138 results about "Impedance network" patented technology

The invention discloses a stability analysis method of a network tracking / constructing hybrid station based on an impedance model, and relates to a modeling and stability evaluation technology of a wind power plant grid-connected system. The method comprises the following steps: firstly, respectively establishing sequence impedance models of a following network type direct-driven fan and a construction network type direct-driven fan based on a harmonic linearization method, and verifying the accuracy of the established models in different frequency bands by combining an impedance sweep frequency method; secondly, on the basis of considering the influence of line impedance, deducing to form an impedance network structure of a hybrid wind power plant grid-connected system, and constructing a stability judgment condition suitable for system analysis; and finally, based on the established impedance stability criterion, identifying possible oscillation risks of the system in subsynchronous and supersynchronous frequency bands. The method is suitable for wind power system stability analysis in various hybrid access scenes, and provides theoretical basis and technical support for subsequent system parameter setting, control strategy optimization and oscillation suppression measures.

The invention discloses an electrical safety test data analysis method and system for an electrical cabinet, and relates to the technical field of electrical measurement and test. The method is used for solving the problems of single test dimension, poor anti-interference capability and inaccurate fault positioning in the safety test of the electrical cabinet. Firstly, multi-channel electrical parameter synchronous acquisition is triggered based on a working condition event, real discharge and interference signals are distinguished through time-frequency analysis, and a time sequence incidence matrix of discharge pulses and load currents is established; then, analyzing phase distribution characteristics of partial discharge, calculating a correlation coefficient between a discharge repetition rate and a load current, and dynamically adjusting a weight to generate an insulation state comprehensive test index; further, insulation degradation characteristics are extracted through signal decomposition, and an insulation degradation trend and a fault probability are predicted in combination with energy entropy analysis and discharge mode recognition; and finally, the position of a fault component is analyzed and positioned based on the impedance network, and a maintenance priority sequence is generated according to the fault probability and the degradation rate.

Various embodiments disclosed by the present invention include an exemplary system for remotely testing the continuity of electrical wiring, an electric vehicle charging system, and a charge coupler for an electric vehicle charging system. In an exemplary embodiment, the system for remotely testing the continuity of electrical wiring includes a signal generator configured to generate a signal having a predetermined frequency. A controlled impedance network is configured to attenuate the signal. The controlled impedance network can be electrically connected towards a first end of the electrical wiring, which is terminated at a terminal at the first end and can be electrically connected to the signal generator at a second end to carry the signal. A signal detector is configured to detect the signal.

The invention discloses a common-mode electromagnetic interference modeling and suppression method for a matrix converter, and the method comprehensively considers high-frequency parameters and topological characteristics, builds a conduction CM EMI equivalent circuit model of the matrix converter, completes the impedance network fitting of key elements and the extraction of high-frequency parasitic parameters, and achieves the modeling and suppression of the common-mode electromagnetic interference of the matrix converter. The precision of the CM EMI model of the matrix converter is improved, and the analysis of the CM EMI characteristics of the matrix converter is simplified. According to the common-mode electromagnetic interference suppression method for the matrix converter, CM EMI characteristics of the matrix converter are analyzed, a low-attenuation loop in the converter is constructed by adopting a method of combining a neutral line leading-back type structure and increasing output filter capacitor neutral-point-to-ground parasitic capacitance, the propagation proportion of noise in a linear impedance stabilization network measurement branch is reduced, and the measurement accuracy of the common-mode electromagnetic interference suppression method for the matrix converter is improved. And effective suppression of low-cost CM EMI noise is realized on the premise of not depending on an input EMI filter.

The invention discloses an energy storage power station oscillation risk monitoring method and device based on impedance network aggregation, and belongs to the field of power systems, and the method comprises the steps: obtaining impedance information and a first network topology structure of each device in an energy storage power station; obtaining a first impedance network framework by adopting a hierarchical calculation method; based on the framework and the impedance information, an impedance network aggregation method is adopted to calculate impedance characteristics of all frequency points to form full-frequency-domain impedance characteristics, and the oscillation risk of the energy storage power station is monitored according to the full-frequency-domain impedance characteristics and actual impedance data. The problem that it is difficult to accurately monitor the oscillation risk of the energy storage power station while guaranteeing the calculation efficiency in the prior art can be solved.

