168 results about "Branch current" patented technology

The invention relates to the technical field of electric energy conversion control, and discloses a multi-source load auxiliary power supply power balance control system, which comprises a sampling module, a control module and a modulation module, the sampling module obtains parallel converter branch current and direct current bus voltage; the control module determines a weight by utilizing physical associated association of a bus voltage change gradient and branch current change polarity, corrects a dynamic slope factor determined by a current change rate according to the weight, and performs upper limit clamping on the dynamic slope factor according to a bus voltage margin; according to the invention, the rigid restriction of droop control logic is eliminated, the power deviation generated by asymmetry of feeder impedance is automatically offset while the bus voltage stabilization precision is maintained, and the convergence speed and the certainty of the system during violent load switching are improved.

The invention discloses a high-voltage discharge circuit suitable for a storage battery power supply and an electric flame stove. The high-voltage discharge circuit comprises an inversion driving module, a boosting transformer T1, at least three groups of active bridge rectifier modules and discharge modules corresponding to the active bridge rectifier modules. Through combination of driving of the active bridge rectifier module, voltage / current double-closed-loop feedback and real-time PWM signal output control of the control chip U1, current difference of each discharge branch is eliminated, the problem of uneven branch current is solved, and ring current and reactive power loss between branches are eliminated; a diode in a voltage doubling rectifying circuit and a bleeder resistor of a resonance circuit in the prior art are abandoned, an active bridge type rectifying module is adopted for driving, a PWM signal is dynamically adjusted through the low ESR characteristic of a capacitor C1 and closed-loop control, extra power loss is avoided, the working temperature of the circuit is controlled to be below 85 DEG C, and the service life of the circuit is prolonged. And the continuous service life of components in the circuit is prolonged.

The invention relates to a current switching-on and switching-off converter which comprises a shell barrel, a plurality of limiting rings and a plurality of wires, a shell cavity is formed in the shell barrel, the limiting rings are contained in the shell cavity, limiting holes and conductive springs are arranged in the limiting rings, the limiting holes are communicated with guide holes, the conductive springs surround the limiting holes, one ends of the wires are electrically connected with the conductive springs, and the other ends of the wires are electrically connected with the conductive springs. And the other end of the lead extends out of the shell cylinder. By adopting the technical scheme provided by the invention, when the number of branch currents is more, the wires are not limited to be arranged in the same plane any more, the reduction of the appearance size of the electric connector is facilitated, and the electric connector can be assembled and applied in a narrow space range; when the electric connector provided by the invention is plugged with other electric connectors, the rigid surfaces of the conductive parts are in contact with the flexible surfaces of the conductive springs, so that good electrical contact between the electric connectors can be ensured, and the reliability of electrical connection is ensured.

A converter station AC filter group circuit breaker abnormal arcing modeling analysis method comprises the following steps: firstly, carrying out time mark alignment, amplitude calibration and filtering de-noising on wave recording signals such as AC bus voltage and filter branch current to obtain high-quality input data; then, combining a primary wiring diagram, enabling an alternating current system to be equivalent to an ideal power supply and series impedance, enabling circuit breaker arcing to be equivalent to arc resistance changing along with time, and constructing an equivalent circuit model comprising the power supply, the impedance, a capacitor, an electric reactor and dynamic arc resistance; establishing a state space equation according to a voltage and current constraint relation, and performing time domain solution by adopting a two-step two-order or three-order diagonal implicit Runge-Kutta method to obtain voltage and current responses of the whole process of the fault; on this basis, the arc resistance change is inversed according to the ratio of arc voltage to current, the current zero passage is identified through the resistance symbol change at adjacent moments, and the zero passage section is smoothed; and finally, the inversion result is verified again by means of the simplified equivalent model.

The invention relates to the technical field of power grid safety evaluation, in particular to a power system short-circuit parameter prediction method, system and device based on time-space relevance and a storage medium. A multi-dimensional state vector including a node voltage vector, a branch current vector, a short-circuit impedance matrix, spatial position information and a time feature vector is constructed, and a space-time correlation feature vector including a time-dimensional feature, a spatial-dimensional feature, a space-time coupling feature and a state feature is extracted. Wavelet transform, Fourier analysis and graph theory analysis are adopted to identify a parameter change rule and a propagation effect. A multi-level prediction model of a statistical prediction layer, a deep learning layer and a fusion layer is constructed, and comprehensive description of dynamic characteristics of short-circuit parameters is realized through spatio-temporal feature fusion. A staged training strategy is adopted, and comprises the steps of establishing a basic model through offline training, updating parameters in real time through online learning, and quantifying uncertainty through a probability prediction framework. And a prediction correction mechanism and a reliability evaluation system are established, and a complete prediction-evaluation-correction closed loop is formed.

