446 results about "Linearity" patented technology

The invention discloses a pulse eddy current signal late period slope feature extraction method and system based on segmentation fitting, and belongs to the technical field of nondestructive testing. The method comprises the following steps: performing logarithmic transformation and filtering processing on a to-be-detected eddy current signal; intercepting a characteristic signal segment based on the filtering signal; dividing the feature signal segment into a plurality of sub-segments, performing piecewise linear fitting, determining a linear segment, and extracting a slope as a feature value; repeating the steps to obtain characteristic values of the test pieces with different thicknesses, performing curve fitting according to the characteristic values of the test pieces with different thicknesses and the corresponding thicknesses, and calculating a fitting error; and finally, iteratively optimizing the division number of the sub-segments by taking the minimum fitting error as a target. Through adaptive filtering, segmentation fitting and an intelligent optimization algorithm, the anti-interference performance, the linearity and the measurement precision of pulse eddy current signal feature extraction are remarkably improved, and efficient and reliable thickness detection of the high-temperature and high-pressure industrial pipeline under the condition that a heat preservation layer does not need to be disassembled is achieved.

The invention discloses a linearity closed-loop optimization method for a semiconductor gas sensor with adjustable voltage dynamic compensation, which relates to the technical field of gas detection and comprises the following steps: controlling the semiconductor gas sensor to start in a clean air environment, outputting an initial test voltage sequence through a voltage regulator, the method comprises the steps of collecting sensor reference resistance under different voltages, screening out initial working voltage with the minimum resistance fluctuation quantity, synchronously collecting initial environment temperature and humidity, and calibrating the sensor reference resistance based on preset temperature and resistance coefficients and humidity and resistance coefficients to obtain initial reference resistance. By dynamically adjusting the working voltage and combining real-time compensation on the environment temperature and humidity, the interference of environment factor fluctuation on the resistance characteristic of the sensitive material can be continuously counteracted, so that the linear relation between the output signal of the sensor and the target gas concentration is kept stable, the dynamic optimization of the linearity in a complex environment is realized, and the sensitivity of the sensor is improved. And more reliable basic data is provided for gas concentration detection in an industrial scene.

The invention provides a method for selecting a high-concentration VOCs adsorbent at different temperatures and application, and belongs to the technical field of waste gas governing. According to the method, through testing pore structure parameters of a model adsorption material with concentrated pore size distribution, a static adsorption isotherm and a dynamic penetration curve for VOCs at different temperatures, a high-concentration VOCs adsorbent is obtained; a linear relation equation of the critical aperture and the critical pressure is established through linear fitting, then a correlation equation of the critical aperture, the temperature and the partial pressure is established, and the appropriate aperture distribution range and the model selection standard of the high-concentration VOCs adsorbent at different temperatures are determined by combining dynamic adsorption results. According to the method, the ternary matching relation equation of the VOCs partial pressure, the temperature and the critical aperture is constructed, accurate type selection of the high-concentration VOCs adsorbent at different temperatures is achieved, the pore volume utilization rate and the adsorption capacity can be improved, meanwhile, desorption energy consumption and the VOCs pyrolysis risk are reduced, and a theoretical basis is provided for adsorbent type selection and technical optimization.

The invention relates to the technical field of electronic component testing for investigating or analyzing internal microstructures and physical properties of materials by utilizing an electrical means, and discloses an online testing and analyzing method for physical properties of electronic component materials, which comprises the following steps of: constructing a composite excitation signal formed by linearly superposing a main carrier voltage and a perturbation wave voltage; applying the signal to a to-be-tested electronic component and acquiring response current; and extracting an intermodulation current amplitude at an intermodulation frequency point in the frequency spectrum of which the linear response interval is excluded, calculating a nonlinear response coefficient of the material in combination with the excitation amplitude, and comparing the nonlinear response coefficient with a preset degradation threshold so as to judge whether the nonlinear response coefficient is qualified or not. By extracting intermodulation components which cannot be generated by linear contact resistance, physical isolation of external contact noise in a frequency domain is realized, and the problem that contact resistance fluctuation and material intrinsic aging cannot be distinguished in a traditional linear impedance test is solved.

