19 results about "Signal transfer function" patented technology

The invention discloses an MMC intelligent setting and cooperative control method and system based on deep reinforcement learning, and relates to the technical field of power transmission system regulation and control, and the method comprises the steps: obtaining the current operation state data of a converter in a power transmission system, the current operation state data comprising a system frequency, a frequency reference value, a frequency deviation and a frequency change rate; establishing a third-order active closed-loop small signal transfer function based on an active transient feedback compensation algorithm, and decoupling a damping coefficient and a primary frequency modulation coefficient in VSG control through the third-order active closed-loop small signal transfer function; inputting the current operation state data into the trained DDPG intelligent agent for processing, and obtaining an optimization result of the virtual inertia; the optimized virtual inertia is applied to a rotational inertia control link of VSG control, and self-adaptive adjustment of the virtual inertia is carried out through the trained DDPG intelligent agent; the problem that control parameters of a traditional virtual synchronous generator VSG are fixed and are difficult to adapt to system operation state changes is solved.

The invention provides a Prony algorithm-based cable segment wave velocity acquisition method, device and system, and a medium, and the method comprises the steps: testing a to-be-tested cable, and obtaining a cable signal transfer function; on the basis of the cable signal transfer function, in combination with cable joint distribution, constructing a cable signal approximation function based on a Prony method; constructing a linear prediction model of the cable signal based on the cable signal approximation function; performing denoising processing on the linear prediction model based on a singular value decomposition method to obtain a denoised linear prediction model; solving the denoised linear prediction model to obtain an attenuation coefficient; and calculating the segmented wave velocity of the cable based on the attenuation coefficient. According to the method, the Prony estimation method is combined with the singular value decomposition noise reduction algorithm, high-precision extraction of attenuation constants and segmented wave velocity decoupling are achieved, and then the electrical distance positioning precision is improved.

The invention relates to a noise control method, device and system and a program product, and relates to the technical field of noise reduction. The noise control method comprises the following steps: determining a second original noise signal of a target position according to a first original noise signal of a sound receiving position of the mechanical equipment and a first signal transfer function between the sound receiving position and the target position of the mechanical equipment; determining an error noise signal of the target position according to the second original noise signal of the target position and the noise control signal of the target position; according to the error noise signal of the target position, the coefficient of a noise reduction filter is updated until the error noise signal of the target position is zero, and the noise reduction filter is used for generating a noise control signal, corresponding to a source noise signal, of a sound loudspeaker position of the mechanical equipment according to the source noise signal of the mechanical equipment.

The invention discloses a circulating ball type electric power steering gear control method and system, and relates to the technical field of automobile steering control, and the method comprises the steps: constructing and storing a power mapping model, a safety threshold model and a signal transfer function model; each influence parameter numerical value is obtained in real time, and whether each influence parameter numerical value meets the numerical value range limitation of a safety threshold model is judged; if the limitation is met, a single control mode is executed; a first control loop confirms a target power-assisted current value based on a power-assisted mapping model and in combination with each influence parameter numerical value and then outputs the target power-assisted current value; the second control loop analyzes and obtains the corresponding control deviation rate of each control node in the first control loop under each influence parameter numerical value condition; the first control loop and the second control loop output a first power-assisted current value and a second power-assisted current value respectively, and then the first power-assisted current value or the second power-assisted current value is selected as a target power-assisted current value, and by means of the scheme, the steering power-assisted precision can be remarkably improved.

A far-field muffling self-calibration method for an electronic device is disclosed, comprising: controlling the first speaker and the second speaker to play a first audio; obtaining a first frequency response curve through a sound signal acquired by the first microphone; judging whether a far-field muffling for the electronic device is qualified based on the first frequency response curve; if not qualified, adjusting a first transfer function and / or a second transfer function based on a first preset calibration rule, and returning to execute said controlling the first speaker and the second speaker to play the a same first audio; wherein the first and the second transfer functions represent sound signal transfer functions respectively from the first speaker and the second speaker to the first microphone.

The present application relates to the technical field of visible light communication, and particularly relates to a LED fine feature extraction method, a LED individual identification method and a system in visible light communication, a signal transfer function model is constructed based on an LED equivalent circuit, and coefficients in the signal transfer function model are represented by equivalent parameters of components in the LED equivalent circuit; rising edge data in the visible light communication is extracted and preprocessed; the preprocessed rising edge data is taken as response data of a step input in the visible light communication, corresponding time domain signal transfer function model output is taken as measurement data of the step input in the visible light communication, the signal transfer function model is fitted based on the rising edge data and through a nonlinear least square algorithm, and the optimal coefficient solution is taken as a LED fine feature vector in the visible light communication. The present application avoids complex circuit parameter solving, and uses step response fitting fingerprint parameters, and can be used in security enhancement fields such as security authentication, intrusion detection and access control of an unmanned system based on optoelectronic devices.