The present invention provides a grid simulator and a test device for the stability test of a grid-connected converter. Among them: The voltage-controlled converter uses a virtual impedance controller and a voltage controller to achieve the port voltage characteristics of the simulated grid, and the voltage-controlled converter has a relatively high switching frequency; the current-controlled converter uses a transient current controller and a current controller to absorb or generate the port load current of the simulated grid, and the current-controlled converter has a relatively low switching frequency; the AC sides of the two converters are connected in parallel and directly connected to the port of the simulated grid, or connected to the port of the simulated grid through a resistor-impedance network. The virtual impedance controller eliminates the differential operator through the Norton equivalent circuit and accurately reproduces the port impedance characteristics of the grid. The present invention can effectively simulate and shape the grid impedance characteristics in a wide frequency band, so as to conveniently realize the stability test of the grid-connected inverter under different grid impedance conditions.

The invention relates to the technical field of electromagnetic environment simulation, in particular to a conducted disturbance and immunity comprehensive test system in a complex electromagnetic environment, which comprises a signal generation module, a holographic electromagnetic wave processing module, a conduction path simulation module, a monitoring and analysis module and a control and management module. Through AI dynamic optimization and a programmable metasurface technology, real-time regulation and control of phased array excitation weight and electromagnetic wave front are realized, through combination of digital twin pre-calculation and multi-physics field coupling modeling, spatial characteristics and interference propagation paths of a complex electromagnetic environment can be efficiently and accurately simulated, authenticity and reliability of testing are improved, and the method is suitable for large-scale popularization and application. A high-precision conduction path model can be constructed by utilizing a programmable impedance network and a modular configuration architecture in combination with a non-intrusive interference injection and data driving optimization technology, an electromagnetic conduction environment is vividly simulated, and a reliable environment basis is provided for testing.

The invention discloses an ultrasonic power supply impedance network, a variable inductor, a control circuit and a control method. The variable inductor, the ultrasonic power supply impedance network and the control circuit are included. The variable inductor is composed of a main magnetic core, two auxiliary magnetic cores, a main winding and an auxiliary winding, and air gaps are formed between the auxiliary magnetic cores and the main magnetic core. The magnetic saturation degree of the auxiliary magnetic core is changed by adjusting the control current, then the magnetic saturation state of the main magnetic core is changed, and dynamic change of the inductance value is achieved. The ultrasonic power supply load is capacitive, the control circuit can enable the load impedance and the variable inductor to reach a resonance state, the loss is effectively reduced, and the energy transmission efficiency is improved. Besides, according to the impedance matching method, the two auxiliary inductors are utilized, the impedance matching speed is improved through coarse adjustment, the impedance matching precision is improved through fine adjustment, the impedance matching method has the advantages of being high in matching precision, wide in matching range, capable of being dynamically adjusted and the like, and the application field of the variable inductor is further expanded.

The invention relates to the technical field of power systems, and discloses a multi-level direct current sending end small disturbance stability assessment method, device and equipment and a medium. Carrying out frequency domain impedance modeling on the following network type new energy converter, the constructed network type energy storage converter, the following network type load converter and the modularized multi-level high-voltage direct current converter station, and constructing a frequency domain impedance network of the all-electric system based on an equivalent impedance model of each device; and performing small disturbance stability analysis on the frequency domain impedance network by using a generalized Nyquist stability criterion, and determining the small disturbance stability of the all-electric system in an alternating current and direct current hybrid scene through a Nyquist diagram of impedance ratios of two sides of a voltage source and a current source in the frequency domain impedance network. Therefore, an effective evaluation means is provided for stable operation of the alternating-current and direct-current series-parallel all-electric system.

The present disclosure provides an apparatus and method of discriminating a phase of reflected waves. The apparatus includes a sensing impedance circuit disposed between a signal source and a load and having a variable sensing impedance, a directional coupler disposed between the signal source and the sensing impedance network, and a controller configured to detect intensities of an input signal transmitted from the signal source to the load and a reflected signal reflected from the load, determine a magnitude of the reflection coefficient based on the intensities of the signals, determine a difference in the magnitude of the reflection coefficient based on a plurality of magnitudes of the reflection coefficients obtained with respect to different sensing impedances, discriminate a range of the phase of the reflected waves based on the difference in the magnitude of the reflection coefficient, and control the sensing impedance network to change the sensing impedance.

