81 results about "Harmonic elimination" patented technology

The invention provides a resonance elimination device and method for suppressing ferromagnetic resonance in a power system, and relates to the technical field of power system safety prevention and control. The resonance elimination device for suppressing the ferromagnetic resonance in the power system comprises a resonance elimination module used for consuming energy generated by the ferromagnetic resonance; an acquisition module; the detection module is used for detecting excitation inrush current between the neutral point of the voltage transformer and the high-voltage damping resistor in real time; the calculation module is used for calculating the rising edge slope of the magnetizing inrush current and calculating the offset voltage of the neutral point to the ground; the judgment module is used for continuously judging the relationship between the rising edge slope of the excitation inrush current detected in real time and each threshold value and the relationship between the numerical value of the neutral point to ground offset voltage detected in real time and each threshold value, and judging whether the system has a single-phase ground fault or not; and the control module controls the input of the harmonic elimination module. The resonance elimination device can accurately and quickly eliminate ferromagnetic resonance and effectively improve the resonance elimination efficiency of the ferromagnetic resonance.

The invention relates to a permanent magnet synchronous motor technology, in particular to a permanent magnet synchronous motor vector control method and system based on a current source type inverter. Constructing a self-adaptive harmonic elimination method model, defining a reference signal, obtaining a weight matrix of the reference signal at the current moment based on a given angular velocity and a tracking error of the angular velocity of the rotor of the permanent magnet synchronous motor at the current moment, a self-adaptive gain constant and the reference signal at the current moment; and respectively calculating the error compensation information of the d-axis current and voltage and the q-axis current and voltage at the current moment, and correcting the d-axis current and voltage and the q-axis current and voltage at the current moment based on the error compensation information of the d-axis current and voltage and the q-axis current and voltage at the current moment. Through a novel error correction method, current and voltage compensation measurement errors are corrected, so that the rotation pulsation of the motor is eliminated, and the three-phase current is symmetrically balanced.

The invention belongs to the field of sensors and signal processing, and particularly relates to a wavelet kernel scale sensitivity oriented abrasive particle induced voltage signal noise reduction method, which comprises the following steps: acquiring an abrasive particle induced voltage signal, and carrying out harmonic elimination on the abrasive particle induced voltage signal to obtain a preprocessed signal; constructing a wavelet kernel function, and calculating the wavelet kernel function and the preprocessed signal to obtain a kernel scale guiding spectrum; constructing a sparse joint noise reduction model based on the kernel scale guiding spectrum; processing the sparse joint noise reduction model to obtain a convex optimization objective function; solving the convex optimization objective function by combining a self-adaptive step gradient descent method and a self-adaptive iterative shrinkage threshold method to obtain a weight vector representing the distribution of the abrasive particle characteristic signals; carrying out binarization processing on the weight vector representing the distribution of the abrasive particle characteristic signals to obtain a characteristic indication vector; carrying out Hadamard product on the feature indication vector and the preprocessed signal, and then carrying out low-pass filtering to obtain a noise reduction signal; according to the method, the abrasive particle characteristic signals can be self-adaptively subjected to non-destructive enhancement and noise reduction processing in a strong interference environment.

The invention provides a PT ferromagnetic resonance overvoltage suppression system and method based on graded damping. The system comprises a secondary resonance elimination module, the secondary resonance elimination module comprises a three-stage damping branch circuit which is connected in series with an open triangle of a voltage transformer, the three-stage damping branch circuit comprises a first current-sensitive resonance eliminator, a second current-sensitive resonance eliminator and a fixed resistor which are connected in parallel, and a branch circuit of the first current-sensitive resonance eliminator is connected in series with a first switch; a branch of the second flow-sensitive resonance eliminator is connected in series with a second switch, and a branch of the fixed resistor is connected in series with a third switch; the fan is used for carrying out air cooling on the first flow-sensitive resonance eliminator, the second flow-sensitive resonance eliminator and the fixed resistor; and the control module is used for controlling on or off of the first switch, the second switch and the third switch. Resonance early recognition is achieved through transient energy comprehensive criteria, three-level damping dynamic switching and fan intelligent temperature control are combined, and the three core problems of response lag, insufficient heat dissipation and weak self-adaption in ferromagnetic resonance suppression are solved.

