19 results about "Impedance response" patented technology

This application provides a battery impedance analysis method, apparatus, storage medium, and computer equipment. When analyzing battery impedance, an EIS test is performed on the target battery to capture various electrochemical behaviors of the battery during the test process through the dynamic characteristics in the test data. Therefore, the DRT spectrum generated by DRT analysis of the test data can intuitively display the impedance response time corresponding to different electrochemical processes in the time dimension. After determining the response range of each electrochemical process, standard charge-discharge cycles can be performed on the target battery. During the cycle, DCR tests are performed on the target battery for multiple selected cycles, and impedance decomposition is performed on the obtained DCR data based on each response range to achieve real-time subdivision of the overall impedance information. Finally, the impedance decomposition data obtained after subdivision for each selected cycle number are compared and analyzed to generate high-quality impedance analysis results.

This invention relates to the field of coordinated control of energy storage in new energy collection stations, and particularly to a coordinated control method for reactive power compensation of energy storage in new energy collection stations based on impedance reshaping. Based on the acquired three-phase AC signal, an analytical signal representation is obtained. Based on the analytical signal representation, a complex spectrum is obtained, and the impedance frequency response is determined. After processing with an exponentially weighted cumulative average filter, the actual impedance is obtained. Combined with the target impedance determined by the target impedance response model, the impedance error is determined. Based on the impedance error, a frequency-sensitive adjustment driving function is determined, and a new energy collection station adjustment residual loss function is constructed. The optimal complex impedance weighted path scheduling matrix is ​​determined. Simultaneously, a frequency segmentation objective function mechanism and a suppression function are introduced to construct a global optimization objective function, obtaining the optimal virtual impedance configuration. This solves the technical problems of resonance and stability issues, as well as reactive power response conflicts and low control efficiency caused by independent control strategies and a lack of coordinated adjustment.

The present application relates to the field of environmental monitoring and biosensing technology, and particularly relates to a detection method and system for new pollutants in ecological environment, comprising the following steps: S100: culturing specific effector cells in a biosensing channel, and collecting trans-epithelial electrical resistance (TEER) signals of the effector cells in real time; S200: monitoring a change rate of the TEER signals, and generating an enrichment triggering instruction when the change rate exceeds a preset threshold; S300: in response to the enrichment triggering instruction, introducing a fluid to be tested, which generates the change rate, into a surface-enhanced Raman scattering (SERS) detection cavity, and starting an active enrichment unit to in-situ concentrate the fluid to be tested, so that the volume of the fluid to be tested is contracted to a detection area of a SERS substrate; the present application uses impedance response of effector cells as a preliminary screening "sentinel", realizes targeted capture of only abnormal samples with acute toxicity, avoids ineffective detection of a large number of non-toxic water samples, and significantly improves monitoring efficiency.

This invention provides a method for constructing a simulation model of the impedance characteristics of a circuit breaker closing resistor under damage conditions. It relates to the field of simulation model construction technology. First, a bidirectional electromagnetic-thermal-mechanical multiphysics coupled simulation model is established, including a resistor element, a clamping spring, connecting conductors, and an insulating medium. Nonlinear temperature-varying resistivity and contact resistance related to clamping force are set. The steady-state field distribution is first solved at different DC operating points, and then a swept-frequency small-signal excitation is superimposed to generate an impedance-frequency characteristic curve. Finally, the model parameters are calibrated by comparing with measured data from a healthy sample of the same model. This invention implements a joint solution strategy of DC bias steady-state and AC small-signal swept-frequency in the simulation, ensuring both the convergence stability of the strongly nonlinear electro-thermal coupling problem and realistically simulating the impedance response mechanism of the closing resistor under actual load conditions.

