56 results about "Voltage gradient" patented technology

The invention relates to the technical field of power distribution automation auxiliary power supply control, and discloses an intelligent power distribution circuit system for a digital ring main unit, which comprises a transient voltage gradient induction bridge circuit, a hardware signal processing circuit, a power switch unit and a controlled energy release unit, according to the system, a transient voltage gradient induction bridge circuit is used for collecting a primary side bus voltage change rate signal, a hardware signal processing circuit carries out derivation operation on an induction signal and compares the induction signal with a voltage gradient threshold value, and a power switch unit is blocked at the moment that the voltage abnormally drops so as to cut off a load current path. According to the invention, a hardware parameter direct mapping mechanism is utilized to realize microsecond transient protection response, and the physical decoupling of protection logic and digital software is realized by balancing bus potential pulse caused by sudden unloading of a load through the inherent dehumidification resistor in the multiplexing cabinet.

The invention relates to the technical field of antenna control, and discloses a control method for a leaky-wave antenna and a communication device. The method comprises the following steps: measuring the dispersion characteristic of the leaky-wave antenna, establishing a second-order nonlinear mapping relation between a propagation constant and a control voltage, and obtaining a dispersion control parameter group; reversely deducing the target beam directional angle to obtain a target propagation constant, and calculating an initial voltage value of each control unit in combination with the parameter group to form a voltage gradient control sequence; correcting the propagation constant of each unit by adopting a distance compensation algorithm, and recalculating to obtain distance self-adaptive voltage distribution data; and detecting a beam quality factor in real time, updating voltage distribution data through a gradient descent algorithm when the beam quality factor deviates from a target value, and outputting a control voltage sequence to drive each control unit. The leaky-wave antenna control method and device solve the problems that in an existing leaky-wave antenna control technology, the beam quality is reduced and the data rate is sharply attenuated during long-distance transmission, and the beam control precision and the long-distance transmission performance of the leaky-wave antenna in the terahertz frequency band are improved.

The invention relates to the technical field of intelligent identification of a grounding grid step voltage abnormal area, and specifically discloses an intelligent identification method of a grounding grid step voltage abnormal area. Comprising the steps of multi-source sensing data acquisition, data sliding filtering processing, dynamic threshold parameter generation, voltage gradient matrix construction, collaborative judgment result generation and abnormal identification threshold optimization. Multi-source sensing data is comprehensively acquired by using a distributed sensor network, noise interference is effectively removed through sliding filtering processing, then a dynamic threshold parameter is generated in combination with historical operation data and real-time environment parameters, meanwhile, a voltage gradient matrix reflecting potential field spatial characteristics is constructed, an abnormal area is judged and accurately identified through cooperation of the two, and then the abnormal area is accurately identified. According to feedback information, an optimization direction is analyzed, an abnormal identification threshold value is dynamically adjusted, a complete intelligent optimization closed loop is formed, double verification and accurate identification of the state of the grounding grid are achieved, and the intelligent management level is improved.

The invention relates to the technical field of battery testing, in particular to a multi-channel battery charging and discharging testing system and method. The method comprises the following steps: acquiring voltage data of each battery unit in a multi-channel battery, performing voltage gradient layering processing on the voltage data of each battery unit, and dividing the battery unit into a plurality of voltage intervals; the number density of the battery units in each voltage interval is detected, and a voltage gradient distribution diagram is generated; collecting a current distribution coefficient of each connection point of the multi-channel battery; performing current distribution difference analysis on the current distribution coefficient, calculating the actual current distribution proportion of each unit in different charging and discharging stages, and generating current distribution difference data; the overall temperature change data of the multi-channel battery in the charging and discharging process and the local temperature data of each battery unit are collected. According to the invention, analysis and prediction of the charging and discharging performance of the multi-channel battery are realized through a battery test technology, so that the accuracy of evaluation of the charging and discharging performance of the multi-channel battery is improved.

The invention discloses an automatic test method and system for a resistor. The method comprises the following steps: acquiring a to-be-tested resistor; configuring a dynamic impulse voltage gradient parameter and a staged acquisition strategy for the to-be-tested resistor; based on the dynamic impulse voltage gradient parameter and a staged acquisition strategy, acquiring response voltage, response current and temperature data of the to-be-tested resistor under different impulse voltages as target data; performing feature extraction on the target data, and determining an anti-surge index and an impact response consistency index corresponding to the to-be-tested resistor based on the extracted features; generating a test report according to the anti-surge index and the impact response consistency index; the resistor performance data is acquired in multiple dimensions, and the resistor is accurately tested based on a resistor performance evaluation quantification system.