The invention provides a primary resonance elimination device of a power distribution network voltage transformer and a management and control method, and relates to the technical field of voltage transformer resonance elimination. The primary resonance elimination device comprises a primary resonance elimination resistor, a primary resonance elimination power electronic device, a standby resonance elimination resistor and a standby resonance elimination power electronic device; the primary resonance elimination resistor and the primary resonance elimination power electronic device are connected in series and then are connected in series between a neutral point of the power distribution network voltage transformer and a ground wire; the standby resonance elimination resistor and the standby resonance elimination power electronic device are connected in series, one end of the standby resonance elimination resistor and the standby resonance elimination power electronic device which are connected in series is connected with a neutral point of the power distribution network voltage transformer, and the other end is grounded; the primary resonance elimination device further comprises a current transformer and a temperature sensor; the temperature sensor is used for monitoring the temperature values of the primary resonance elimination resistor and the standby resonance elimination resistor; the current transformer is assembled on a line where the primary resonance elimination resistor and the standby resonance elimination resistor are grounded together and used for monitoring the value of current flowing through the primary resonance elimination device.

A voltage synchronizing signal detection method based on an improved DSOGI-PLL is characterized in that a DSOGI-QSG algorithm is adopted in a phase-locked loop, a difference node is introduced on a second-order generalized integrator SOGI structure in the DSOGI-QSG to improve the DSOGI structure, and the improved DSOGI-QSG structure is obtained and can suppress the influence of a direct current component on extraction of each parameter; a specific subharmonic elimination module structure is additionally arranged at the front end of the SOGI structure to serve as a front harmonic filtering cascade module, then the amplitude is corrected through a correction coefficient, and finally filtered signals are input into the SRF-PLL. A cascade harmonic elimination module is constructed in front of the QSG to suppress the distortion harmonic influence, and meanwhile, the QSG structure is optimized, so that the QSG structure can eliminate the direct current amount in the signal, the good characteristics of the traditional DSOGI-PLL are reserved, and meanwhile, the influence of the current bias amount, harmonic distortion and three-phase imbalance of the power grid synchronization signal on the phase locking speed and accuracy can be effectively reduced; and the system performance and applicability are improved.

The invention discloses a resonance elimination method and system based on a PT primary side neutral point connected with a zinc oxide nonlinear resistor, and belongs to the technical field of ferromagnetic resonance suppression in an electric power system. The method comprises the following steps: collecting a real-time zero-sequence voltage amplitude and a real-time zero-sequence current amplitude; obtaining the maximum real-time signal frequency; judging the relationship between the maximum real-time signal frequency and a signal frequency threshold value so as to identify the type of ferromagnetic resonance; and according to the type of the ferromagnetic resonance, selecting and controlling the disconnection or connection of the zinc oxide nonlinear resistor so as to suppress the ferromagnetic resonance. Two zinc oxide non-linear resistance valve plates with different volt-ampere characteristics are connected to the neutral point of the primary side of the PT, the zero-sequence voltage and the zero-sequence current are combined to comprehensively judge and control the power electronic switch to input one resistor, and the purpose of effective resonance elimination is achieved.

The invention discloses a voltage transformer current-sensitive intelligent resonance elimination device and a fault monitoring method thereof, belongs to the technical field of fault monitoring, and aims to solve the problems that a traditional current-sensitive resonance elimination device is unknowable in state, resonance and instantaneous disturbance are difficult to distinguish, the fault identification precision is low, and the operation and maintenance efficiency is poor. The device comprises a flow-sensitive response module and an intelligent monitoring assembly. The current-sensitive response module comprises a response body and a built-in current sensing element; the intelligent monitoring assembly constructs an associated time sequence data set by collecting a real-time electrical signal and a state signal of the current-sensitive response module so as to judge whether the power grid system enters a resonance state; response signal validity calibration and fault identification operations are executed on the flow sensitive response module by constructing a response feature set; the method comprises the following steps: constructing a monitoring data set, extracting evaluation dimensions to perform performance analysis on a flow-sensitive response module, and generating a performance score of the flow-sensitive response module; response monitoring accuracy and operation and maintenance intelligence are remarkably improved, and accurate research and judgment and intelligent operation and maintenance of the resonance state of the power grid are supported.