The invention discloses an electric power system wiring detection method based on block parallel processing, and relates to the field of current detection, and the method comprises the steps: collecting real-time operation data through a sensor disposed at a key node, and constructing a basic data set after Kalman filtering denoising and normalization processing; establishing a sub-block identification system based on topological structure blocks, and extracting electrical and topological feature vectors; a master-slave parallel computing architecture is adopted, a master node allocates tasks according to priorities, and an improved random forest model is utilized to perform sub-block level anomaly preliminary screening; cross-sub-block collaborative verification is realized by verifying the boundary interconnection switch state, the branch current and the bus voltage; and finally, constructing a global wiring state map to perform difference analysis, accurately positioning abnormal equipment and types, and verifying a result through high-precision retest. The method has the advantages that the efficiency is improved through scientific partitioning and distributed parallel computing, the accuracy is guaranteed in combination with multi-dimensional detection, boundary verification and a retest mechanism, wiring abnormity is efficiently positioned, and reliable support is provided.

The invention belongs to the technical field of power protection, and particularly relates to a station transformer grounding current synchronous synthesis method and system, and the method comprises the steps: carrying out the grouping according to the number of a station transformer, synchronously collecting the grounding branch current of each station transformer to obtain an original signal, carrying out the double identification, and carrying out the homologous copying; generating two paths of independent signals of frequency detection and phase calibration; frequency detection signals are grouped according to double identifications, the independent actual frequency of each station transformer is obtained after frequency detection processing, and a same-frequency sine dynamic reference signal is generated based on the independent actual frequency; performing phase alignment and compensation on the phase calibration signal and the corresponding reference signal according to the double identifiers to obtain a calibrated signal; according to the method, the phase calibration reference of each station transformer is completely matched with the actual frequency of the station transformer, the reason of phase reference dislocation caused by frequency fluctuation is eliminated from the source, and the accuracy of synthesizing the total grounding current in the station is improved.

The invention discloses a synchronous generator rotor turn-to-turn fault online monitoring method and system, and the method comprises the steps: building a time-varying parameter mathematical model which comprises a stator branch, a normal excitation loop, an excitation fault additional loop, a damping loop and a load based on a multi-loop theory, and collecting the current signals and key-phase signals of all parallel branches of a stator in real time; the fractional harmonic characteristic quantity representing the fault is extracted through analysis, and whether turn-to-turn short circuit occurs or not is judged according to a preset criterion; and if the fault is determined, determining the position of the fault magnetic pole by adopting a phase matching algorithm in combination with the key-phase signal and the magnetic pole fault characteristic angle database. According to the method, the primary side of the generator does not need to be transformed, high-sensitivity online monitoring and accurate positioning of rotor turn-to-turn faults in operation can be achieved, and the method is suitable for safety guarantee of an active-service unit.

The invention relates to the technical field of electromagnetic transient simulation, in particular to an electromagnetic transient simulation decoupling method, system and device based on a single-impedance branch and a medium, and the method comprises the steps: dividing a system to be simulated into two subsystems which are connected through the single-impedance branch, and carrying out the equivalent reconstruction to form a reconstructed branch model; establishing a discrete state space equation based on the reconstructed branch model; according to the main step length, the number of sub-steps meeting the stability condition is determined based on a small-step synthesis algorithm, and the main step length is equally divided into differential step lengths; in each main step length interval, performing iterative calculation on the state-space equation by using a differential step length to obtain a branch current and a capacitor voltage at the next moment; and injecting the calculated branch current serving as a known current source into an original network equation, solving in parallel to obtain the port voltage of the subsystem, and completing decoupling calculation and promoting simulation. According to the method, effective decoupling of the universal single-impedance branch can be realized, and the applicability, the numerical stability and the calculation efficiency of parallel simulation are improved.

