227 results about "Distribution power system" patented technology

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 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.

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.

The invention relates to the technical field of power electronics, and particularly provides a double-rectification single-inversion redundant uninterruptible power supply system and a control protection method thereof, and the system comprises a power distribution system, a variable current power module and a control protection system. The power distribution system has double AC inputs, a common DC bus and AC outputs. The converter module comprises three converters, two of which serve as rectifiers and are connected in parallel with the direct current bus, and the other one serves as inverter output. The control method comprises the following steps: in a double-path load balancing mode, realizing power equalization through composite voltage control; in a single-path operation mode, fault seamless switching is realized based on load feedforward and adaptive slope control; in a power distribution mode, triggering according to capacity margin and cooperatively adjusting a droop coefficient based on an optimization target to realize power redistribution; and complete real-time fault protection logic is realized. According to the invention, uninterruptible power supply with high reliability and high electric energy quality is realized, and active regulation and control of power are realized.

The invention discloses a control method and system for an all-in-one intelligent connection distributed power supply acquisition safety terminal, and relates to the technical field of power distribution network intelligent control. A power distribution network line topological structure is converted into a graph structure, and a topological graph structure is obtained; identifying a key time node in the historical operation data, and calculating a time sequence attention weight to weight the historical voltage sequence to obtain weighted historical data; inputting a topological graph structure and the weighted historical data into a graph neural network for feature aggregation to obtain a node embedding representation; identifying a target line according to the comprehensive risk value, and constructing a multi-target optimization function solution based on the node embedding representation to obtain an initial access capacity scheme; and substituting the initial access capacity scheme into the digital twinborn model for simulation, calculating an anti-risk coefficient, and performing correction in combination with a load threshold and a reverse power threshold to obtain an optimal access capacity scheme. And the accuracy of distributed power supply access capacity evaluation and the bearing capacity optimization level of a power distribution system are remarkably improved.

The invention belongs to the technical field of power supply and distribution systems, and discloses a direct current power supply and distribution system and method of a nuclear power station facing a computing power data center, and the system comprises a direct current power supply and distribution architecture of a main power supply system, a medium-voltage direct current system and a low-voltage direct current system. Alternating current of a main power supply system is converted into medium-voltage direct current to be supplied to a medium-voltage direct current system through a first voltage conversion module, then the medium-voltage direct current is converted into low-voltage direct current to be supplied to a low-voltage direct current system through a second voltage conversion module, and the medium-voltage direct current system directly supplies power to a low-voltage system when a main power supply fails. And when the main power supply and the medium-voltage system both fail, the low-voltage system operates independently to meet the load requirement. By adopting the system, the equipment investment and the operation cost are obviously reduced, the electric energy transmission efficiency and the power supply reliability are improved, the potential safety hazard is eliminated, and the efficient cooperative power supply of the station power of the nuclear power station and the load of the data center is realized.

The invention discloses a ground station multipath load intelligent power distribution system and a power distribution method. The system comprises a power supply module, a Hall voltage sensor, a single-chip microcomputer, an AD acquisition module, an input / output relay, a Hall current sensor and a master control module. Data receiving, transmitting, analyzing, storing and updating of input voltage and load current are achieved through the input measurement and control module and the load measurement and control module. Through acquisition and judgment of the main control module, the functions of input / load multichannel on-off execution, fault reporting of open phase, overvoltage, undervoltage and the like are realized, and an intelligent power distribution strategy is generated. By using the design method provided by the invention, the design cost can be effectively reduced; the load can be automatically distributed to a three-phase power supply; the method can achieve the quick and simultaneous power-on and power-off of multiple loads in a short time, can record a load curve, updates a power distribution strategy in time, and can adapt to various power distribution scenes.

