89 results about "Harmonic interference" patented technology

The invention relates to the technical field of power systems, and discloses a voltage regulation system of reactive power compensation equipment, which is characterized in that harmonic interference is filtered and eliminated through a voltage reactive power sensing unit, and accurate power grid parameters are acquired; a load trend pre-judgment unit analyzes the historical load curve and the real-time change trend to generate a future pre-judgment signal; the dynamic compensation calculation unit combines the current power grid state with the prediction to calculate the optimal compensation capacity and generate a switching instruction, after the hybrid switching actuator receives the instruction, a thyristor is triggered firstly to realize inrush current-free conduction, a contactor is switched to maintain low power consumption after the current is stable, and meanwhile, the compensation state monitoring unit performs closed-loop adjustment on parameter deviation, so that the optimal compensation capacity is obtained. The multi-dimensional protection unit prevents overvoltage, overcurrent and overheating, the double-path power supply guarantees continuous operation when the main power supply is abnormal, the intelligent communication unit realizes data uploading and remote cooperation, quick response switching of reactive compensation equipment and guarantee of safety of a large-scale power grid are realized, and inrush current impact in the switching process is effectively inhibited.

The invention relates to the technical field of power system court management, and particularly discloses a court identification and user binding method based on a special transformer acquisition terminal, which comprises the following steps: separating harmonic interference generated by start and stop of an electric welding machine through a kurtosis index and time-frequency energy entropy fusion detection method, and extracting a fundamental voltage and a pure power signal; constructing a dynamic time bending model containing phase consistency and gradient feature constraint based on the fundamental wave voltage, and calculating voltage track similarity to judge electrical coupling; for the users with electrical coupling, dynamic weight power cross-correlation analysis is fused to generate a comprehensive decision value, and a space-time diagram neural network is utilized to update a transformer area topology structure online in combination with a historical topology change event, so that the dynamic determination of the transformer area to which the users belong is realized; through multi-dimensional feature fusion and anti-interference algorithm design, the problems of phase deviation and waveform distortion caused by electric welding machine harmonic waves are reduced, and the transformer area identification accuracy and real-time performance are improved.

The invention relates to the technical field of on-line monitoring, in particular to an insulation fault on-line monitoring method and system for a medical IT system control cabinet. The method comprises the following steps: selecting a non-integer frequency multiplication detection frequency according to equivalent ground distributed capacitance in a previous monitoring period, and superposing the non-integer frequency multiplication detection frequency with a fundamental frequency to form a composite signal injection system; collecting signals to calculate a voltage instantaneous harmonic distortion rate change gradient, and selecting a time window to split the leakage current according to the change gradient; on the basis of dispersion estimation signal-to-noise ratio weighted fusion current vectors, insulation resistance and distributed capacitance are calculated; constructing a four-dimensional original feature vector composed of the insulation parameter, the phase difference and the intermodulation component energy; constructing a diagonal weighting matrix based on the resistance-capacitance ratio and the gradient to transform a feature vector, and determining the fault attribution through the Mahalanobis distance calculation with the fault template library. According to the scheme, harmonic interference can be avoided, calculation stability can be improved, insulation instantaneous sudden change can be quickly responded, and different fault types can be accurately distinguished to guide maintenance.

The invention provides a hysteresis loop analysis method for a transformer no-load loss test, and belongs to the technical field of transformers. Exciting voltage and current signals are collected in a transformer no-load state, and an active filter is used for carrying out digital filtering processing to eliminate harmonic interference; a data corresponding relation between magnetic flux density and magnetic field intensity is established through a digital integration algorithm and a magnetic field intensity calculation formula to form original hysteresis data, the original hysteresis data is processed by using a hysteresis loop optimization model, a complete hysteresis loop curve is generated, and the hysteresis loop area is calculated. According to the hysteresis loop area, the hysteresis loss power density is calculated through the iron loss calculation function, the total value of the transformer no-load loss is obtained by combining the eddy current loss calculation result, and the technical problems that the hysteresis loop reconstruction precision is not high and the complex hysteresis phenomenon cannot be adapted in the transformer no-load loss test are solved.

