34 results about "Phase coupling" patented technology

The invention relates to the technical field of laser cutting, and discloses a steel plate laser cutting machine fault detection method and system, and the method comprises the steps: collecting a driving power supply current signal in real time, and filtering a DC component to obtain an AC sequence; separating multi-scale sub-band components containing Gaussian noise by using wavelet transform; performing empirical mode decomposition on the sub-band components, and extracting an intrinsic mode function component set; calculating a kurtosis value and a kurtosis change rate of the component and a phase coupling index based on bispectrum analysis, and constructing a high-order statistical feature vector; a support vector machine is adopted to classify the feature vectors so as to output operation state category labels; generating a fault early warning grade value by combining the tag risk value and the kurtosis evolution trend slope; and the historical state sliding window sequence and the fault confirmation confidence coefficient are used for verification, and the early fault state is confirmed. According to the method, the problem of low nonlinear fault feature extraction accuracy under a complex noise interference background in the prior art can be solved.

An active transmission type intelligent metasurface and a matching circuit applied to the intelligent metasurface, the circuit comprising: a receiving antenna for receiving an electromagnetic wave signal; a power amplification unit for amplifying the electromagnetic wave signal received by the receiving antenna; a phase coupling unit for modulating the amplified electromagnetic wave signal into electromagnetic wave signals with various phase differences; a phase selection unit for selecting an electromagnetic wave signal with a required phase difference from the electromagnetic wave signals with various phase differences; and a radiation antenna for radiating the electromagnetic wave signal with the corresponding phase difference; the intelligent metasurface comprises a plurality of active transmission intelligent metasurface units arranged periodically to form an N*M array, and each active transmission intelligent metasurface unit in the array comprises an active transmission circuit. The present application realizes the active amplification function which the existing transmission RIS structure does not have and has the 2-bit phase control function, and the present application has low design complexity, low deployment cost and good system performance.

The invention discloses a robot control method based on active disturbance observation and phase coupling control, and the method comprises the steps: collecting the current state quantity of a robot in real time, and constructing a joint space dynamic model; generating state estimation and disturbance estimation in the joint space dynamic model; a phase parameterization method is adopted to map the phase of the multi-degree-of-freedom action to an expected trajectory, and a closed-loop trajectory tracking and disturbance compensation control law is designed in combination with disturbance estimation and a sliding manifold mechanism; according to the method, a position error transformation design continuously-derivable robot auxiliary level function is introduced, the stability is analyzed by adopting a Lyapunov method, and a closed-loop trajectory tracking and disturbance compensation control law and a coupling gain adaptive law are substituted into a time derivative of a candidate Lyapunov function to complete the control of the robot. The control output can be kept smooth and continuous, instruction sudden change or attitude instability is avoided, high action success rate and landing stability can still be maintained when the environment changes, and the landing impact load peak value is effectively reduced.

The three-phase coupling carrier communication phase switching system comprises a three-phase coupling circuit, a three-phase signal switching module, a carrier power amplifier and a carrier MCU which are connected in sequence, the control signal output end of the carrier MCU is connected with the corresponding control signal input end of the three-phase signal switching module, and the carrier MCU is connected with the corresponding control signal input end of the three-phase signal switching module. And the control module is used for analyzing the received carrier data frame, extracting the signal strength and the signal-to-noise ratio, selecting an optimal phase, generating a control signal to drive a triode in the three-phase signal switching module, and dynamically adjusting the coupling phase of three-phase carrier communication. On the premise that carrier communication performance is not affected, communication coupling phases can be switched according to field environment noise and power line conditions, and therefore higher meter reading communication efficiency is achieved.