The invention relates to the technical field of power system fault detection, in particular to a factory power distribution system fault interval section determining method and system and terminal device.The factory power distribution system fault interval section determining method comprises the steps that when a power failure fault of a power distribution system is monitored, voltage and current data within a preset duration before the fault is obtained; comparing the phase current amplitude with a rated current threshold value, judging that the phase current amplitude is an external fault if the phase current amplitude does not exceed the limit, calculating a zero-sequence current if the phase current amplitude exceeds the limit, and comparing the zero-sequence current with a zero-sequence threshold value to distinguish a ground fault or an inter-phase fault; adaptively calling a phase difference analysis process according to an identification result, calculating a phase difference between a zero-sequence current and a zero-sequence voltage during a grounding fault, calculating a phase difference between a fault phase voltage and a fault phase current during an inter-phase fault, and judging whether a fault interval is internal or external according to a phase difference interval; and a structured message is automatically generated by integrating fault types, interval judgment and triggering criterion paths, so that quick and accurate fault positioning and handling are realized.

The application discloses a TN-C-S low-voltage power distribution system single-phase ground fault identification method, and belongs to the technical field of power system fault characteristics and relay protection. The single-phase ground fault identification method effectively solves the inadaptability problem of traditional single residual current protection by collecting residual current and zero sequence current and the fault current approximately separated by the algorithm of the application. The application collects residual current, zero sequence current data and three-phase power supply voltage data respectively, relies on the short-time invariability of the neutral point grounding resistance and the repeated grounding resistance, proposes to separate the fault current by using the residual current and the zero sequence current, then compares the fault current with the setting threshold to identify the single-phase high-resistance ground fault, and obtains the fault phase according to the matching of the phase of the separated fault current and the phase of the power supply voltage, so that the single-phase high-resistance fault identification and phase selection identification are realized.

According to the short-circuit protection method and system based on the low-voltage alternating-current solid-state circuit breaker, whether the current rise rate exceeds a given threshold value or not is detected, and the short-circuit fault can be quickly removed while the circuit breaker effectively avoids surge current by utilizing the microsecond-level short-circuit fault cutting-off capability of the solid-state circuit breaker, so that the short-circuit protection effect is improved. The function of rapidly and accurately removing the short-circuit fault of the ship power system is achieved. According to the method, the current rise rate is detected while the current is detected, so that the surge current and the short-circuit current are distinguished, short-circuit protection is prevented from being started by mistake, and the problem that a solid-state circuit breaker in a ship low-voltage alternating-current power system recognizes the surge current as a short-circuit fault, and consequently misoperation is caused is effectively solved. The method can give full play to the microsecond-level short-circuit fault removal capability of the solid-state circuit breaker, and facilitates the selective protection design of multistage nodes of a power distribution system.

The goal is to efficiently select smart meters from among the smart meters in the power distribution system to be used as voltage measurement points for understanding the voltage distribution of the power lines. [Solution] The voltage measurement point determination system (1) includes an equipment data storage unit (3) for storing equipment data of high-voltage distribution lines in a distribution system (9), a first measurement data storage unit (4) for storing first measurement data measured by equipment in the distribution system during a predetermined measurement period, a second measurement data storage unit (5) for storing second measurement data measured by smart meters of consumers in the distribution system during a predetermined measurement period, and a control unit (200) for determining a smart meter to be used as a voltage measurement point for understanding the voltage distribution of the distribution system from among the smart meters of consumers, based on the equipment data, the first measurement data, and the second measurement data.

A power distribution system and method of operation for an aircraft includes determining, by a supplemental power system, an operation mode of the aircraft, selecting, by the supplemental power system, at least one supplemental power source of a set of at least two supplemental power sources, and at least one of receiving a first current from the main power bus by the selected at least one supplemental power source, or selectively providing a second current to the main power bus from the selected at least one supplemental power source, based on an operating mode of the aircraft.

A protection system of ship's power distribution system, when a fault occurs in the feeder preset to be in charge of the third circuit breaker module, the relay of the third circuit breaker module trips the circuit breaker based on a magnitude and a direction of a fault current, and to transmit a power distribution maintenance signal to the relay of the second circuit breaker module. When a fault occurs in the switchboard preset to be in charge of the second circuit breaker module, the relays of the second and third circuit breaker modules trip the circuit breaker based on a magnitude and a direction of a fault current and the relay of the second circuit breaker module transmit a power distribution maintenance signal to the relay of the third circuit breaker module preset based on the magnitude and direction of the fault current.