The invention relates to the technical field of power distribution network automation, and discloses an electrical variable monitoring method for ring main unit operation, which comprises the following steps: acquiring three-phase electrical variable data in response to a condition that a load current change rate exceeds a preset micro-motion excitation threshold value; calculating a reference voltage based on the circuit state equation containing the inter-phase mutual inductance coupling term; the method comprises the following steps: constructing a rotating coordinate system taking a current vector as a reference axis, performing vector decomposition on a voltage deviation vector, separating a resistive temperature drift voltage component parallel to the reference axis, and taking a nonlinear impedance voltage component perpendicular to the reference axis as a monitoring parameter to judge a contact state. According to the method, linear resistance drift caused by conductor temperature rise is effectively decoupled, baseline interference is eliminated, weak nonlinear impedance distortion characteristics caused by mechanical contact degradation can be captured, and the recognition sensitivity and accuracy of early latent faults of the ring main unit are improved.

The invention discloses a multi-branch hydro-generator stator grounding fault active arc extinction method, which comprises the following steps: S1, constructing an analytic function of a double-frequency fault potential by using a neutral point and a generator end voltage after a generator fault and combining a winding connection sequence; s2, deriving a linear constraint relation between a third harmonic fault potential real part and an imaginary part; s3, according to the linear constraint relation, in combination with the potential expression of each branch winding of the third harmonic, constructing a target function for fault solution, and solving a solution set based on the third harmonic characteristic quantity; s4, according to the fundamental wave fault characteristic equation, constructing a fundamental wave difference coefficient multi-solution screening criterion, and obtaining a unique solution of the double-frequency fault potential; s5, aiming at the multi-branch hydro-generator, constructing a neutral point dual-frequency power supply injection amount calculation formula; and correctly adjusting the injection amount of the neutral point double-frequency controllable power supply by using the screened double-frequency fault potential unique solution, and suppressing the voltage of the fault point to be 0 to realize arc extinction. According to the invention, reliable arc extinction of the multi-branch hydraulic generator can be realized.

The invention discloses a temperature compensation equalizer with adjustable equalization slope linearity, and relates to the technical field of microwave integrated circuits. The equalizer comprises a temperature compensation driving module and a temperature compensation equalization module. The temperature compensation driving module generates a control voltage changing along with the temperature by using the negative temperature characteristic of the diode. The temperature compensation equalization module comprises an equalization circuit formed by resonators and a pair of stacked switch tubes, and realizes a temperature compensation function by controlling voltage to adjust insertion loss; meanwhile, by changing the capacitance value of the equalization slope linearity adjusting capacitor C3 which is connected with the series resonator in parallel, the linearity of the equalization slope can be flexibly adjusted on the premise that the equalization quantity is kept unchanged. According to the invention, the temperature compensation and equalization functions are integrated, the structure is compact, the performance is stable, the slope linearity can be flexibly adjusted, and the device is suitable for gain frequency and temperature compensation in a broadband radio frequency link.

The invention discloses a voltage-to-current circuit, a calibration method, a multi-range calibration method and a power supply, a power amplification unit adopts MOS tubes of different channel types to match with working voltages of opposite polarities, and a bias circuit is combined to superpose exclusive bias, so that the waveform adaptation limitation of a traditional circuit is broken through, and the voltage-to-current conversion efficiency is improved. Alternating current, direct current, triangular waves, square waves and other special waveforms can be stably output, and the adaptability is greatly improved; secondly, pure hardware signal transmission and feedback are carried out in the whole process, the intermediate link of MCU measurement-setting is omitted, multi-stage error accumulation is effectively reduced, output delay is remarkably reduced, and the response speed is higher; in addition, the current sampling feedback unit and the error amplification unit form closed-loop control, power amplification output current is sampled in real time and fed back for calibration, and the precision and stability of the output current are effectively improved. Meanwhile, the bias circuit accurately regulates and controls the conduction state of the MOS tube, the linearity and consistency of current output are improved, and the overall structure is simple and reliable.