The invention provides a novel high-gain DC-DC converter based on a photovoltaic panel and a DC bus, and relates to the technical field of power electronics and control thereof. Comprising an input stage of a conventional SEPIC converter; the boosting unit is composed of an impedance network and a switched capacitor network, the impedance network comprises external inductors connected in series and capacitors and diodes connected in series with the external inductors, and the impedance characteristic of the input side is adjusted through the combination of the capacitors, the diodes and the inductors; the switched capacitor network comprises a capacitor and a diode which are connected in series, and charge transfer and voltage multiplication are achieved through charging and discharging of the capacitor and unilateral conductivity of the diode. The load unit realizes voltage conversion and stable output through the synergistic effect of an impedance network and a switched capacitor network in the boost unit.

The invention relates to an incremental learning CNN-Attention-based broadband impedance on-line identification method for a network construction type wind power plant, and belongs to the technical field of new energy grid connection, and the method comprises the following steps: S1, building a parallel collection type offshore wind power plant multi-machine dynamic equivalent model; s2, collecting and preprocessing parameters based on a multi-machine equivalent model of the network-building type wind power plant; s3, a CNN-Attention model is constructed and trained; s4, constructing an equivalent impedance model of the current collection submarine cable line between the wind turbine generators; s5, on the basis of the actual topology of the network construction type wind power plant station, connecting the broadband impedance models of the wind turbine generator and the current collection circuit into a frequency domain impedance network, and calculating the impedance characteristics of the current collection port of the multi-machine equivalent wind power plant; s6, a CNN-Attention model containing an incremental learning updating mechanism is constructed; and S7, performing broadband impedance on-line identification on the network construction type wind power plant.

An assembly of electronic components for reception of data using an optical fibre wherein said assembly comprises: a photodiode; a first amplifier coupled to said photodiode; a second amplifier, whose electrical behaviour is substantially identical to an electrical behaviour of said first amplifier; an impedance network comprising at least two electronic components coupled between an input of said second amplifier and a reference terminal, wherein those at least two electronic components comprise at least two impedance elements, one impedance element being capacitive and another being resistive or inductive, and wherein said at least two electronic components are adjustable under electronic control to adjust the impedance presented by said impedance network; and circuitry for creating a signal formed from a subtraction of outputs of the first and second amplifiers.

The utility model relates to a communication circuit and a scooter. According to the communication circuit, a first withstand voltage boosting module comprises a withstand voltage controllable switching device and is used for being switched on or switched off under the control of a bias signal; data transmission between the first data port and the second data port is opened or closed, and the withstand voltage values of the first data port and the second data port are increased to a first voltage threshold value; the second withstand voltage boosting module comprises a withstand voltage unidirectional switching device and is used for sending a clock signal from the master device to the slave device and increasing the withstand voltage values of the first clock port and the second clock port to a second voltage threshold; the first response speed increasing module comprises a first impedance network and is used for increasing the level change rate of the first data port and the first clock port; and the second response speed increasing module comprises a second impedance network and is used for increasing the level change rate of the second data port and the second clock port. According to the I2C communication port provided by the embodiment of the invention, 100V voltage resistance can be realized, and the response speed is at a microsecond level.

The invention discloses a power station arc discharge data acquisition control method, which comprises the following steps of: after equipment is electrified, carrying out equipment self-inspection to ensure that each piece of equipment in a system can operate normally and the equipment is accurately positioned when the equipment is abnormal, and ensuring that the abnormal equipment is quickly positioned and repaired; by automatically matching an actual data acquisition scene according to the current environment, the data acquisition efficiency and accuracy are improved, meanwhile, in order to protect equipment, a time interval is increased when an impedance network is set, and due to the increase of the time, secondary scene information checking is added for the accuracy of an arc discharge data scene label, so that the accuracy of the arc discharge data scene label is improved. Data is matched with scene information as much as possible; scene configuration information is obtained in real time before execution each time, and the scene configuration information is synchronously updated to a scene configuration file after data acquisition is completed; it is ensured that data cannot be collected repeatedly when execution is started next time if the data collection is abnormal midway or manually interrupted, errors possibly caused by manual intervention are reduced, and the use threshold of a control system is lowered.