The invention discloses a frequency-locked loop of a self-adaptive delay signal elimination filter, which comprises a first filter, a second filter, a Park transformation module, a low-pass filter, an amplitude normalization module, an inverse Park transformation module, a frequency estimation module and a low-pass filter, and is characterized in that the first filter is used for eliminating higher harmonics, the second filter is used for eliminating low-order single harmonics, and the amplitude normalization module is used for normalizing the amplitude of the inverse Park transformation module. A signal passing through the filter is converted into a direct current component under a dq coordinate system through the Park conversion module, high-frequency clutter is filtered out through the low-pass filter, then the signal enters the amplitude normalization module, the signal amplitude is standardized to be 1, the signal is recovered into an alternating current signal through the reverse Park conversion module, the alternating current signal is input into the frequency estimation module, and the frequency estimation module estimates the frequency of the signal. And finally, a stable power grid frequency estimation value is obtained after processing by a low-pass filter. The invention aims to eliminate rounding errors and introduce a novel prefilter with relatively small time delay, so that the dynamic and steady-state performance of the first-order frequency-locked loop is improved.

The invention provides an off-line and on-line collaborative optimization MMC harmonic elimination method for harmonic constraint driving, and relates to the technical field of power electronics, S1, generating a switching angle training set and a parameter fluctuation label through clustering analysis and a differential evolution algorithm according to power grid parameters and MMC operation parameters; and S2, extracting harmonic characteristics by using a harmonic detection technology, predicting a switching angle through a neural network, and outputting a final switching angle in combination with a repetitive control link to realize harmonic suppression. According to the off-line and on-line collaborative optimization MMC harmonic elimination method based on harmonic constraint driving, an MMC under a low level number can always keep a low harmonic content level under the complex conditions of different modulation ratios and access to a new energy field station.

The application discloses a kind of harmonic elimination device with self-monitoring function and monitoring method, it is related to harmonic elimination device technical field, it includes two relevant parallel zinc oxide resistance, temperature acquisition module and controller, each zinc oxide resistance branch is in series with disconnecting switch, the controller can control the closing and opening of disconnecting switch, the temperature acquisition module is used to collect the temperature information of zinc oxide resistance, the output end of zinc oxide resistance is arranged to ground, and current transformer is arranged on the ground line of zinc oxide resistance.The application has the effect of facilitating the performance degradation of harmonic elimination resistance monitoring.

This invention discloses a specific harmonic cancellation pulse width modulation method suitable for digital power amplifiers. It involves fitting a periodic signal f(t) to obtain an approximate function g(t) and performing Fourier analysis to derive the Fourier coefficients b of the current. n Wherein, the Fourier coefficient b n With the switching angle sequence α q 'As a parameter; for the switching angle sequence α q 'Optimization is performed to obtain the optimized switching angle sequence α' q According to α q The corresponding circuit is controlled by pulse width modulation to output a voltage waveform with specific harmonics filtered out. This invention obtains a specific switching angle sequence by establishing and solving a system of nonlinear equations. The output voltage waveform with specific harmonics filtered out is then modulated based on this switching angle sequence. This method can generate the desired frequency domain component and eliminate unwanted harmonics. It is also applicable to the design of multiple H-bridge units. At the same switching frequency, this method can output higher-order harmonics than other modulation methods, thus reducing switching losses. Furthermore, its excellent harmonic suppression performance saves hardware costs.

The present invention provides a wiring structure for an outdoor current limiting and harmonic elimination device, and relates to the technical field of wiring for harmonic elimination devices. The wiring structure for an outdoor current limiting and harmonic elimination device comprises a wiring assembly, and the wiring assembly comprises a shell, wherein a wire end processing chamber and a wiring chamber are provided in the shell; the inner wall of the wire end processing chamber is provided with two symmetrically distributed sixth grooves, and cutters are provided in the sixth grooves; on the connecting line of the center points of the two cutters, the two cutters can make a linear motion close to or away from each other; the inner wall of the wire end processing chamber is provided with two symmetrically distributed fourth grooves, and the connecting line of the center points of the two fourth grooves is perpendicular to the connecting line of the center points of the two sixth grooves, and at least one puncture needle is provided in the fourth groove, and the puncture needles in the two fourth grooves are symmetrically distributed in pairs. The device of the present invention solves the problem that the prior art is not convenient for fixing the wire. At the same time, before connecting the wire, the insulation skin at the end of the wire needs to be stripped, which invisibly increases the installation time.