The invention discloses a resistance voltage divider calibration system, method and device based on a self-calibration frequency counter and a medium, and relates to the technical field of metering calibration. The system comprises a stabilized voltage source, a resistance voltage divider, a high-speed electronic switch, a voltage-frequency converter, a self-calibration frequency counter, a satellite signal receiver, an electric energy metering chip and a CPU. According to the invention, the output signal of the voltage divider is connected to the voltage-frequency conversion channel through a specific time sequence, the pulse sequence in proportion to the voltage is generated by using the inherent linear characteristic of the output signal, then the pulse sequence is subjected to high-precision counting and comparative analysis through the self-calibration frequency counter, and finally the dynamic correction of the voltage division ratio parameter is realized. According to the technical path, an external reference source and high-precision voltage measurement equipment do not need to be introduced, in-situ calibration of the characteristic parameters of the voltage divider can be completed in a remote mode, and the long-term stability of the high-voltage electric energy metering device in a complex electromagnetic environment is remarkably improved.

The invention discloses a servo system control method based on frequency domain self-tuning and linear active disturbance rejection, and relates to the technical field of servo control and motor control. Comprising the following steps: based on a mathematical model of a permanent magnet synchronous motor, establishing a double-inertia model suitable for a large-inertia servo system, and constructing an equivalent mathematical expression of an electrical and mechanical transmission system; in a three-stage cascade control architecture composed of a current loop, a speed loop and a position loop, the current loop is used for current adjustment, the speed loop is used for dynamic response adjustment, and the position loop is used for displacement target tracking. Based on a frequency domain performance index and a rule method, PI controller parameters of a speed loop and a position loop are set respectively, and the frequency domain index comprises an open-loop cut-off frequency and a phase margin; and establishing a frequency domain equivalent mapping relation between the PI controller and the LADRC controller. The method has the advantages that the method does not depend on accurate modeling and manual interference, automatic parameter setting can be achieved, non-overshoot dynamic response is achieved, and the remarkable disturbance suppression capacity is shown.

The invention provides an IGBT (Insulated Gate Bipolar Translator) turn-off time measuring method, system, equipment and medium, and belongs to the field of power semiconductor device testing technology and state monitoring, and the method comprises the following steps: firstly, selecting 20% Vdc and 80% Vdc as turn-off initial measuring points, secondly, carrying out first error correction by adopting a linear estimation method, and finally, carrying out second error correction by adopting a linear estimation method; performing linear fitting on the voltage difference Vce data through a least square method to obtain initial turn-off time; and finally, aiming at systematic deviation caused by inherent concavity and convexity characteristics of the voltage curve, performing secondary error correction by adopting a convex hull algorithm, acquiring a lower envelope line of the ic-tOFF relation curve through an Andriw algorithm, and identifying and eliminating the problem of Overestimation of the turn-off time based on a convex hull accurate point set. According to the invention, accurate measurement of the turn-off time of the IGBT under the condition of low sampling rate is realized, the hardware cost is significantly reduced, and a reliable technical basis is provided for IGBT state monitoring and life prediction.

The invention discloses a high-robustness deadbeat predictive current control method which is suitable for current control of a dual three-phase permanent magnet motor driving system, and belongs to the technical field of permanent magnet motor control. The method mainly comprises the following steps: reconstructing a motor mathematical model by adopting a space vector decoupling matrix and Park transformation to obtain a motor voltage equation under a dqxy axis; designing a linear expansion state observer; a reference value of an output voltage vector is obtained in combination with deadbeat predictive current control; time delay in the digital control system is calculated, and angle delay is compensated; and designing a closed-loop Smith predictor for compensating a time delay link to complete high-robustness dead-beat predictive current control of the dual three-phase permanent magnet motor. The current loop design in the method does not depend on motor parameters, and the method has high parameter change robustness. By introducing the closed-loop Smith predictor, large delay of the system can be effectively compensated, and high-precision current tracking is realized under low switching frequency.