The invention belongs to the technical field of electronic power, and particularly relates to an LCL grid-connected inverter model-free predictive current control system and method based on sampling noise compensation, and the system comprises an inverter main circuit, an LCL filter and a controller. The controller is configured to firstly calculate a current gradient and a voltage gradient according to a collected system operation signal; then, a second-order generalized integrator is used for conducting accurate compensation on sampling noise contained in the gradient; and finally, executing a model-free predictive control algorithm based on the compensated gradient, and preferably selecting an optimal voltage vector through a multi-objective value function integrating inverter side current, capacitor voltage and network side current. According to the method, sampling noise interference is effectively suppressed, the control precision and the anti-interference capability of the system are improved, and stable and efficient operation of the LCL grid-connected inverter can be realized without additional damping.

The invention discloses a fault detection method for a flexible DC power transmission system and a related device, and the method employs a voltage gradient algorithm to detect whether the flexible DC power transmission system breaks down, and carries out the fault type discrimination based on the ground model voltage polarity through a sampled voltage signal when the system breaks down. And determining a high-frequency impedance difference value ratio of a rectification side and an inversion side in the flexible DC power transmission system based on the voltage signal and the sampled current signal, carrying out fault direction discrimination based on the high-frequency impedance difference value ratio, and finally determining a fault detection result according to a fault type and a fault direction. Therefore, the fault pole selection is realized based on the ground model voltage polarity, and the internal and external faults are accurately distinguished through the high-frequency impedance difference ratio, so that the reliability of fault detection of the flexible direct-current power transmission system is improved.

This invention discloses a high-voltage-gradient tin oxide varistor ceramic with adjustable nonlinear coefficients, its preparation method, and its applications, belonging to the field of functional ceramics and their preparation technology. This invention solves the problems of low voltage gradient, difficult-to-control nonlinear coefficients, and limited application in surge protection devices of existing SnO2-based ceramic materials. This invention employs multiple metal oxide composite doping and solid-state sintering to control the varistor performance of SnO2 ceramics through both doping and sintering processes.

The invention discloses ZnO-based voltage-sensitive semiconductor ceramic as well as a preparation method and application thereof, and belongs to the technical field of semiconductor ceramic. The ZnO-based voltage-sensitive semiconductor ceramic provided by the invention is prepared from the following components: ZnO, Bi2O3, MnO2, Co3O4, Cr2O3, Sb2O3, Al (NO3) 3, a disulfide bond organic silicon cross-linking agent, a photothermal conversion agent, a photoinitiator, a dispersing agent and a solvent I. The ZnO-based voltage-sensitive semiconductor ceramic has the characteristics of continuous thickness and uniform components, the voltage gradient and the nonlinear coefficient of the ZnO-based voltage-sensitive semiconductor ceramic are superior to those of a traditional product, the parameter drift rate after surge impact is small, and the ZnO-based voltage-sensitive semiconductor ceramic can be applied to high-end application scenes such as vehicle-mounted chargers of new energy automobiles.

The utility model relates to the technical field of power supply, and discloses a power supply switching circuit based on multi-voltage gradient interlocking and electronic equipment, the power supply switching circuit comprises at least two power supply control circuits, each circuit has a corresponding priority, and the circuit with the high priority is provided with a priority control module, the priority control module controls a circuit where the priority control module is located to be switched on and controls a circuit with a lower priority to be switched off under the power supply of the target power port; the power supply control circuit supplies power to a target output port under the control of a priority control module arranged in the power supply control circuit, and controls a circuit with a higher priority to be switched off, thereby realizing interlocking among the circuits. Therefore, by implementing the power supply switching circuit, the switching operation of the power supply switching circuit can be simplified, the switching efficiency and the switching speed of the power supply switching circuit can be improved, meanwhile, the accuracy and the reliability of power supply switching are improved by setting corresponding priorities for different input voltages, and the diversity and the flexibility of power supply switching are improved.