The present invention discloses a modulation method and device for suppressing the common mode voltage in a new energy electric drive system, and relates to the technical field of voltage modulation. The method mainly includes: based on a common mode voltage suppression modulation algorithm, four non-zero voltage vectors for synthesizing a reference voltage vector are determined according to the sector where the reference voltage vector is located; based on the volt-second balance principle, a mathematical expression of the action time of the four non-zero voltage vectors with respect to the reference voltage vector is determined; based on the harmonic flux minimization principle, an action time optimization model is established according to the mathematical expression of the action time of the four non-zero voltage vectors with respect to the reference voltage vector; the action time optimization model is solved to obtain the action time of the four non-zero voltage vectors, thereby calculating the common mode injection voltage to realize modulation. The present invention can reduce current harmonics while suppressing the common mode voltage, and eliminate the common mode voltage spikes and line voltage mutations caused by the traditional modulation algorithm.

The invention relates to the technical field of power system overvoltage protection, in particular to an integrated intelligent resonance elimination device and a resonance and inrush current data transmission and analysis method.The integrated intelligent resonance elimination device is characterized in that a primary resonance elimination module is connected with a current sensing module, and the current sensing module and a voltage sampling module are connected with an intelligent processing module; the intelligent processing module is connected with the wireless communication module, and the self-power-taking module is connected with the primary resonance elimination module; the primary resonance elimination module suppresses ferromagnetic resonance; the current sensing module monitors a flowing current signal in real time; the voltage sampling module collects a voltage signal of an open triangular side of the voltage transformer; the intelligent processing module judges a resonance type and a high-voltage inrush current event and generates a corresponding event record; the self-power-taking module is coupled to the primary resonance elimination loop, takes energy from the primary side and converts the energy into stable electric energy; and the wireless communication module uploads the event record to a remote background system. Therefore, the problems of function separation, hidden danger of operation reliability and the like in the prior art are solved.

The application discloses a 10KV resonance identification and harmonic elimination method, comprising the following steps: S1, collecting open delta voltage, and using different scales to carry out wavelet decomposition on the collected open delta voltage to extract signal components of different frequency bands; S2, establishing a signal component maximum absolute value M matrix according to the extracted signal components of different frequency bands; S3, comparing the signal component maximum absolute values of the frequency bands to complete amplitude, frequency identification and harmonic identification of waveform singularity; and S4, calculating to obtain a harmonic elimination condition and a damping resistance. The application can accurately identify resonance and select a harmonic elimination damping resistance, and has sensitivity and reliability for eliminating ferromagnetic resonance of a voltage transformer.

The invention provides a stability analysis precision method based on an improved phase-locked loop MMC impedance model. According to the improved phase-locked loop structure of the integrated harmonic elimination module, the relation between input and output of an improved part is deduced, and a mathematical model is constructed. Vector expressions of bridge arm equivalent capacitor voltage, bridge arm current and sub-module switching coefficients are obtained through Fourier transform, and an MMC frequency domain steady-state model is constructed. And based on a multi-harmonic linearization method, the model is linearized at a steady-state working point, and a main circuit small signal model after disturbance injection is obtained. And meanwhile, mathematical modeling is carried out on the control system to obtain a small-signal model of a sub-module switching coefficient under disturbance. And solving an alternating current side impedance model adopting the improved phase-locked loop by combining the two types of small signal models. According to the impedance model provided by the invention, the influence of n-order harmonics in the modeling process is effectively eliminated, the precision of the impedance model is improved, and a more reliable reference basis can be provided for stability analysis and parameter design of the MMC system.

This application discloses a method for extracting the DC component of an AC signal, comprising: acquiring the AC signal to be processed and its fundamental angular frequency; sequentially performing low-frequency harmonic elimination processing on the AC signal according to the fundamental angular frequency in descending order of harmonic order, wherein each low-frequency harmonic elimination process is configured to: eliminate the current target low-frequency harmonic, while amplifying the high-frequency noise and higher-order harmonics in the AC signal that have not been eliminated, causing the high-frequency noise and higher-order harmonics to trigger amplitude limiting; after completing a preset number of low-frequency harmonic elimination processes, filtering the obtained signal to extract the target DC component from the AC signal; wherein the amplitude limiting value is set to be significantly higher than the amplitude of the target DC component in the AC signal, so that the amplitude of the high-frequency noise and higher-order harmonics after amplitude limiting is far away from the amplitude of the target DC component. This method can achieve fast and accurate extraction of the target DC component.