The invention belongs to the technical field of motor control, and particularly relates to a current harmonic suppression method based on a generalized active disturbance rejection controller. Comprising the following steps: S1, establishing a permanent magnet synchronous motor current loop mathematical model containing disturbance, and constructing a d-axis current equation and a q-axis current equation containing disturbance by taking respective current components of a d-axis and a q-axis as state variables; s2, defining the lumped disturbance of the d axis and the q axis as an extended state variable, and constructing an extended state observer to estimate the lumped disturbance; s3, constructing an improved resonance controller; and S4, establishing an active-disturbance-rejection control law, feeding back the lumped disturbance estimated in the step S2 to the active-disturbance-rejection control law for aperiodic disturbance compensation, and expanding the improved resonance controller in the step 3 and embedding the expanded improved resonance controller into the active-disturbance-rejection control law for periodic harmonic compensation. According to the invention, harmonic interference generated in the operation process of permanent magnet synchronization can be suppressed, so that the robustness of a motor control system is improved.

The invention discloses a power distribution network reliability intelligent analysis method and analysis system, particularly relates to the technical field of power system fault detection, and is used for solving the problems of misjudgment and missed judgment caused by fault feature weakening and harmonic interference in a bidirectional power flow scene in an existing method. The method comprises the following steps: firstly, synchronously collecting fundamental wave and harmonic components of nodes of a power distribution network, extracting a current amplitude change rate and a phase offset by adopting time-frequency domain conjoint analysis, and generating dynamic distribution characteristics by combining harmonic energy clustering; identifying high-frequency interference components in a bidirectional power flow mode by quantizing a phase deviation direction and harmonic energy aggregation characteristics; based on a harmonic frequency band coupling effect and a current dynamic association relationship, an adaptive detection threshold function is constructed, and accurate separation of fault features is realized; and finally, combining a real-time fault judgment result with historical repair data to generate a reliability evaluation parameter. And the sensitivity of fault detection and the rationality of reliability evaluation in a complex operation environment are remarkably improved.

The invention relates to the technical field of electrical safety, and particularly discloses an arc fault protection method based on a circuit breaker intelligent algorithm, which comprises the following steps: S1, collecting a line current signal in real time, eliminating harmonic interference of a frequency converter from an original signal through an anti-aliasing filter, and converting the original signal into a digital signal; s2, processing the current signal by adopting a three-stage cascade wavelet analysis module, and outputting a dynamic peak-to-average ratio to S4; s3, detecting current disturbance based on a double-slide-rail window, outputting a disturbance positioning mark and a time-frequency feature to S4, judging a disturbance event, and positioning a starting point; s4, receiving the dynamic peak-to-average ratio of the S2 and the disturbance positioning mark and the time-frequency characteristics of the S3, performing path processing according to a characteristic analysis result, and adopting a direct interruption method and an electromagnetic radiation-current frequency domain cross validation method; s5, constructing an electric arc energy accumulation prediction model; according to the invention, the problems of weak arc leak detection, electromagnetic interference maloperation and delay are solved.

The invention provides a frequency interference processing method, electronic equipment and a storage medium, and the method comprises the steps: obtaining the current working frequency band information and current signal state information of a baseband communication module in a target communication chip, and obtaining the current working frequency and frequency information of a memory in the target communication chip; according to the current working frequency band information and the frequency information, a non-interference frequency library corresponding to the memory is determined, and the non-interference frequency library comprises at least one non-interference frequency; and determining a target working frequency of the memory according to the non-interference frequency library, the current working frequency and the current signal state information. The problem that the sensitivity of the baseband communication module is interfered by the harmonic of the memory is solved.

