94 results about "Base frequency" patented technology

The ELM-based frequency safety constraint linearization optimization scheduling method comprises the following steps: establishing a fire-wind-light multi-energy complementary frequency dynamic response model, and deducing a time domain analytical expression of a frequency safety index by taking a frequency maximum change rate and a frequency maximum deviation as the frequency safety index of a system; considering a frequency lowest point security constraint and a frequency maximum change rate security constraint, and establishing a frequency security constraint-containing optimization scheduling model; a maximum bearable disturbance power linearization mapping method based on ELM is provided, nonlinear frequency security constraints are converted into a series of linear constraint sets, and linearization processing of the frequency security constraints is achieved; and piecewise linearization is carried out on quadratic terms in the established objective function containing the frequency security constraint optimization scheduling model, the overall model is converted into a mixed integer linear model, and a Gurobi solver is used to solve the linearly processed model. The scheduling method can ensure that the system frequency is safe and stable, so that the established optimal scheduling model gives consideration to both economy and frequency safety.

Provided in the present invention are a primary frequency regulation dynamic simulation method and apparatus based on a thermal power condensate water throttling strategy, which are used for analyzing the dynamic characteristics of a unit when a power plant executes a primary frequency regulation instruction by means of a condensate water throttling strategy after a power disturbance occurs in a power grid. The dynamic characteristics mainly comprise the characteristics of a steam turbine speed governor system, the characteristics of a variable-frequency condensate pump system, the dynamic heat exchange characteristics of a low-pressure heater and extraction steam, the flow characteristics of an extraction steam pipeline, and the output characteristics of a steam turbine body. A moving boundary method is mainly applied to a heat exchange process between condensate water (a cold fluid) and shell-side extraction steam (a hot fluid) in a low-pressure heater. The heat exchange process between the cold and hot fluids can be divided into a superheated section, a phase change section and a subcooled section on the basis of the aggregation state of the extraction steam. When the moving boundary method is applied to a steam turbine regenerative system, the dynamic variation laws of extraction steam temperature and pressure can be more accurately obtained, and the extraction steam pressure on a low-pressure heater side is a key factor in determining the extraction steam flow rate on a low-pressure cylinder side, and is also critical in determining the instantaneous power increment of a steam turbine. Moving boundary method-based frequency regulation dynamic simulation for thermal power condensate water throttling takes into account relatively comprehensive actual process factors, and only one-dimensional modeling along an axial main flow direction is taken into account, thus combining the advantages of fast and accurate simulation. A fast and accurate simulation method is a prerequisite for implementing power grid frequency security analysis. By mastering the dynamic process of power plant load response from the moment a frequency deviation exceeds a dead band to the moment same returns to the dead band, a foundation can be provided for the primary frequency regulation control of power plants and the frequency security analysis of power grids.

The invention relates to the technical field of protocol conversion, in particular to an E1 / IP video conference protocol conversion device and system, and the system comprises a frame structure mapping module, a signaling adaptation module, a media stream packaging module, a buffer area control module and a synchronous coordination module. According to the invention, the synchronization mark and the load field of the physical layer framing structure are extracted, the maximum transmission unit parameter is combined, the frame packet boundary is accurately identified, the cross-network data positioning accuracy is improved, the call control mapping relation is established based on key field identification, and the session continuity between heterogeneous signaling is enhanced; the audio and video sampling rate and timestamp fundamental frequency are matched and verified, the consistency of media stream transmission time delay is guaranteed, interface throughput and time slot occupation changes are dynamically monitored, a buffer regulation and control instruction is generated, and the data transmission stability under burst flow is improved; the synchronization accuracy of the protocol conversion system in a heterogeneous network environment is realized, and the reliability of real-time services such as video conferences and the like is enhanced.