The application discloses a parallel MPWM modulation method of 3X harmonic elimination, and relates to the technical field of wireless communication.The method comprises the following steps: based on the principle of harmonic elimination, input baseband signals are decomposed into four phase-controlled baseband modulation signals; the baseband modulation signals are subjected to digital up-conversion to obtain intermediate frequency signals; a parallel optimization module is set in a parallel MPWM algorithm, and the intermediate frequency signals are subjected to optimization processing based on the parallel optimization module to obtain four bit pulse sequence codes; the four bit pulse sequence codes are converted into four two-level radio frequency pulse signals; wherein, the sum of the four two-level radio frequency pulse signals is a required five-level radio frequency pulse width modulation signal, the center frequency of the five-level radio frequency pulse width modulation signal is a carrier frequency, and 3X harmonic is eliminated.The application can improve the signal-to-noise ratio, suppress harmonics, and widen the achievable carrier frequency of RF-PWM.

The invention discloses an outdoor high-voltage vacuum switch, which comprises a wire inlet side voltage transformer pre-embedded in a left insulator and a pluggable wire outlet side voltage transformer mounted on a right insulator, an isolating switch chamber is arranged in the right insulator, an observation window is arranged below the isolating switch chamber, and the observation window is connected with the left insulator and the right insulator. The inner wall of the isolation switch chamber is provided with a thin-wall area, the outer side of the isolation switch chamber is provided with a pressure relief port, and the outer side of the left insulator is provided with a resonance elimination resistor or a zero sequence voltage transformer. An external voltage transformer and an external electricity taking transformer are omitted, and the purposes of simple structure, low cost and small size are achieved.

The present invention provides a method for selective harmonic elimination of an MPUC inverter based on multiverse optimization, and relates to the technical field of pulse width modulation of an MPUC inverter. The method first uses different power supply voltage amplitudes and different modulation controls to produce different output voltage waveforms, and uses five states to trigger the MPUC inverter; then the torque pulsation characteristics of the induction motor powered by the three-phase five-level MPUC inverter are analyzed, and the selective elimination of the influence of different power supply harmonics on the motor torque pulsation is compared and analyzed; finally, the multiverse optimization algorithm is used to search and detect the space through the two processes of exploration and mining to solve the switching angle of the selective harmonic elimination pulse width modulation SHEPWM, thereby realizing the selective harmonic elimination of the three-phase five-level MPUC inverter. The method can effectively suppress the corresponding torque pulsation in the induction motor by selectively eliminating specific time harmonics in the inverter power supply, thereby improving the working stability of the motor.

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 discloses a resonance elimination equipment control method and device and a nonvolatile storage medium. Relates to the technical field of power system control. The method comprises the steps that after n charging piles are connected to a target node of a power grid, the target node is connected to resonance elimination equipment, and the harmonic current and the harmonic voltage of the target node after the target node is connected to the resonance elimination equipment are detected, and the resonance elimination equipment comprises an active power filter; and based on the harmonic current and the harmonic voltage, whether a harmonic elimination strategy of the harmonic elimination equipment is adjusted is evaluated, and the harmonic elimination strategy is used for representing a strategy for controlling harmonic waves generated by the target node. The technical problem that the power supply quality of the charging pile is affected due to the fact that a large number of harmonic waves exist in the charging process of the charging pile for the electric vehicle in the related technology is solved.

The utility model discloses a mounting support of a microcomputer resonance elimination device, which relates to the technical field of microcomputer resonance elimination device mounting and comprises a power distribution cabinet mounting plate, a mounting base and a microcomputer resonance elimination device body, side lug plates for mounting are arranged on two sides of the microcomputer resonance elimination device body, and a moving plate is mounted on the mounting base. A mounting vertical plate is arranged above the front end of the moving plate, the microcomputer resonance elimination device body is mounted on the mounting vertical plate through a mounting assembly, the moving assembly is mounted in the mounting base and used for flexibly adjusting the position of the microcomputer resonance elimination device body, and the mounting vertical plate and the mounting base are connected through an angle adjusting assembly. The inclination angle of the microcomputer resonance elimination device body is finely adjusted. According to the utility model, the microcomputer resonance elimination device main body can be conveniently moved out of the cabinet body through the arranged moving assembly, and the moving plate is driven to slide along the mounting base through the rotation of the movable bracket, so that the whole microcomputer resonance elimination device main body can be conveniently moved out, and maintenance personnel can conveniently carry out maintenance operation on the microcomputer resonance elimination device main body.