The invention belongs to the technical field of lightning protection device testing, and particularly relates to a multi-station connection lightning protection device efficient testing device which comprises a base, a baffle is fixedly installed at the position, close to the rear side, of the top of the base, and a testing assembly is arranged on the front side of the baffle. The periphery of the eccentric wheel extrudes a pressing plate to move downwards, when the pressing plate moves downwards, a first spring is firstly extruded, along with continuous rotation of the eccentric wheel, the pressing plate makes contact with the top of the lightning protection device body and continues to move downwards, at the moment, a movable plate is pushed to move downwards through the action of the first spring, and then a second spring is extruded; the lightning protection device main body pin is in contact with the conductive block to test the lightning protection device main body, and the lightning protection device main body pin and the conductive block on the detection assembly are inserted more stably and accurately, so that the test precision of the lightning protection device is ensured, and the safety of power distribution switch control equipment such as an intelligent power distribution system and facilities is improved.

The invention discloses a self-locking circuit for a low-voltage power supply and distribution system, which integrates the functions of starting, self-locking keeping, overcurrent protection, state indication and resetting, is completely composed of analog and digital hardware electronic components, does not need to be controlled by any software program, and is simple in structure and convenient to use. The method is suitable for industrial automation, safety equipment power supply and other scenes with high reliability requirements.

The utility model discloses a high-stability low-voltage three-power-supply power distribution system, which comprises two paths of commercial power L1 and L2, a generator M and two sets of dual-power-supply automatic switching devices QCS1 and QCS2, one path of commercial power L1 is connected to an execution circuit breaker QF1 of the dual-power-supply automatic switching device QCS1, the other path of commercial power L2 is connected to an execution circuit breaker QF2 of the dual-power-supply automatic switching device QCS1, and the generator M is connected to the execution circuit breaker QF2 of the dual-power-supply automatic switching device QCS2. An output power source converted by the dual-power-source automatic switching device QCS1 is connected to an execution circuit breaker QF1 of the dual-power-source automatic switching device QCS2, a generator M is connected to an execution circuit breaker QF2 of the dual-power-source automatic switching device QCS2, and the output power source converted by the dual-power-source automatic switching device QCS2 is used for supplying power to a low-voltage power distribution system. The device has the characteristics of improving the stability of a low-voltage power distribution system, reducing the starting and stopping times of the generator, prolonging the service life of the motor and being stable in power supply.

This application discloses an auxiliary power supply module and a power distribution terminal, belonging to the field of power supply. The auxiliary power supply module includes a charging circuit, an energy storage unit, a power failure detection delay circuit, a boost circuit, and a power output terminal. The charging circuit is connected to the energy storage unit and is used to charge the energy storage unit using the main power supply voltage when the main power supply voltage is normal. The power failure detection delay circuit is connected to both the charging circuit and the boost circuit and is used to output a working voltage to the boost circuit when the main power supply voltage is less than a first target voltage for a target duration. The energy storage unit is connected to the boost circuit and is used to output a stored energy voltage to the boost circuit. The boost circuit is connected to the power output terminal and is used to supply power at the working voltage, converting the stored energy voltage into a supply voltage and providing it to the power output terminal. The supply voltage is used to power the power distribution terminal. This application can improve the service life of the auxiliary power supply module and improve the stability of power supply.

The application discloses a data-driven urban power grid multi-stage operation scheduling method and system, and establishes a mathematical model of a power distribution system coordination scheduling problem containing multiple energies; based on the obtained mathematical model of the power distribution system coordination scheduling problem, a linear budget constraint generation method based on historical data is used to construct a budget uncertainty set; based on the obtained budget uncertainty set, a multi-stage robust optimization method based on an implicit decision strategy is used to determine a coordination scheduling scheme; and the coordination scheduling of multiple resources and devices is adaptively optimized in a rolling time domain mode.

This invention provides a system for thermal protection in power distribution equipment. [Solution] The power distribution system 100 includes a first silicon-controlled rectifier (SCR) 106A and a second SCR 106B connected to a heat sink. A first temperature sensor 105A senses the temperature of the first SCR, and a second temperature sensor 105B senses the temperature of the second SCR. While the second SCR is disconnected from the load, the control unit compares the temperature from the first temperature sensor with a plurality of temperature thresholds, and in response that the temperature reading from the first temperature sensor exceeds a first threshold but not a second threshold, generates a first warning, and further, in response that the temperature reading from the first temperature sensor exceeds a second threshold, it may disconnect the first SCR from the load and connect the second SCR to the load.