The invention provides an impact table top optimization method and device based on multi-physics field coupling and a storage medium, and belongs to the technical field of mechanical impact simulation. According to the scheme, an impact table top is modeled, a large number of finite element models are randomly constructed according to a modeled structure model, and the impact table top is optimized; the model simulation system is used for carrying out analogue simulation on each finite element model, and the finite element model with the highest fitness is determined, so that the impact table top can be optimized according to table top parameters corresponding to the finite element models, and the performance requirements of light weight, high fundamental frequency and high strength / rigidity can be met at the same time; therefore, the impact table board can be in an extreme dynamic environment with high energy, transient impact and broadband excitation.

The invention provides a multi-channel microwave signal generation method and system with a fixed initial phase, and the method comprises the steps: responding to a triggering signal received by a high-speed clock synchronization module after a pre-configured synchronous clock signal is inputted to the high-speed clock synchronization module; the high-speed clock synchronization module generates a sampling clock signal and a logic clock signal based on the synchronous clock signal, responds to the logic clock signal and inputs the logic clock signal to the high-speed controller, the high-speed controller generates a signal description word while triggering signal input, responds to the sampling clock signal and inputs the sampling clock signal to the direct digital frequency synthesis module; and the direct digital frequency synthesis module generates an analog fundamental frequency signal required by the multi-channel microwave signal source based on the signal description word, responds to the analog fundamental frequency signal and inputs the analog fundamental frequency signal to the phase-locked loop device, and the phase-locked loop device outputs a final target microwave signal.

The invention relates to the technical field of life prediction of a permanent magnet in a permanent magnet synchronous motor, and discloses a multi-element segmented degradation modeling and life prediction method for the permanent magnet of the permanent magnet synchronous motor, which comprises the following steps of: firstly, selecting a back electromotive force fundamental frequency amplitude drop rate and a characteristic harmonic content rise rate as degradation characteristic quantities; respectively representing overall and local demagnetization behaviors of the permanent magnet; the method comprises the following steps: acquiring data through an accelerated degradation test, and establishing a segmented Wiener process model to describe stage characteristics of degradation; utilizing a t-Copula function to construct a joint distribution model of the multivariate degradation characteristic quantity; extrapolating model parameters under normal stress by combining an Arrhenius model and a segmentation point-temperature model; and life prediction is carried out by adopting Monte Carlo simulation, and the model precision is verified through an area ratio index and a cross validation method. According to the method, the degradation process of the permanent magnet can be comprehensively and accurately represented, high-precision life prediction is realized, and the method is suitable for reliability evaluation and preventive maintenance of a motor system.

A high-frequency power supply system according to the present disclosure includes a first power supply, a second power supply, and a first matcher. The first power supply performs frequency modulation control in a second power supply ON period and performs frequency offset control to output a forward wave voltage VF3 having a fundamental frequency F3 obtained by adding an offset frequency to a fundamental frequency F1 in a second power supply OFF period. An optimum value of an initial phase α of a modulation signal is searched for, and an offset frequency Fos at which a difference between a reflection coefficient ρ11 or load-side impedance Z11 corresponding to a center of a locus and a reflection coefficient ρ12 or load-side impedance Z12 is minimum is searched for, and the fundamental frequency F3 in the second power supply OFF period is set.

The application relates to the field of laser technology, in particular to a device and a method for generating wide-tuning narrow-line-width mid-infrared laser, wherein the pump light emitted by a nanosecond pulse OPO base frequency pump source is reflected to a beam splitter by a full reflection mirror after passing through a first adjuster; the pump light emitted by a continuous wave OPO base frequency pump source is irradiated to the beam splitter after passing through a second adjuster; the two beams of pump light are combined after passing through the beam splitter, are focused after passing through a plano-convex lens, are irradiated to a first plano-concave full reflection mirror, and then are transmitted to a nonlinear crystal to generate signal light and idler mid-infrared laser through nonlinear frequency conversion; the idler mid-infrared laser and the residual pump light are transmitted to a doublet mirror and are separated by the doublet mirror; the signal light is reflected to the nonlinear crystal in sequence through a second plano-concave full reflection mirror, a first plane full reflection mirror, a second plane full reflection mirror and the first plano-concave full reflection mirror, and an oscillation closed loop is formed. The application realizes that the pulse OPO outputs a pulse with a line width less than 90 MHz in the tuning range, and the extraction efficiency of the idler light is as high as 9.3%.

