601 results about "Distribution power system" patented technology

The invention relates to the technical field of tunnel power supply and distribution, in particular to a tunnel modular prefabricated cabin power supply and distribution intelligent substation self-adaptive regulation and control system based on edge calculation. Comprising an edge calculation and AI decision-making unit which is used for realizing rapid acquisition, processing and instant decision-making of tunnel power supply and distribution multi-dimensional data, generating a power supply and distribution adaptive regulation and control strategy by deploying calculation resources and a machine learning algorithm at edge nodes close to a data source, and converting the strategy into an executable regulation and control instruction; a cloud platform collaborative management unit; and an intelligent sensing and internet-of-things unit. According to the invention, hierarchical decision control of the tunnel power supply and distribution system is realized by constructing a hybrid architecture of edge computing and cloud platform collaboration and a priority judgment mechanism; according to the invention, multi-modal data are integrated through the multi-protocol communication link module and the full-scene data fusion analysis module, and data association analysis is realized through Kalman filtering, D-S evidence theory and other algorithms.

The invention provides a network security multi-mode intelligent detection system and method, relates to the technical field of network security management, and is applied to a power distribution system which comprises a communication device and a power distribution device. The network security multi-modal intelligent detection system comprises a multi-modal data acquisition module used for acquiring network flow data, equipment characteristic data and behavior data of a power distribution system; the detection engine module is used for analyzing and detecting the network flow data, the equipment characteristic data and the behavior data to obtain a detection result; and the decision and response module is used for performing risk assessment according to the detection result based on a preset risk assessment model to obtain a risk grading result and a response strategy. According to the invention, comprehensive monitoring and deep analysis of the network security condition of the power distribution system are realized. By integrating multi-modal data, the limitation of a traditional single data detection mode is effectively overcome, and the accuracy and timeliness of threat detection are improved.

The utility model belongs to the technical field of medium-voltage power distribution systems, and discloses an isolating switch device and a switch cabinet, the isolating switch device comprises an insulating rod, a conductive block, a conductive sheet and an operating mechanism, the conductive block is sleeved on the insulating rod, the conductive sheet is fixedly connected with the conductive block, and the operating mechanism drives the conductive sheet and the conductive block to rotate through the insulating rod. Therefore, the conducting strip is selectively connected or disconnected with the circuit breaker connector bar, and the conducting block is electrically connected with the voltage transformer in the rotating process. An isolating switch device is additionally arranged between a circuit breaker and a voltage transformer in a switch cabinet, an operating mechanism is utilized to drive a conducting strip and a conducting block to rotate through an insulating rod, the conducting block and the voltage transformer keep electrical connection in the rotating process, the position of the conducting strip is changed in the rotating process, and then the conducting strip is selectively connected with or disconnected from a circuit breaker connector bar. The structure is simplified, the number of elements is reduced, flexible operation can be achieved, and the stability and reliability of the disconnecting switch device can be guaranteed.

The invention provides a high-voltage power supply and distribution system for an electric vertical take-off and landing aircraft, and belongs to the technical field of power supply and distribution regulation control systems, and the system comprises a main bus bar module which is used for the current collection and distribution of an energy storage battery and a ground DC bus high-voltage power supply, and is provided with a fuse for overload cut-off; the output bus bar module comprises six mutually-independent motor load output channels and two mutually-independent high-voltage output channels, and each motor load output channel supplies power to the two symmetrically-arranged motors at the same time and is used for distributing 12 motor loads and 2 high-voltage output loads; the power-on buffer module is used for power-on buffer of 12 paths of motor loads and restraining power-on impact current; the self-locking control module has a motor load output control self-locking function, and can keep normal output of motor load current under the condition that the monitoring unit fails; and the monitoring unit module is used for monitoring the input voltage, the output voltage and the load current, and performing power-on buffer control and high-voltage contactor self-locking control on the motor load.

