offshore wind power fluctuation can be stabilized, and the influence of the offshore wind power fluctuation on system stability is reduced; the requirements of various operation modes are met, and direct-current fault isolation and alternating-current fault ride-through are realized; the power transmission cost is saved.

The invention relates to the field of energy storage power station control, and particularly discloses a layered distributed emergency stop control system of an energy storage power station, which comprises a local emergency stop control unit used for executing shutdown control of at least part of equipment in the energy storage power station; the regional emergency stop control unit is associated with all local emergency stop control units in a regional coverage range and is used for executing shutdown control of equipment in the regional coverage range in the energy storage power station; and the station end scram control unit is associated with the all-region scram control unit and is used for executing all-region shutdown control of the energy storage power station through the station end controller when the station end scram button is triggered. According to the technical scheme provided by the invention, through the arrangement of the regionalized distributed layered emergency stop control units, the reliability risk that the existing emergency stop control system is easily influenced by the single-point fault of the central controller is avoided, and the omnibearing precise shutdown control and local isolation protection of the energy storage power station are realized.

This utility model discloses a cooling device for precipitation of phenylhydrazine hydrochloride mother liquor, comprising a refrigeration compressor, an oil separator fixedly connected to the output end of the refrigeration compressor, an evaporative condenser fixedly connected to the main outlet of the oil separator, an auxiliary ammonia storage tank fixedly connected to the outlet of the evaporative condenser via a first pipeline, an ammonia tank fixedly connected to the outlet of the auxiliary ammonia storage tank via a second pipeline, a shut-off valve installed at the connection between the ammonia tank and the second pipeline, and a thin-film evaporator fixedly connected to the outlet of the ammonia tank via a third pipeline. The main outlet of the thin-film evaporator is fixedly connected to a brine tank. Through the above structure, a buffer system is formed by the interlocking of the ammonia tank, the auxiliary ammonia storage tank, and the double shut-off valves, which can quickly isolate the ammonia source in case of emergency shutdown. In addition, the use of a closed-loop system with a low-temperature brine medium can effectively reduce energy consumption, thereby preventing the waste of cooling capacity caused by intermittent production.

This utility model discloses a movable and angle-adjustable partition, comprising: a box body, a lifting partition, and a sliding partition. The top of the box body has two limiting grooves. The outer wall of the lifting partition has two rotating members, and the inner side of each rotating member has a first pulley. The sliding partition has two fixing members on opposite outer walls, and the inner wall of each fixing member has a second pulley. The inner walls of opposite inner walls of the box body have multiple first slots symmetrically arranged, and the inner walls of opposite inner walls of the box body have multiple second slots. One side of the lifting partition has four first sleeves, and the inner wall of each first sleeve has a first pin. One side of the sliding partition has two second sleeves, and the inner wall of each second sleeve has a second pin. Through the free adjustment of the sliding partition and the lifting partition, the internal space of the box can be flexibly adjusted according to the size and quantity of the loaded items, and the storage needs of different types of items can be met.

The application relates to the technical field of photovoltaic power generation, in particular to a control method and device of an energy storage system and electronic equipment. In the embodiment, when it is learned that a battery module is in a fault state, the fault battery module is quickly isolated from a bus, so that the fault is prevented from spreading; then, a power adjustment mode is automatically determined according to a power difference between photovoltaic power and inverter power, and the output power of the photovoltaic module or the inverter module is adjusted correspondingly, so that the photovoltaic power of the photovoltaic module and the inverter power of the inverter module satisfy a preset matching relationship; then, the mode is switched to photovoltaic full-rate grid connection, so that, after the battery module is isolated, the photovoltaic power and the inverter power can be quickly matched and the bus voltage can be stably controlled without relying on a communication link or a large-capacity buffer capacitor, the energy storage system can continuously operate without shutdown during the maintenance of the battery module, and the waste of photovoltaic energy is avoided.

This invention discloses an anti-burning foam fire extinguishing agent for lithium batteries and its preparation method, relating to the field of fire extinguishing agent technology. The anti-burning foam fire extinguishing agent for lithium batteries prepared by this invention mainly comprises a foaming agent system, a foam stabilizer, and a heat-absorbing material. The foaming agent system contains sodium perfluorocrown ether sulfonate, the foam stabilizer is modified silica, and the heat-absorbing material contains modified microcapsules. The anti-burning foam fire extinguishing agent for lithium batteries prepared by this invention exhibits good foam stability and fire extinguishing performance.

