1698 results about "Sine wave" patented technology

According to the new energy grid-connected electric energy metering method and device, broadband harmonic characteristic information and inter-harmonic characteristic information are respectively obtained according to preprocessed power grid voltage and power grid current; after the broadband harmonic characteristic information and the inter-harmonic characteristic information are input into the influence analysis topology network, a first error compensation parameter is calculated by using an electric energy metering error output by the influence analysis topology network; based on a non-sinusoidal signal simulation model, combining the preprocessed power grid voltage and power grid current with the step wave signal to obtain a non-sinusoidal wave signal; performing error compensation calculation on the non-sine wave signal to obtain a second error compensation parameter; obtaining time-varying error data of the electric energy meter by using historical operation data of the electric energy meter; a target error compensation parameter is calculated based on the first error compensation parameter, the second error compensation parameter and the time-varying error data of the electric energy meter, the electric energy meter performs electric energy metering based on the target error compensation parameter, an electric energy metering result is obtained, and the accuracy of new energy grid-connected electric energy metering is improved.

The invention provides a hysteresis loop prediction model establishment method and device, electronic equipment and a storage medium, and the method comprises the steps: carrying out a hysteresis characteristic experiment on a ferromagnetic material, setting hysteresis loop related characteristics comprising magnetic induction intensity waveform data and magnetic field waveform data under the excitation of preset sine waves under different magnetic induction intensity peak values, establishing a hysteresis loop prediction model comprising an improved convolutional neural network model and a K-nearest neighbor algorithm model, training the improved convolutional neural network model, inputting a magnetic induction intensity peak value and magnetic induction intensity waveform data, and outputting magnetic field waveform data; and adjusting the magnetic field waveform data based on the feature data by using a K-nearest neighbor algorithm model to obtain a final magnetic field waveform result. According to the method, the hysteresis loop prediction model is established based on the improved convolutional neural network in combination with the K nearest neighbor algorithm, the overfitting phenomenon can be prevented, the training speed is higher, the resource consumption is lower, and rapid iteration and adjustment in practical application are facilitated.

The present application relates to the technical field of micro inverters, and relates to a circuit topology of a micro inverter, and a control method. One specific implementation of the method comprises: measuring the maximum power value of a photovoltaic module, and receiving a current input by the photovoltaic module; acquiring a power grid voltage value in an alternating-current power grid, determining, on the basis of the power grid voltage value and the maximum power value of the photovoltaic module, a sine wave period corresponding to an output current, and on the basis of the sine wave period, controlling on and off of a plurality of switch transistors in a resonance circuit and a voltage doubling rectifying circuit in the micro inverter, so as to respectively form a conduction current loop in the resonance circuit and form an induction current loop in the voltage doubling rectifying circuit; and transmitting the sinusoidal output current to the alternating current power grid by means of the output end of the voltage doubling rectifying circuit. The implementation implements a control strategy for first-stage power conversion of the micro inverter, improves the efficiency of the micro inverter, increases the power of the micro inverter, and reduces the cost of the micro inverter.

The invention relates to the technical field of medical elastography and material multi-scale mechanical measurement, in particular to an elastography method and system based on an instantaneous scattering displacement field, and the method comprises the steps: driving a passive / active method scattering displacement field excitation device through a frequency domain controllable sine wave signal, and generating a scattering displacement field on a target material, an instantaneous displacement field is obtained through high spatial resolution measurement, then sliding window local interception, two-dimensional autocorrelation calculation and nonlinear fitting based on the Rayleigh / shear wave spatial autocorrelation theory are performed on the single-frame instantaneous displacement field, shear wave velocity distribution is obtained, and then the viscoelasticity modulus of a target area is inverted to achieve comprehensive characterization of the viscoelasticity of the material. According to the scheme, the single-frame scattering displacement field is excited and collected, and the elasticity inversion is performed based on the instantaneous displacement field, so that the dependence of traditional elasticity imaging on high-frame-rate equipment is broken through, the material viscoelasticity evaluation can be efficiently completed at low cost, and the application prospect in the fields of clinical diagnosis and mechanical measurement is wide.