The invention relates to the technical field of electronic magnetic elements, and discloses a coupling winding and a multi-phase coupling inductor. Wherein the coupling winding comprises N-phase windings, each phase winding comprises a main winding and an interlaced winding, the main winding and the interlaced winding are connected in series, the main winding is wound on the side column of the phase, and the interlaced winding is wound on the side column of the adjacent next phase in a bridging manner; and the N phases of windings are sequentially and circularly connected to form a cyclic symmetric topology, so that two adjacent phases of winding layers with inherent phase difference are simultaneously stacked on any magnetic column to realize active offset of interlayer magnetomotive force. According to the invention, each phase of winding is arranged to be of a series structure of the main winding and the staggered winding, and a cyclic symmetric cross-phase arrangement mode is adopted, so that two adjacent phase winding layers with an inherent phase difference are stacked on the same magnetic column at the same time, and interlayer magnetomotive force active offset can be realized by using a natural current phase difference of a multi-phase system; eddy-current loss caused by the high-frequency proximity effect is inhibited from the source, and high-frequency alternating-current copper loss of the magnetic element is greatly reduced.

The application discloses a kind of by dynamic phase coupling electromagnetic field device auxiliary vacuum diffusion welding method, belong to metal material solid-phase welding technical field.The method aims at solving the problems, such as grain coarsening, joint performance decline and heterogeneous material welding uneven caused by high temperature and long time heating in traditional diffusion welding process.The core scheme includes: (1) surface treatment, clamping positioning and vacuum pretreatment are carried out to the workpiece to be welded;(2) double-band nested induction coil structure is used, and pulse current module is loaded cooperatively, three-module electromagnetic field is realized by FPGA chip dynamic phase coupling, and periodic oscillation electromagnetic pressure field is formed;(3) based on convolution neural network model, parameters are real-time regulated during welding process, and interface diffusion behavior is optimized.The application realizes deep cooperation of pulse joule heat and induction eddy current heat through dynamic phase coupling mechanism, significantly reduces welding temperature and shortens welding time, is especially suitable for high-quality connection of copper alloy, molybdenum alloy and other heterogeneous materials, the joint tensile strength is improved, and the structure is uniform, corrosion resistance is excellent.

The invention relates to a cable insulation fault positioning method and system, and the method comprises the following steps: collecting a three-phase voltage traveling wave signal when a cable has a single-phase insulation damage grounding fault, and carrying out the signal decoupling, and obtaining an independent line mode component and a zero mode component; a Db45 wavelet basis is used as a mother wavelet, multi-scale wavelet decomposition and reconstruction are carried out on the decoupled line mode component so as to extract fault traveling wave head features, and the number of layers of multi-scale wavelet decomposition is determined according to the sampling frequency and the power grid fundamental wave frequency; and according to a wavelet reconstruction result, detecting the moment when a fault traveling wave head arrives at monitoring points at two ends of the line, thereby calculating the distance from a fault point to one end of the line. Compared with the prior art, the method has the advantages that inter-phase coupling interference is eliminated through phase-mode transformation, and serious voltage distortion and harmonic interference in a power grid are effectively suppressed by using the excellent time-frequency localization characteristic of the Db45 wavelet basis, so that the accuracy and reliability of cable insulation fault positioning are greatly improved.

The invention relates to the technical field of power supplies, and discloses a multiphase coupling inductor, a multiphase coupling inductor module, a multiphase power supply module and electronic equipment. According to the multi-phase coupling inductor, the four winding layers which are sequentially stacked in the first direction are integrally arranged through the magnetic materials, the four winding layers comprise the two layers of primary windings and the two layers of secondary windings, and the two layers of secondary windings and one layer of primary winding are arranged in a coupled mode. The multi-phase coupling inductor is small in size and large in current density.