A circuit for driving digital-to-analog converter (DAC) comprising a serializer configured to combine multiple signals to one input signal to drive a forward inverter coupled to a first node with a first impedance in serial configuration and a first capacitance in shunt configuration. The circuit includes a chain of inverters coupled in series to transfer the input signal from the first node to the fifth node based on a signal transfer function. The circuit further includes a feedback inverter between the third node and the first node to form a feedback loop with two inverters in the chain, adding peaking in the signal transfer function at the first node. A second feedback inverter can be added between the fifth node and the third node to add peaking in the signal transfer function at the third node. The feedback inverter is designed as a current-starved inverter in order to alleviate hot-carrier injection (HCI) aging of the transistors and add programmability in the peaking. The circuit includes a DAC switch coupled to the fifth node.

In one or more embodiments, a continuous time delta-sigma modulator (CTDSM) includes one or more integrators and includes one or more of a feed-forward loop or a feedback loop, and includes one or more capacitive feeds such that a signal can be inserted at an output of the one or more integrators. A coefficient of one or more of the feed-forward loop, the feedback loop, or the capacitive feed may be configured to shape a signal transfer function of the CTDSM. In addition, the capacitive feed removes signal components from the integrator output, such that noise is reduced and power consumed by the CTDSM is reduced. In one or more embodiments, coefficients of the plurality of capacitive feeds may be selected to limit a peak of the signal transfer function (STF) of the CTDSM.

The application relates to the technical field of integrated circuits, and discloses a cascade continuous-time Sigma-Delta modulator capable of resisting out-of-band overshoot, which comprises a first-stage modulator comprising a first-stage integrator and a first-stage quantizer; a second-stage modulator comprising a second-stage integrator and a second-stage quantizer; a first adder used for adding outputs of the first-stage quantizer and the second-stage quantizer in a digital domain and outputting an output signal of the cascade continuous-time Sigma-Delta modulator; a second adder, an input end of which is respectively coupled to an inverted signal of the output signal and an input signal, and an output end of which is coupled to an input end of the first-stage integrator, so as to form a first feedback path; and a third adder, an input end of which is respectively coupled to the inverted signal of the output signal, an inverted signal of the input signal and an output end of the first-stage integrator, so as to form a second feedback path. The double-feedback structure makes the signal transfer function of the modulator have a roll-off characteristic in the out-of-band, thereby effectively suppressing the out-of-band overshoot.

This invention discloses a method for modeling the input impedance of a switched-capacitor DAB-type solid-state transformer, belonging to the field of DC solid-state converter modeling. Based on the switching averaging method and power balance relationship, the equivalent averaging circuit and basic control strategy of the solid-state transformer are derived; a state equation including capacitor voltage and inductor current is established and its steady-state operating point is solved; the state equation is linearized to establish a small-signal model of the power stage and obtain the small-signal transfer function relationship between input and control quantities and state quantities; further, the control block diagram is linearized to construct a small-signal model of the whole machine; finally, the ratio of the small-signal input voltage to the current of the DC bus is calculated to obtain the input impedance model. This invention models from the whole machine level, overcoming the shortcomings of traditional cascaded port equivalent methods. The model has both high accuracy and good versatility, and is not limited by the specific modulation strategy of the DAB module, providing an effective tool for analyzing the impedance matching characteristics and stability of DC distribution networks.

The application discloses a switch power supply multi-mode control parameter self-adaptive setting method, relates to the technical field of switch power supply digital control, and obtains an input voltage sampling value, an output current sampling value and a switch tube duty cycle and constructs a regression vector, identifies characteristic parameters of a small signal transfer function including an equivalent double pole frequency and a direct current gain on line through recursive least square, takes the characteristic parameters as index coordinates to bilinearly interpolate a target proportional integral derivative parameter group in a pre-stored continuous control parameter surface, continuously transits the current proportional integral derivative parameter group to the target parameter group along a slope transition track, keeps the control quantity continuous through integral item back calculation, obtains an updated duty cycle through operation, and feeds back to form a closed loop, the application replaces discrete segmentation with continuous surface setting, replaces discrete switching with control quantity continuous transition, and eliminates output voltage transient sharp peaks at the discrete switching boundary from the principle level.

The invention discloses an LLC resonant converter self-coupling PI-PI double closed-loop control method, and belongs to the technical field of power electronics. The method comprises the following steps: constructing an LLC resonant converter mathematical model based on a cycle-by-cycle analysis method, and deducing a small signal transfer function of the LLC resonant converter mathematical model; a self-coupling PI-PI double-closed-loop controller is constructed, a self-coupling PI controller is used as a voltage outer loop, and a PI controller is used as a current inner loop; and respectively carrying out parameter setting on the self-coupling PI controller and the PI controller. Compared with the traditional PI-PI double-closed-loop control, the double-closed-loop control strategy based on the self-coupling PI has the advantages that the output ripples are basically consistent in size, and the time and overshoot required for recovering the steady state are reduced under the two transient working conditions that the load suddenly increases and suddenly decreases.