According to the power cable multi-defect nondestructive testing method and system based on the broadband impedance spectrum, impedance characteristics of a cable under different frequencies are measured, frequency domain data are converted into time domain data through inverse Fourier transform, and accurate positioning and evaluation of internal defects of the cable are achieved; the invention discloses a power cable multi-defect nondestructive testing method based on a broadband impedance spectrum. The method comprises the following steps: step 1, signal output and acquisition; the method comprises the steps that a broadband impedance spectrum tester is used for outputting a broadband sine wave voltage signal, frequency domain measurement data are collected, and the frequency domain measurement data are impedance data of a cable under different frequencies; 2, carrying out time-frequency conversion; converting the frequency domain measurement data into time domain data through inverse Fourier transform, generating a time-amplitude curve, and analyzing the electrical characteristics of the cable; 3, establishing a defect identification model; analyzing the electrical characteristics of the cable at different frequencies by using the transmission line model, and evaluating the state of the cable; step 4, defect positioning and evaluation; and 5, displaying and analyzing a result.

A displacement-sensing Doppler radar with ultra-low noise and high sensing resolution is provided. The radar includes N two frequency synthesizers to respectively generate, at different frequencies, a transmitted signal that is radiated toward a target object, and a local oscillator (LO) signal. The radar further includes a mixer and a rectifier to: (1) receive a returned signal from the target object carrying phase delays corresponding to detected displacements of the target object; (2) mix the returned signal and the LO signal to generate a down-converted sine-wave intermediate frequency (IF) signal; and (3) rectify the sine-wave IF signal to a square-wave IF signal, which also carries the displacement-induced phase delays. The radar also includes a phase demodulation module to convert the displacement-induced phase delays into a pulse-modulated signal. The radar further includes a low-pass filter to convert the modulated pulse signal into an output voltage signal indicative of the detected displacements.

The invention discloses a tower grounding grid multi-frequency composite wave electric field imaging and soil environment medium diagnosis method, which comprises the following steps of: generating a composite excitation signal through superposition of a low-frequency sine wave and a high-frequency CHIRP square wave, and collecting multi-dimensional data such as voltage / current response, soil temperature and humidity, electric field intensity and the like in combination with a distributed sensor array; separating signal features by using wavelet transform and extracting impedance information of a target frequency point; a multi-grid homotopy algorithm is adopted to realize grounding grid three-dimensional resistivity distribution reconstruction, corrosion spots and abnormal areas are marked, and high-precision positioning of underground conductors is completed through UWB radar or a capacitance detector; meanwhile, based on the information entropy maximization optimization frequency band combination, the grounding grid state is comprehensively evaluated in combination with a multi-parameter fusion model. The method has the non-contact patrol capability, the unmanned aerial vehicle carries equipment to scan the grounding grid, the detection efficiency and convenience are remarkably improved, and an efficient and accurate solution is provided for guaranteeing safe operation of the power grid.

A TinyMaix-based switch cabinet partial discharge detection and identification algorithm comprises the following steps: designing four typical insulation defect models, and respectively simulating corona discharge, suspension discharge, surface discharge and internal discharge; 200 samples are collected for each insulation defect, a sample set of 800 samples is formed in total, and a phase-resolved partial discharge (PRPD) graph is constructed according to a phase value in combination with a power frequency synchronization signal; the method comprises the following steps: dividing a power frequency sine wave into 360 phase windows, calculating a discharge frequency and a discharge amplitude average value in each phase window, constructing pulse counting distribution # imgabs0 # and average pulse amplitude distribution # imgabs1 #, extracting a probability pwin, a mean value mu and a variance sigma, and further calculating 19 statistical characteristics such as skewness Sk; a mean square error is selected as a loss function in each iteration of model solution, model parameters are updated according to the gradient of the loss function, and model convergence is accelerated; and inputting a partial discharge signal to be detected into the trained model, and outputting a classification result of the signal by the model to realize identification and classification of the partial discharge signal.