This invention relates to the field of semiconductor technology and provides a surface-emitting laser, an optical module, and a high-speed optical engine. The surface-emitting laser includes a device body comprising an optical lasing region and a current crosstalk region. The current crosstalk region is located inside the optical lasing region, and the optical lasing region is divided into at least two resonant chambers by the current crosstalk region. A portion of the current crosstalk region is insulated so that when the two resonant chambers are enabled by their respective electrodes, a portion of the current in one resonant chamber is fed into the other resonant chamber through the uninsulated portion of the current crosstalk region, achieving coupled superposition phase (coherence). This allows for the modulation of the two chambers (superposition, cancellation, one strong and one weak). This coupling results in a high-order, two-dimensional, and phase-coupled oscillation state, which is beneficial for single-mode emission. This single-mode characteristic allows the modulation response to provide a suitable pulse shape for digital data transmission.

The invention relates to an amplitude-phase coupling type antenna array initial excitation estimation method based on amplitude measurement, and belongs to the technical field of antenna calibration. According to the method, a precise signal model containing amplitude-phase coupling characteristics is established, and a corresponding optimization solution strategy is designed, so that high-precision estimation of the initial excitation of the array unit can be realized without phase information. The initial excitation estimation method only based on amplitude measurement is suitable for an antenna array system with amplitude-phase coupling characteristics, and the initial excitation estimation of the antenna array element can be realized without obtaining phase information.

The present application relates to the technical field of fatigue detection, in particular to a hybrid tractor fatigue spectrum mutation detection method for multi-dimensional channel synchronous positioning, comprising the following steps: synchronously collecting and aligning three-channel vibration signals of the hybrid tractor to generate a synchronous multi-dimensional signal; extracting a dominant coupling strength characteristic quantity of a coupling relationship matrix in a preset characteristic frequency band in real time from the synchronous multi-dimensional signal to form a dominant coupling strength time sequence; determining a spectrum characteristic mutation point representing the fatigue state evolution of a key component and outputting an alarm signal. The present application can not only reflect the strongest mode of global coupling relationship, but also be highly sensitive to instantaneous energy concentration and mode enhancement. Compared with traditional amplitude correlation coefficient methods, the present application retains phase coupling information and can capture the global system coupling mode mutation caused by fatigue cracks, gear tooth breakage, bearing jamming and the like to realize rapid identification of potential faults of key components in an early stage.

The invention discloses a ring oscillator based on multi-phase coupling calibration, which belongs to the technical field of radio frequency integrated circuit design and comprises three mutually coupled oscillation loops based on three-stage delay units and calibration loops among the oscillation loops. In the structure, an input node of a delay unit of each oscillation loop is connected with a calibration unit of a calibration loop, when phases at two ends of the calibration unit are inconsistent, oscillation loop current is redistributed through the calibration unit, and phase alignment is realized through a current real-time compensation mechanism; after the three oscillation loops are mutually coupled, phase jitter caused by external noise disturbance of any oscillation loop can be fed back to the other two oscillation loops through the calibration loop, so that automatic compensation and equalization of phase errors are realized in the whole system, and the phase noise of each oscillation loop is effectively reduced. Meanwhile, the dynamic phase calibration mechanism of the three oscillation loops significantly enhances the single event effect resistance of the circuit.

The invention relates to the technical field of information hiding, in particular to a quantum generative adversarial network steganography system based on double discriminators and an information hiding method. The system comprises a quantum generator G theta theta, a distribution discriminator and a steganalysis discriminator S. Each layer of the quantum generator G theta theta is sequentially provided with an Rx rotating door, an Ry rotating door and an Rz rotating door to form a complete single-bit rotating degree of freedom, the door sequence adopts Rz (theta z) * Ry (theta y) * Rx (theta x), Rx regulates amplitude distribution, Ry gives consideration to amplitude and phase coupling, Rz carries out fine phase calibration, and Rz carries out steganalysis. An entanglement layer adopts hybrid topology, an annular controlled NOT gate CNOT is applied to each layer, and interval controlled NOT gates CNOT are additionally applied to even layers. According to the quantum steganography system, collaborative improvement of the quantum steganography system in three dimensions of distribution fitting precision, steganography safety and training stability is realized.