The invention relates to the technical field of fault detection, in particular to a generator stator winding turn-to-turn short circuit detection method and system, and the method comprises the steps: synchronously collecting stator branch current, an air-gap magnetic field and an engine base vibration signal; preprocessing the signal and standardizing the working condition; extracting and adaptively fusing three types of feature vectors of branch current circulation, magnetic field asymmetry and vibration feature spectrum correlation to generate a comprehensive fault feature vector; inputting the short-circuit fault into a trained turn-to-turn short-circuit intelligent classifier, and outputting a fault judgment result and a continuous short-circuit fault confidence coefficient index; and finally, combining a confidence index trend and a feature contribution degree backtracking analysis result to generate a comprehensive state evaluation report. According to the invention, high-sensitivity and high-reliability online detection and early warning of early weak turn-to-turn short circuit are realized.

The invention discloses an open circuit diagnosis method, an open circuit diagnosis device, an energy storage system and a vehicle, and belongs to the technical field of energy storage. The open circuit diagnosis method comprises the following steps: judging whether an open circuit fault occurs in n branches or not; and when the open circuit fault occurs in the n branches, determining the shunt current in each branch, and if the shunt current is less than or equal to the first target current, judging that the corresponding branch is open circuit. According to the open circuit diagnosis method provided by the invention, the problems of fault false alarm and the like caused by circulation between the branches due to the differential pressure can be effectively solved, the open circuit state of each branch can be diagnosed, and the after-sales maintenance efficiency can be improved.

The invention discloses a distributed photovoltaic-containing power distribution network planning layer multi-objective optimization method, which comprises the following steps of: constructing a multi-objective optimization model taking investment cost, network loss and voltage deviation as sub-objectives, and integrating the sub-objectives into a unified optimization function through a weight coefficient method; multi-dimensional constraint conditions such as node voltage safety, power balance, capacity upper limit, branch current and whole network permeability are established in combination with load flow calculation, photovoltaic optimal point distribution and capacity configuration are solved by adopting an improved flower pollination algorithm, and the convergence speed and optimization precision are improved. The improved dynamic projection primal-dual distributed algorithm is adopted, and local information exchange and a self-adaptive step length mechanism are utilized, so that the real-time network loss minimization and voltage stability control of the high photovoltaic penetration power distribution network are realized, and the safety and economy of the system are ensured.

The invention discloses a cable branch box power supply system and a method thereof, the cable branch box power supply system comprises a three-section surge protection device, an integrated trigger type discharge gap unit, an MOV clamping unit and a residual voltage shaping network, and is cooperated with a follow-up cut-off mechanism to inhibit surge and optimize residual voltage in stages, cut off current at a voltage zero point when the surge is attenuated and a power frequency current exists, and improve the reliability of the power supply system. Electric arc and operation overvoltage are reduced; the on-line health diagnosis module analyzes the deterioration trend of a key element through equivalent parameter injection measurement and an NTC temperature probe, and uploads data through an RS-485 / Modbus bus; the dynamic load distribution module adjusts branch current in real time; the intelligent cooperative control module integrates multiple modules to realize self-adaptive linkage; the fault isolation unit is linked with the follow-up cutoff mechanism, and triggers cutoff and sends an opening signal to an upper level when the fault isolation unit is abnormal; and the event recording module is used for storing related data and supporting USB on-site calling. According to the invention, the surge resistance, the cutoff reliability and the operation stability of the system are enhanced, and the preventive maintenance capability is improved.

The invention discloses an optical storage integrated micro-grid management system and method, particularly relates to the technical field of hybrid energy storage power distribution control, and is used for solving the problem of high-frequency circulating current caused by dynamic response mismatch of a lithium battery and a super capacitor in the prior art. The method comprises the following steps: acquiring a micro-grid power instruction change rate and branch currents of a lithium battery and a super capacitor in real time; when the power instruction change rate exceeds a threshold value, determining a mismatch risk level according to the current internal resistance ratio; if a high risk is reached, synchronously extracting high-frequency components of two paths of current, and calculating a cross-correlation entropy of the high-frequency components through phase-space reconstruction to quantify a dynamic mismatch degree; constructing a dynamic circulating current suppression compensation function containing a cross-correlation entropy derivative damping term and an internal resistance ratio nonlinear proportional term based on the mismatch degree and the internal resistance ratio; superposing the function with an original power distribution instruction to generate a correction instruction; finally, the output of the hybrid energy storage unit is controlled through the bidirectional DC / DC converter, real-time active suppression of the dynamic circulating current is realized, the system efficiency is improved, and the service life of equipment is prolonged.

