103 results about "Voltage gradient" patented technology

The invention discloses a sampling implementation method and system suitable for motor protection quick response, belongs to the technical field of motor protection, and can increase the sampling frequency and improve the quick response of motor fault protection. Comprising the steps that motor phase current and bus voltage are collected, after anti-aliasing filtering is conducted, parallel sampling is conducted through a main ADC module and a redundant ADC module which are independently configured, and the following operations are synchronously executed based on a double-buffer-area framework: in a first buffer area, a compensation coefficient updating period is dynamically adjusted, and convergence is restrained; in the second buffer area, generating a voltage gradient prediction sequence, and compensating data abrupt change; when the harmonic frequency spectrum amplitude or the voltage gradient prediction sequence exceeds the limit, an oversampling mode is triggered, a redundant ADC module is allocated to load a multi-order digital filter, and an independent hardware acceleration unit is started to process harmonic compensation and gradient prediction in parallel; and generating a dynamic safety envelope, and if the gradient extreme value in the preset continuous window breaks through the safety envelope, generating an overvoltage fault signal.

The invention discloses a battery cell equalization management system of an energy storage battery, and relates to battery equalization management, the battery cell equalization management system comprises an equalization control unit, a parameter coupling calculation module, a state traceability tracking module and a multi-physics field coupling module, and the state traceability tracking module stores full life cycle parameters of a battery cell by constructing a three-dimensional space-time coordinate system. According to the method, through coordinated operation of a multi-level dynamic regulator, voltage gradient spectrum analysis, nonlinear temperature compensation and convolution recursion calculation are fused for the first time, and the temporal-spatial resolution of parameter coupling modeling is remarkably improved; on the hardware architecture level, synchronous analysis of an electrode expansion strain field and an electrolyte concentration field is achieved through combined application of a distributed optical fiber sensor and a four-dimensional tensor calculation method; particularly, the improved residual memory network effectively captures weak correlation signals of dynamic processes such as capacity attenuation activation and polarization relaxation through a staged recession feature extraction mechanism.

The invention discloses a method for one-step electrifying extraction and separation of uranium elements from sandstone uranium ores, which comprises the following steps: adjusting the pH value of an activation environment to be less than or equal to 3 by using an activation leaching agent, and converting the uranium elements in the sandstone uranium ores into uranyl with positive charges and complexes thereof; and a direct-current electric field with the voltage gradient of 0.1-2 V / cm is applied between the cathode and the anode, so that the uranium element moves towards the cathode chamber under the action of the electric field and is selectively reduced on the cathode, and the uranium element is reduced into a low-valence insoluble uranium-containing substance through electrons to be precipitated on the surface of the cathode. According to the method, uranium ions only forming positive charges and complexes of the uranium ions are activated and leached, and the uranium element directionally moves towards the cathode under the electrophysical actions of electromigration, electroosmosis and the like, so that the extraction of the uranium element in the sandstone uranium ore is realized; and meanwhile, soluble uranium is reduced and fixed on the surface of the cathode conductive plastic electrode through electrochemical actions such as reduction generated by electrons on the surface of the cathode conductive plastic electrode, so that one-step separation and purification of the uranium element are realized.

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 discloses a far-field imaging system, a metasurface grating and an imaging terminal, and relates to the technical field of image generation. Dynamic environment compensation and imaging quality optimization are realized through cooperation of multiple modules of the system: the environment temperature is read in real time, the refractive index of the metasurface grating is corrected according to a pre-stored mapping relation, and a target wavefront function is constructed and dispersed to obtain an initial phase distribution matrix; dividing a focusing area in combination with a user sight line, and compensating and regulating a phase distribution matrix by voltage gradient; based on the divided buffer and background regions, a multi-region sampling rate is configured to generate a mask, and the collection efficiency of the key region is improved; monitoring far-field information change in real time, and selecting an interpolation or total variation strategy to update the image; by means of image definition feedback, a secondary phase correction term is superposed to optimize a phase distribution matrix; the problems of traditional far-field imaging in the aspects of environment adaptation, dynamic focusing, data acquisition and imaging quality are solved, and the method is suitable for augmented reality glasses and the like.

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.

A voltage detection system for a marine vessel is provided. The system includes at least one electrode set configured to detect a voltage gradient measurement at a location in a body of water surrounding the marine vessel, and a control system. The control system is configured to receive the voltage gradient measurement from each electrode set; compare each voltage gradient measurement to at least one threshold to determine a voltage threat level, and generate a threat response based on the voltage threat level.