The invention belongs to the technical field of flow field optical measurement, and particularly relates to a high-enthalpy plasma gas temperature measurement method, system and device based on an absorption spectrum. Generating a composite modulation signal through a high-frequency sine wave and a low-frequency sawtooth wave, and enabling incident light to pass through a flow field measurement area in parallel through laser modulation and beam shaping; the detector receives the transmission light and converts the transmission light into an electric signal containing harmonic information, the signal acquisition device is used for performing signal acquisition, the phase-locked demodulation algorithm is used for extracting second harmonic, and the temperature is inversely deduced by combining the double-spectral-line temperature measurement method and the Fourier coefficient amplitude ratio of the second harmonic with the HITRAN database. The system comprises a signal driving module, a laser emission module, a detection acquisition module and a temperature measurement module. The device is composed of a signal generator, an in-phase adder and the like, and a laser is matched with a driving power supply to guarantee stable work. According to the scheme, aiming at the problems of weak signal absorption and insufficient signal-to-noise ratio under complex working conditions, the measurement accuracy and reliability are improved by composite modulation, harmonic extraction and a bispectral line algorithm, and an effective means is provided for research on thermal characteristics of the high-enthalpy plasma.

The invention provides a current transformer dielectric loss anti-interference measurement method based on a variable frequency power supply, and relates to the technical field of power detection, and the method comprises the steps: constructing an excitation channel, collecting a background response signal, recognizing a main interference frequency through combining a frequency tracking algorithm, and dynamically constructing a frequency deviation parameter; generating a pair of non-power-frequency excitation frequency control variable-frequency power supplies to output sine wave excitation signals; excitation voltage and response current signals are synchronously collected to form sampling signals, notch frequency is set according to frequency deviation parameters, main interference is filtered out, and first processing signals are obtained; performing weighting processing by constructing a window function matched with the frequency band characteristic to generate a second processing signal; the complex amplitude and phase information at the target frequency is extracted, the complex impedance is calculated based on the complex current method, the dielectric loss value of the current transformer is finally output, and the anti-interference capability and precision of measurement are effectively improved. According to the invention, the interference in the dielectric loss measurement of the current transformer can be processed, so that the measurement precision is improved.

The embodiment of the invention provides an excitation signal generation method and system and a digital eddy current sensor, and the method comprises the steps: outputting a square wave signal through a pulse width modulation assembly of a microcontroller unit, and enabling the frequency and resolution of the square wave signal to be adaptive to eddy current probes with different inductance values; inputting the square wave signal into a low-pass filter for filtering, and setting the cut-off frequency of the low-pass filter, the suppression times of higher harmonics and the attenuation slope so as to output a sine wave signal with a target total harmonic distortion range; the amplitude of the sine wave signal is collected in real time, and the pulse width modulation duty ratio and the passband gain of a low-pass filter are dynamically adjusted in combination with a digital control algorithm, so that the sine wave signal is subjected to self-adaptive adjustment and correction and is output; and taking the sine wave signal as an excitation source of an eddy current probe, and driving the eddy current probe to carry out nondestructive testing. According to the invention, the excitation signal which gives consideration to high-frequency signal generation, deep harmonic suppression and digital adaptive adjustment can be generated.

The invention discloses a film capacitor enabling control method and system, a medium and a program product, and the method comprises the steps: determining current sampling data and voltage sampling data of a film capacitor in a first time period; calculating an equivalent impedance sequence within a first time length, and determining distribution characteristics of impedance components under different frequencies; dividing a plurality of frequency band intervals, and calculating an impedance change rate matrix in each frequency band interval; determining energy transmission efficiency, and determining a target frequency band interval; generating a compensation coefficient, and adjusting the amplitude and the frequency by using the compensation coefficient to obtain a target sine-wave voltage; performing energizing processing on the thin-film capacitor by adopting the target sine-wave voltage within the remaining time of the energizing duration, and calculating an instantaneous power factor in real time; and when the stability of the instantaneous power factor reaches a preset condition and the leakage current is reduced below a preset threshold value, generating an enabling completion signal. According to the invention, the adaptability between the energizing effect and the actual demand of the thin film capacitor is improved, and the energizing effect is further improved.