The invention discloses a power distribution network power supply recovery method and system considering multi-type distributed power supply cooperation, and the method comprises the steps: enabling a fault section to be successfully isolated, and carrying out the non-voltage switching-on of a network-following type DG in an intertripping power-losing region; constructing a source-load balance island based on the network construction type DG, and preferentially recovering an important load; when there is no contact, the upstream switch of the fault point carries out non-voltage reclosing to process an instantaneous fault, and island grid connection is planned; when connection exists, an optimal connection switch is optimized according to the capacity of a connection line and the capacity of a power-losing load, closing is carried out after an unrecoverable section is cut off, and staged power restoration is achieved by circularly cutting off the unrecoverable load, grid connection of the grid-following type DG and updating the recoverable capacity by considering the capacity of the adjacent grid-following type DG. And when an island adjacent section is recovered, the connected switches are subjected to synchronization grid connection. According to the invention, through a multi-type DG cooperative control strategy, the maximum capacity safety recovery of a non-fault section load is realized, the active support capability of the DG is fully exerted, and the reliability of the power distribution system is remarkably improved.

The invention belongs to the technical field of wireless communication networks, and particularly discloses a LoRa communication system for power distribution network line fault detection and a use method of the LoRa communication system for power distribution network line fault detection. For each node, continuously monitoring changes in voltage, current and temperature monitoring ranges of a line with high voltage acquisition precision and a specific current signal sampling rate, removing noise influence by combining an environmental interference filtering technology, and generating an original monitoring data set according to a preset data acquisition frequency; the data preprocessing module is used for carrying out standardization processing on the collected signals according to the original monitoring data set; the invention aims to solve the problem of logic association caused by mutual fusion of low monitoring precision, high abnormal false alarm rate, unstable data transmission and slow fault isolation response in a traditional power distribution system in the prior art.

The sulfur hexafluoride insulation ring main unit comprises a ring main unit power distribution platform, a ring main unit information base, a ring main unit working condition unit, a power distribution interference unit, a ring network distribution unit, a power regulation and control unit and a power distribution management unit. According to the method, power distribution stability performance analysis is carried out from two points of working characteristics and working parameters of the target ring main unit, and analysis is carried out in combination with the sulfur hexafluoride gas interference degree of the target ring main unit, so that the working stability and continuity of the target ring main unit are improved; ring network distribution working performance risk analysis is carried out on the working condition information of the target ring main unit in an information feedback mode, so that the safety and reliability of the power distribution performance of the target ring main unit are improved, and electric power adjustment demand evaluation analysis is carried out on the electric energy management data. Therefore, the load distribution scheme of the target ring main unit is adjusted according to the information feedback condition, and the reasonable distribution of power resources and the operation efficiency of a power grid are improved.

The invention discloses a high-precision transformer fault detection method and system, relates to the technical field of transformer detection, is used for solving the problems of insensitive fault characterization and delayed diagnosis under a light load condition, and judges whether to enter a load judgment mechanism or not by acquiring input side access voltage information and counting low-load accumulated duration. When entering a load discrimination mechanism, detecting the start-stop behavior of a load branch and the temperature rise trend of a winding, calculating a light load index, identifying a light load state, carrying out region division on an iron core, collecting magnetic flux density data, and calculating iron loss balance characteristics aiming at iron loss deviation which is easy to occur under a light load condition; the insulation degradation coefficient is calculated by fusing the oil temperature peak value and the dielectric loss factor, and the abnormal index is generated with the iron loss balance characteristic, so that the early warning of the early hidden fault of the transformer can be realized in a light load scene in which the traditional temperature rise and current indexes are insensitive, and the operation reliability and maintenance efficiency of the transformer in a power distribution system are improved.