This application provides a flight device, comprising: a fuselage; and an energy storage component disposed outside the fuselage, the energy storage component including a connecting mechanism and a battery, the connecting mechanism being mounted on the fuselage; the connecting mechanism having a locked state and an unlocked state, the connecting mechanism being configured to switch between the locked state and the unlocked state, in the locked state the connecting mechanism being connected to the battery, and in the unlocked state the connecting mechanism being disengaged from the battery, thereby detaching the battery from the fuselage. With this configuration, in emergency situations such as battery spontaneous combustion, the connecting mechanism can switch to the unlocked state. Since both the connecting mechanism and the battery are located outside the fuselage, the interior of the fuselage can be effectively isolated from fire sources, while the battery can be quickly jettisoned.

The present application relates to the field of micro-grid control and power electronics, in particular to a micro-grid system and method based on distributed control, comprising a central control module and a plurality of distributed nodes interconnected through a communication network; the distributed nodes collect local bus three-phase voltage, current and extract power quality parameters, transient operating parameters and local communication parameters; switch to a local autonomous control state when the communication delay is greater than 200ms or the packet loss rate is greater than 40%; the central control module generates inertia control table and specific harmonic compensation instructions and issues; when the active power change rate exceeds the threshold value, the local table lookup interpolation obtains the target virtual inertia, generates the voltage phase reference value to adjust the distributed inverter output power; when the total harmonic distortion rate or the negative sequence current is out of limit, the nonlinear load branch is cut off; and the next period inertia control table is updated through frequency calibration.

This invention relates to the field of home kitchen technology and discloses a modular energy storage battery device with multi-dimensional safety protection. The device includes a cabinet, a multi-dimensional safety protection system, a multi-parameter all-domain intelligent monitoring unit, and a hierarchical linkage monitoring and control system. The cabinet is the basic unit of the energy storage device, realizing energy storage and release through core components such as battery modules, a battery management system (BMS), and a thermal management system. One end and one side of the cabinet are rotatably connected to cabinet doors. By adopting a standardized pull-out battery module compartment structure, coupled with handles, guide rails, and quick-connect liquid cooling and electrical interfaces, a single module compartment can be quickly disassembled and assembled without tools, significantly shortening module replacement time and solving the problem of traditional devices requiring complete cabinet shutdown for repair of faulty modules. Simultaneously, the standardized cabinet architecture supports parallel expansion of multiple cabinets, allowing for flexible capacity adjustment according to energy storage needs. This significantly improves adaptability and expansion flexibility, greatly reducing the manpower and time costs of on-site installation and subsequent maintenance.

This invention relates to the field of explosion-proof sensor technology and discloses a resin-encapsulated explosion-proof sensor. The sensor comprises: a cavity formed by combining the gas collecting hood cover and the gas collecting hood base; a gas-sensitive detection component, an expansion isolation component, and a secondary fast-sealing component sequentially installed from top to bottom within the cavity; the gas-sensitive detection component for real-time detection of hydrogen content in the air; and the expansion isolation component, through rapid filling with expansion material, achieving rapid gas isolation within the cavity via physical properties, thus providing a safe early warning effect. When the hydrogen concentration within the sensor's gas collecting hood exceeds the standard, the expansion material in the liquid bladder is triggered and rapidly expands. Because the liquid bladder is installed in a specific position, the expanded material quickly fills the surrounding space, separating the gas-sensitive detection cavity from the hydrogen and preventing further hydrogen diffusion, thereby achieving the function of rapid gas isolation and providing a safe early warning effect.

The embodiment of the application provides a kind of service system optimization method, this method involves distributed system resource management and optimization technical field, this method includes: obtaining the resource data and log data of the consumption service of message middleware system and container cluster system;Extract hardware features and running features from resource data, extract log keyword features and time correlation features from log data, extract downstream features and business features from consumption service data;According to hardware features, running features, downstream features and business features, calculate the consumption service of container cluster system Abnormal score, determine the consumption service abnormal reason type in combination with the above parameters and abnormal score, log keyword features and time correlation features;Obtain resource configuration features, load features and business target features, optimize business system in combination with abnormal reason type.Thereby, the problems such as one-sidedness of monitoring system in related art, dependence on manual for abnormal positioning are solved.