The application provides a phase-shift PWM modulation control method based on duty cycle scaling, which realizes real-time dynamic adjustment of output duty cycle by introducing a duty cycle scaling mechanism, can be used for active equalization control of branch currents in a multiple interleaved topology, makes the current and thermal stress distribution of each branch device more consistent, and thus significantly improves the overall operation stability and long-term reliability of the system. The application supports a large range of phase shift and is suitable for various high-power multiple interleaved topology structures. The application does not require an external synchronization signal and can generate double-bridge-arm driving signals only by relying on a single PWM input, which significantly reduces the system implementation complexity, simplifies the control interface and saves control resources.

The invention discloses a battery management system, a battery pack and an electric device. The battery management system comprises a first switch, a second switch, a third switch, a voltage sampling module, a first current sampling module, a second current sampling module and a processor. The first switch is electrically connected between the first sampling point and the second sampling point; the second switch is electrically connected between the anode of the first battery and the cathode of the second battery, and the anode of the second battery is electrically connected with the first sampling point; the third switch is electrically connected between the negative electrode of the second battery and the reference point; the voltage sampling module collects the voltage of the first sampling point, the voltage of the second sampling point, the voltage of the first battery and the voltage of the second battery; the first current sampling module collects main loop current; the second current sampling module collects current of a branch where the first battery is located; and the processor is used for determining whether each switch has a fault according to the sampled voltage and current. According to the embodiment of the invention, the accuracy of switch diagnosis can be improved.

The application discloses a double feedback branch current compensation type charge pump circuit, which comprises a core circuit, a double feedback branch and a bias circuit connected in sequence, wherein the input node of the double feedback branch is connected with the core circuit for detecting the potential change of the output voltage, the first output node of the first feedback branch in the double feedback branch is connected with the gate of the bias circuit, the second output node of the second feedback branch is connected with the bias circuit, and the up and down charging and discharging currents are carried out phased current compensation through the bias circuit according to the degree of the output voltage deviating from the center potential. The application solves the mismatching problem of the up and down charging and discharging currents when the output voltage deviates from the center potential through the double feedback branch, can convert the phase error output by the frequency discriminator into the difference between the charging and discharging currents, charges and discharges the loop filter to generate the control voltage of the voltage controlled oscillator, thereby realizing the lower charging and discharging current mismatching in the wider control voltage range, the smaller ripple on the output voltage, and the optimization of the jitter performance of the output clock of the phase-locked loop.

The invention relates to the technical field of energy storage configuration, in particular to a network construction type SVG super capacitor configuration method, system and device based on a direct current side direct-hanging super capacitor and a storage medium. Acquiring grid-connected voltage, target instantaneous active power and continuous discharge time; selecting the specification of a super capacitor monomer, determining a single cluster rated voltage and setting a branch current-limiting threshold value; establishing a single-cluster supercapacitor discharge model, simulating a process from constant-power discharge to a current-limiting threshold value, considering the influence of internal resistance voltage division, calculating single-cluster release energy through power-time integration, and obtaining single-cluster constant discharge power; calculating the number of super capacitor clusters; the number of parallel branches and the number of series clusters are determined by combining the topological direct-current side voltage range of the MMC, and the direct-current side rated voltage is set. By establishing a discharge model considering internal resistance voltage division, accurately calculating the actual discharge capacity of a single cluster, and systematically planning super capacitor configuration in combination with MMC topological characteristics, the problems that an existing method is insufficient in configuration precision and lack of topological adaptability are solved, and the reliability of a network-forming SVG is improved.

The application discloses a sub-threshold CMOS reference source with high power voltage rejection ratio, and relates to the field of integrated circuits.The reference source is composed of a first-stage starting circuit, a pre-stabilization circuit, a second-stage starting circuit and a core voltage reference circuit.The first-stage starting circuit and the second-stage starting circuit ensure that the circuit enters a normal working state, and the pre-stabilization circuit provides a stable and small-ripple secondary power voltage VDDs for the core voltage reference circuit.The core voltage reference circuit adopts a multi-branch current source to improve the loop phase margin, and the combination of the two can improve the low-frequency PSRR degradation problem of the sub-threshold CMOS reference source.

This application relates to a method, system, and device for calculating the DC component of short-circuit current in a power system. The method includes obtaining the fault node in the power system network topology, the number M of branches connected to the fault node, the active voltage phasor of the fault point, and the branch current phasor of each branch connected to the fault node; calculating the equivalent impedance phasor and decay time constant corresponding to each branch based on the active voltage phasor and branch current phasor; obtaining the time after the fault, and calculating the DC component of the short-circuit current based on the time after the fault, the branch current phasor, and the decay time constant; and calculating the DC component of the short-circuit current to ground of the fault node for the M branches. This method calculates the DC component of the short-circuit current of each branch connected to the fault node separately, and incorporates the decay time constant of the branch during the calculation process, resulting in more accurate calculations of the DC component of the short-circuit current of the branches.