The invention discloses a short-circuit current limiting and short-circuit recovery transient voltage control device and method for an aviation three-stage power generation system, and the device comprises a three-stage power generator, a power generator controller, a current sensor, a voltage and current collection module, and an asymmetric half-bridge excitation control circuit. Collecting the output current iL and voltage UL of the generator through a digital processor of the generator controller; when short circuit occurs, the given voltage USet of the voltage regulating loop is linearly reduced in a piecewise mode according to the relation between the iL and a preset threshold value, so that the generator works in a constant power interval; and when the short circuit is recovered, closing the upper / lower power tubes of the asymmetric half-bridge excitation control circuit according to the relationship between UL and a preset threshold value in a grading manner, and triggering a negative-pressure follow-current mode of a main excitation winding of the generator controller to quickly extinguish the field. The method can adapt to different generators without adjusting hardware circuit parameters, has no motor ablation risk during short circuit, has transient voltage less than 350V after short circuit recovery, has no power supply interruption in the whole process, has response delay less than 1ms, and greatly improves the safety and robustness of an aviation power supply and distribution system.

The invention provides a high and low voltage power distribution cabinet remote operation and maintenance management and control system based on cloud computing, relates to the field of remote operation and maintenance management, and improves the accuracy and operation and maintenance efficiency of power distribution cabinet fault early warning. The method comprises the following steps: firstly, acquiring sensing data through an edge intelligent sensing module, performing multi-dimensional correlation analysis based on a static safety threshold, identifying an abnormal trend with spatial-temporal correlation, and generating a preliminary early warning; then, a cloud platform prediction decision module drives the digital twin model to carry out dynamic simulation, and a predictive maintenance strategy and a dynamic safety threshold are generated in combination with a prediction algorithm of a historical performance decline curve; and finally, the adaptive control execution module optimizes subsequent analysis by using a dynamic threshold value, and triggers a differential control action from monitoring adjustment to emergency isolation according to a strategy type. According to the invention, by constructing the closed-loop intelligent operation and maintenance architecture of cloud-side cooperation, the operation and maintenance mode transformation from passive response to active prediction is realized, and the reliability and safety of the operation of the power distribution system are significantly improved.

The invention belongs to the technical field of ship power distribution, and particularly discloses a double-bus redundant direct-current power distribution system for a ship. Comprising a first direct-current busbar left, a first direct-current busbar right, a second direct-current busbar left, a second direct-current busbar right, a first circuit breaker, a second circuit breaker, a lithium battery pack, a first propulsion inverter cabinet, a first daily inverter cabinet, a second propulsion inverter cabinet, a second daily inverter cabinet, a direct-current voltage stabilizer and a system charging socket box. According to the invention, through setting the first direct-current busbar left, the first direct-current busbar right, the second direct-current busbar left, the second direct-current busbar right and the switching relation thereof, and adopting an operation mode that one group of busbars works and the other group of busbars is standby, flexible and balanced distribution of a power supply and a load is realized, and all loops can work without power failure; once any busbar or branch has a fault, the standby busbar is immediately started so as to start the standby loop, so that no power loss and no power reduction of the whole ship are ensured, and all equipment and components of the whole system are subjected to redundancy design so as to ensure that the power distribution system always supplies power normally.

The invention discloses an unattended power distribution room intensive power distribution system and method based on machine learning, and the method comprises the steps: collecting the operation data of an unattended power distribution room, executing the preprocessing, and generating a standardized input data set; constructing a topology, working condition and equipment feature association relationship to form a three-dimensional coupling feature structure; inputting a hierarchical graph time sequence decision network, and fusing topology and time sequence characteristics to output candidate control actions; constructing a dynamic feasible region according to the joint features, and screening a safety action set meeting constraints; inputting into a topological reversible neural differential control module, predicting transient response and optimizing an execution action; and issuing a control instruction, collecting feedback, and triggering model increment update to realize closed-loop optimization. According to the invention, by introducing a hierarchical graph time sequence decision network and a topological reversible neural differential control mechanism, intelligent intensive scheduling and self-learning closed-loop optimization control of the unattended power distribution room are realized.