To provide a flicker value calculation and power supply harmonic analysis device capable of estimating flicker values and power supply harmonic analysis results compliant with required standards while being connected to a commercial power supply.SOLUTION: A processor is configured to store a measured voltage and measured waveform thereof in a memory, extract voltage and current waveforms within a predetermined time range from the measured voltage and measured waveform thereof stored in the memory, perform a standard-compliant power supply harmonic calculation current conversion for converting the extracted voltage and current waveforms into voltage and current waveforms when connected to a power supply compliant with predetermined standards, analyze the power supply harmonic current from the converted current waveform, perform a standard-compliant flicker value calculation voltage conversion for converting the extracted voltage and current waveforms into voltage and current waveforms when connected to a power supply compliant with predetermined standards and a reference impedance network, calculate a flicker value from the converted voltage waveform, and output results of the power supply harmonic analysis and the calculated flicker value to an output interface.SELECTED DRAWING: Figure 1

The invention discloses a novel power saving system, which relates to the technical field of power saving, and is characterized by comprising a special multi-winding transformer T1, power electronic equipment and a capacitor, the special multi-winding transformer T1 is electrically connected with the power electronic equipment and the capacitor; the specially-made multi-winding transformer T1 comprises two windings; the secondary side of one winding is electrically connected with the power electronic equipment, provides a channel for the control voltage and is used for controlling the output voltage; and the other winding is electrically connected with the capacitor to provide a channel for controlling the impedance network to form the impedance network to be connected with the load in parallel. The technical problem to be solved by the invention is to provide a novel power-saving system, which combines an electromagnetic balance principle and a power electronic technology, realizes the function of simultaneously controlling output voltage and load impedance network balance in real time through a specially-made multi-winding transformer, further improves the energy-saving space, and also solves the problem of power interference of a power supply at the same time.

The application discloses a charged water body equivalent impedance model construction and parameter acquisition method and related devices, and innovatively establishes a calculation system containing resistance and inductance correction factors, and realizes high-precision characterization of water body impedance characteristics by introducing an electrode spacing function. Specifically, a scalable grid technology is used to construct an adaptive calculation framework, and the calculation accuracy of resistance and inductance parameters is significantly improved through a power function correction algorithm. A reliable numerical calculation is provided for water body impedance network model analysis in complex hydrological environments. The application solves the problems of the prior art, such as complex modeling process, difficulty in accurately describing nonlinear behavior, insufficient precision, and inability to accurately capture the real behavior of water body.

The application discloses a power converter, a power supply system, a control method and related devices. The power converter comprises an impedance network and a three-phase power conversion circuit, each phase of the three-phase power conversion circuit comprising a four-switch Buck-Boost circuit; the DC side of the three-phase power conversion circuit is used for connecting a DC source, and the AC side of the three-phase power conversion circuit is used for connecting a load or a power grid; wherein the load adopts star connection, and the power grid adopts star connection; the first end of the impedance network is connected to the positive pole of the DC side of the three-phase power conversion circuit, and the second end of the impedance network is used for connecting the neutral point of the load or the neutral point of the power grid. In the embodiment of the application, in the case that the power converter is switched from three-phase three-wire system to three-phase four-wire system, the impedance network is connected between the N line (the DC side of the three-phase power conversion circuit and the neutral point of the load or the neutral point of the power grid), the inrush current on the N line is reduced, and the risk of damage of the switching device in the power converter is reduced.

The present application discloses an electromagnetic compatibility testing method, system, device, and medium for an on-board charger. The method includes: upon receiving a compatibility test instruction, a control signal generating device generates a control pilot signal to control an AC power source to charge a sample under test through the control pilot signal; an AC line impedance network includes multiple test ports; test configuration parameters of a test receiver are obtained; when each of the multiple test ports of the AC line impedance network is connected to a test receiver, the test receiver is controlled to measure the conducted emission of the phase line corresponding to the test port according to the test configuration parameters to obtain measurement results for each test port; and the measurement results for each test port are analyzed to obtain test results. This technical solution can simulate the conducted interference test results at the vehicle level through the component-level on-board charger test method, shortening the test development cycle and improving the efficiency of electromagnetic compatibility testing.