The invention discloses a method and system for eliminating the influence of busbar structure difference on IGBT device current distribution, and relates to the technical field of IGBT devices, and the method comprises the steps: obtaining busbar structure parameters of a target busbar; selecting a chip branch from the IGBT device as a reference branch; measuring a first parameter of the busbar-reference branch pair; calculating a second parameter of the busbar-reference branch pair according to the first parameter; calculating a mutual inductance offset coefficient between the target busbar and the target IGBT device; and calculating the branch current of each chip branch in the IGBT device after the influence of the busbar is eliminated, so that the influence of the mutual inductance of the busbar on the IGBT current distribution is eliminated, the conclusion obtained by the same IGBT current distribution influence factor can be reproduced in a cross-platform manner, and a theoretical basis is provided for the research on the current equalization of the IGBT device.

The invention discloses a silicon carbide power module parallel current sharing device and an electric vertical take-off and landing aircraft, which are applied to the technical field of aviation power electronics and are used for solving the problems of poor real-time performance and reliability of the silicon carbide power module parallel current sharing device in the prior art. The method specifically comprises the following steps: a current sampling module collects branch current of each silicon carbide power module and correspondingly outputs a sampling voltage signal of each silicon carbide power module; the simulation error processing module correspondingly generates error adjusting voltage related to the current deviation of each branch through an internal hardware simulation circuit; and the gate driving adjustment module adjusts the reference ground potential of the corresponding gate driving chip according to the received error adjustment voltage. Through full-hardware and software-intervention-free simulation negative feedback closed-loop control, top-speed, automatic and self-adaptive current-sharing adjustment of the silicon carbide power modules connected in parallel is realized, and the device is insensitive to noise, so that the reliability of long-term operation is improved.

The application discloses an integrated current detection device, the integrated current detection device comprises a shunt and a Hall current sensor, the shunt comprises a diversion assembly and a connecting device, the diversion assembly comprises two wiring bodies and a voltage reduction member, and the resistance value of the voltage reduction member is greater than that of the wiring bodies. A clamping groove is formed in the wiring body, the area, where the clamping groove is formed, of the wiring body is divided into two shunting parts by the clamping groove, the sectional dimensions of the two shunting parts in the current flowing direction are set in proportion, the connecting device is used for detecting the current flowing through the diversion assembly, and the Hall current sensor detects the current flowing through the corresponding shunting parts. The overall current can be obtained by detecting the branch current, the requirement for the size of the Hall current sensor needed for detection is reduced, the use cost is effectively reduced, the shunt and the Hall current sensor are integrated, and compared with the prior art, the overall occupied space is effectively reduced, and the detection efficiency is improved. And the complexity of circuit arrangement is reduced.

Systems, devices, and methods are described to provide an improved current mirror operational transconductance amplifier (OTA). Improved OTAs may include an input circuit arranged to receive a differential voltage input, a load circuit arranged to measure a positive branch current and negative branch current from the input circuit, a bias circuit arranged to determine a bias voltage based on the negative branch current, a folded current branch circuit arranged to generate an adaptive bias current and a pass transistor configured to adjust an amount of the adaptive bias current based on the bias voltage, and a push-pull output circuit configured to sink current based on the adjusted adaptive bias current. The folded current branch circuit may generate the adaptive bias current based on the measured negative branch current. The output circuit may source current based on the measured positive branch current. Advantageously, most transistors may be of minimum size.

This invention discloses a maximum power point tracking (MPPT) control system and method for a pump-driven turbine power generation system. It calculates output power by acquiring DC-side voltage and current, and also acquires rotational speed. Within each MPPT cycle, the operating state is identified by the power-speed slope feature G: when operating conditions change rapidly, the weight of the disturbance observation branch is increased; when approaching the maximum power point, the weight of the adaptive scale fuzzy logic control branch is enhanced. The two branches achieve branch current fusion according to the weights constructed using (|G|), outputting the q-axis stator current increment. A dq current closed loop is used to output a PWM drive signal to control the machine-side converter, adjusting the electromagnetic torque of the permanent magnet synchronous generator, thereby achieving efficient MPPT under time-varying head / flow conditions. This invention relies only on measurable power and speed signals, requiring no precise hydraulic model or data-intensive training, resulting in low computational load, ease of embedded implementation, improved energy recovery efficiency, and suppression of power fluctuations and torque pulsations.