The invention discloses a wind turbine generator frequency modulation control method based on inertia requirements. The method comprises the following steps: analyzing main factors influencing system frequency response characteristics; according to an analysis result, taking the frequency change rate as a constraint, and carrying out system minimum inertia demand evaluation; according to an analysis result, performing system minimum inertia demand evaluation by taking the maximum frequency offset as a constraint; the maximum value of the two constraints is adopted as the minimum inertia demand of the system, so that the sufficient inertia of the system is ensured, and the frequency stability of the system is improved; and constructing a target function according to the results to obtain the output power of the wind turbine generator, and participating in system frequency modulation. In order to solve the problems that the existing comprehensive inertia simulation synchronous machine control is insufficient and the consideration factors of the system minimum inertia evaluation are not comprehensive, a wind turbine generator rotor kinetic energy optimal frequency output power control scheme based on the system minimum inertia demand is provided, and the flexibility and plasticity of the wind turbine generator converter control output power are fully exerted. And the system frequency stability is enhanced.

Technological advancements are disclosed that utilize inertial sensor data for multiple classes to select a combination of filters to extract information though features to train a machine learning core decision tree. A determination is made whether the data for a class includes a frequency peak or dominating frequency that contains significant information about the class. In response to the data for the class including a frequency peak, a peak-based frequency range is determined. An entropy value is calculated for multiple frequency ranges in the data for the class. An entropy-based frequency range is selected from the multiple frequency ranges having a minimum entropy value. A frequency of interest is selected from the peak-based frequency range and the entropy-based frequency range for the class. A combination of filters is selected for each frequency of interest for each class and a decision tree is trained based on selected filter combination.

The present application relates to the technical field of geophysical electromagnetic exploration data processing, and specifically discloses a kind of orthogonal digital phase-sensitive detection time-frequency electromagnetic complex response extraction method, automatically extracts base frequency and initial phase using transmitter stored time-stamped current data, constructs zero initial phase orthogonal reference signal, carries out two-way digital phase-sensitive detection to receiver full waveform sampling data, obtains in-phase component and quadrature component, so as to calculate the complex response amplitude and phase information of target frequency.The present application does not need analog phase-locked loop and artificial phase modulation process, can stably extract complex response parameters under strong interference and strong noise background, is especially suitable for array time-frequency electromagnetic receiver full waveform sampling data post-processing, without transmitting current waveform to each receiving node in real time, improves the flexibility and scalability of time-frequency electromagnetic system.

The application discloses an infrared image denoising method, computer equipment, medium and product, and relates to the technical field of image processing. The method comprises the following steps: firstly, constructing a structure tensor matrix corresponding to each pixel point in the infrared image through horizontal and vertical pixel gradient matrices; then, realizing separation of a base frequency component and a high frequency component of the infrared image based on an anisotropy measurement map, processing the main structure and the detail information respectively, and avoiding problems such as detail loss or noise residue caused by the traditional denoising method. In the high frequency component processing, the high frequency noise is efficiently filtered through the steps of overlapping block division, structure similarity reference sub-block screening, three-dimensional block group singular value decomposition and adaptive threshold shrinkage, and the integrity of the detail information is ensured by means of sub-block stacking and inverse transformation reconstruction. Finally, the fusion of the base frequency component image and the denoised high frequency component image ensures that the output image has clear main structure and retains key details such as edges and textures.