The utility model provides a fuse state monitoring circuit and a power distribution system, the fuse state monitoring circuit comprises a fuse connected between a power supply and a load, and the other end of the load is grounded; two ends of the fuse are respectively connected with a first resistor and a second resistor, and the other end of the first resistor and the other end of the second resistor are connected in series with a third resistor to be grounded after being connected; the fuse protection circuit further comprises a voltage sampling circuit which is connected with the voltage sampling end of the third resistor through a sampling channel, and the state of the fuse is monitored according to the sampling voltage of the voltage sampling circuit to the third resistor. According to the invention, state monitoring and voltage monitoring of the fuse are realized by differentiating voltages at two ends of the fuse and connecting the resistors in series, voltage detection of a circuit can be realized, state monitoring of the fuse can also be realized, and the fuse monitoring circuit has the advantages of simple structure and low cost.

The invention discloses a stability evaluation method, system and device of a power system and a medium, and the method comprises the steps: obtaining the load parameters of each node in a power distribution network, and determining the voltage amplitude, first active power and first reactive power of a transformer substation bus based on the load parameters; based on the voltage amplitude, the first active power and the first reactive power, inputting a preset power distribution system model to obtain a first sensitivity matrix, a second sensitivity matrix and a plurality of sensitivity vectors, and based on the first sensitivity matrix, the second sensitivity matrix and each sensitivity vector, obtaining a plurality of sensitivity vectors; the power distribution system model is obtained by coupling a power supply system model and a power distribution network model at a substation bus; and evaluating the stability of the power system based on the power flow distribution. According to the invention, the accuracy and comprehensiveness of stability evaluation of the power system can be improved.

The invention relates to the technical field of low-voltage power supply and distribution systems, and discloses a dual-power-supply quick switching circuit for a low-voltage power supply system, which comprises a main power supply, a standby power supply, a circuit breaker QF1, a circuit breaker QF2, a relay KA1, a relay KA2, an alternating current contactor KM1, an alternating current contactor KM2 and a load, the main power supply is connected with the circuit breaker QF1, one path of the QF1 is connected with the KM1, and the KM1 is connected with the load; the other path is connected with the KA1 from the QF1, the KA1 is connected with the KM2, the KM2 is connected with a coil of the KM1 and then connected with the zero line N, and the 1B phase line and the 1C phase line of the main power supply are further connected with the two ends of the coil of the KA1; the standby power supply is connected with the circuit breaker QF2, one path of the QF2 is connected with the KM2, the KM2 is connected with the load, the other path of the QF2 is connected with the KA2 from the QF2, the KA2 is connected with the KM1, the KM1 is connected with a coil of the KM2 and then connected with the null line N, and the 2A phase line and the 2B phase line of the standby power supply are further connected with the two ends of the coil of the KA2. When the main power supply is abnormal, the standby power supply can be quickly switched to avoid shutdown of the lower-level equipment, the standby power supply can be automatically switched after the lower-level short circuit fault is isolated, and the power supply reliability of the low-voltage power supply and distribution system is greatly improved.

The invention relates to the technical field of power distribution system protection, in particular to a high-safety energy storage system and a fault detection method thereof, the system comprises a measurement and control center, an insulation monitoring device, a bidirectional DC-DC converter and an integrated DC power distribution unit, the insulation monitoring device is connected with a DC power distribution bus, and the ground insulation state of the bus is monitored in real time; the input end of the bidirectional DC-DC converter is connected with the storage battery pack, and the output end is connected with the DC power distribution bus through the integrated DC power distribution unit to construct an electric energy distribution path. The integrated direct current power distribution unit comprises a circuit breaker, two voltage detection modules and two current detection modules, the first voltage detection module is connected with the direct current power distribution bus and the measurement and control center, the second voltage detection module is connected with the circuit breaker and the measurement and control center, and the circuit breaker is connected with the direct current power distribution bus. And the two current detection modules are connected in series between the output end of the bidirectional DC-DC converter and the circuit breaker to form a current detection loop. According to the invention, through multi-level real-time monitoring and centralized control, the safety and fault response capability of the system are significantly improved.