The embodiment of the invention provides a multi-voltage platform control method and device and related equipment, and relates to the technical field of vehicle engineering. The method comprises the following steps: when a high-voltage battery and a first DC / DC converter are in a normal state, controlling the first DC / DC converter to be in a working mode; based on a first preset voltage gradient, the voltage of a first low-voltage battery is boosted to a first preset working voltage, and the first low-voltage battery is used for supplying power to a first low-voltage electric appliance; when the high-voltage battery and the first DC / DC converter are in the normal state, judging the state of the second DC / DC converter; when the second DC / DC converter is in the normal state, controlling the second DC / DC converter to be in a working mode; and based on a second preset voltage gradient, the voltage of a second low-voltage battery is boosted to a second preset working voltage, and the voltage of the second low-voltage battery is used for supplying power to a second low-voltage electric appliance. According to the embodiment of the invention, the three voltage platforms can work simultaneously and independently.

The invention relates to the technical field of power system analysis, and discloses an electrograph analysis method for adjustable resources. The method comprises the following steps: establishing a unified topology model comprising a power station, a power transmission line, a transformer substation, a user and adjustable resource nodes, wherein the adjustable resource nodes comprise photovoltaic equipment, energy storage equipment and charging station equipment; collecting real-time operation parameters of each node, and generating a dynamic topological data set containing a voltage fluctuation sequence, a power transmission rate and equipment response delay data; performing multi-dimensional space mapping on the set to generate a distribution characteristic spectrum containing voltage gradient distribution, a power flow thermodynamic diagram and an equipment collaborative response matrix; deducing a resource state based on the map to obtain an adjustment potential evaluation result and a topological relation traceability path; and dynamically reconstructing the model according to an evaluation result, and generating an optimized resource scheduling instruction set. According to the method, power node information is integrated, accurate management and control of adjustable resources are realized, and complex operation requirements of a modern power system are met.

A battery diagnosis apparatus includes an obtaining unit configured to obtain first voltage values of a plurality of respective battery units, an identifying unit configured to identify second voltage values in different idle periods from among the first voltage values, a determining unit configured to determine a voltage gradient indicating a change degree of the second voltage values of the plurality of respective battery units over time and determine a standard score (Z-score) of the voltage gradient for each of the plurality of battery units by using an average and a standard deviation of a plurality of voltage gradients one-to-one corresponding to the plurality of battery units, and a diagnosing unit configured to select, from among the plurality of battery units, a battery unit having the standard score outside of a first reference range and the voltage gradient outside of a second reference range and diagnose at least some of selected battery units as abnormal battery units.

The invention relates to a method for preparing graphene by stripping graphite through electrochemical anode intercalation, and belongs to the technical field of graphene preparation, the method comprises the following steps: S1, carrying out pre-intercalation treatment on a graphite electrode to obtain an intercalated expanded graphite electrode; s2, taking the intercalated expanded graphite electrode in the S1 as an anode, taking a platinum sheet electrode as a cathode, putting the anode and the cathode into the electrolyte, and electrifying to complete first stripping; and S3, replacing the anode in the S2 with a platinum sheet electrode, electrifying, carrying out secondary stripping to obtain a graphene mixed solution, and filtering and washing the graphene mixed solution after stripping to obtain the graphene material. Compared with the prior art, the preparation method has the advantages that graphene is prepared through secondary stripping, the first stripping utilizes intercalation expansion of a graphite electrode, and Van der Waals' force between graphite layers is destroyed through voltage gradient change; in the second stripping process, a stable electric field is maintained through a platinum sheet electrode, graphite electrode consumption is avoided, and stripping efficiency and product uniformity are improved.

This application relates to the field of battery energy storage system safety technology, and discloses a method, device, and electronic device for preventing thermal runaway. The method includes: acquiring multiple battery information items of a battery pack in a battery energy storage system, wherein the multiple battery information items include at least two of electrochemical impedance spectroscopy information, voltage gradient information, and temperature field distribution information; extracting features from each battery information item to obtain multiple battery features; inputting the multiple battery features into a pre-trained thermal runaway prediction model to obtain a runaway risk score output by the thermal runaway prediction model to represent the thermal runaway risk; and generating and triggering an energy release command for the battery pack when the runaway risk score is within a target score range.