The invention discloses an electromagnetic scale stabilization control method and system considering energy amplitude phase coupling, and the method comprises the steps: calculating an active power reference value of a converter based on the variable quantity of the voltage amplitude and the variable quantity of the voltage phase of a filter capacitor at an outlet of the converter in combination with an active power output initial set value; calculating a reactive power reference value of the converter based on the variation of the voltage phase of the filter capacitor at the outlet of the converter and the variation of the voltage amplitude in combination with a reactive power output initial set value; calculating current reference values of a d axis and a q axis based on the active power reference value and the reactive power reference value of the converter; and based on the current reference values of the d axis and the q axis and the actual current signals of the d axis and the q axis, a three-phase modulation voltage signal is obtained, and the three-phase modulation voltage signal is used for controlling the converter after being subjected to PWM (Pulse-Width Modulation). According to the invention, adverse effects of energy coupling dynamics caused by constant power control of power electronic equipment on system stability can be avoided.

The invention discloses a segmented roller power supply system synchronous control method and system for electromagnetic stirring of wide and thick slabs, a phase and frequency compensation instruction is added in a feedback control link of output current of each power supply unit, the output current of each power supply unit is controlled to be synchronous with specified reference current, and the multi-roller synchronous electromagnetic stirring requirement of an electromagnetic stirring power supply is met. The output current of each power supply is detected in real time, the amplitude and phase of the output current are extracted in real time through a phase-locked loop, a center phase and the offset thereof are introduced on the basis of multi-channel phase coupling of each unit, the center phase and the offset thereof are compensated to a current angular frequency and added to a current instruction in real time, and the synchronous control precision of the power supply system is improved. And the synchronization function of output current of a plurality of two-phase orthogonal power supplies is realized. Therefore, for multiple groups of electromagnetic stirring rollers needing to output the same magnetic potential, the control method can solve the problem that synchronous electromagnetic stirring forces of the multiple rollers are mutually counteracted.

The invention relates to the technical field of power distribution network voltage measurement, and discloses a closed space three-phase voltage non-contact measurement method based on transmission matrix inverse transformation, which comprises the following steps: acquiring aliasing voltage through a non-contact voltage sensor; calculating an inter-phase coupling coefficient and a phase shift coefficient among the three-phase conductors; constructing a transmission matrix based on the coupling coefficient and the phase shift coefficient; and solving an inverse matrix of the transmission matrix to obtain three-phase independent actual phase-to-ground voltage, and finally calculating three-phase actual voltage. An amplitude coupling coefficient and a phase shift coefficient between the non-contact voltage sensor and a conductor are obtained in a closed space, and a transmission matrix is constructed; inversion is carried out on the transmission matrix, and three-phase independent voltage is obtained through measurement voltage and inverse matrix decoupling calculation. Inverse transformation of the transmission matrix is used to suppress the interphase coupling influence, and the measurement precision of the non-contact voltage sensor in a closed space is significantly improved.

A triaxial atom magnetometer full-band decoupling method based on a complex transfer matrix aims to solve the problems in the existing triaxial SERF atom magnetometer decoupling technology, comprehensively considers amplitude and phase coupling information and realizes full-band and high-precision triaxial magnetic field decoupling measurement, and is characterized by comprising the following steps: modeling a triaxial SERF atom magnetometer measurement system into a linear system; a complex transfer matrix representing amplitude and phase linear coupling characteristics among three axes in a full frequency band is obtained through calibration, a measured three-axis response signal is converted by using an inverse matrix of the complex transfer matrix in measurement, and a three-axis magnetic field after full frequency band decoupling is solved. On the premise of considering complete phase information for the first time, three-axis complete decoupling measurement is realized, dependence on magnetic field compensation is remarkably reduced, and a universal solution is provided for high-precision full-band vector magnetic field measurement.