The invention discloses a power distribution network operation parameter optimization identification method based on optimal power flow calculation, and relates to the technical field of power distribution systems, and the method comprises the steps: collecting historical operation parameters of each node of a power distribution network, screening to obtain a data collection priority of an optimal power flow output index, and reasonably distributing node sampling frequencies according to the data collection priority; measuring and collecting operation parameters of the power distribution network according to the distributed sampling frequency, carrying out pre-detection on the collected data, and meanwhile, carrying out adaptive anomaly judgment and sampling frequency dynamic adjustment and carrying out multi-scale decomposition and sensitivity analysis on node residual errors, so as to realize optimal power flow calculation time window adjustment driven by dynamic parameters; and the load model parameters are verified to ensure the accuracy and reliability of the parameter identification result. Through combination of historical data, real-time measurement and residual sensitivity information, transient disturbance, medium-term fluctuation and long-term trend can be considered in the operation parameter identification of the power distribution network, and the online precision of a load model and line parameters is improved.

Embodiments described herein provide for power distribution control systems and methods. The power distribution control systems and methods estimate one or more signal measurements of one or more nodes of a power distribution network using state estimation, identify a location of an outage in the power distribution network, identify a status of one or more switches that form a configuration to restore power to one or more cells of the power distribution network based on the one or more signal measurements estimated using state estimation, and output control signaling to control the one or more switches based on the identified status.

The invention relates to the technical field of power grid monitoring, in particular to a fault monitoring method, system and equipment for a small power generation and distribution system. According to the method, fluctuation characteristics of monitoring signals are analyzed, fluctuation time periods are determined, fluctuation trends are obtained through the lengths of the fluctuation time periods and voltage instability, and short-term fluctuation time periods and long-term fluctuation time periods are obtained through classification. And analyzing each time point one by one, and further screening out a superposed short-term fluctuation time period in the long-term fluctuation time periods through the voltage value difference between the continuous time points. And for the superposed short-term fluctuation time period, the continuation range is adjusted through the fluctuation trend characteristics, and a monitoring signal with accurate characteristic information is obtained. According to the method, the superposed short-term fluctuation time period is effectively extracted, wavelet transform is used for reconstruction, the monitoring signal with accurate feature information is obtained, the power grid monitoring effect can be improved, and subsequent power control over the micro-grid is facilitated.

The invention discloses an auxiliary power supply module and a power distribution terminal, and belongs to the field of electric power supplies. The auxiliary power supply module comprises a charging circuit, an energy storage unit, a power failure detection delay circuit, a booster circuit and a power supply output end; the charging circuit is connected with the energy storage unit and is used for charging the energy storage unit through the main power supply voltage under the condition that the main power supply voltage is normal; the power failure detection delay circuit is respectively connected with the charging circuit and the booster circuit, and is used for outputting a working voltage to the booster circuit when the duration that the main power supply voltage is smaller than a first target voltage reaches a target duration; the energy storage unit is connected with the booster circuit and is used for outputting energy storage voltage to the booster circuit; the booster circuit is connected with the power output end and used for supplying power under the working voltage so as to convert the energy storage voltage into power supply voltage and provide the power supply voltage to the power output end, and the power supply voltage is used for supplying power to the power distribution terminal. The service life of the auxiliary power supply module can be prolonged, and the power supply stability is improved.