The invention discloses a resonance network for suppressing transient recovery voltage of a circuit breaker, and belongs to the technical field of high-voltage alternating-current circuit breaker switching-on and switching-off. The resonance network is composed of a metal oxide arrester and N resonance branches with the same structure. The number N of the resonant branches and the resonant frequencies of the resonant branches are obtained through an electromagnetic transient simulation model; the resonant frequency presents low impedance near the transient recovery voltage fundamental frequency, a shunt and energy consumption path is provided for the high-frequency oscillation current, and active suppression of the rising gradient and the oscillation amplitude of the transient recovery voltage is achieved. The metal oxide lightning arrester is used as backup protection, and clamps the transient recovery voltage peak value when the suppression effect of the resonance branch is insufficient or abnormal. The resonant network can significantly suppress the rise rate and amplitude of transient recovery voltage under a high voltage level in a medium strength recovery critical period, effectively improves the on-off reliability of the vacuum circuit breaker, and has good working condition adaptability and system safety.

The application discloses a kind of suitable for cascade full-bridge SVF valve loss calculation method.First, based on system parameters and operating conditions, the time-domain characteristic curve of SVF bridge arm current and voltage in base frequency period is solved.Then, combined with the nearest level modulation and the control strategy of in-phase submodule capacitor voltage balance, the influence mechanism of control frequency is calculated, and the switch function of each submodule is calculated.In addition, for selected model switch device, the characteristic curve is fitted by curve fitting method, the key parameters required for loss calculation are extracted, and the loss model of the device is constructed.Finally, based on the established loss model and the switch function of submodule, the operating loss and switching loss of SVF are calculated respectively, and then the total valve loss is synthesized.The application adopts analytical method to realize fast loss calculation under different operating conditions, which can accurately calculate the influence of modulation strategy and control parameters on loss, and has excellent calculation accuracy, which significantly improves the accuracy compared with existing algorithm.

The invention discloses an energy storage system deep reinforcement learning frequency modulation control method based on health state perception, and relates to the field of power system frequency modulation. The method comprises the steps of S1, collecting and preprocessing power grid frequency deviation, load disturbance and energy storage SOC, SOH and power data; s2, constructing a DRL control framework of MDP modeling, and defining a state space containing SOH, a continuous action space and a multi-target composite reward function; s3, adopting a DDPG algorithm to train the model, and optimizing an energy storage power instruction through an Actor-Critic network to meet frequency and energy storage security constraints; and S4, evaluating a frequency index and an energy storage SOH attenuation rate through step and fluctuation disturbance verification. Through SOH perception and DRL optimization, the problems that traditional control response is slow and energy storage life is ignored are solved, balance between frequency stability and energy storage life is achieved, and the method is suitable for primary frequency modulation of a high-proportion new energy power grid and has remarkable engineering application value.

The electronic control device of the present application is provided with: a flow rate calculation section that calculates the flow rate of intake air from an output signal of a flow rate measuring device attached to an intake pipe; a flow rate correction value calculation section that calculates an average value, a maximum value, a minimum value, and an amplitude of a signal of one or more frequencies included in the output signal of the flow rate measuring device and above a fundamental frequency of the output signal of the flow rate measuring device, for a prescribed period, of the flow rate of intake air calculated by the flow rate calculation section, and calculates a correction value for the flow rate of intake air from the calculation results; and a flow rate correction section that corrects the flow rate of intake air according to the correction value.

The invention provides a dual-mode broadband phase-locked loop and a frequency chain configuration method thereof, and relates to the technical field of radio frequency integrated circuits, and the dual-mode broadband phase-locked loop comprises a voltage-controlled oscillator which generates an oscillation signal in a fundamental frequency range; a frequency multiplication output path including an output frequency multiplier that multiplies the oscillation signal to a high frequency band; a frequency division output path including an output frequency divider that divides the oscillation signal to a low frequency band; the feedback link comprises a frequency divider output to a phase frequency detector, and the output end of the phase frequency detector is connected to the control end of the voltage-controlled oscillator through a charge pump and a loop filter; and the control module selects to start different output paths through register programming. In the communication mode, fractional frequency division of the frequency divider is controlled through the sigma-delta modulator, so that the phase noise performance is improved; in a radar mode, a frequency multiplication output path is started to generate a millimeter wave signal. According to the invention, wide frequency band output of 10 MHz to 50 GHz can be covered, dual-mode rapid switching and accurate control are realized, and the dual-mode switching device is suitable for various application scenes such as communication and radar.