The application relates to a probe for detecting a buried pipeline voltage gradient, which comprises a probe main body, a probe head assembly, a locking positioning part, an aviation plug and a switch button; the probe main body comprises an outer pipe and an inner pipe, a part of the lower end of the inner pipe is an installation section, the installation section is located outside the outer pipe, and the probe head assembly is installed on the installation section; the upper end of the inner pipe is located inside the outer pipe, and the upper end of the inner pipe is tightly fixed with the inner side wall of the outer pipe through the locking positioning part; a part of the upper end of the outer pipe is an assembly section, the assembly section and the upper end of the inner pipe are arranged in the respective axial directions and are spaced apart, a sleeve is arranged on the assembly section, and the free end of the sleeve is provided with the switch button; the aviation plug is arranged on a section between the assembly section and the inner pipe of the outer pipe; the probe head assembly is electrically connected with the aviation plug through cables, and the aviation plug is electrically connected with the switch button. The application realizes the collection of alternating voltage gradient and direct current voltage gradient at the same time in the detection outside the buried pipeline, reduces the labor intensity, improves the detection efficiency, and obtains more current pipeline information.

The application discloses an SRAM in-memory computing circuit for quantifying the voltage difference of a redundant row, comprising a row decoding module, a pre-charge circuit, a timing control circuit, a word line data control module, a redundant row control circuit and a quantification result statistical circuit, and an SRAM storage array; the timing control circuit is connected with the row decoding module, the word line data control module, the pre-charge circuit, and the redundant row control circuit and the quantification result statistical circuit; the row decoding module is connected with the word line data control module; the SRAM storage array is connected with the word line data control module, the pre-charge circuit, and the redundant row control circuit and the quantification result statistical circuit; the SRAM storage array is a 6T SRAM storage unit with N*N rows, specifically comprising two redundant rows and a plurality of computing rows. The circuit can effectively reduce the influence of the voltage gradient change in the array caused by the word line pulse width distortion and other factors on the computing result, and reduce the area consumption.

The application discloses a ZnO pressure-sensitive ceramic and a simple low-temperature sintering method. The composition of the ZnO pressure-sensitive ceramic is [100-(a+b+c+d+e)] mol% ZnO+amol% Bi2O3+bmol% Co3O4+cmol% Mn2O3+dmol% Cr2O3+emol% SnO2, wherein 2.1<=a+b+c+d+e<=7.5. The ceramic is sintered at a sintering temperature of 800-1000 DEG C, and the voltage gradient E of the ZnO pressure-sensitive ceramic is 1529-2362 V / mm, the nonlinear coefficient a is 63-86, the leakage current density I is 0.2-0.7 mu A / cm b , and the performance is better than that of the commercially available ZnO pressure-sensitive ceramic at the present stage, and the performance requirement of the pressure-sensitive ceramic in actual production can be met. L 2 ​​

The application provides a power transmission line grounding fault positioning and analysis processing method and system, relates to the technical field of power system fault processing, and comprises the following steps: acquiring zero sequence component data and topological relations of monitoring points; extracting a fault feature vector reflecting impedance characteristics of a grounding path; determining a candidate fault section according to the direction distribution and amplitude attenuation law of the feature vector in the topology; constructing a zero sequence voltage propagation distribution function in the section, and solving the position of the zero sequence voltage gradient extreme point; identifying a fault type and a transition resistance state, and executing fault isolation. The application can accurately position a fault position and improve fault processing efficiency.

This invention relates to the field of intelligent identification technology for step voltage anomaly areas in grounding grids, specifically disclosing an intelligent identification method for such areas. The method includes: multi-source sensor data acquisition, data sliding filtering, dynamic threshold parameter generation, voltage gradient matrix construction, collaborative judgment result generation, and anomaly identification threshold optimization. This invention utilizes a distributed sensor network to comprehensively acquire multi-source sensor data, effectively removes noise interference through sliding filtering, and then combines historical operating data with real-time environmental parameters to generate dynamic threshold parameters. Simultaneously, a voltage gradient matrix reflecting the spatial characteristics of the potential field is constructed. After accurate identification of anomaly areas through collaborative judgment, the feedback information is used to analyze and optimize the direction, dynamically adjusting the anomaly identification threshold to form a complete intelligent optimization closed loop. This achieves dual verification and accurate identification of the grounding grid status, improving the level of intelligent management.