A feature extraction and simulation method for sound signals of an autonomous navigation ship tunnel thruster. A digital filter is used to process measured signals to remove spike signals, and the characteristics of residual wideband floor noise signals are analyzed. A finite impulse response filter is designed, and the impulse response of the finite impulse response filter is convolved with white Gaussian noise, so that simulated noise is matched with frequency-domain characteristics of floor noise signals. A spike signal amplitude is calculated, and a group of sine wave signals having a corresponding frequency are generated as spike signals. Narrowband spike signals and wideband floor signals are superposed and synthesized into simulated tunnel thruster noise. A feasible solution is provided for research and analysis of sound signals of a tunnel thruster. The sound characteristics of the tunnel thruster are accurately extracted, a predicted sound level is improved, and a tunnel thruster sound source database is established, thus providing valuable data support for signal quality analysis of a ship autonomous navigation system, fault diagnosis and improvement of a control strategy for the tunnel thruster.

The invention discloses a magnetic induction intensity detection device based on laser self-mixing interference, which is characterized in that laser emitted by a laser is divided into two light paths after being split by an optical splitter; wherein a polarizing film, a magneto-optical crystal and a transducer are sequentially arranged on one optical path; the transducer is electrically connected with the control module, and the control module generates a continuous sine wave signal to continuously control the transducer; a detector is arranged on the other light path; the detector is electrically connected with the Fourier transform module, and the Fourier transform module analyzes a laser self-mixing interference signal acquired by the detector; the magneto-optical crystal is located in the magnetic field; laser emitted by the laser device is reflected for multiple times between the laser device and the transducer, and laser self-mixing interference is formed under the action of the polaroid. The laser is reflected for multiple times between the laser and the transducer, the Faraday optical rotation effect can be enhanced, the polaroid serves as the polarizer and the polarization analyzer, and the advantages that an external polarization analyzer is not needed, the measurement cost is reduced, and the sensitivity is improved are achieved.

The invention belongs to the technical field of sewage treatment and membrane separation, and provides an in-situ nondestructive membrane pollution detection system and method based on an ultrasonic transmission signal, and the system comprises an ultrasonic excitation module which is used for generating a sine wave excitation signal which penetrates through a membrane body to excite the ultrasonic transmission signal for pollution detection; the signal processing module is used for continuously collecting and preprocessing ultrasonic transmission signals of the clean membrane body and the membrane bodies with different pollution degrees, extracting ultrasonic transmission signal characteristics under different pollution degrees, and establishing a pollution thickness-signal characteristic mapping model; wherein the ultrasonic transmission signal features comprise a time-frequency domain energy gravity center feature and a frequency attenuation spectrum slope feature; and the pollution detection module is used for judging the pollution stage of the membrane body to be detected based on the pollution thickness-signal feature mapping model, and completing in-situ nondestructive membrane pollution detection. According to the technical scheme, the sludge pollution state in the ceramic membrane and flat membrane filtering process can be monitored in real time, and early warning and pollution dynamic tracking are achieved.

The invention discloses a residual magnetism elimination circuit and method for a current transformer, and the method employs a fluxgate principle, applies sine excitation voltage to a secondary winding of the current transformer, extracts a fluxgate signal through a response current, and achieves the detection of the residual magnetism of an iron core of the current transformer. And according to the detected residual magnetism flux linkage information, accurately calculating a voltage parameter required by demagnetization, and generating a degaussing voltage with a specific waveform. And finally, applying the degaussing voltage obtained by calculation to the secondary side of the current transformer, controlling the whole degaussing time to continue at the moment at which the fundamental wave angular frequency can be rotated to + / -90 degrees, and accurately eliminating residual magnetism by utilizing sine waves of a quarter period. According to the method, rapid demagnetization of the iron core of the current transformer can be realized, the reliability and safety of a power system are improved, and demagnetization can be carried out in the running process of the current transformer without offline operation or change of an original transformer structure. The residual magnetism of the iron core is not changed in the detection process, and the normal operation of the current transformer is ensured.