The invention relates to the technical field of power supply management, in particular to a transient response optimization method based on a linear voltage regulator, and the method comprises the steps: obtaining transient response data of the linear voltage regulator when a load suddenly changes, and judging whether the linear voltage regulator enters a transient early warning state or not. And if entering the early warning state, carrying out high-frequency noise threshold segmentation on an output voltage waveform, extracting voltage change rate characteristics, constructing a compensation efficiency model based on dynamic response time and effective compensation bandwidth, calculating an optimal open-loop compensation coefficient, generating a compensation control instruction, and driving a compensation network to carry out dynamic compensation. And if the pre-warning state is not entered, ripple uniformity data of the output voltage is acquired, a deviation matrix of an actual ripple distribution curved surface and an ideal ripple distribution plane is determined, and whether a local ripple abnormal region exists is determined. According to the method, through dynamic monitoring and intelligent compensation, the transient response speed and stability of the linear voltage regulator are improved, and high-frequency noise processing and ripple uniformity are optimized.

A high linearity phase interpolator (PI) is disclosed. A phase value parameter indicative of a desired phase difference between an output signal and an input clock signal edge may be provided by control logic. A first capacitor may be charged for a first period of time with a first current that is proportional to the phase value parameter to produce a first voltage on the capacitor that is proportional to the phase value parameter. The first capacitor may be further charged for a second period of time with a second current that has a constant value to form a voltage ramp offset by the first voltage. A reference voltage may be compared to the voltage ramp during the second period of time. The output signal may be asserted at a time when the voltage ramp equals the reference voltage.

The present application relates to power management technical field, especially to a kind of transient response optimization method based on linear voltage regulator, method includes: obtaining the transient response data of linear voltage regulator when load mutation, judge whether into transient early warning state.If into early warning state, high-frequency noise threshold segmentation is carried out to output voltage waveform, extract voltage rate of change characteristic, construct compensation efficiency model based on dynamic response time and effective compensation bandwidth, calculate optimal open-loop compensation coefficient, and generate compensation control instruction, drive compensation network to carry out dynamic compensation.If not into early warning state, the ripple uniformity data of output voltage is obtained, determine the deviation matrix of actual ripple distribution surface and ideal ripple distribution plane, judge whether there is local ripple abnormal area.The method improves the transient response speed and stability of linear voltage regulator by dynamic monitoring and intelligent compensation, optimizes high-frequency noise processing and ripple uniformity.

The invention discloses a motor multi-parameter identification method based on sampling noise excitation and bias compensation, and the method comprises the steps: firstly obtaining the voltage and sampling current of a motor, and enabling the sampling current to comprise sampling noise; then constructing an information evaluation index, and adjusting a proportional parameter of a current controller to improve the identification information amount; then, shaft voltage feed-forward compensation is constructed to suppress electromagnetic torque pulsation; recursion is carried out by adopting a least square method based on the discrete linear parameterization model to obtain a parameter initial value and a covariance matrix; secondly, estimating offset-containing parameters on line, and calculating a sampling noise variance by using an estimated residual error; and finally, obtaining unbiased parameter estimation according to bias compensation iteration updating so as to output online estimation values of stator resistance, direct-axis inductance Ld, quadrature-axis inductance Lq and permanent magnet flux linkage.

The invention provides a high-power electric heating fused salt heat storage control system which comprises a fused salt electric heating and electric heat tracing device and a central control unit, and the central control unit is directly connected with a core control system for electric heating power dynamic adjustment, fused salt temperature gradient control, electric heat tracing pipeline safety protection and the like. The method comprises the following steps: firstly, based on power grid frequency deviation, generating an electric heating power instruction through droop control and a dead zone link; secondly, establishing a fused salt temperature-flow-power kinetic equation, and identifying a nonlinear surge excitation source; and finally, designing a flexible voltage source type converter control law of the electric heat tracing power supply by adopting an all-drive control theory, directly counteracting a nonlinear term of the system, and converting an original equation into a linear stable system. According to the method, the influence of nonlinear factors on surge and other phenomena is eliminated, the surge problem of small-mass and small-flow fused salt is effectively solved, and the energy efficiency and reliability of the system are improved.