The utility model belongs to the technical field of electronic circuit, especially relates to a passive low harmonic frequency converter special for rail transit air conditioner. The frequency converter includes: passive filter module, rectifier module, precharge module, voltage-sharing filter module, inverter module and control module. The input end of passive filter module is connected to the output end of alternating -current source, and the output end is connected to the input end of rectifier module, and the output end of rectifier module is connected to the input end of precharge module, the output end of precharge module is connected to the input end of voltage-sharing filter module, the output end of voltage-sharing filter module is connected to the input end of inverter module, and the output end of inverter module is the voltage output end of passive low harmonic frequency converter special for rail transit air conditioner, and inverter module and control module are connected through inverter control and protection circuit. The utility model can reduce the harmonic interference of frequency converter inverter to input power grid, protects the electrical equipment on power grid, and improves the security of operation.

The application relates to a high-voltage power-taking capacitor protection and harmonic suppression system and a circuit thereof, and belongs to the field of power distribution network intelligent control switch power taking. The circuit is arranged between an isolation transformer and a feeder terminal unit (FTU), and comprises an input protection circuit for suppressing input surge overvoltage and fast pulse group, a harmonic filter circuit for filtering out harmonics, a signal acquisition and conditioning circuit for converting an alternating current signal into a direct current voltage signal, and a control protection circuit for comparing the direct current voltage signal with a preset reference voltage. The system further comprises a high-voltage capacitor voltage divider, an isolation transformer and the feeder terminal unit (FTU). The application effectively solves the problem that harmonic interference, surge impact and overvoltage risk coexist in the high-voltage power-taking system, greatly improves the safety and reliability of the operation of the rear-end FTU equipment under the premise of ensuring the accuracy of voltage signal measurement and power supply continuity.

The invention discloses an operation control method and system of a direct-drive motor, and relates to the technical field of control of the direct-drive motor, and the method comprises the steps: collecting three-phase voltage fluctuation data in real time, extracting a harmonic spectrum in combination with frequency domain analysis, preliminarily estimating the conduction delay and dead-zone compensation time, and increasing dead-zone compensation to form a preliminary optimization parameter when low-order harmonics exceed the standard; and then neutral point deviation, common-mode voltage and three-phase asymmetry degree are evaluated through waveform simulation, finally, a swarm intelligence optimization algorithm is adopted to iteratively adjust a potential balance correction coefficient, conduction delay, dead zone compensation and an interphase time sequence deviation angle to obtain a target time sequence parameter, and a three-phase switch control instruction is generated to be applied to a control system. According to the invention, in the control of the high-power direct-drive motor, the harmonic interference is effectively reduced by optimizing the time sequence design of the switching action, meanwhile, the system risk caused by potential imbalance is avoided, and the operation stability and reliability of equipment are improved.

The application relates to the technical field of direct current transmission systems, in particular to a direct current transmission system operation risk optimization method based on multi-dimensional analysis, wherein the direct current transmission system comprises a rectifier and an inverter, and the specific method comprises the following steps: performing harmonic interference risk assessment on the rectifier; performing power quality risk assessment on the inverter based on the result of harmonic risk control optimization; calculating inverter risk quality indexes based on the result of the power quality risk assessment; and performing inverter risk compensation optimization based on the inverter risk quality indexes. The application realizes the risk assessment of harmonic interference in the rectification process and the power quality risk assessment of the inversion process after interference control optimization, and further realizes more accurate assessment of the operation risk of the direct current transmission system, effectively solving the problem that the harmonic interference risk in the rectification process and the power quality risk in the inversion process are insufficiently related in the prior art.

The embodiment of the application discloses a fault analysis method and related device, and processing equipment can determine the energy band quantity corresponding to the vibration signal to be analyzed first, and the energy band quantity can reflect whether the transformer is disturbed by harmonic interference. In response to the energy band quantity being greater than a preset threshold, the processing equipment can determine that the transformer has received harmonic interference, thereby determining a harmonic interference vibration signal. Then, the processing equipment can determine a harmonic characteristic frequency used to reflect the vibration characteristics of the transformer to be analyzed under harmonic interference, determine whether the transformer to be analyzed has a fault according to the similarity between the harmonic characteristic frequencies corresponding to the plurality of harmonic interference vibration signals, and if the similarity is high, it indicates that the transformer has relatively stable vibration characteristics in a plurality of time periods, and there is a high probability that the transformer has no fault, thereby realizing fault analysis on the transformer disturbed by harmonic interference and accurate judgment on the transformer fault.