The application relates to the technical field of laser cutting and discloses a steel plate laser cutting machine fault detection method and system, the method comprising the following steps: collecting a driving power current signal in real time and filtering out a direct current component to obtain an alternating current sequence; separating a multi-scale subband component containing Gaussian noise by using wavelet transform; performing empirical mode decomposition on the subband component to extract an intrinsic mode function component set; calculating the kurtosis value, kurtosis change rate and phase coupling index based on bispectrum analysis of the component to construct a high-order statistical feature vector; classifying the feature vector by using a support vector machine to output an operation state category label; combining the label risk value and the kurtosis evolution trend slope to generate a fault early warning grade value; and verifying early fault states by using a historical state sliding window sequence and a fault confirmation confidence degree, so that the method can solve the problem of low precision of nonlinear fault feature extraction in a complex noise interference background existing in the prior art.

The application discloses a microwave communication signal phase compensation method and system, and particularly relates to the technical field of communication signal phase compensation, and is directed to microwave links under high-speed movement, strong Doppler and rich multipath environment. The method first completes multi-source access and alignment, pre-synchronization and external parameter fusion on a unified time base, and identifies a scene / mode label M; then a cooperative mechanism of external parameter driven feedforward phase evolution and pilot / judgment driven feedback residual error estimation is constructed, quality measurement gates such as EVM, CPE variance, locking degree and LLR are adaptively fused, and a target phase trajectory covering a short-time prediction time domain is generated; total delay is compensated on the execution side, and lead driving is implemented, a cooperative synthesis of coarse path and fine path is adopted, time subdivision is matched to improve equivalent resolution and amplitude balance of code word association, and amplitude-phase coupling is suppressed, instructions are organized in common / differential components in an array scene, and hardware-level synchronous triggering is implemented.

The invention discloses a continuous phase adjustable interconnection reconfigurable intelligent surface unit structure based on pairwise grouping, and further discloses a reconfigurable intelligent surface array and an array system adopting the unit structure. The unit structure comprises a radiation unit group and a power distribution and interconnection network module, the radiation unit group at least comprises two radiation units, each radiation unit is connected with a corresponding phase regulation and control branch, and each phase regulation and control branch is provided with at least two cascaded phase shifter modules. The phase shifter module comprises a radio frequency transmission part and a grounding branch with an equivalent control switch, and the power distribution and interconnection network module is connected with each phase regulation and control branch and establishes a determined amplitude and phase coupling relation, so that the equivalent reflection phase of the radiation unit group is continuously adjustable. The phase resolution is effectively improved, the regulation freedom degree is enhanced, the unit structure is easy to expand, the engineering realizability is high, and the unit response consistency of a large-scale array can be improved.

The application discloses a kind of wide slab electromagnetic stirring with section roller power supply system synchronous control method, system, in the feedback control link of each power unit output current, join phase and frequency compensation instruction, control each power unit output current and specified reference current synchronization, satisfy electromagnetic stirring power multi-roller synchronous electromagnetic stirring requirement.Through real-time detection of the output current of each power supply, and by extracting the amplitude and phase of the output current in real time through the phase-locked loop, introduce the center phase and its offset on the basis of multi-channel phase coupling of each unit, and compensate to the current angular frequency, and real-time join current instruction, improve the synchronization control precision of power supply system, realize the synchronization function of the output current of multiple two-phase orthogonal power supplies.Therefore, for the multiple electromagnetic stirring rollers that need to output the same magnetic potential, the control method of the application can solve the problem of mutual cancellation of multi-roller synchronous electromagnetic stirring force.

The utility model discloses a power platform of a switching module and a switching machine, and belongs to the technical field of household appliances. The power platform comprises a transmission structure and an assembly part. The transmission structure comprises a double-output-part motor which comprises a first output part and a coupling output part; the phase change coupler comprises a second output part and a third output part; the rotating speed of the first output part is greater than that of the second output part and that of the third output part; the assembling part comprises a clamping boss, a first connecting part and a second connecting part, a through opening is formed in the outer end of the clamping groove, and a third through hole is formed in the inner end of the clamping groove; the clamping boss is located above the clamping groove. An assembly interval is arranged between the clamping boss and the inner end of the clamping groove, and a second through hole is formed in the assembly interval; and the first direction and the second direction are mutually staggered. According to the utility model, the output parts of three levels of rotating speeds are integrated together, and various assembly structures are provided to adapt to the integrated arrangement of different assembly modules.