The application discloses a four-bridge-arm driving permanent magnet synchronous motor parameter identification method based on d-axis current injection, which comprises the following steps: obtaining a q-axis current reference value according to a rotating speed ring; calculating a d-axis current reference value, an electric frequency of a base frequency required by a resonance controller and a phase compensation value, calculating a current d-axis and 0-axis control cycle resonance controller output, and injecting a d-axis current by setting the d-axis current reference value; calculating a reference voltage by FOC and performing inverter nonlinear compensation; calculating a reference value of three-phase voltage relative to a neutral point voltage, and further obtaining a driving signal; identifying resistance, inductance and a base wave flux linkage in real time based on an FFRLS algorithm; calculating a term containing third harmonic flux linkage information through a low-pass filter; and finally obtaining the third harmonic flux linkage through the FFRLS algorithm. The parameter identification method has the advantages of low cost, simplicity and the like.

This invention discloses an automatic frequency-elevation map measurement method and system based on residual networks, enabling rapid and automatic extraction of key ionospheric parameters from frequency-elevation maps acquired by digital altimeters. The method first parses the header information and echo intensity data from the original binary file of the altimeter to generate a frequency-elevation map image. Then, a small number of samples are manually labeled to establish a training set with critical frequencies such as foF2 and h'F2 as ground truth. Based on this, an end-to-end model including a backbone residual network, pooling layers, and a feature extraction head is built. This model is trained to convergence through backpropagation and further fine-tuned using expanded sample data to obtain an engineering-deployable model. Finally, the frequency-elevation map to be processed is input into the model, and the predicted values ​​of the target parameters are output and written to the results file. This method reduces the workload of manual interpretation and verification and improves the measurement accuracy of irregular and disturbed frequency-elevation maps.

The invention discloses an active sonar echo reverberation suppression method and device based on odd-number high-order cumulants. The method mainly comprises the steps that echoes of single-frequency pulse signals emitted by an active sonar are received by using a vector hydrophone; performing narrowband filtering and reverberation normalization processing on the echo; performing odd-order high-order cumulant calculation on the processed signal; and filtering the signal obtained after cumulant calculation, and filtering out harmonic waves to obtain a fundamental frequency signal. According to the method and the device, noise and reverberation of the active sonar echo signal can be effectively filtered out, the signal-to-mixing ratio is improved, and engineering implementation is simple and feasible.

The method comprises the following steps: analyzing the main factors affecting the frequency response characteristics of the system; according to the analysis result, taking the frequency change rate as the constraint, evaluating the minimum inertia demand of the system; according to the analysis result, taking the maximum frequency deviation as the constraint, evaluating the minimum inertia demand of the system; taking the maximum value of the above two constraints as the minimum inertia demand of the system to ensure the inertia sufficiency of the system and improve the frequency stability of the system; according to the above result, constructing the objective function to obtain the output power of the wind turbine generator participating in the system frequency modulation. In view of the problems of the current comprehensive inertia simulation synchronous machine control and the incomplete consideration of the system minimum inertia evaluation factors, the optimal frequency output power control scheme of the rotor kinetic energy of the wind turbine generator based on the system minimum inertia demand is proposed, the flexibility and plasticity of the output power of the wind turbine generator converter control are fully utilized, and the frequency stability of the system is enhanced.