The invention relates to the technical field of power system high-voltage switchgear control. The invention provides a GIS high-voltage circuit breaker emergency opening method and system based on three-phase linkage. The method comprises the following steps: collecting a direct-current control power supply state and a three-phase circuit breaker operation state signal, and judging a direct-current control power supply power loss and electrical opening failure fault through a fault recognition model; generating a three-phase cooperative opening instruction containing a synchronous time sequence and a power parameter based on a judgment result; the instruction is synchronously issued to an execution device, and the three-phase moving contact is driven to be synchronously opened; and a contact position signal after opening is collected for verification, and if the preset state is not reached, parameters are adjusted for re-driving until opening is completed and a signal is output. The problems that when a direct-current control power supply loses power, an existing GIS high-voltage circuit breaker depends on a single-phase independently-operated manual emergency opening device, so that opening is different, operation is tedious, and the emergency efficiency is low are solved.

This utility model discloses an antibacterial hose cap, including a main support cap. A sealing sleeve is abutted to the bottom of the main support cap, and an isolation plate is fixedly installed on the inner side of the sealing sleeve. A through groove is formed on the bottom surface of the isolation plate, and a movable top groove is formed on the top of the main support cap. The sealing sleeve is fitted onto the outer side of the hose, and the isolation plate further isolates and seals the outer side of the hose, further enhancing the sealing effect. This allows for the separation of the sealing top block from the hose, making operation simple and convenient. No complicated tools or tedious disassembly steps are required; ordinary users can easily replace the sealing top block, saving time and effort. Pressing the top block and the inner top block automatically resets, and the new sealing top block quickly and tightly engages with the top opening of the hose, achieving rapid sealing and reducing the hose's exposure time during sealing top block replacement, thus reducing the risk of leakage and contamination.

The invention provides an energy scheduling and MPPT (Maximum Power Point Tracking) control system and method suitable for multi-path photovoltaic. The system comprises a plurality of photovoltaic panels, a photovoltaic conversion module, a battery bus, a battery management module and a main control module, wherein the main control module integrates a sampling unit, an energy scheduling unit, an MPPT control unit and a comparator. The sampling unit obtains voltages and currents of all paths of photovoltaic and battery buses, the energy dispatching unit distributes reference power under the constraint of target charging power, the MPPT control unit drives all photovoltaic conversion modules to track the maximum power point under the constraint of the reference power, and the comparator compares a sampling electrical parameter with a safety threshold value. And the corresponding photovoltaic conversion module is turned off through the independent hardware access during overrun. According to the scheme, matching of multi-path photovoltaic power and battery requirements is achieved, the photovoltaic energy utilization rate is improved, fluctuation of a battery bus is reduced, and the fault response speed and the system safety are improved.

The invention discloses a simulation method and device for plasma field distribution in a vacuum arc-extinguishing chamber. The simulation method comprises the following steps: establishing a three-dimensional simulation model of the vacuum arc-extinguishing chamber in a pole-mounted circuit breaker; the method comprises the following steps: importing a three-dimensional simulation model of a vacuum arc extinguish chamber in a pole-mounted circuit breaker into COMSOL Multiphysics software, and setting a plasma mass conservation equation, a momentum equation, a cathode magnetic field boundary condition function and an anode magnetic field boundary condition function in combination with an MUMPS solver; in COMSOL Multiphysics software, initial calculation conditions are set, the rotating angular speed of a moving contact and an arc current value serve as input variables, multi-physics field coupling is achieved, and simulation of plasma field distribution in a vacuum arc extinguishing chamber in a pole-mounted circuit breaker is completed. By establishing a multi-physics-field coupled vacuum arc extinguish chamber inner plasma field calculation model, the spatio-temporal evolution law of plasmas under the action of a strong electric field and a magnetic field is accurately represented, and a theoretical basis is provided for optimizing the arc extinguish chamber structure design, restraining breaking overvoltage and preventing restrike.

The invention discloses a fault diagnosis system and method for an automatic power distribution network, and relates to the technical field of power distribution network diagnosis, and the method comprises the steps: collecting electrical data, and calculating a bus zero-sequence voltage difference component and a feeder zero-sequence current; generating an event window based on the voltage difference component features; a residual zero-sequence current is obtained by fitting and stripping the capacitance component in the window; calculating a comprehensive score based on the ratio of the residual energy to the original energy so as to determine a fault feeder line; and further determining a fault section according to the score difference of adjacent measuring points along the fault feeder line. According to the invention, by stripping the capacitance response component, the problem of misjudgment caused by a first peak inversion phenomenon is effectively solved, and the accuracy of fault diagnosis is improved.