The invention discloses a vehicle-mounted high-power power supply and distribution system and method, and the method comprises the steps: enabling one end of an engine to be provided with a transmission wheel train and a high-voltage generator during the running process of a vehicle, and enabling the output rotating speed of the engine to be improved to the rated rotating speed of the high-voltage generator through the transmission wheel train; high-voltage direct current output by the generator drives a high-voltage electric appliance to work after being subjected to voltage stabilization and filtering by the high-voltage distribution box; when an automobile is parked and a mains supply is used, alternating-current mains supply is inverted into direct-current power through the high-voltage distribution box to drive a high-voltage electric appliance to work. The defects that a traditional vehicle cannot run and cannot supply power in a high-power mode under the parking condition can be overcome, especially the technical problem of power supply under the parking condition is solved, software system adaptation development is carried out through the comprehensive technical scheme of a high-power high-voltage silicon generator, mains supply inversion, power supply filtering and the like in combination with post-stage power utilization characteristics, and the power supply efficiency is improved. And stable power supply of the air-conditioning system under running and parking conditions is ensured.

The invention discloses a transmission and distribution system cooperative scheduling method considering decision dependence uncertainty, and relates to the field of power system operation optimization, and the method comprises the steps: 1, respectively building system determinacy optimization scheduling models with the minimum operation cost of a power transmission system and a power distribution system as a target; step 2, in combination with probability information of new energy output and load power of the transmission and distribution systems, obtaining equivalent value probability distribution of transmission and distribution coupling nodes through a convolution algorithm, and constructing a probability distribution set capable of representing boundary coupling variable decision dependence uncertainty between the transmission and distribution systems based on multiple discrete scenes; 3, the probability distribution set rewrites the transmission and distribution system certainty optimization scheduling model into a two-stage distribution robust optimization scheduling model; and step 4, adopting an integrated improved alternating direction multiplier method and a distributed solution algorithm listed in a constraint generation algorithm, and combining a solver Gurobi to realize distributed solution of the robust optimization model, so that the calculation speed is accelerated while the solution optimality is ensured.

The invention discloses a graph reinforcement learning reactive voltage control method considering domain knowledge, and the method comprises the steps: (I) enabling a reactive voltage control problem to be built into a partially observable Markov decision process, and enabling an intelligent agent corresponding to each inverter to only observe the local state quantity of a limited number of nodes around; (2) constructing a space-time diagram in which domain knowledge is embedded; (3) utilizing a graph attention neural network to carry out domain knowledge-based feature reinforcement learning of the multi-agent; and (IV) performing multi-inverter action decision making based on a GAMARL method and the like. According to the invention, by integrating domain knowledge and an advanced graph reinforcement learning technology, the voltage regulation capability of the novel power distribution system under the condition of high-proportion distributed photovoltaic access is remarkably improved, and the intelligent and sustainable development of a power distribution network is promoted.

Y-Δ phase-shifting transformer with 14-times multiple winding output and power supply and distribution system. The high-voltage side winding is connected in Y-shape, and the low-voltage side winding includes at least one sub-winding. Each sub-winding includes 14 three-phase low-voltage phase-shifting windings connected in extended Δ. Each phase coil of the low-voltage phase-shifting winding is composed of a basic coil D1 and an extended coil Y1. The basic coil D1 is used to construct the triangular side of the phase-shifting winding, and the extended coil Y1 is used to construct the triangular extended side of the phase-shifting winding. It is characterized in that the theoretical phase angle distribution of each low-voltage phase-shifting winding of each sub-winding and the turn combination configuration of the basic coil D1 and the extended coil Y1 in each phase coil of windings with different phases are arranged according to the optimized combination data, constructing a Y-Δ phase-shifting transformer with 14-times multiple winding output, which can obtain relatively optimized harmonic elimination effect and relatively balanced output waveform, achieving harmonic elimination quality and standards not only with relative advantages but also with predictability and stability.

An example isolation measurement circuit includes a first switch connecting a first isolation resistor to a terminal of a measurement resistor, the first isolation resistor also connecting to a positive bus of a power distribution system. The isolation measurement circuit also includes a second switch connecting a second isolation resistor to the terminal of the measurement resistor, the second isolation resistor also connecting to a negative bus of the power distribution system. The isolation measurement circuit also includes a pulse generator that connects the measurement resistor to chassis ground.