The present application relates to the technical field of electrical sensing detection, in particular to a screen electrical aging detection method based on DC impedance drift monitoring. The specific implementation process includes: using an electrical impedance sensor to apply a detection pulse and collect impedance response, constructing an initial impedance base map to form an impedance response curve; calculating impedance drift amount and drift rate to locate dielectric relaxation decay area, extracting impedance mutation boundary to identify aging characteristics; conducting spatial diffusion analysis on the impedance mutation boundary to distinguish between gate insulating layer aging and liquid crystal contamination aging; estimating the remaining reliable life of the screen according to the aging category, and forming a self-verification aging archive. The present application combines the spatial evolution of electrical characteristics with the physical wiring or backlight heat distribution characteristics of the panel by using DC impedance drift monitoring and spatial distribution analysis technology, realizes the detection and classification of screen electrical aging, and improves the efficiency and traceability of screen aging management through life integration and register write-back mechanism.

An apparatus, a system, sensor, and a method for determining dissolved oxygen content in air and aqueous medium are disclosed herein. The dissolved oxygen content may be determined by irradiating the sensor comprising at least a photo-oxidizable compound by a light irradiation source, wherein the irradiation enables the photo-oxidizable compound to change its luminescent properties based upon photo-oxidation thereby enabling the quantification of the dissolved oxygen content in the medium. The dissolved oxygen content may be captured via the impedance response generated by interdigitated conducting electrode patterns included in the sensor. The dissolved oxygen content registered by the interdigitated conducting electrode patterns may be transmitted to a user device via a short range or long-range communication via an electronic circuit embedded within the sensor.

The present invention relates to the technical field of smart grids, and discloses a wide-band impedance modeling and dominant parameter identification method, system and medium for an offshore direct-drive wind turbine. Based on the grid-side converter structure of a direct-drive permanent magnet synchronous wind turbine generator set, by establishing a unified small-signal model considering the PLL, dq current control loop, sampling and modulation delay, and LCL filter link, the positive-sequence and negative-sequence impedance analytical expressions of the unit within a wide frequency band are obtained. And a comparative analysis is carried out on the influence of typical parameters such as the PLL bandwidth, grid-connected voltage, LCL filter inductance, and filter capacitance, and their influence on the impedance response is analyzed, and it is identified that the main influence sources of the wide-band impedance of the unit are concentrated on the dynamic process inside the control system. Through the method of the present invention, accurate modeling of the wide-band impedance of a direct-drive wind turbine and identification of the dominant factors can be achieved, providing a theoretical basis and engineering reference for the analysis of the grid-connected stability of the unit, the judgment of the oscillation mechanism, and the setting of control parameters.

This invention discloses an online diagnostic method and system for secondary circuit virtual connection faults in relay protection devices, relating to the field of power grid relay protection technology. The method includes: setting a multi-frequency safety perturbation signal and applying it to the perturbation-diagnostic branch; simultaneously collecting perturbation response observation data at different perturbation frequency bands; extracting equivalent impedance change characteristics, response time change characteristics, attenuation process change characteristics, and inter-band discrete characteristics from the perturbation response observation data to generate a virtual connection impedance fingerprint of the secondary circuit, and performing differential comparison with a healthy impedance benchmark profile to generate a virtual connection sensitive residual spectrum; backfilling the virtual connection sensitive residual spectrum into the secondary circuit topology diagnostic map to obtain a virtual connection residual topology map, and performing residual propagation positioning along the secondary circuit functional transmission direction to determine the virtual connection fault location point. This invention achieves the proactive stimulation of the secondary circuit virtual connection impedance response under controlled operational risks, improving the online identification capability of early virtual connection states.

The present application relates to the technical fields of electromagnetic variable measurement and analysis, and discloses a method and system for testing the stability of an emulsion explosive oil film. The method comprises: placing an emulsion explosive sample between a first electrode and a second electrode in a test container to obtain a target oil film, and forming an electrical contact for the target oil film; applying an alternating voltage signal to the first electrode and the second electrode to generate a polarization response; collecting dynamic response data of complex impedance with respect to an excitation frequency to obtain an impedance response data set; decoupling a virtual part capacitance component of the target oil film from the impedance response data set, and constructing a virtual part capacitance frequency response map with the change in the excitation frequency as the horizontal axis and the virtual part capacitance component as the vertical axis; identifying a relaxation peak feature of the virtual part capacitance frequency response map to obtain an interface relaxation characteristic value; and comparing the interface relaxation characteristic value with a preset standard characteristic value to determine the stability of the target oil film. The present application can improve the efficiency of testing the stability of an emulsion explosive oil film.