The present application relates to power supply system technical field, disclose a kind of perturbation compensation method of three-phase PFC rectifier under wide frequency input, comprising: establishing the single-phase DCDC model of equivalent three-phase PFC rectifier;The loss characteristics of inductance magnetic core in three-phase PFC rectifier under wide frequency input range is analyzed based on Bertotti model, to revise single-phase DCDC model;Adopt reduced order generalized integrator lock-in loop, determine the input frequency of three-phase PFC rectifier and the disturbance of input frequency are estimated;Using the small signal transfer function between the input frequency disturbance of three-phase PFC rectifier to direct current inductance current, design the feedforward controller opposite to its transfer characteristics;Build extended high-gain state observer, observe the centralized disturbance in system model by the parameter and nonlinear factor changed with input frequency, to design feedback controller, combine to compensate the disturbance of three-phase PFC rectifier.

It is described a computer implemented method for generating a personalized sound signal transfer function, the method comprising: determining first data, wherein the first data represents a first sound signal transfer function, wherein the first sound signal transfer function is associated with a user's ear and with a first sound signal direction relative to the user's ear; determining, based on the first data, second data, wherein the second data represents a second sound signal transfer function, wherein the second sound signal transfer function is associated with the user's ear and with a second sound signal direction relative to the user's ear.

A VSG power decoupling control method and system considering inner loop and line dynamics is disclosed. In this method, the equivalent output impedance function of the VSG incorporating the dynamic characteristics of the inner loop and the dynamic impedance function of the transmission line are established, and then connected in series to obtain the total equivalent impedance function, thereby establishing a nonlinear dynamic equation for power transmission. This equation is linearized at the steady-state operating point to obtain the small-signal transfer function matrix for power transmission. Based on this matrix, a cross-feedforward decoupling branch is constructed and the decoupling coefficient is calculated, while a reactive power steady-state error compensation coefficient is introduced. The internal potential amplitude and power angle signals are acquired in real time, and the decoupling feedforward signal is obtained through weighted calculation. This signal is then superimposed on the reactive power compensation signal at the output of the corresponding control loop to achieve power decoupling control. This application aims to improve the dynamic accuracy and system stability of virtual synchronous machine power decoupling control under large disturbance conditions in weak power grids.

In one or more embodiments, a continuous-time delta-sigma modulator (CTDSM) includes one or more integrators including one or more of a feed-forward loop or a feedback loop and including a one or more capacitive feed-ins to enable insertion of a signal at the outputs of the one or more integrators. The coefficients of one or more of the feed-forward loop, the feedback loop, or the capacitive feed-ins may be configured to shape a signal transfer function of the CTDSM. Additionally, the capacitive feed-ins remove signal components from the integrator outputs, reducing noise and reducing the power consumed by the CTDSM. In one or more embodiments, coefficients of the plurality of capacitive feed-ins may be selected to limit peaking in the signal transfer function (STF) of the CTDSM.

The application is suitable for the field of rocket technology, and provides a rocket elastic frequency identification verification method and a rocket control method.A plurality of frequency angular velocity signals and acceleration signals are collected respectively to determine an angular velocity array and an acceleration array; the signal processing data array of the target rocket is determined according to the angular velocity array, the acceleration array and the preset signal transfer function of the target rocket; the elastic frequency of the target rocket is identified based on the signal processing data array and the preset frequency identification transfer function of the target rocket; the elastic rocket body motion environment of the target rocket is simulated through the simulation platform of the target rocket, the elastic motion control system simulation of the target rocket is carried out by using the control instruction of the target rocket, and the control instruction feedback signal, the elastic attitude angular velocity and the elastic attitude angular deviation curve changing with time are determined based on the simulation control result to perform effectiveness verification. The application is helpful to improve the elastic frequency accuracy.

The invention relates to a power line channel modeling method and device, equipment and a storage medium. The method comprises the following steps: performing physical modeling according to basic attribute parameters and electrical characteristic parameters of a target trunk line channel to obtain a first signal transmission matrix of the target trunk line channel; determining a channel feature vector of the target trunk line channel according to the basic attribute parameter and the electrical characteristic parameter of the target trunk line channel; admittance prediction is carried out by inputting the channel feature vector into an admittance prediction model, and the branch admittance of the target branch line channel is obtained; determining a second signal transmission matrix of the target branch line channel according to the branch admittance; and constructing a signal transfer function of the power line channel according to the first signal transmission matrix and the second signal transmission matrix. By adopting the method, the accuracy of power line channel modeling can be improved.

The invention discloses an unmanned aerial vehicle cluster broadband non-stationary multipath channel modeling method in a low-altitude urban environment. The method comprises the following steps: modeling impulse response of each component of a non-stationary multipath channel of an unmanned aerial vehicle cluster; calculating the speed, the moving distance and the position of each node of the unmanned aerial vehicle; calculating the signal transmission distance and position on each path; doppler frequency shift on each path is calculated; modeling the evolution of the scattering component by using a continuous time Markov process; deducing a signal transfer function and a space-time-frequency correlation function; and deducing Doppler power spectral density. According to the method, the influence of the unmanned aerial vehicle cluster motion parameters on the space-time-frequency correlation function and Doppler power spectral density of the cluster communication channel is comprehensively analyzed, and comprehensive unmanned aerial vehicle cluster channel characteristic analysis can be provided.