The invention relates to the technical field of pipeline repairing equipment, in particular to a constant tension control system and method of a buried pipeline repairing spiral winding machine. The system comprises a data acquisition module, a tension control module and an execution adjustment module. The safety tension range is calculated through the data acquisition module, the target tension is determined, the tension control module establishes a non-linear relation model fusing the coiling diameter time-varying characteristic and the angle geometric path influence, and a linear decoupling strategy of feed-forward compensation and PID feedback is combined. Core interference caused by rolling diameter reduction and angle change can be actively and speculatively offset, the execution adjustment module optimizes distribution of control resources by accurately mapping a control quantity into a driving signal, model parameters are dynamically and finely adjusted according to the deviation between model prediction and actual output, and feed-forward compensation quantity is reversely corrected. The invention relates to a self-adaptive intelligent system with continuous self-calibration and self-evolution.

The invention discloses a composite anti-interference voltage stabilization control method for a solid-state transformer rectifier stage, and the method comprises the steps: constructing a discrete full-order voltage model of the rectifier stage, and defining internal parameter change and external disturbance as variables to be observed, and enabling the variables to be equivalent to sum interference; designing a full-order stabilization control law to convert the model into a closed-loop system taking a tracking error as a state; constructing an intermediate observer, determining the gain of the intermediate observer by solving a linear matrix inequality so as to estimate sum interference on line, and solving an optimal solution of a quadratic cost function based on an optimal control theory so as to obtain a state feedback gain; and forming a composite anti-interference control law in combination with the interference estimation value and the state feedback gain, and inversely transforming the composite anti-interference control law into actual control input. According to the invention, through active observation and feed-forward compensation of interference, the voltage fluctuation of the DC bus is effectively suppressed, and the robustness and voltage stabilization precision of the system under complex working conditions are improved.

The invention discloses a high-linearity low-noise amplifier based on harmonic suppression, relates to the field of communication and the technical field of electronic devices, and is used for solving the problem that the noise coefficient of an existing Darlington structure is large. Comprising a noise matching and input matching network, a linearity enhancement structure, a negative feedback structure and a pre-distortion structure. Wherein the linearity enhancement structure at least comprises a first amplification transistor and a second amplification transistor which are arranged in parallel, and is used for improving the linearity of the circuit through harmonic cancellation; the negative feedback structure is connected with the noise matching and input matching network and the pre-distortion structure and is used for expanding circuit bandwidth and optimizing output matching; the pre-distortion structure is used for stabilizing the bias voltage of the third amplification transistor. According to the invention, the linearity of the whole circuit is effectively improved, and the source microstrip lines of the two circuits are utilized to improve the minimum noise matching and improve the noise performance. Noise is reduced, linearity is improved, low-frequency gain is suppressed, and bandwidth of the whole circuit is improved.

The invention relates to the technical field of digital filters, and discloses a quantization sensing wide linear minimum error mode adaptive filter, which performs non-uniform low-bit quantization on an input signal and an expected signal by using a quantization parameter to obtain a corresponding quantization value; constructing a linear factor based on the quantization parameter; based on the non-roundness of the input signal, constructing a normalized correlation matrix of the input signal and the linearized error signal, and constructing a compensation matrix in combination with a linear factor; obtaining input signal quantized values at a current moment and a historical moment, constructing an augmented input signal vector, calculating a product of the augmented input signal vector and the compensation matrix, and constructing a corrected input vector; performing wide linear filtering on the corrected input vector to obtain an output signal, and calculating an error signal in combination with an expected signal quantized value; and updating the weight vector at the next moment by using the corrected input vector and the error signal. According to the invention, by introducing a non-uniform low-bit quantization and deviation compensation mechanism, the cost and energy consumption of the analog-to-digital converter are remarkably reduced, and a relatively low steady-state error is kept.