The application provides a method and device for evaluating the harmonic interference degree of a converter transformer by using a vibration signal. The method comprises the following steps: collecting multiple vibration signals collected by multiple vibration sensors as vibration samples; obtaining the frequency spectrum of each vibration sample; constructing a discrete frequency spectrum sequence of the vibration sample by using the amplitude of a preset reference frequency and its multiple frequencies in the frequency spectrum of the vibration sample; identifying the effective local peak value of the discrete frequency spectrum sequence of each vibration sample; calculating the energy concentration degree feature and the energy distribution entropy feature of the vibration sample based on the effective local peak value; and finally evaluating the harmonic interference degree of the converter transformer at the current moment according to the energy concentration degree feature and the energy distribution entropy feature of each vibration sample. The scheme evaluates the harmonic interference degree of the converter transformer by using the vibration signal, thereby preventing the converter transformer from malfunctioning due to excessive harmonic interference.

The present disclosure provides a clock radio frequency interference calibration method, device and medium, the clock radio frequency interference calibration method comprising: setting a chip to work at a frequency with clock harmonic interference; optimizing the spatial radio frequency interference of the environment; obtaining the intermediate frequency value of the clock harmonic interference of the digital circuit at the receiver of the analog-to-digital converter based on the initial clock duty cycle, and determining the clock interference energy at the intermediate frequency value; determining whether the clock interference energy at the intermediate frequency value affects the radio frequency sensitivity; when it is determined that the clock interference energy at the intermediate frequency value affects the radio frequency sensitivity, adjusting the clock duty cycle so that the clock interference energy at the intermediate frequency value continues to decrease to no longer change; obtaining the calibrated clock duty cycle. The clock radio frequency interference calibration method provided in the embodiments of the present disclosure can effectively reduce the harmonics of the clock of the digital circuit and reduce the interference of the clock on the radio frequency signal.

The invention discloses a design method of a finite frequency domain H-infinity controller containing an input time delay DFIG, the innovation point lies in setting of finite frequency domain performance indexes, and the design process comprises the following steps: step 1, establishing a model of dynamic characteristics of the DFIG; step 2, designing a finite frequency domain robust controller with a finite frequency domain containing time delay according to the frequency spectrum characteristics of the finite frequency spectrum of the stator current harmonic wave; step 3, solving the design method of the finite frequency domain controller of the DFIG containing the input time delay under the current harmonic wave / gain disturbance; and step 4, conversion of DFIG finite frequency domain controller problem design is carried out. The maximum advantage of the improved controller is that the frequency domain characteristics of harmonic interference signals are considered, so that the designed finite frequency domain controller can suppress the adverse effects of interference and time delay on the DFIG, and the robust stability of the controller can be improved compared with full frequency domain control.

The invention discloses an anti-harmonic current test method for a residual current type electrical fire monitoring detector, and relates to the technical field of detector current measurement. According to the method, the initial residual current and the harmonic state of a detector are monitored firstly, the output interference is analyzed, the qualification is judged, if the output interference is qualified, a high-level proportion signal is extracted, and if the output interference is not qualified, a filter element is adjusted for noise reduction; then, under multi-harmonic superposition, the capturing real-time performance of instantaneous fluctuation of the high-level signal is analyzed, and whether the harmonic frequency is optimized or not is judged to reduce interference; and finally, quantifying the harmonic suppression effect, and judging whether the anti-harmonic current test is completed or not. From initial state monitoring to interference suppression effect quantification and multi-link optimization verification, the anti-interference capability of the detector in a complex harmonic environment is effectively improved, the problem of low harmonic current resistance of the detector is solved, it is ensured that the detector can accurately detect residual current under harmonic interference, and the risk of false alarm or missing alarm of electrical fire is reduced.