The application discloses a multi-phase power supply phase coupling interference suppression system and method, and relates to the technical field of power supply.The system comprises an interference feature extraction module and a compensation module.The interference feature extraction module is used for acquiring a first interference voltage signal of a reference voltage port and switch voltage signals of a plurality of first nodes, and extracting interference feature parameters based on the first interference voltage signal and the plurality of switch voltage signals.The interference feature parameters comprise an interference frequency, an interference amplitude and an interference initial phase.The compensation module is used for receiving the interference feature parameters, generating a first compensation voltage signal based on the interference feature parameters, and transmitting the first compensation voltage signal to the reference voltage port to correct the first interference voltage signal.The technical problem that the reference voltage signal of the reference voltage port of a single-phase load power supply is disturbed by multi-phase power supply and fluctuates is solved, and the stability and reliability of the single-phase load point power supply are improved.

The invention relates to the technical field of radio frequency integrated circuits, in particular to a high-linearity differential power amplifier based on an output anti-phase coupling network. Comprising an input matching network, a differential power amplifier, an output matching network and an output inverting network, the output end of the input matching network is connected with the input end of the differential power amplifier; the output end of the differential power amplifier is connected with the output matching network; the output inverting network is connected in parallel with the output end of the differential power amplifier; and the output inverting network is used for compensating the differential amplitude-phase imbalance introduced by the output matching network in the millimeter wave frequency band and balancing the drain voltage swing of the differential transistor pair in the differential power amplifier. Through the common-mode suppression mechanism, the drain voltage swing of the differential pair transistors is forcibly balanced, the single-side overvoltage risk is eliminated, and the reliability of the device under high voltage is remarkably improved.

The invention discloses a CMOS low-noise amplifier topological structure based on noise cancellation and gain enhancement, and belongs to the field of CMOS radio frequency integrated circuits. Comprising a mixed noise cancellation module which adopts a'multi-coil phase coupling + five-order resonance 'mixed mechanism, and a gain collaborative enhancement module which adopts a'transconductance enhancement + differential gain compensation' two-stage structure. The input matching module is a pi-type passive matching network, is composed of two capacitors and an adjustable inductor, is adaptive to impedance matching of an ultra-wideband of 500MHz-10GHz, and provides passive voltage gain at the same time; the mixed noise cancellation mechanism can synchronously suppress coupled noise, thermal noise, parasitic noise and out-of-band interference, and compared with the prior art, the noise coefficient is remarkably optimized, and the signal purification capacity is higher; the gain cooperative enhancement module realizes wide-band coverage, high-frequency gain roll-off is effectively suppressed through gain compensation design, full-band gain fluctuation is controlled within a reasonable range, and both the broadband characteristic and the high-gain performance are considered.

The invention belongs to the technical field of lasers, and discloses a birefringence phase regulation soliton rain switching fiber laser. According to the laser, a pumping source, a wavelength division multiplexer, an erbium-doped gain fiber, a polarization independent isolator, a polarization controller, a polarization maintaining fiber, an output coupler and a saturable absorber form an annular resonant cavity. The core is that controllable phase delay is introduced by using a high-birefringence panda type polarization maintaining optical fiber so as to modulate filtering conditions in a cavity and remodel energy and phase coupling modes of a background field and a condensed phase. Under the condition that the pumping power and the polarization state are constant, controllable switching between the one-way drifting soliton rain state and the two-way drifting soliton rain state can be achieved by changing the length of the polarization maintaining optical fiber. The problem that soliton rain is large in randomness and uncontrollable is solved, and a controllable and accurate experimental platform is provided for multi-body interaction and co-evolution research in a dissipative soliton system.