The application relates to the technical field of industrial equipment state monitoring and fault diagnosis, and discloses a centrifugal fan fault prediction method and system. The method comprises the following steps: collecting bearing mixed vibration data and reconstructing an initial vibration sequence, removing strong base frequency interference by using empirical mode decomposition and energy frequency screening mechanism to obtain a residual vibration signal; performing discrete wavelet transform and adaptive soft threshold denoising on the residual vibration signal, and cooperating with Hilbert envelope slice quantization to obtain a time-varying impact sequence; calculating a dynamic change rate of the time-varying impact sequence, combining a base frequency component to classify and fit an independent fault characteristic curve; constructing a fault trend distribution surface based on the fault characteristic curve, separating eccentric evolution and damage expansion trajectories by energy flow decoupling, and comparing a threshold to determine a prediction result. The application can effectively overcome the covering of weak impact characteristics by strong base frequency vibration, and realize high-precision independent prediction of centrifugal fan impeller imbalance and bearing pitting under complex coupling faults.

A method for detecting abnormal activity of a driver implemented by a monitoring device which includes an angle acquisition unit that obtains an angle signal during a preset time period, and a processing unit. The method includes: generating a spectrogram from the angle signal; obtaining a frequency set within the preset time period; obtaining, based on the frequency set, candidate time point(s), each corresponding to a frequency in the spectrogram that is greater than a dynamic frequency threshold; obtaining a base frequency signal based on the spectrogram; converting the base frequency signal to a base angle signal using a signal conversion technique; obtaining a peak time point that corresponds to a maximum angle value of the base angle signal within the preset time period; and obtaining an occurrence period related to an occurrence of the abnormal activity based on the peak time point and the candidate time point(s).

The application discloses a frequency diversity array time domain beam control method based on dynamic frequency offset and belongs to the field of microwave and radio frequency electronic technologies. The method comprises the following steps: obtaining a transmission time window and a target angle corresponding to a target beam pointing direction in the transmission time window; in the duration of the transmission time window, based on the target angle, dynamically determining a frequency offset increment between each array element in the frequency diversity array, wherein the frequency offset increment is in inverse proportional relationship with the value of an equivalent time parameter; based on the frequency offset increment, controlling each array element of the frequency diversity array to transmit a signal of a corresponding frequency, so that the synthesized beam continuously points to the target beam pointing direction in the transmission time window. Through dynamic phase compensation, the application offsets the phase drift caused by time accumulation; meanwhile, while reducing the bandwidth requirement, the application physically eliminates beam distortion by using frequency symmetric distribution.

A frequency shifting device based on the Doppler effect, a noise bypass frequency shifting device based on the receiver, a composite noise reduction device, and a method are disclosed. The frequency shifting device based on the Doppler effect includes: a rotor module (101) with a noise port, the noise port including a first noise port (10101) and a second noise port (10102). The first noise port (10101) is connected to the second noise port (10102) on the noise propagation path. The first noise port (10101) is used to connect to a sound source or output frequency-shifted noise. The second noise port (10102) follows the rotor module (101) in a periodic motion relative to a reference frame, causing a Doppler effect due to the relative motion between the second noise port (10102) and the noise source. This results in a frequency shift in the transmission or reception frequency relative to the reference frame. The frequency shift of the second noise port (10102) relative to the reference frame is controlled by changing the speed of the periodic motion. The reference frame includes an inertial reference frame and a non-inertial reference frame. This invention addresses the technical deficiency of existing general-purpose silencer technology, which suffers from the invariability of silencing characteristics due to limitations in material properties or structural design. It realizes a new type of silencer with variable silencing characteristics, namely, a frequency shifting device, silencing equipment, and method based on the Doppler effect.