The invention discloses a method for evaluating the maximum loading capacity of the DC side of a multi-terminal low-voltage DC power distribution system. The method comprises the following steps: 1, constructing a topological structure of the multi-terminal low-voltage DC power distribution system; 2, performing Thevenin equivalence on the AC side of the multi-terminal low-voltage DC power distribution system; 3, according to the Thevenin equivalent circuit, solving the range of the transmission active power of the alternating current side; and 4, constructing a power balance constraint equation, and evaluating the maximum load capacity of the direct current side. According to the method, accurate evaluation of the maximum load capacity of the DC side of the multi-terminal low-voltage DC power distribution system can be realized, so that safe and stable operation of the multi-terminal low-voltage DC power distribution system can be ensured.

The invention relates to the technical field of intelligent power grids, in particular to a flexible interactive adjustment method for a district-level micro-grid group based on a virtual power plant mechanism, which comprises the following steps of: acquiring real-time operation data of the district-level micro-grid group, constructing a communication topology and realizing high-precision time sequence alignment; based on the real-time operation data set, calculating adjustable resources of each micro-grid through a fuzzy evaluation model, and generating system-level aggregation adjustment capability by adopting a weighted aggregation algorithm; according to the aggregation adjustment capability and the operation demand of the power distribution system, calculating a flexible interaction adjustment instruction by using a multi-objective optimization model; and issuing and executing the real-time operation data set through a distributed control protocol and updating the real-time operation data set based on a Kalman filtering algorithm. According to the method, dynamic aggregation of adjustable resources of the micro-grid group, safe distributed execution of flexible instructions and closed-loop self-updating of data are realized, and the adjustment precision and the operation stability of the district-level virtual power plant are improved.

The invention relates to the technical field of expressway power supply and distribution, in particular to an expressway long-distance power supply and distribution system and a fault isolation method. Comprising a power supply line which is laid along a highway and is used for long-distance transmission of electric energy, a boost converter device which is arranged at a power supply point at an entrance and an exit of the highway, and buck converter devices which are dispersedly arranged near electric equipment along the highway, intelligent section switches are installed in series on power supply lines between outlets of the step-up current conversion devices and the step-down current conversion devices, and the intelligent section switches divide an original whole long line into a plurality of independent sections. The situation that the whole line breaks down when one fault occurs is thoroughly changed, accurate fault isolation and rapid power supply recovery ('N-1' operation) are achieved, and the influence range of power failure is reduced to the minimum.

The invention belongs to the technical field of aircraft power distribution design, and particularly relates to a dual-redundancy power distribution system switching circuit and a control method. The switching circuit designed by the invention is composed of one contactor and five relays, a bus bar fault switching function is realized by adopting a high-reliability device, a redundancy controller can be replaced, the cost and the weight are reduced, and the reliability is not reduced; the circuit form is simple, and maintenance and troubleshooting are convenient after modular design; the capacity of the main emergency power supply and the capacity of the special emergency power supply are independently designed without mutual coupling, and the difficulty of power distribution design is reduced.

The present application relates to the technical field of rail transit power supply system, and proposes a kind of urban rail transit power supply substation main wiring system based on energy router, including medium voltage bus, at least one transformer, at least one energy router, at least one contact switch and low voltage bus;The medium voltage bus is segmented by contact switch;The high voltage side of transformer is connected to the medium voltage bus, and the low voltage side of transformer is connected with energy router;Energy router is provided with at least one AC port and at least one DC port, and contact switch is used to connect AC port or DC port between different energy routers.Through integrating traction and distribution system, civil space is saved.The main wiring structure of substation is optimized, the number of equipment and switch is reduced, the system investment cost is reduced, the performance of traction power supply system can be improved, the power flow of power supply system is controllable and adjustable through energy router, not only the output of transformer can be balanced, but also line loss can be effectively reduced.