The invention discloses a fault prediction system based on electrical behavior feature mapping, and relates to the technical field of fault prediction. Comprising an electrical behavior data acquisition and processing module used for acquiring electrical behavior data in real time, performing data preprocessing and extracting electrical behavior characteristics; the phase coupling integrity evaluation module is used for extracting cross-phase phase difference deviation and fluctuation characteristics, forming a coupling integrity index and judging a phase coupling steady state; the broadband disturbance feature recognition module is used for extracting disturbance enhancement features, forming an arc disturbance index and judging the arc steady state; and the early-stage arc evolution evaluation module is used for fusing the coupling integrity index and the arc disturbance index, constructing an arc joint deviation amount, forming an early-stage evolution score in a window, judging an arc evolution stage and generating intervention measures. The problems that traditional monitoring cannot capture early hidden coupling damage of the arc and evolution of the arc from the early stage to the development stage is difficult to recognize in time are solved.

The application discloses a Watson-Watt direction-finder amplitude-phase calibration method and device, constructs a double-channel amplitude-phase coupling deviation reference spectrum through amplitude-phase deviation extraction and drift direction classification; establishes a channel deviation coupling relationship spectrum by jointly tracing the temperature drift and frequency dependence of each deviation factor, generates an overshoot risk mark by combining the compensation direction flip risk quantization; based on the channel deviation coupling relationship spectrum and the overshoot risk mark, carry out calibration residual convergence evaluation, determine the deviation level and identify the blocking factor set; according to the cross-frequency transfer path of the blocking factor set, complete the frequency range classification weight distribution, obtain the deviation value of each frequency range, and determine the deviation distribution type through polarity flip detection and asymmetry grading; finally, complete the cross-frequency range amplitude-phase linkage compensation amount solution and output the amplitude-phase calibration compensation parameters combined with the deviation level, realize the system identification and linkage compensation of the double-channel amplitude-phase deviation in the wide frequency range working scene.

The invention discloses a data-driven three-phase unbalanced power distribution network overall perception and evaluation method, and relates to an overall perception and evaluation method for the three-phase balance degree of a middle and low voltage power distribution network. The invention discloses a data-driven three-phase unbalanced power distribution network overall perception and evaluation method. The method comprises the following steps: S1, constructing a three-phase power coupling sensitivity characteristic model; s2, constructing a feeder line branch load flow model considering inter-phase power coupling; s3, a three-phase coupling linear power flow model based on LinDistflow is constructed; and S4, evaluating the overall operation state of the power distribution network. The model constructed by the invention not only can be used for modeling calculation, but also can evaluate the overall operation state of the analysis system under different load power states according to the sensitivity characteristic based on incomplete operation measurement data. The overall accurate perception of the power distribution network is realized, and the functions of state estimation, optimal scheduling and the like of the power distribution network can be further supported.

The application provides an inductance structure and a power supply circuit, comprising: at least one magnetic core and N groups of windings, each group of the windings comprising one phase output coil and one phase-to-phase coupling coil; the magnetic core is provided with a through hole, the phase output coil and the phase-to-phase coupling coil of each group of the windings pass through the same through hole and are respectively arranged on both sides of the through hole, at least one group of the windings is arranged on one magnetic core, each phase-to-phase coupling coil is located on the same side of the magnetic core, each phase output coil is located on the other side of the magnetic core, and the phase output coil and the phase-to-phase coupling coil are insulatively arranged; wherein N is a natural number greater than or equal to 2. The magnetic core of the inductance structure adopts a magnetic powder core material, and the negative coupling between multiple inductances is realized through an indirect coupling mode, and the inductance structure has the advantages of fast transient response speed, small inductance size, strong heat dissipation capacity and the like for large current application.