The invention relates to the technical field of power control and protection, and discloses a power distribution network frequency following method and device based on frequency spectrum direct current characteristics and a medium, and the method comprises the steps: selecting a plurality of frequency values in a preset frequency band range, determining a corresponding sampling frequency, carrying out the concurrent equal-interval sampling of a band-limited periodic signal through the sampling frequency, and obtaining a plurality of groups of discrete signals; performing differential operation to obtain a plurality of groups of differential signals; executing discrete Fourier transform, and respectively extracting amplitudes of direct current components in transform results to obtain a plurality of direct current component amplitudes; taking a frequency value corresponding to the minimum direct current component amplitude as a measurement result of the band-limited periodic signal fundamental wave frequency; and resetting the sampling interval according to the measurement result of the band-limited periodic signal fundamental wave frequency so as to complete frequency following. According to the method, the fundamental frequency containing the harmonic signal can be accurately identified by analyzing the change characteristics of the direct current component in the discrete Fourier transform, and the problems of inaccurate frequency measurement and following lag under harmonic interference in the traditional method are effectively solved.

This invention discloses a grain depot equipment operation status monitoring and green energy-saving control system, belonging to the field of intelligent grain depot control technology. It collects the instantaneous output frequency and total harmonic distortion (THD) of the variable frequency drive equipment, and simultaneously separates high-frequency noise components higher than the grain temperature change frequency. Based on the output frequency, it determines whether it falls into a sensitive frequency band, and performs causal correlation analysis between the high-frequency noise energy spectrum and the THD to calculate a reliability index. When the reliability exceeds a threshold, it determines that the temperature sampling value is contaminated by harmonics, discards the value, and generates a repaired temperature value based on the heat diffusion law of the grain pile using time-domain prediction or spatial interpolation. The repaired value is used for energy-saving control drive; when a temperature jump and an energy-saving control action are detected to be inversely related, the start / stop command of the variable frequency drive equipment is forcibly blocked. This invention, by identifying and suppressing harmonic interference from the variable frequency drive, avoids reverse control caused by temperature data jumps, ensuring the safety and reliability of energy-saving operation of the grain depot.

The invention belongs to the technical field of geophysical exploration instruments, and particularly discloses a power frequency interference adaptive suppression method and system for a transient electromagnetic instrument. The method comprises the steps of estimating a frequency coefficient of a power frequency signal based on a voltage discrete signal, constructing a recursion model based on the frequency coefficient, and generating a fundamental frequency and a basis function of harmonic waves of each order sample by sample; and performing adaptive estimation on amplitude and phase parameters of power frequency and harmonic interference by adopting a normalized least mean square criterion, reconstructing a power frequency interference signal and offsetting the power frequency interference signal from an original voltage signal, thereby obtaining a transient electromagnetic secondary field signal after power frequency interference is suppressed. According to the method, external reference signals are not needed, power frequency and harmonic interference thereof can be effectively suppressed under the conditions of power frequency fluctuation and strong noise, the influence of power frequency interference on transient electromagnetic response signals is reduced, and the signal-to-noise ratio and stability of transient electromagnetic measurement data are improved.

The invention relates to the technical field of power quality detection of a power grid, and discloses a power grid voltage frequency detection method for suppressing harmonic interference, and the key points of the technical scheme are as follows: topological coding type signal acquisition, heterogeneous topological collaborative anti-interference and fundamental wave extraction, lightweight intelligent adaptive calibration, and intelligent adaptive synchronous interactive output. According to the invention, a full-link cooperative technical scheme of'topological coding anti-interference-heterogeneous cooperative extraction-intelligent adaptive calibration-intelligent adaptive synchronous interactive output 'is adopted, and the purpose of high-precision, high-stability, strong-adaptive and reliable output detection of voltage frequency in a complex power grid environment is achieved.