The utility model relates to the technical field of solar cells, and particularly discloses roller mark detection equipment, which comprises a base frame provided with a detection area used for placing a silicon wafer to be detected; the first light source is mounted on the base frame, and the first light source is used for irradiating the silicon wafer so as to polish the surface of the silicon wafer; the rotating mechanism is mounted on the base frame; and the detection mechanism comprises a camera and a second light source arranged on the periphery of the camera, the camera is connected with the rotating mechanism, the camera is used for rotating around the side edge of the silicon wafer under the driving of the rotating mechanism, the camera is used for acquiring image information of the silicon wafer, and the second light source is used for emitting light to the direction of the silicon wafer. According to the utility model, the roller mark can be detected in advance in the solar cell preparation process, so that the problem of solar cell finished product abnormity caused by the roller mark can be timely fed back and processed.

The application provides a bipolar direct current system valve side ground fault isolation method and device, and relates to the technical field of high-voltage direct current transmission fault processing. The bipolar direct current system comprises a first direct current pole, a second direct current pole, a grounding unit and two groups of alternating current circuit breakers. The method comprises the following steps: when a ground fault occurs at the valve side of the bipolar direct current system converter transformer, differential protection is started for the valve side area until the alternating current system is isolated from the fault point; the fault pole converter valve is blocked, the first alternating current circuit breaker of the fault pole is controlled to be disconnected, and after a delay preset time length, the second alternating current circuit breaker of the fault pole is controlled to be disconnected, so as to isolate the alternating current system from the fault point; when the direct current is less than a preset direct current threshold, the first switch and the second switch are controlled to be disconnected, so as to complete the isolation of the direct current system from the fault point. The application can delay the tripping of the two alternating current circuit breakers, does not need to judge the fault phase and whether the alternating current phase current appears a zero point, and can quickly act to complete the isolation of the valve side ground fault.

The application relates to the technical field of waste heat recovery of pneumatic ash conveying systems, and discloses an energy-saving control device for a power plant pneumatic ash conveying system. In the application, the device housing is provided with a motor bin on the upper surface, a bottom fixing ring is fixedly installed on the upper surface of the device housing, a gas conveying pipe is arranged in the bottom fixing ring, a circular baffle is rotatably arranged in the bottom fixing ring, a rotating rod is welded to one end of the circular baffle, and a motor is fixedly connected to the rear end of the rotating rod. In the power plant pneumatic ash conveying system, the intermittent airflow of the gas conveying pipe, i.e. periodic start-stop or airflow adjustment, can optimize the system performance and bring multiple economic benefits and technical advantages, effectively reduce local wear and tear, avoid long-term high-pressure impact on the pipeline, reduce the probability of weld cracking, avoid pipeline blockage or imbalance of ash-gas ratio caused by overload, reduce invalid airflow emission through intermittent conveying, reduce the load of the end dust removal equipment, and thus reduce the risk of dust escape.

The invention relates to the technical field of power equipment fault positioning, in particular to a power equipment fault positioning method based on a graph neural network, which comprises the following steps of: establishing a Chain-GNN model to be matched with hardware deployment to pre-process data during normal operation of a circuit, and determining normal operation baseline data; step 2, setting an abnormal score threshold and a bidirectional traveling wave fault rule base, and oppositely and synchronously injecting bidirectional traveling waves into a preliminarily alarmed line, and step 4, after a fault point is confirmed, ensuring normal operation of other equipment; after the sublines are erected, first-aid repair is carried out, and after first-aid repair is completed, all the sublines are disconnected, and original circuit connection is recovered; comparing the normal operation baseline data in the step 1 to determine whether the line recovers normal operation, if so, entering a step 6, and if not, returning to the step 3 to re-determine the fault point; and the Chain-GNN model can automatically archive the whole process data of the fault processing at this time.