The invention belongs to the technical field of integrated circuit design, and particularly discloses a low-delay sampler structure and method for high-speed data processing, and in a pseudo reset stage, an unlocking network module and a pre-latching network module are connected in parallel to form an equivalent low-impedance network unit; the transconductance module is used for inputting a sampling signal and a reference level signal and driving the equivalent low-impedance network unit; the pre-latch network module is used for enabling an output node of the pre-latch network module to start charging and discharging according to a sampling signal and a reference level signal and pre-sampling the sampling signal; meanwhile, in the latching stage, the transconductance module is used for driving the pre-latching network module to preliminarily amplify the sampling signal, and the strong latching network module is used for stably latching the sampling signal under the driving of the pre-latching network module. According to the invention, the sampling delay of the signal is obviously shortened, and meanwhile, the requirement of high-speed data processing on the time sequence progress is met.

The invention provides a high-stability control method for a power grid simulator, and the method comprises the steps: embedding a virtual impedance feature Zvirref (s) in an integral controller of a voltage controller module, and forming a controller structure of Ki * Zvirref (s) / s; and dynamically adjusting the integral gain Ki according to the virtual impedance generated by the power grid simulator and the physical impedance provided by the impedance network B so as to meet the condition that the amplitude of the virtual impedance is not higher than the amplitude of the physical impedance in the frequency range in which the virtual impedance is presented to be non-passive. Decoupling between internal control dynamic and virtual impedance characteristics of the power grid simulator is realized, and the self-stability of the power grid simulator under different impedance simulation conditions is ensured; the self-adaptive adjustment of the closed-loop transfer function of the power grid simulator is realized, the virtual impedance and the physical impedance are ensured to meet the Nyquist stability criterion, and the interaction stability between the power grid simulator and the tested object is improved.

An oscillator includes first and second comparators, a first impedance network having a first trim element therein, and a second impedance network having a second trim element therein. The first impedance network is electrically connected to a first input terminal of the first comparator, and the second impedance network is electrically connected to a first input terminal of the second comparator. The first and second impedance networks are configured to cause an improvement in common mode variation within the first and second comparators, in response to trimming of at least one of the first and second trim elements.

The present application relates to the technical field of probe card signal optimization, in particular to a high-frequency probe card signal optimization method based on dynamic impedance matching and related devices. The method steps include: obtaining real-time high-frequency signal reflection parameters of the probe card test channel to provide real-time detection basis for dynamic impedance matching. The present application relies on the real-time acquisition of the high-frequency signal reflection parameters of the probe card test channel to complete the quantitative tracing of the dynamic impedance deviation, and through the closed-loop feedback adjustment, the integrated adjustable impedance network of the driving probe is used to complete the real-time correction of the output impedance. From the root level of transmission line impedance matching, the present application breaks through the inherent limitation of the traditional static matching scheme which can only adapt to the nominal working condition, and can effectively offset the dynamic impedance mismatch introduced by the contact state difference, the probe structure micro-deformation, the device individual parasitic parameter dispersion and the nonlinear evolution of the parasitic parameters under high frequency in the actual test process, and solves the reflection residual problem that cannot be eliminated by static matching.

A grounding impedance measurement apparatus and method, and an inverter are provided. The measurement apparatus includes a signal source, a coupling impedance network, a voltage division network, a sampling module, and a controller, the coupling impedance network is connected to the signal source, and couples an excitation signal between a direct-current input terminal and an alternating-current output terminal of an inverter; the voltage division network performs voltage division on the voltage between the direct-current input terminal and the alternating-current output terminal to provide a divided voltage; the sampling module is connected to the voltage division network, samples the divided voltage, and acquires a sampled voltage; and the controller is connected to the signal source and the sampling module, respectively, and acquires a grounding impedance of the direct-current input terminal of the inverter.