The invention discloses a recycled concrete permeability detection system and method, and relates to the technical field of material science, and the system comprises an electric field auxiliary module which applies a preset voltage gradient through an electric field auxiliary device, obtains initial ion concentration distribution data and a current change signal from a recycled concrete sample, and obtains a reference parameter of a permeation process; the modeling and simulation module is used for constructing a pore structure model by adopting a finite element simulation method according to the reference parameters, fusing an ion migration rate and a non-uniform distribution characteristic, and determining a dynamic regulation and control scheme under the action of an electric field; according to the recycled concrete permeability detection system and method, dynamic regulation and control and real-time monitoring of ion permeability behaviors are achieved, the barrier property evaluation precision of recycled concrete is remarkably improved, and efficient technical support is provided for durability optimization of engineering materials.

The invention discloses a method for electrifying and extracting a uranium element from sandstone uranium ore, which comprises the following steps: adjusting the pH value of an activation environment to be less than or equal to 4 by using an activation leaching agent, and converting the uranium element in the sandstone uranium ore into uranyl with positive charges and a complex thereof; wherein the activation leaching agent is a mixed solution of FeCl3 and chlorine-containing inorganic acid; the sandstone uranium ore is activated and then introduced into a direct-current electric field, direct current with the voltage gradient of 1-4 V / cm is applied, the uranium element moves towards a cathode directionally under the action of the electric field, and uranium-rich leachate is collected at the cathode. According to the method, the uranium element in the sandstone uranium ore is controlled to only form positive charge ions and complexes, the use amount of the leaching agent is reduced, the leaching rate of the uranium element is increased, and the collection time of the uranium element is shortened, so that the purpose of extracting the uranium element in the sandstone uranium ore more efficiently and greenly is achieved.

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.

The invention relates to the technical field of electric energy distribution optimization, and discloses a high-voltage distribution box design and optimization method and system, and the method comprises the following steps: obtaining the electric field distribution data of a bus arrangement region of a high-voltage distribution box, detecting the potential difference, calculating the local field intensity distribution, determining the electric field gradient mutation point between buses, and screening the electric field gradient mutation region. According to the method, potential distribution is more balanced by obtaining electric field distribution data of a bus arrangement area of a high-voltage distribution box, calculating local field intensity and identifying an electric field gradient mutation area, a reasonable distance is kept between a high-voltage bus and a low-voltage bus based on electric field balance degree analysis and optimization of a bus arrangement mode, and the voltage gradient of a power supply path is detected in combination. According to the power demand fluctuation condition of the load end, the voltage change amplitude of the power supply path is calculated, the power supply path is dynamically adjusted, the optimized power supply scheme reduces local overvoltage and undervoltage phenomena of the high-voltage distribution box, and the working reliability of the high-voltage distribution box is improved.

The present invention provides a transformer and a method for arranging bushings of the transformer. A transformer includes a coil (20) and a bushing (10) for leading out a lead wire of the coil (20) to the outside of a transformer housing (30). The bushing (10) is arranged based on a voltage gradient on the coil (20) such that: a bushing part where the highest potential of the bushing (10) is located and a coil part of the coil (20) having the same potential as the highest potential of the bushing (10) are spatially opposed. The present invention realizes a compact design of the transformer, can more effectively utilize the limited space of the transformer, and reduces the weight of the transformer and the space occupation ratio of the substation.

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.

To provide a pulse power supply device having a gradient power supply capable of obtaining a negative voltage gradient without using a current source.SOLUTION: A pulse power supply device according to the present invention generates a pulse having a trapezoidal waveform with a predetermined voltage gradient by superimposing a DC voltage of a constant voltage and a ramp waveform voltage. The pulse power supply device generates, through inverter control, a ramp waveform voltage that is a voltage having a voltage gradient that changes linearly over time from a ground potential at a predetermined voltage change rate dv / dt, as well as generating a trapezoidal waveform voltage by superimposing the DC voltage and the ramp waveform voltage, and generates a pulse waveform from the trapezoidal waveform voltage and generates a pulse having a voltage gradient without using a current source.SELECTED DRAWING: Figure 1

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 invention discloses an open-loop current inversion method and a sensor array, and relates to the technical field of current measurement. According to the method, a first sensor and a second sensor are orthogonally arranged outside a to-be-detected wire, an array device is moved, sensor output signals and wire current data under different distances are acquired, and a function model of sensitivity, voltage gradient and distance is established. And carrying out inversion operation on the output of the sensor array by using the model. The first sensor and the second sensor are made of magnetoelectric composite materials; the magnetoelectric composite material is formed by compositing a magnetostrictive material and a piezoelectric material through epoxy resin and is cascaded by adopting a multi-layer structure. The magnetoelectric composite material sensor has the advantages of high sensitivity, low power consumption, miniaturization and the like. The open-loop inversion algorithm disclosed by the invention improves the measurement precision and the anti-interference capability.

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.