The invention discloses an eddy current displacement sensor sine constant current source excitation method, and belongs to the technical field of sensor measurement and control. The method comprises the following steps: S1, generating positive and negative symmetric reference voltages through a reference voltage source circuit; s2, outputting a square wave control signal with adjustable frequency by the control chip, and driving a switching circuit to generate a square wave taking the positive and negative reference voltage as a level; s3, processing the square wave through a filter circuit to obtain a standard sine wave voltage signal; and S4, converting the sine voltage signal into sine constant current source excitation through a Howland current source circuit, and outputting the sine constant current source excitation to a sensor probe coil. According to the invention, through combination of digital control and analog conversion, the circuit structure is simplified, the cost is significantly reduced, and convenient adjustment of the output frequency and high stability and precision of the output current are realized at the same time.

The present invention belongs to the field of mechanical engineering, and particularly relates to an equivalent model of a knocking kinematic pair of a continuous elastic body and a modeling method thereof. An equivalent model is established for the knocking kinematic pair in a continuous elastic body mechanical structure or system, that is, the non-linear mapping relationship between the knocking pulse force and the knocking initial velocity. By assuming that the knocking force pulse is a half-cycle sine wave, and simultaneously using the Hertz contact model and the origin transfer function or impulse response function of the mechanical structure at the knocking contact point to express the contact mechanical properties of the knocking pair material pair and the impedance properties of the mechanical structure at the knocking part, the relationship between the output and input of the non-linear equivalent model, that is, the knocking pulse force and the knocking initial velocity, is derived. Through the method of the present invention, the problem of rapid prediction of the knocking force pulse of a continuous elastic body mechanical structure can be solved.

The embodiment of the invention discloses an aero-engine rotating speed measuring device which is characterized by comprising a tachogenerator module, a hardware conditioning module, a high-speed A / D conversion module, a data picking and buffering module, a digital signal processing module, a rotating speed measuring module, a power supply module, an operation control module and a communication module which are connected in sequence. The tachogenerator module converts an acquired engine rotating speed signal into a sine-wave-like alternating-current voltage signal of which the frequency and the amplitude are positively correlated with the rotating speed. The hardware conditioning module is used for conditioning the sine-like signal with a relatively wide amplitude range into a signal meeting the amplitude range requirement of the high-speed A / D conversion module; the high-speed A / D conversion module performs high-speed sampling on the conditioned sinusoidal-like signal and converts the conditioned sinusoidal-like signal into a digital signal; the data picking and buffering module is used for picking and buffering the digital signals subjected to A / D conversion; the digital signal processing module is used for converting the digital signal into a digital square wave signal; the rotating speed measuring module is used for monitoring the frequency of the digital square wave signal and calculating the rotating speed of the engine through the frequency; and the communication module is used for uploading the engine rotating speed measurement result to the flight control computer. The technical scheme of the invention solves the problem.

The invention relates to the technical field of wireless connection of conference machine networking. The method comprises the following steps: converting an AP hotspot name and an AP hotspot password into a character string in a preset format, converting the character string into a coded audio signal based on a sound wave coding algorithm, playing the coded audio signal by using host equipment, and sending the coded audio signal to the host equipment; the method comprises the following steps: acquiring a coded audio signal recorded by slave equipment, performing spectral analysis on the coded audio signal by using a fast Fourier transform algorithm to obtain a spectral analysis result, extracting a corresponding sine wave frequency from the spectral analysis result, decoding the sine wave frequency into an AP hot spot name and an AP hot spot password based on a preset frequency character mapping relationship, and sending the AP hot spot name and the AP hot spot password to the slave equipment. And the slave device is connected to the wireless AP created by the host device based on the AP hot spot name and the AP hot spot password, and the slave device sends networking confirmation information to the host device to complete wireless networking. The present invention has an effect of improving wireless cooperation efficiency between devices.