The invention discloses a PT100 temperature measurement circuit and method for multi-gear current fitting resistance measurement and ADC online calibration. In order to solve the problem that a PT100 precise temperature measurement system does not have the self-checking capability, an ADC calibration reference resistance network formed by a plurality of precise resistors is utilized, a plurality of reference voltage points are provided, gain drift, offset change and linear deviation can be detected in real time and compensated, and online self-calibration and state monitoring of an ADC in the whole experiment process are achieved. Through error compensation, the overall error is reduced by about 70%. For a PT100 precision temperature measurement system, a fixed current value is usually adopted to measure the resistance, which is easy to interfere; and due to the influence of self-heating factors, the finally measured resistance value is not accurate, and the like. According to the method, multi-gear constant current excitation and a least square resistance fitting method are combined, noise and nonlinear errors are effectively restrained, the resistance measurement precision and the temperature measurement precision of PT100 are greatly improved, and the temperature deviation is controlled within the range of + / -0.03 DEG C to 0.04 DEG C.

The invention discloses a double-layer nonsingular terminal sliding-mode active-disturbance-rejection control method for a permanent magnet synchronous motor based on a superspiral sliding-mode observer, and the method specifically comprises the following steps: 1, building a voltage equation under an alpha-beta static coordinate system, and then building a mathematical model under a d-q rotating coordinate system through coordinate transformation; 2, designing a fractional order linear super-spiral sliding mode observer; step 3, designing a double-layer nonsingular terminal sliding mode active-disturbance-rejection controller according to the mathematical model under the d-q rotating coordinate system obtained in the step 1; and step 4, making a difference between the mechanical angular velocity given value omega ref and the mechanical angular velocity observed value, and obtaining a control signal of a PMSM current loop through a double-layer nonsingular terminal sliding mode active-disturbance-rejection controller according to the obtained error. According to the method, global rapid convergence of the speed tracking error can be ensured, the anti-interference capability of the system is improved to a certain extent, and buffeting is reduced.

The design method of the non-linear term offset moving-magnet vibrator meets the following conditions: (1) a moving-magnet vibrator body comprises an outer cylinder, a vibration transmission sheet, a stator assembly and a rotor assembly; and (2) the mover assembly is subjected to electromagnetic acting force of pushing force and pulling force in pairs at the same time and presents a push-pull type structural characteristic, so that linear terms in the acting force borne by the mover assembly are overlapped and become larger, and non-linear terms in the acting force borne by the mover assembly are partially or completely counteracted and are reduced, so that the linear terms in the acting force borne by the mover assembly are reduced, and the linear terms in the acting force borne by the mover assembly are reduced. And obtaining the moving magnet type vibrator with the counteracted nonlinear term.

The invention relates to the technical field of power system monitoring, and discloses a cable connection monitoring system based on contact resistance analysis, and the system comprises a signal collection unit which is connected to a cable connection end of a power supply loop and is used for collecting an instantaneous voltage and current sequence and separating an inherent ripple component; the impedance track mapping unit is used for mapping the ripple voltage and the current component to generate a ripple voltage-current response track; the linearity deviation analysis unit is used for calculating a fitting deviation sequence of the track sampling points based on a reference linear model; by analyzing the transient thermal response nonlinear characteristics of the connection points to the high-frequency ripples, the problems that a blind area exists in traditional static resistance measurement and infrared thermal image detection lags behind are effectively solved, and the stability of the static resistance measurement is improved. Therefore, early contact degradation such as loosening can be identified.

The invention discloses a design method of a gallium nitride Hall current sensor, and relates to the technical field of current detection and electric energy metering. The device comprises a magnetic field conversion unit which is configured to convert a measured current into a magnetic field signal which is proportional to the magnitude of the current; and the multi-channel parallel detection unit comprises at least two programmable Hall sensing channels. Through the differential configuration design of the multi-channel parallel detection unit, a closed-loop structure does not need to be introduced, full-range high-precision current measurement can be realized, a small-range sensing channel adapts to a small current interval, the amplitude of an output signal is amplified so as to reduce the zero error proportion, the measurement precision of a rated range interval of 1%-5% is improved, the national standard requirement of electric energy measurement is met, and the electric energy measurement efficiency is improved. The wide-range sensing channel guarantees saturation resistance and linearity of large-current measurement, does not depend on limit performance of a single sensor, improves tolerance of a system to device consistency and zero drift, and reduces a device type selection threshold.