The invention discloses a low-voltage large-current electrolytic hydrogen production power supply system based on a SiC and IGBT mixed half bridge and a control method, and belongs to the technical field of electrolytic hydrogen production. The system comprises a hybrid half-bridge power module which is used for converting a bus voltage into a system total output voltage and outputting an IGBT branch current and a SiC branch current under the control of a driving signal; the driving and isolating module is connected between the digital control and sampling module and the hybrid half-bridge power module and is used for generating a driving signal according to the PWM signal and sending the driving signal to the hybrid half-bridge power module; and the digital control and sampling module is used for sampling the key state quantity of the system, calculating a PWM signal according to the key state quantity, and sending the PWM signal to the driving and isolating module. Ripple waves of the low-frequency IGBT branch circuit are compensated in real time through the high-frequency SiC branch circuit, and the problem that the ripple waves are temporarily increased when a traditional mixed topology is in a transient state is solved.

This invention proposes a method for detecting the failure of a PV common-mode inductor in an energy storage inverter, a storage medium, and an energy storage inverter. The method includes: acquiring the on / off state of the electronic switches of each PV input branch; determining whether the on / off state of the electronic switches of each PV input branch meets a preset trigger condition, wherein the trigger condition is: only one PV branch in the PV branch group corresponding to the common-mode inductor to be detected is in the active state, and each PV branch corresponding to each non-detected common-mode inductor is in the open state; when the trigger condition is met, detecting the current in any PV branch that is in the open state corresponding to any non-detected common-mode inductor, and calculating the current amplitude; if the current amplitude is greater than a preset threshold, it is determined that the common-mode inductor to be detected has a failure risk. This invention detects cross-branch current crosstalk caused by inductor failure in a multi-PV shared common-mode inductor structure online by detecting the current amplitude, and determines whether the inductor has failed.

This invention provides a power module operation control method, system, and device, belonging to the field of power electronics technology. The method includes: acquiring the topology of the power module and the converter branch current; when no fault occurs, using the rated voltage of the capacitors in the power module as a reference value, standardizing the capacitor voltages in per-unit increments, and performing a converter branch nearest-level approximation modulation algorithm to obtain a first trigger pulse; when a fault occurs and the capacitor voltage exceeds a preset threshold, reducing the voltage of the module capacitors according to the topology and converter branch current to obtain a second trigger pulse; when the voltage does not exceed the preset threshold, using the second voltage as a reference value, obtaining a third trigger pulse through a second per-unit value; and outputting the corresponding trigger pulse. This technical solution enables operation of the power module under fault conditions, thereby reducing the failure rate of the power module and improving the utilization rate of power devices.

This invention relates to the field of fault detection technology, specifically to a method and system for detecting inter-turn short circuits in generator stator windings. The method involves simultaneously acquiring stator branch current, air gap magnetic field, and frame vibration signals; preprocessing and standardizing the signals according to operating conditions; extracting and adaptively fusing three types of feature vectors—branch current circulation, magnetic field asymmetry, and vibration characteristic spectrum correlation—to generate a comprehensive fault feature vector; inputting this vector into a trained intelligent inter-turn short circuit classifier, which outputs fault discrimination results and a continuous short-circuit fault confidence index; and finally, combining the confidence index trend with the feature contribution backtracking analysis results to generate a comprehensive condition assessment report. This invention achieves highly sensitive and reliable online detection and early warning of early, weak inter-turn short circuits.

The application discloses a kind of based on branch current's latch detection method, device and latch protection circuit.The method includes obtaining the branch current from a protection branch;Branch current is converted into time-frequency domain signal;Time-frequency domain signal is structured as gray scale image;Extract the texture feature of gray scale image, whether the corresponding branch occurs latch and micro-latch is judged using pre-trained machine learning model.The method of this embodiment, directly for branch current detection, detection point quantity is exponentially decreased, improve the utilization of PCB board, also reduce the single board power consumption.In addition, the branch current of the application is structured as gray scale image, extracts the current texture feature in image, and is judged by pre-set machine learning model, the accuracy of identifying latch and micro-latch is high, supports the detection of various types of devices, so as to effectively protect the single board circuit in orbit operation, prevent it from being damaged due to latch or micro-latch.