The application relates to the technical field of electrical safety, and particularly discloses an arc fault protection method based on a circuit breaker intelligent algorithm, which comprises the following steps: S1, collecting a line current signal in real time, eliminating frequency converter harmonic interference of an original signal through an anti-aliasing filter, and converting the original signal into a digital signal; S2, processing the current signal through a three-stage cascaded wavelet analysis module, and outputting a dynamic peak-to-average ratio to S4; S3, detecting a current disturbance based on a double sliding rail window, outputting a disturbance positioning mark and a time-frequency feature to S4, determining a disturbance event, and positioning a starting point; S4, receiving the dynamic peak-to-average ratio of S2 and the disturbance positioning mark and the time-frequency feature of S3, processing according to a characteristic analysis result, and adopting a direct interruption method and an electromagnetic radiation-current frequency domain cross verification method; and S5, constructing an arc energy accumulation prediction model; the application solves the problems of weak arc missing detection, electromagnetic interference misoperation and delay.

The invention relates to the technical field of signal processing, and discloses a high-frequency electrocardiosignal harmonic interference filtering method, device and equipment and a medium, and the method comprises the steps: obtaining object information of a target object and an initial electrocardiosignal under a target lead; determining the initial spectrum intensity of the preset frequency point; determining a target group of the target object; based on the target group reference intensity value of the target group, determining a lead reference value, corresponding to the preset frequency point, of the target object under the target lead; based on the initial spectrum intensity corresponding to the preset frequency point and the lead reference value, whether harmonic interference exists in the initial electrocardiosignal or not is judged; and the electrocardiosignals with harmonic interference are filtered out. By accurately identifying and filtering high-frequency harmonic interference, useful high-frequency details are reserved as far as possible under the condition that the harmonic interference is filtered, the authenticity and effectiveness of electrocardiogram signals are guaranteed, doctors can make more accurate diagnosis, and misjudgment of interference signals on electrocardiogram waveforms is avoided.

The application provides a Coriolis flowmeter inherent frequency detection method, device and electronic equipment. The embodiment uses a sine wave sweep excitation signal with continuous frequency and phase changes to detect the inherent frequency of the Coriolis flowmeter, and eliminates problems such as poor anti-interference performance and harmonic interference caused by using equal-interval square wave signals to measure the inherent frequency of the Coriolis flowmeter. With the vibration characteristics of the flow tube in the Coriolis flowmeter derived, the frequency and phase of the sine wave sweep excitation signal used to drive the flow tube to vibrate are continuously changed, so that the interference of the external excitation signal itself on the flow tube vibration can be directly offset or reduced, the signal-to-noise ratio (SNR) is greatly improved, for example, the SNR is increased from 1db when the flow tube is excited by using equal-interval square wave signals to at least 18db by the method provided in the embodiment, the inherent frequency of the Coriolis flowmeter is accurately detected, and the anti-interference performance is enhanced.

The application discloses a double mixed inhibition type phase-locked loop method based on a generalized second-order integrator, and belongs to the technical field of grid-connected control. The method proposes a double mixed inhibition type second-order generalized integrator phase-locked loop, which can realize double inhibition of low-order harmonic and direct current offset of a power grid. The method adds a harmonic extraction branch on a traditional SOGI structure, and based on a pure harmonic signal output by the branch, the pure harmonic signal is subtracted from an in-phase branch output to generate a signal with higher harmonic suppression capability, so that low-order harmonic interference is significantly weakened. For the problem of direct current offset, the method introduces a high-pass filter and combines a phase compensation link, utilizes signal components in a two-phase rotating coordinate system and an output frequency of the phase-locked loop to perform real-time feedback correction, and thus eliminates the direct current offset and dynamically corrects fundamental phase error. The method has obvious advantages in steady-state accuracy and dynamic response, and can provide reliable synchronization technology support for renewable energy grid connection.