The invention discloses a multi-objective optimization management method and system based on a multi-level converter, and relates to the technical field of power distribution system control, and the method comprises the steps: obtaining the operation data of each power branch in the multi-level converter, and extracting a health state parameter and a current output power value from the operation data; inputting the health state parameters into a preset health degree scoring model to obtain a health degree score of each power branch; determining a target power distribution strategy from a preset power distribution strategy set; inputting a total output power instruction and the health state parameters into the target power distribution strategy to obtain a target power distribution value of each power branch, and generating a modulation control instruction according to the target power distribution value; and sending the modulation control instruction to a driving circuit of the multi-level converter, and controlling each power branch to execute a switching action according to the target power distribution value. The system availability and the power supply reliability are improved.

The invention provides a power distribution system and a power distribution method. The power distribution system comprises a source end main power distribution unit and multi-layer direct current power distribution units which are in hierarchical connection. Any layer of direct-current power distribution unit in the multiple layers of direct-current power distribution units is used for supplying power to a load connected with the any layer of direct-current power distribution unit based on an input voltage provided by a connected previous layer of direct-current power distribution unit, and the load has a required voltage corresponding to the any layer of direct-current power distribution unit; and the power supply unit is used for supplying power to the next-layer direct current power distribution unit connected with any layer of direct current power distribution unit, and the upper-layer direct current power distribution unit of the first-layer direct current power distribution unit in the multiple layers of direct current power distribution units is a source end main power distribution unit. According to the application, a distributed power supply system architecture is constructed through the source end main power distribution unit and the multi-layer direct current power distribution units in hierarchical connection, flexible deployment of the direct current power distribution units can be supported, meanwhile, the power supply demand of a load is met through voltage hierarchical management, and the power supply efficiency and the power supply stability of the power distribution system can be improved.

The invention discloses a power distribution network high-resistance grounding fault initial traveling wave head calibration method, and relates to the field of power distribution system protection and fault positioning. The method comprises the steps of obtaining a fault voltage signal of a measurement node in a power distribution network, and calculating a line mode component of the fault voltage signal; extracting a fault transient component from the line mode component; calculating an integral deviation waveform of a fault transient component to select a fault sudden change time window; a multi-scale time window differentiator is constructed, fault initial traveling wave arrival time is accurately calibrated in a fault sudden change time window, and accurate time data is provided for power distribution network fault traveling wave positioning, so that accurate fault positioning is realized.

The application discloses a hybrid regenerative braking energy absorption system and a control method thereof. The system has three different branches, namely a branch one feeding back to a 400V power distribution system, a branch two feeding back to a secondary side 1180V loop of a rectifier transformer and a branch three storing regenerative braking energy by using an energy storage unit. The regenerative braking energy is firstly supplied to a low-voltage power and lighting system through the branch one. If the braking energy is greater than the rated capacity of the branch one, the excess energy is fed back to a high-voltage AC power grid through the branch two and the rectifier transformer for a traction substation high-voltage. If the regenerative braking energy is greater than the capacity of the entire feedback part, resulting in continuous increase of the traction grid voltage, the excess energy is stored by the energy storage unit. Any branch in the system can be operated independently, and the required floor area is small, so that the system is convenient to access the already operated urban rail transit traction substation.

The invention discloses a low-voltage power distribution integrated architecture, a power distribution system and a vehicle, and the low-voltage power distribution integrated architecture comprises a first load voltage end, a second load voltage end, a low-voltage battery, a first bidirectional DC conversion circuit, and a power distribution circuit. A power distribution circuit, a low-voltage battery and a first bidirectional DC conversion circuit are controlled by the same controller to supply power to a first load voltage end and a second load voltage end, and the first load voltage end and the second load voltage end can respectively provide a first voltage and a second voltage to the outside according to low-voltage load requirements. Therefore, the controller can flexibly control the low-voltage power distribution system, when a vehicle is provided with a high-power load, the load voltage end with higher output voltage can provide electric energy for the vehicle, the output current of the low-voltage power distribution system can be greatly reduced under the same power, and potential safety hazards of the low-voltage power distribution system are reduced.