The invention discloses a micro-electromagnetic positioning method and system and a storage medium thereof. The method comprises the steps that sine wave current with fixed frequency sequentially, circularly and alternately passes through three groups of magnetic source micro-electromagnetic coils in sequence to excite sine wave magnetic fields in three dimensions; acquiring magnetic field data information of a positioning target in the sine wave magnetic field, and acquiring the magnetic field data information of the positioning target in the corresponding sine wave magnetic field based on the fact that one group of magnetic source micro electromagnetic coils are electrified each time, the magnetic field data information comprises a three-dimensional magnetic field component sensed by the positioning target in the sine wave magnetic field; fitting the three-dimensional magnetic field component of each dimension, and decomposing the three-dimensional magnetic field component to obtain independent magnetic field signals of three groups of magnetic source micro electromagnetic coils at the positioning target; and obtaining the position and attitude information of the positioning target according to the independent magnetic field signal. According to the invention, three-dimensional sine wave magnetic fields with fixed frequency can be excited circularly and alternately, so that a positioning target can generate three-dimensional data to facilitate positioning calculation. In addition, a function fitting mode is adopted to assist in positioning calculation, after n-point data fitting, the standard deviation of an equivalent magnetic field measurement value can be reduced to # imgabs0 # of a direct measurement result, the signal-to-noise ratio is remarkably improved, superimposed magnetic field signal data with high accuracy are extracted, and the precision of a positioning system can be improved. According to the positioning method, the system is high in anti-interference capability, the calculation result is more accurate, the overall power consumption is low, and the cost is low.

The invention belongs to the field of gear machining detection, and particularly relates to a cylindrical gear ghost order detection method and detection equipment based on tooth surface waviness analysis. The method comprises the following steps: firstly, acquiring tooth surface deviation data of each tooth in a gear, carrying out resampling, inclination error correction and de-modification on the tooth surface deviation data, and then combining the tooth surface deviation data into full-tooth deviation curves in four directions; and then extracting waviness data and generating a full-tooth waviness curve. After RC is carried out on a full-tooth waviness curve, on one hand, the full-tooth waviness curve is converted into a frequency domain signal for selecting a frequency range, on the other hand, spectral analysis is carried out on a waviness signal through an iterative sine wave fitting algorithm within the specified frequency range, sine wave components are extracted, and a corresponding order spectrum is generated. And finally, when a sine wave component of which the amplitude is greater than or equal to 0.02 mu m and which is in a non-integral multiple harmonic order with the tooth number exists in the order spectrum of the target gear, detecting the gear ghost order. According to the invention, the problem of lack of a high-precision and high-efficiency waviness analysis and gear ghost order detection method in the prior art is solved.

The invention discloses a super-flat wire common-winding motor and a design method, and belongs to the technical field of motor design and manufacturing. The invention discloses an equal-pole common-winding axial magnetic flux motor and a design method, the equal-pole common-winding axial magnetic flux motor comprises a motor winding, a stator, a rotor, a casing and the like, and is characterized in that the number of magnetic poles of the stator and the number of magnetic poles of the rotor are equal, all the magnetic poles of the stator or the rotor on the same disc are excited through the same annular coil winding, and the winding can be a conventional round wire, a flat wire or a super-flat wire; alternatively, two or more concentric circle winding units, such as an outer ring winding unit and an inner ring winding unit, can be arranged on the same disc, radially adjacent iron cores can be shared or can also be independently arranged, meanwhile, the radial size of the shared iron core can be wider in consideration of the magnetic saturation problem, or the radial size of the shared iron core can be smaller in consideration of the magnetic saturation problem. The radial sizes of the iron core and the winding in the small-diameter area can be larger; the working principle can be a reluctance type, a switch reluctance type, a permanent magnet synchronous type, a direct-current motor type or an alternating-current motor type; the direct current motor can be a commutator or a plane commutator; or a brushless control scheme; the alternating current motor can be square wave, sine wave or other waveform; the phase difference of the three-phase alternating current can be 120 degrees; or two-phase or four-phase alternating current or other phase difference current with the phase difference of 90 degrees.