The utility model relates to ladle technical field, concretely is a kind of safety system of ladle tilting device. Including energy storage system, O type electromagnetic reversing valve, balance valve, hydraulic cylinder, first unloading oil circuit and second unloading oil circuit;The energy storage system is connected with oil tank pipeline, and energy storage system, O type electromagnetic reversing valve are connected with balance valve pipeline;The balance valve is directly integrated in hydraulic cylinder oil port or connected with hydraulic cylinder pipeline;First unloading oil circuit one end is connected with the hydraulic cylinder rodless cavity oil port, and the other end is connected with main oil return pipeline;Second unloading oil circuit one end is connected with the hydraulic cylinder rod cavity oil port, and the other end is connected with main oil return pipeline. Solve the major safety hazard, such as ladle accidental tilting, molten steel pouring interruption or falling, caused by hydraulic system failure, electrical fault or sudden power failure in the prior art, ensure the continuity and safety of steel smelting process.

This utility model discloses a power-assisted tilting machine, which includes a carrier module, a conveying module, a lifting and positioning module, and a lifting module. The carrier module is located on the conveying module, and the conveying module is used to transport the carrier module. The lifting and positioning module is located below the conveying module. The lifting module is located above the lifting and positioning module. The lifting module includes a lifting drive mechanism, a lifting slide, a gripper cylinder, and gripping components. The lifting drive mechanism is connected to the lifting slide. The lifting slide is connected to a support frame. The gripper cylinder is located on the support frame, and its two output ends are respectively connected to the gripping components. The two gripping components are arranged opposite each other, and each of the two gripping components has a rotating pin on its opposite side for engaging with gripping holes on the workpiece. The technical solution of this utility model is simple to operate and highly safe. The system is stable and reliable, easy to maintain, and reduces labor costs.

This invention discloses a high-pressure-resistant power battery protective shell based on a multi-dimensional honeycomb structure, relating to the field of power battery protection technology. It includes an upper protective cover, with side plates fixedly connected to both ends of the upper protective cover via fixing mechanisms. The two side plates are arranged opposite each other and enclose a cell-accommodating cavity. A honeycomb pressure-resistant mechanism is provided on the side of the upper protective cover facing the cell-accommodating cavity. At least two sets of symmetrically distributed lifting mechanisms are provided on the outer sides of both side plates. The multi-dimensional gradient composite honeycomb structure achieves high pressure and impact resistance protection, while also possessing flame-retardant, heat-absorbing, and heat-dissipating properties. This solves the problems of insufficient pressure resistance, single protective function, and poor installation adaptability of traditional power battery protective shells, significantly improving the safety and stability of power battery use.

The invention discloses a closed-loop distribution line single-phase grounding protection method, system and device and a medium, and belongs to the technical field of power system operation and maintenance, and the method comprises the steps: collecting a zero-sequence voltage and a zero-sequence current, and judging whether a line fault exists or not; acquiring three-phase voltage data and three-phase current data in a first time window after detecting that a line fault exists, and extracting a zero-sequence voltage transient component and a zero-sequence current transient component; calculating a zero-sequence voltage phasor and a zero-sequence current phasor through frequency domain transformation; determining a phase difference between the zero-sequence voltage and the zero-sequence current, and judging a fault direction; and controlling to send a control signal to the opposite-end protection device according to the fault direction. On the premise of not depending on the power frequency steady state quantity, the fault direction is rapidly and accurately recognized, accurate positioning and isolation of a fault section are achieved through a double-end cooperation mechanism, and therefore the problems that single-phase grounding protection of a net structure is low in sensitivity and poor in selectivity are solved.

The application relates to an active power distribution network fault positioning system based on passive protection and a method thereof, the system comprising passive protection terminals installed in switch cabinets and looped network cabinets of an active power distribution network, uPMUs installed in distributed power source access points and voltage busbars of a power distribution network system, the passive protection terminals and the uPMUs being connected with a fault positioning host computer, and the fault positioning host computer being connected with a power distribution network dispatching automation system. The method comprises the following steps: according to a distributed power source grid-connected inverter control strategy, a controlled current source model is established, and a distributed power source grid-connected point impedance branch model is obtained; an active power distribution network sequence component calculation network is established to calculate branch currents of power distribution network feeder lines; passive protection terminals collect current of the power distribution network feeder lines, uPMU synchronous measurement terminals collect voltage measurement data, and the data are transmitted to the fault positioning host computer for matching to search for a fault point position and isolate a fault section. Compared with the prior art, the application can accurately perform fault positioning and improve power distribution network power supply reliability.