The invention discloses a vehicle power distribution method, device and equipment based on a centralized domain controller, and a storage medium. The method comprises the following steps: collecting multi-source vehicle power distribution associated data through a centralized domain controller; wherein the centralized domain controller is a vehicle part integrating a whole vehicle control unit, an intelligent power distribution unit, a communication gateway unit and a redundant power supply module into a single shell; performing fusion processing on the multi-source vehicle power distribution associated data to obtain target fusion data; generating a vehicle power distribution control instruction based on a pre-constructed load power supply priority rule, a preset software configuration rule and the target fusion data; and on-off states of a large-current power distribution module and a small-current intelligent power distribution module of the intelligent power distribution unit are controlled based on the vehicle power distribution control instruction so as to realize power supply of each load. The technical effects of improving the integration level and the control precision of the power distribution system and guaranteeing the power supply stability are achieved.

A pre-assembled switchboard has a housing having a plurality of bus bars and a cable entrance for a plurality of sub-circuit cables and a sub-circuit termination block with conductor coupling elements configured for connection to the conductors of a plurality of sub-circuit cables. Circuit protection devices are connected between the bus bars and the sub-circuit termination block, and the conductor coupling elements being grouped by sub-circuit so that the conductors for each sub-circuit cable can be terminated adjacent to each other.

The invention belongs to the technical field of communication power distribution cable fault monitoring, and discloses a cable fault monitoring analysis method based on communication power distribution. According to the invention, when the abnormal condition of the monitored current is analyzed, the voltage fluctuation condition of the external power grid is analyzed, and then the influence analysis of the abnormal condition of the monitored current is carried out, so that the analysis mode improves the accuracy of fault judgment, facilitates more accurate positioning of a fault point, optimizes the fault positioning effect, and improves the fault positioning efficiency. Possible communication power distribution cable fault hidden dangers can be found in time, fault expansion is prevented, and safe and stable operation of a communication power distribution system is guaranteed. According to the method, when the abnormal condition of the monitored communication distribution cable data is analyzed, comprehensive analysis of multi-source combination is carried out from the deformation condition of the communication distribution cable in each abnormal monitoring section and the abnormal condition of the physical data, and the analysis mode can realize accurate diagnosis of the fault of the communication distribution cable.

The invention discloses an SOP and feeder automation cooperative local fault self-healing method and system, relates to the field of distribution line fault self-healing, and can enable a section switch to lose voltage without opening when an interphase short circuit fault occurs in an SOP-containing distribution line, and firstly starts a fault current-limiting control measure to enable the fault to extinguish arc; secondly, a detection signal is injected in a fixed d-axis voltage mode, and permanent fault recognition is carried out; and finally, on the basis of a fault property identification result, constructing an SOP and feeder automation cooperative local fault self-healing scheme. The method can effectively discriminate the fault property and accelerate the power recovery speed, and facilitates the improvement of the power supply reliability of a power distribution system.

The invention relates to the technical field of power supply and distribution monitoring, in particular to a power supply and distribution system performance health state dynamic monitoring system which comprises a state acquisition module, a power supply switching module, a power supply monitoring module, a switching matching module and a state evaluation module. The method comprises the following steps: combining power supply equipment as power supply nodes into a power supply distribution network, and checking switching behavior characteristics of a current power supply node according to operation information of the power supply nodes and operation time and switching times of the power supply nodes; the similarity during switching of different power supply modes is checked according to the voltage deviation and the load deviation of the operation information, and updating of the operation information of each power supply node is completed; starting from switching behavior characteristics, describing a switching mode of a current power supply node under power supply mode switching, describing a switching matching network of each power supply node according to a switching sequence of the switching modes, and finally screening an optimal configuration scheme corresponding to each power supply node; the efficiency of anomaly detection and the reliability of switching of the power supply and distribution system are realized.