The application belongs to the technical field of wireless communication, and discloses a backscattering communication method, device and system based on multi-carrier differential modulation t The transmission vector at t-1 time is expanded into a symmetric and full-rank subcarrier block transmission matrix, the transmission vector u t is subjected to rectangular differential modulation to obtain the transmission vector at t time, and then is converted into a time-domain data frame and mapped into a reflection coefficient; and the excitation source signal is modulated by means of an impedance network to generate a backscattering signal. Since differential modulation transmits information based on the difference between adjacent symbols, the channel state information is cancelled in the process of data detection at the receiving end, and the original sending data can be recovered by non-coherent detection of the receiving signal at the receiving end, without a complex cascaded channel estimation process, so that the complexity of the multi-carrier backscattering communication system is effectively reduced.

The invention relates to a neutral electrode heat effect test system, a temperature rise characteristic test method and a cooling characteristic test method. The neutral electrode heat effect test system comprises an upper computer for generating a test configuration instruction; the central control module is connected with the upper computer and interacts data; each electronic skin module comprises a skin contact surface, a human body skin impedance network capable of simulating skin impedance of different crowds, a temperature measurement feedback device for collecting temperature and a heating device; the high-frequency variable-frequency constant-current source module outputs high-frequency constant current to enable the neutral electrode and the impedance network to generate heat; the central control module receives the temperature parameters and / or the constant current output parameters and uploads the temperature parameters and / or the constant current output parameters to the upper computer. According to the invention, the heat effect test of the neutral electrode can be effectively realized.

The invention discloses an impedance source inverter with a non-isolated half-bridge structure. The impedance source inverter comprises a direct-current power supply, a high-gain Y-source impedance network, a half-bridge network, a signal conditioning circuit, an optocoupler isolation driving circuit and a load, the input end of the high-gain Y-source impedance network is connected with a direct-current power supply to realize a function of increasing the output voltage of the direct-current power supply; the input end of the half-bridge network is connected with the output end of the Y-source impedance network, so that the function of converting direct current output by the Y-source impedance network into alternating current is realized; the signal conditioning circuit generates a control signal and realizes driving control on the power MOSFET device through the optical coupling isolation driving circuit; a power electronic conversion technology based on a non-isolated half-bridge structure impedance source network is adopted, direct current of a direct-current power supply is converted into alternating current, the number of capacitor high-voltage stress devices and needed devices is reduced, better response and control capacity is achieved when high-frequency signals are processed, and especially in high-power application, the power electronic conversion device has a good application prospect. And the conversion efficiency can be obviously improved.

The invention relates to the technical field of bioelectrical impedance testers, in particular to a calibration device of a bioelectrical impedance tester and a calibration method thereof. According to the technical scheme, the calibration device of the bioelectrical impedance tester is connected with a host of the bioelectrical impedance tester through a communication interface and a calibration port, and comprises a main control unit used for communicating with the host of the tester and analyzing an instruction from the host; the control end of the high-speed multiplexer is connected with the main control unit, and the output end of the high-speed multiplexer is connected to the calibration port; the standard impedance network is composed of a plurality of high-precision passive elements and comprises resistors, capacitors, inductors and series-parallel combinations of the resistors, the capacitors and the inductors, and the impedance elements are connected to different input channels of the high-speed multiplexer respectively. Through a highly integrated standard impedance network and an automatic switching mechanism, full automation of a calibration process is realized, manual errors are thoroughly eliminated, and calibration efficiency and consistency are greatly improved.

The present invention relates to the field of electronic materials, specifically to an aircraft de-icing / electromagnetic low-scattering compatible structure and a design method thereof. The present invention adopts a periodic high-wave-transmittance electric heating impedance network, conforms the impedance network to the wave-absorbing structure, and realizes high-wave-transmittance performance through patterned design of the impedance network; and by optimizing the key ice formation areas on the surface of the wave-absorbing structure to perform resistance control in partitioned areas, the purpose of zoned heating and concentrated heat adjustment is achieved, thereby achieving more targeted de-icing. The present invention can simultaneously realize the functions of electric heating de-icing and electromagnetic low-scattering, which can not only meet the needs of aircraft de-icing at high altitude or in cold environments, thereby protecting the flight safety of the aircraft, but also ensure that the aircraft's electromagnetic low-scattering function is not affected. It is expected to be applied to the safety protection and electromagnetic compatibility of future low-detectable aircraft, and become its important technical accumulation.