The modulation spectrum adaptive feature purification method based on feature energy entropy reconstruction belongs to the field of underwater acoustic target recognition. The method is used for solving the problem that the existing modulation spectrum feature extraction method cannot solve the influence of harmonic interference on the final estimation result. The method comprises the following processes: in step one, the cavitation noise in the ship radiated noise is demodulated through a plurality of preset demodulation frequency bands, a plurality of demoded signals are obtained, and the optimal demodulation frequency band is selected from the demodulation frequency bands corresponding to the demoded signals by adopting the minimum entropy criterion; in step two, the demoded signal obtained under the optimal demodulation frequency band is decomposed through the VMD algorithm, and the signals of the intrinsic mode functions of all orders are obtained; in step three, the feature energy entropy of the signals of the intrinsic mode functions of all orders is calculated, the feature energy entropy is reconstructed by using the FEER algorithm, and the reconstructed signal is obtained; in step four, the power spectrum analysis is carried out on the reconstructed signal, and the purified modulation spectrum is obtained. The method is mainly used for purifying the modulation spectrum.

The application relates to a ground current harmonic component interference identification method, which comprises the following steps: a differential circuit is designed based on a cable without defects; the differential circuit is used for defect detection of a cable sample loop; and an output signal of the differential circuit is a harmonic component signal caused by defects after elimination of power supply side harmonic interference. The application constructs a power distribution cable sample loop defect harmonic component detection loop suitable for elimination of power supply side harmonics in a laboratory, can eliminate the influence of power supply side harmonics introduced by a power supply and a through core transformer loop on the power distribution cable sample defect harmonic component detection in the laboratory, and improves the analysis efficiency of test detection data.

The invention relates to a harmonic control system, method and device of a variable-frequency power supply and a storage medium, the harmonic control system of the variable-frequency power supply comprises a power module, a main control module, a signal acquisition module and a filtering module, the main control module is connected with the power module, the signal acquisition module is connected with the main control module, and the filtering module is connected with the signal acquisition module. The power module is connected with the filtering module. Through the collaborative architecture of the main control module, the signal acquisition module, the power module and the filtering module, high-order harmonic interference can be effectively suppressed, it is ensured that the output voltage of the variable-frequency power supply is stable, the waveform is smooth, the total harmonic distortion (THD) is strictly controlled within 2%, and the strict requirements of precise industrial equipment, power electronic systems and the like for the quality of the power supply are met.

The invention relates to a superheterodyne control scheme of quantum bits, and aims to solve the problems of spurious frequency, such as local oscillator leakage, harmonic interference, frequency crowding, crosstalk, frequent calibration and the like of a traditional IQ frequency mixing architecture in multi-quantum bit control. According to the controller, through the three-cascade design of the preselection filter, the three-port mixer and the post-filter, the signal purity is effectively improved, the number of control channels is halved, frequent calibration is not needed, the controller is compatible with existing hardware, and a high-stability and low-cost solution is provided for a large-scale quantum computing system.

The invention discloses a Beidou positioning power frequency harmonic interference suppression method and system and a medium, and the method comprises the steps: receiving a mixed radio frequency signal, and carrying out the down-conversion of the mixed radio frequency signal to obtain an analog intermediate frequency signal; converting the analog intermediate frequency signal into a digital intermediate frequency signal sequence; performing multi-layer discrete wavelet transform on the digital intermediate frequency signal sequence to generate an approximate coefficient sub-band and a detail coefficient sub-band; calculating the energy of the wavelet coefficients in all the sub-bands, comparing the energy with an adaptive energy threshold, and identifying an interference dominant sub-band; a self-adaptive threshold function is used for wavelet coefficients in the interference dominant sub-band so as to suppress interference components in the wavelet coefficients, and a processed wavelet coefficient set is obtained; performing inverse discrete wavelet transform on the processed wavelet coefficient set to obtain a reconstructed digital intermediate frequency signal sequence; and performing baseband processing on the reconstructed digital intermediate frequency signal sequence to obtain a Beidou positioning radio frequency signal after interference suppression. According to the invention, continuity and accuracy of positioning in a complex electromagnetic environment can be guaranteed.