The invention discloses a discharge scribing experiment method and device for a single-row diamond abrasive particle of a hard and brittle material, and belongs to the technical field of abrasive particle scribing. The method comprises the following steps: cutting a hard and brittle material into a square sample, polishing the sample to a specified precision requirement, and then fixing the sample on a grinding machine platform through a parallel jaw vice; the single-row diamond abrasive particle grinding wheel is installed on a grinding machine and connected with a pulse power source; and controlling the grinding machine to complete tool setting, rotating and feeding according to a specified rotating speed, carrying out an experiment according to a set voltage gradient, and carving a plurality of controllable scratches on the surface of the sample workpiece. The single-row diamond abrasive particles are adopted, and the mechanical property of the surface of the hard and brittle material is changed through the instantaneous temperature of electric spark discharge, so that the one-piece effect of the single abrasive particles is overcome, the removal behavior of mechanical grinding is improved, the service life of the grinding wheel is prolonged, the surface quality of a workpiece is improved, and cooling liquid and corrosive liquid are not needed; and the grinding method is low in cost and environmentally friendly.

The invention discloses a voltage distribution sensor for measuring the voltage drop of a short circuit port of an aluminum electrolysis cell, which comprises a bus body, a fixed frame is fixedly arranged on the side surface of the bus body close to the top end, a track groove body is fixedly arranged on the fixed frame, and a movable assembly is rotationally arranged in the track groove body. According to the invention, a fixed rail groove structure which can be directly installed on the side surface of the bus body is designed, and the extrusion block which can move along the rail and multiple groups of telescopic probe assemblies which are linearly arranged are combined, so that the direct, online and refined measurement of the voltage distribution on the surface of the bus body is realized; according to the method, the limitation that the prior art depends on overall parameter calculation or off-line spot measurement is fundamentally overcome, the internal voltage gradient change of the short circuit port can be captured in real time, the timeliness of hidden danger discovery is remarkably improved, and safety accidents such as continuous deterioration, local fusion and even ignition and blasting caused by contact surface oxidation, looseness or local overheating are effectively prevented.

A photon or electron detector may include a polysilicon resistive gate having a voltage gradient applied to reduce hysteresis and improve operating speed. The polysilicon resistive gate may be doped polysilicon heavily doped with donor atoms or acceptor atoms and ion implanted with non-electroactive species. The non-electroactive species may be implanted in a pattern to form a plurality of ion implantation regions having different electrical resistivity. The ion implantation region is formed in a selected pattern to control the resistivity of the polysilicon resistive gate and modify a lateral electric field across the differentially biased polysilicon resistive gate. The X-ray detector may also include circuit elements with current mode differential connections to improve clock feedthrough and power dissipation characteristics.

The application relates to the field of power battery management, and discloses a lithium iron phosphate battery pack equalization charging control method and system, which comprises the following steps: capturing weak attenuation characteristics hidden in a total pressure curve through local gradient comparison, forming a potential energy attenuation scanning layer for revealing implicit weak attenuation battery cells; dynamically calibrating potential imbalance of battery cells hidden by large current according to the cross mapping of voltage gradient mutation and line impedance difference in the potential energy attenuation scanning layer; performing nonlinear interaction analysis on the implicit attenuation mapping sequence and the whole group voltage data, utilizing micro-voltage trend superposition to capture the hidden evolution path of weak attenuation battery cells; adopting a multi-scale local equalization strategy to regulate the single battery charge-discharge ratio and branch current, iteratively approaching the group equalization state, and actively inhibiting false deviation signals generated by line differences; and calculating the whole pack equalization efficiency and the remaining capacity improvement rate to form quantifiable performance indicators. The application has the advantage of improving the whole pack capacity utilization rate.

This invention provides a model-free predictive current control (MFPCC) method for permanent magnet synchronous motors (PMSMs) with vector preselection, based on a hyperlocal model. Based on the hyperlocal model, this invention proposes a low-complexity multi-vector MFPCC. First, a hyperlocal model is used to replace the motor model in traditional MPC, reducing the impact of motor parameter mismatch. Then, to estimate the disturbance term in the hyperlocal model, a sliding diaphragm observer based on a variable-gain reaching law is designed. Finally, a three-vector algorithm with vector preselection is proposed. This preselection scheme evaluates the vector position based on the voltage gradient concept, directly obtaining the optimal voltage vector without traversing vectors and evaluating cost functions, thus reducing computation time.