The invention belongs to the technical field of electric power system maintenance optimization, and particularly relates to an electric power circuit day-ahead maintenance plan optimization method considering voltage safety and stability, which comprises the following steps of: constructing an electric power circuit day-ahead maintenance optimization mathematical model by taking minimum unit operation cost and electric power circuit maintenance cost as targets; comprising the steps of setting an objective function and constraint conditions thereof; determining a power transmission line model and an admittance matrix, and then modifying the admittance matrix by adopting a branch addition method to obtain a line switching model based on the branch addition method; and performing staged solution on the line switching model, including three stages of generation and reduction of an uncertain scene, a mixed integer linear main problem and a nonlinear sub-problem, outputting a final solution result, and taking the final solution result as an optimal day-ahead maintenance plan of the power line. According to the method, a maintenance scheme with higher feasibility and robustness is formulated through a reasonable solving strategy, and the overall safety and reliability of a power system are improved.

The invention discloses a linear kick rapid opening and closing control method for an isolating switch, and particularly relates to the technical field of opening and closing control of high-voltage isolating switches. Collecting a linear displacement signal between the conductive arm and the static contact and an electromagnetic driving current change curve, and constructing a kick behavior data matrix; establishing a multi-dimensional state energy threshold model based on the peak acceleration and the zero crossing point; combining a real-time current response curve to complete kick prediction trajectory fitting; fast phase torque compensation is carried out according to the current phase deviation angle, and an active suppression control pulse sequence is generated to realize kick phase locking; a damping recovery coefficient is further calculated based on aftershock feedback, an electromagnetic response factor at the moment of operation is fused, a final control instruction sequence is generated and output to a driving unit, and accurate and high-speed switching-on and switching-off operation is achieved; the method has the advantages of fast control response, strong anti-disturbance capability, high adaptability and the like, and is suitable for accurate control of the isolation switch in various complex power scenes.

The invention discloses a control method of an asymmetric CLLC resonant converter adopting mixed control of track control and PI control. PI control is adopted during steady-state operation of the asymmetric CLLC resonant converter, when input voltage fluctuation is detected, trajectory control is introduced, the frequency of the converter entering the steady state again after the input voltage fluctuation is calculated through the geometrical relationship of a state plane, and steady-state errors are eliminated through a PI controller. The method has the advantages that the combination of the state track control and the linear controller can reduce the voltage change of the output side and shorten the adjustment time when the input voltage fluctuates, so that the problem of severe fluctuation of the output voltage caused by the sudden change of the input voltage when the resonant converter operates is solved, the dynamic performance of the converter is remarkably improved, and the reliability of the converter is improved. Finally, the problems existing in the process of designing the linear controller are solved, the problem of voltage abrupt change of the input side is solved, and the requirements for rapidity and stability are met.

The invention discloses a low-voltage power distribution network topology perception and electricity stealing detection method and system, and relates to the technical field of power distribution network anomaly detection, and the method comprises the steps: receiving measurement data and topology connection relation data, generating a residual equation based on the measurement data, the topology connection relation data and a Kirchhoff voltage law, and obtaining a power distribution network topology perception and electricity stealing detection result; performing approximate fitting on a pre-established linear model based on the measurement data to obtain a line impedance parameter initial value; performing impedance fitting on a pre-established nonlinear least square model based on the line impedance parameter initial value to obtain a reference line impedance parameter; acquiring a distortion data set under electricity stealing simulation, performing approximate fitting and impedance fitting to obtain a current line impedance parameter, calculating a Mahalanobis distance according to the reference line impedance parameter and the current line impedance parameter, and when the Mahalanobis distance is greater than a preset threshold value, judging that the line has an electricity stealing behavior, and if the Mahalanobis distance is greater than the preset threshold value, judging that the line has an electricity stealing behavior. Otherwise, the electricity stealing behavior does not exist, and the detection accuracy of electricity stealing is improved.