This application relates to the field of power grid voltage control technology and relates to a PLL-based frequency controller and frequency control method. The purpose of this application is to address the problems of complex control and high switching risks associated with existing islanding detection algorithms combined with mode switching logic. This application generates a first frequency correction value based on the q-axis component of the common coupling point voltage; generates a second frequency correction value using the deviation between a fixed frequency reference and the real-time output frequency of the phase-locked loop (PLL); and synthesizes the first frequency correction value, the second frequency correction value, and the rated angular frequency to correct the PLL output frequency. By superimposing the correction value at the frequency output terminal to achieve feedforward compensation, the frequency deviation generated by the PLL automatically switches to dominate the frequency correction stage during off-grid operation, enabling the PLL to automatically adapt to both grid-connected and off-grid operating states.

The application discloses a musical instrument tone color conversion method based on time-frequency feature refinement, which comprises the following steps: tone color feature extraction is performed on a musical instrument audio data set to establish a target tone color feature library; according to the time domain feature of the target musical instrument tone color, base frequency adjustment, tone length modification, time domain amplitude modulation and pitch synchronous interpolation are performed on the single tone audio to be converted to realize time domain feature conversion; according to the frequency domain feature of the target musical instrument tone color, the harmonic energy ratio and the fractional harmonic energy ratio of the single tone audio after the time domain feature conversion are adjusted to realize frequency domain feature conversion; the single tone audio with the target musical instrument tone color can be converted through the time-frequency feature conversion; and tone color conversion is performed on all single tone audios of the target musical instrument. The application realizes a target musical instrument tone color conversion method capable of extracting transition tone color.

This invention provides a dual-mode frequency-hopping communication system based on module multiplexing, relating to the field of wireless communication technology. The dual-mode frequency-hopping communication system of this invention includes a first transmitting end comprising an input control module, a second transmitting end comprising a pseudo-random sequence-based frequency-hopping communication subsystem, and a third transmitting end comprising a differential frequency-hopping communication subsystem; the first receiving end comprises a second receiving end comprising a pseudo-random sequence-based frequency-hopping communication subsystem, a third receiving end comprising a differential frequency-hopping communication subsystem, and an output control module; this invention transmits baseband data to different subsystems to generate communication signals according to control signals input by the transmitting host computer; and selects the corresponding subsystem to receive and demodulate the communication signals according to control signals input by the receiving host computer to obtain baseband data. This invention combines pseudo-random sequence-based frequency-hopping communication and differential frequency-hopping communication functions, improving the flexibility and environmental adaptability of the communication process and effectively saving hardware resources.

The invention discloses an AI-based frequency bin coding measurement equipment-independent quantum key distribution method. The method comprises the following steps executed by a computer system: inputting quantum signals sent by two communication parties, a relative radial speed between a communication node and an infeasible relay node and historical quantum interference statistical characteristic data; the method comprises the steps of quantum channel observation and frequency bin quantum state construction, frequency bin dynamic evolution caused by relative motion, frequency compensation decision based on reinforcement learning, influence of residual frequency errors on quantum interference performance, frequency bin utilization rate and error code propagation caused by interference degradation and safe key rate generation. The adaptive capacity and the operation reliability of the MDI-QKD system based on the frequency bin in a dynamic and multi-noise environment can be effectively improved, and an intelligent solution is provided for safe key distribution in a high-capacity quantum communication network.

The application discloses a dual three-phase motor current harmonic suppression method and device, the method comprises the following steps: two three-phase half-bridge inverters are used for control in a dual three-phase motor system, wherein the voltage harmonic distribution of two-level space vector pulse width modulation includes the base frequency and the base frequency multiple frequency of the switching frequency; the proportional-integral parameters of the dual three-phase motor system are determined, and the disturbance loop impedance is analyzed and calculated, and in the first-order system of the dual three-phase motor current loop, a first-order low-pass filter is used in series with the motor, wherein the first-order low-pass filter is located between the three-phase half-bridge inverter and the motor; a proportional-differential controller is added before the proportional-integral controller, the first-order low-pass filter added on the d-axis current loop is offset, and the transfer function of the dual three-phase motor system is used for control.