The application relates to the technical field of fault positioning, and discloses an intelligent cable fault positioning method and device for a photovoltaic system. The method comprises the following steps: obtaining a feature data matrix containing voltage difference between components, string current change rate, component power value and adjacent component voltage ratio by performing characteristic parameter calculation and processing on component-level synchronous sampling data; obtaining component abnormal state marking data by performing multi-dimensional threshold analysis and sliding variance analysis processing on the feature data matrix; obtaining cable fault type judgment data by performing decision tree classification processing on the component abnormal state marking data; obtaining cable fault point position data by performing voltage gradient analysis processing on the region where the cable fault type judgment data is located; and performing fault information integration processing on the cable fault point position data and the cable fault type judgment data to obtain cable fault diagnosis data. The application improves the efficiency and accuracy of intelligent cable fault positioning of the photovoltaic system.

The invention discloses an FPC board lamination method and system based on air bag pressure control, and relates to the technical field of FPC board lamination, and the method comprises the steps: carrying out the pressure calibration through a preset voltage gradient, and building a voltage-pressure mapping library; real-time fitting control is carried out according to the voltage-pressure mapping library, and the voltage of a target air bag is obtained; and based on the target air bag voltage, carrying out lamination operation, and obtaining an FPC board lamination result. A voltage-pressure mapping library is used, a spring mechanical model can be avoided, direct mapping of voltage and pressure is established through experimental data, updated data are automatically calibrated at regular intervals, a pressure value is input according to requirements after calibration is completed, corresponding voltage is automatically found in a calibration file and input to a pressure sensor, and the influence of long-term attenuation can be eliminated.

The invention discloses a test device for a power transformer, and belongs to the technical field of power transformers, the test device comprises a main body module and a test module, the main body module comprises a device main body, the top of the inner wall of the device main body is fixedly connected with a test port, and the device main body is internally provided with an adjusting cavity; a resistance tube is arranged between the top and the bottom of the inner wall of the adjusting cavity, and through the arrangement of a lifting assembly, a connecting assembly, a linkage transmission assembly, a T-shaped block, an equidistant adjusting assembly, an isosceles trapezoid block and a touch button, the defect that a continuous voltage adjusting mode is difficult to adapt to a standardized test process in the prior art is effectively overcome; according to the invention, the distance between the plurality of isosceles trapezoid blocks is adjusted through the equidistant adjusting assembly, thereby achieving the flexible presetting of the test voltage gradient, meeting the different demands of different transformers for the test step length, thoroughly eliminating the uncertainty caused by manual operation, and remarkably improving the standardization and intelligentization level of the test.

The application provides a 10kV fixed external series gap lightning arrester fault identification method, which comprises the following steps: a power supply is obtained by an induction power circuit using a power frequency alternating current field to transform induced charge, so as to provide working power supply for a fault diagnosis circuit and a fault indication module; a voltage gradient detection circuit collects a power frequency alternating current signal of the 10kV fixed external series gap lightning arrester and converts the signal into a direct current level signal; the fault diagnosis circuit detects the direct current level signal to determine whether the lightning arrester is faulty; and the fault indication module sends an alarm indication signal when the fault diagnosis circuit detects that the lightning arrester is faulty. The application can check and replace the aging 10kV fixed external series gap zinc oxide lightning arrester in the line in advance, so as to prevent the occurrence of line operation accidents and the expansion of faults.

This application relates to tunable optical wedges for beam steering. A voltage-controlled optical wedge is formed by creating an adjustable voltage gradient along the length of a relatively large dimension LC cell. A pair of bias voltages (AC voltages) are applied at opposite side terminals of the LC cell, with the RMS values selected to create a continuous phase change along the length of the cell, with a defined phase change associated with a particular beam steering angle. Adjustment of the applied bias voltages (specifically, a change in the RMS values of the bias voltages) results in a change in the beam steering angle, providing active, controllable beam steering as a function of time. The LC cell can be configured to provide a linear or non-linear continuous phase change, as preferred for different beam steering applications.