The invention relates to a test method and device for examining broadband measurement performance of a capacitor voltage transformer. The method comprises the following steps: frequency response test: acquiring sine wave voltage signals and first output voltage signals output by the capacitor voltage transformer to be tested for multiple times; processing the signals at different frequency points to obtain gain, phase characteristics and steady-state response capability at each frequency point; a square wave signal transmission test: collecting a square wave voltage signal and a second output voltage signal output by the capacitor voltage transformer to be tested; carrying out signal time-frequency domain analysis to obtain rapid voltage change transient response capability and broadband measurement accuracy; an operation / lightning impulse transmission test: collecting a transient operation / lightning impulse wave voltage signal and a third output voltage signal output by the capacitor voltage transformer to be tested; signal processing is carried out, and the response capability and high-frequency measurement accuracy of the transient high-frequency voltage signal are obtained; and the broadband measurement performance is obtained. Compared with the prior art, the method has the advantages of comprehensively examining the broadband measurement performance of the capacitor voltage transformer and the like.

The invention discloses a polycrystalline silicon solar panel intelligent fault detection early warning system and method, and relates to the technical field of intelligent fault detection. The polycrystalline silicon solar panel intelligent fault detection early warning system comprises a power attenuation fault detection module; a hot spot effect fault detection module; and a short circuit fault detection module. According to the invention, power attenuation early warning timeliness analysis is carried out, whether sine wave signal extraction optimization determination and early warning are carried out is determined, then hot spot effect early warning timeliness analysis is carried out, whether hot spot effect optimization determination and early warning are carried out is determined, and finally short circuit early warning timeliness analysis is carried out. According to the method, whether temperature-waveform extraction optimization judgment and early warning are carried out or not is judged, accurate and timely early warning of faults such as power attenuation, hot spot effect and short circuit is achieved, and the problem that in the prior art, fault detection and early warning of the polycrystalline silicon solar panel are not timely due to interference in the fault feature extraction process is effectively solved.

The invention discloses motor control equipment and a motor control method for a sine wave filter. The motor control method comprises the following steps: compensating a current feedback vector output by a driver through a filter state compensator to obtain a motor current feedback signal; a motor current feedback signal and a given signal are synchronously input to a motor controller for operation, a motor stator voltage given vector is obtained and output to a filter state compensator for further processing, and a driver output given voltage vector is obtained and serves as a voltage signal to control the bus voltage of the sine filter. According to the method, only the direct-current bus voltage and the three-phase output current of the driver are collected, the problem of hardware compatibility does not exist, the motor is controlled to run along with the given signal through external filter state compensation, high current control response bandwidth can be achieved, resonance is avoided, and stable running of the motor is guaranteed.

The invention discloses a real-time acquisition and monitoring device for an electrochemical impedance spectrum of a transformer substation storage battery, and the device comprises a waveform generator which is used as a current excitation source and generates a current excitation signal; the switch switching circuit is used for switching the sections of the current excitation signals received by the battery monomers; the sampling circuit obtains response voltage signals of the single battery based on the current excitation signals of different sections; and the control signal processing circuit performs fast Fourier transform on the response voltage signal, and obtains the electrochemical impedance spectrum of the transformer substation storage battery based on the transformed response voltage processing signal. According to the invention, measurement is carried out in a current excitation and voltage response mode, and electrochemical impedance spectroscopy data of the storage battery in a floating charge state can be acquired on line; a current excitation signal is output by adopting sine waves with the same amplitude at a to-be-tested frequency point, so that the problem of errors in a storage battery electric signal impedance spectroscopy test process is solved; the method can be flexibly and conveniently applied to a transformer substation, and reduces the cost of storage battery electrochemical impedance spectroscopy detection.

The invention discloses a multi-parameter adjustable ultrasonic transducer excitation circuit system which is simple in structure and flexible to control. According to the technical scheme, the device comprises a central control module, an ultrasonic waveform generation module, a program control voltage source module and a full-bridge driving module; the central control module at least has a serial port communication function, and receives a parameter setting instruction of an upper computer through serial port communication to control the whole system; the ultrasonic waveform generation module comprises a sine wave generation module and a pulse square wave conversion module, the sine wave generation module generates a sine wave signal with a specified frequency, and then the pulse square wave conversion module generates a pair of square wave waveforms which are opposite in phase and are emitted in a pulse group mode; the waveform basic frequency of the square wave is equal to that of the sine wave, the pulse frequency and width of the pulse train are adjustable, and the pair of inversion signals is used for controlling two half-bridges of the full-bridge driving module.