The application discloses a method for separating humidity and gap response of element impedance, which comprises the following steps: sequentially plating a spiral gap single-sensitive layer, a gap single-sensitive insulating layer, a gap single-sensitive electrode layer, a lead layer, a gap humidity double-sensitive insulating layer, a gap humidity double-sensitive electrode layer and a spiral gap humidity double-sensitive layer on a substrate layer to obtain a single sensitive element capable of simultaneously responding to humidity excitation and gap excitation; when the sensitive element is simultaneously applied with humidity excitation and gap excitation, the difference between the equivalent impedance change amount between the gap humidity double-sensitive electrode layer and the lead layer and the equivalent impedance change amount between the gap single-sensitive electrode layer and the lead layer is the impedance response of the sensitive element caused by the single humidity excitation, so as to separate the humidity response and the gap response. The method for separating humidity and gap response of element impedance can not only simultaneously respond to humidity excitation and gap excitation, but also separate the responses, and has the potential for developing a humidity and gap double-sensitive probe.

This invention discloses a method for monitoring the aging of connectors in energy metering boxes based on loop impedance identification. The steps are as follows: Step S01, injecting a broadband composite excitation signal into the loop containing the connector; Step S02, synchronously capturing the reflected and transmitted signals generated at the loop interface and collecting the loop load current in real time to construct an original impedance response dataset; Step S03, identifying the chemical composition and growth thickness of the oxide layer at the contact interface; Step S04, calculating the effective contact point area density using an interface quantum tunneling effect mapping model; Step S05, calculating the bolt tightening torque retention rate using a thermomechanical deformation evolution model; Step S06, matching the oxide layer growth thickness, effective contact point area density, and bolt tightening torque retention rate with a preset health fingerprint grading standard to output a diagnostic conclusion. The beneficial effect of this invention is that it can distinguish the causes of aging and detect early aging, significantly improving the accuracy and reliability of monitoring the aging of connectors in energy metering boxes.

The present application relates to the field of power system relay protection and automation, and discloses a power distribution network fault identification and positioning method, system, device and medium, after the triggering of the fault of the power distribution network, the background noise voltage spectrum and the active input impedance spectrum of the power distribution network are collected and mutual information analysis is performed thereon to obtain a local mutual information frequency domain spectrum; the fault sensitive frequency band in the local mutual information frequency domain spectrum is searched, and a sweep excitation signal is adaptively generated in combination with the active input impedance spectrum to be injected into the power distribution network to obtain impedance response data; the spectral entropy time-varying variance of the sweep excitation signal is calculated to identify the fault type of the power distribution network; the distributed parameter transmission line model of the fault line is constructed based on the impedance response data and solved by using the virtual characteristic impedance cancellation principle to obtain the fault positioning result of the power distribution network; the problem that the existing active positioning technology ignores the value of the background noise, sweeps blindly and has low efficiency is solved.

This invention discloses a method and apparatus for analyzing the sensitivity of broadband impedance of an AC system to transmission line parameters. The method includes: establishing impedance models for the transmission line, transformer, and load in the AC system; determining the sequence node admittance matrix at each harmonic frequency based on the impedance models and the topology of the AC system; determining the equivalent impedance of the AC system at each harmonic frequency by performing Cronbach's averaging on the sequence node admittance matrix; and calculating the derivative of the equivalent impedance of the AC system with respect to the transmission line parameters to obtain the sensitivity of the AC system to the transmission line parameters. This invention quantitatively characterizes the impact of changes in line parameters on broadband impedance response by calculating the equivalent impedance of the AC system at each harmonic frequency and differentiating it with respect to the transmission line parameters, thus providing a basis for the analysis and evaluation of broadband oscillation problems.

This invention belongs to the field of bioelectrochemical detection and cell interface characterization technology, specifically relating to a real-time dynamic in-situ detection system and method for cell micro-region impedance based on scanning electrochemical microscopy. The system includes: a conductive substrate electrode, a SECM probe, a cell culture module, a multi-channel electrochemical workstation, and a control system and imaging software. By precisely scanning near the cell surface using the SECM probe, impedance response signals are acquired simultaneously with the application of alternating excitation signals, enabling real-time dynamic in-situ detection of impedance in micro-regions on the surface of living cells, achieving sub-micron spatial resolution. This invention integrates impedance detection and electrochemical detection functions, enabling label-free, non-invasive continuous monitoring during cell culture, providing a novel high-resolution, multi-parameter synchronous acquisition analytical platform for cell physiological state research, drug screening, and pathological mechanism analysis.

This application provides a multi-parameter collaborative testing and intelligent diagnosis method for integrated circuit control boards, applied in the fields of pre-diagnosis and health management technology. The method controls the test probe of a flying probe tester to form a contact interface with the pin pads, and applies a frequency sweep excitation signal to the contact interface using a piezoelectric excitation unit. During the frequency sweep, complex impedance response data is acquired and a spectral response relationship is constructed. Based on the spectral response relationship, equivalent mechanical parameter inversion is performed to obtain stiffness and damping parameters, and theoretical spectral response characteristics are generated. Effective stiffness and damping parameters are screened by comparing the theoretical spectral response characteristics with actual measured characteristics. Furthermore, the type of solder joint is identified based on the deviation relationship between stiffness and damping, and solder joint evaluation parameters are constructed. The diagnostic results of the integrated circuit control board are output by combining the solder joint type and the solder joint evaluation parameters, thereby achieving multi-parameter collaborative analysis of the soldering state and graded diagnosis of solder joint defects.

The present application relates to a kind of experimental apparatus for the impedance characteristic study of flexible flaw detection sensor, belong to sensing technology field.The experimental apparatus includes bearing module, regulation and control module and acquisition module.Bearing module is composed of fixed bearing unit and movable bearing unit;Regulation and control module is composed of two-dimensional moving platform and its controller;Acquisition module is composed of impedance analyzer and microprocessor.Flexible flaw detection sensor is placed on fixed bearing unit, target object is placed on movable bearing unit, two-dimensional moving platform parameters are set using controller, movable bearing unit is controlled to move to change the relative position between flexible flaw detection sensor and defect in target object, and the impedance value of flexible flaw detection sensor is recorded by impedance analyzer and collected in microprocessor.The experimental apparatus designed in the present application can obtain the impedance response data of flexible flaw detection sensor for different positions and shape defects in target object, and provides experimental environment and conditions for performance research and prototype development of flexible flaw detection sensor.

This invention discloses a method, device, and storage medium for quantifying the size characteristics of surface and near-surface microcrack defects in conductive components, belonging to the field of electromagnetic nondestructive testing and evaluation technology. The method is based on the eddy current impedance response signal, introducing Jensen-Shannon divergence and Wasserstein distance from information theory to characterize defects by measuring the overall "distance" from the probability distribution of a defect-free reference signal. Based on the mapping relationship between these characteristic quantities and crack defect size parameters, a quantitative model of microcrack defect size characteristics is established, enabling quantitative evaluation of the size of surface and near-surface microcrack defects in conductive components. This method is applicable to the quantitative characterization of surface and near-surface microcrack defects in conductive components, especially metallic components, after eddy current nondestructive testing. Conductive components include, but are not limited to, key components of aero-engines, aircraft structural components, key structural components of nuclear power pressure vessels, and key load-bearing components of automobiles.

This application relates to the field of fuel cell technology, and particularly to a local electrochemical impedance spectroscopy (FET) testing system and method for fuel cells. The method includes: acquiring the total input current of the test object under preset test conditions, as well as voltage and current time-domain data for multiple zones within the target membrane electrode area; correcting the voltage time-domain data according to a preset equivalent contact resistance value to obtain corrected voltage time-domain data; converting the corrected voltage and current time-domain data to the frequency domain to extract the amplitude and phase of the current and voltage in multiple zones, generating FET test results for multiple zones. This application can effectively eliminate the influence of contact voltage drop on local voltage readings in the measurement circuit, significantly improving the authenticity and comparability of local impedance data. Simultaneously, through a parallel impedance inversion verification method, a quantitative correlation is established between local impedance measurement and overall impedance response, enhancing the physical reliability of the test results.