1. Name of the Design Product: Prefabricated Cabin for Flexible AC Transmission Converter Valve. 2. Use of the Design Product: For dynamic power regulation, dynamic voltage control, oscillation suppression, and harmonic elimination in AC power systems. 3. Design Key Points of the Design Product: Lies in the shape. 4. Picture or Photograph that Best Illustrates the Design Key Points: Perspective view.

The invention provides a three-level isolation inverter with a modulation optimization function, and belongs to the technical field of electric digital data processing.The three-level isolation inverter is characterized in that system parameters are collected in real time, and a midpoint potential data set and a multi-dimensional matrix model are established; analyzing a midpoint potential change rule based on a physical change equation, and constructing a mapping relation between the switch state and the midpoint potential change; load working conditions are identified, outliers are analyzed, and a compensation strategy under special working conditions is formed; calculating dead zone effect influence and generating compensation parameters; judging a modulation state and optimizing over-modulation area control; solving an optimal switching angle sequence by using a selective harmonic elimination algorithm; and performing fine tuning on the harmonic optimization pulse sequence by combining the midpoint potential variation matrix, the compensation matrix and the dead zone compensation matrix to form a final optimization modulation pulse sequence, thereby solving the technical problem of output voltage quality reduction caused by midpoint potential fluctuation of the three-level inverter in the prior art.

The utility model discloses a dome-shaped diaphragm loudspeaker driver with a novel structure that comprises: a magnetic circuit assembly, a front plate mounted on one (top) side of the magnetic circuit assembly, a top dome-shaped diaphragm protruding from the middle of the top plate, which is being fixed between the front plate and the magnetic circuit assembly. A harmonic eliminator used to eliminate harmful soundwaves or resonances is being placed between the magnetic circuit assembly and the top diaphragm.One end of the harmonic eliminator is installed in the middle of the magnetic circuit assembly; the other (top) end of the harmonic eliminator extends to the inner side of the top diaphragm. The harmonic eliminator is designed with a structured concave-convex sound-absorbing surface for the purpose of eliminating standing waves and deviating harmful sound waves, thereby acoustic distortions. When harmful sound waves are generated behind the top diaphragm, the concave and convex-shaped surfaces on the harmonic eliminator cancel out the harmful sound waves and the remaining ones are guided and then below the harmonic eliminator, so that the harmful sound waves behind the top diaphragm will not be reflected to the top diaphragm.In this embodiment, the harmful sound waves mainly refer to standing waves.

The invention discloses a PT protector suitable for a secondary resonance elimination device, and relates to the technical field of power system protection. The PT protector is connected in series between a PT opening secondary winding and a secondary resonance elimination device, and comprises a protection resistor, an alternating current starting type relay, a time relay and an intermediate relay, and all the parts work cooperatively, so that the normal action and the short circuit fault of the secondary resonance elimination device are accurately distinguished, and mistaken cut-off is avoided; and when the working power supply loses power, the current can still be limited through the protection resistor, so that the problem of short-circuit protection deficiency of the secondary winding of the PT opening is effectively solved.

The utility model discloses an electric power resonance elimination device, which belongs to the technical field of electric power system protection, and is characterized in that a control module is arranged in the device, the control module is connected with a voltage detection module and a switch unit, and the voltage detection module is connected with a primary resonance elimination module and a secondary microcomputer resonance elimination module; the primary resonance elimination module is formed by connecting a plurality of resonance elimination action mechanisms in series; the switch unit respectively controls electromagnetic switches in all resonance elimination action mechanisms in the primary resonance elimination module, the secondary microcomputer resonance elimination module mainly consists of a rectifier, an inverter and a resonance elimination resistor which are connected in series, the rectifier is used for carrying out full-wave rectification on network voltage to form direct-current voltage, the inverter is used for inverting the direct-current voltage to alternating-current voltage, and the resonance elimination resistor is used for carrying out resonance elimination on the alternating-current voltage. An inductor connected in series or in parallel with the resonance elimination resistor is driven to work; and the control module determines the on-state of the switch unit by judging the type and amplitude of the output signal of the voltage detection module.

The present invention discloses a full-scale test device for a voltage transformer harmonic elimination device, comprising: a main unit, comprising a test device main body, wherein the fixed sleeve and the vertical plate are jointly provided with a detection probe; an operating unit, comprising a plurality of first hoop plates, wherein a second hoop plate is provided on one side of the first hoop plate, a connecting assembly is provided between the second hoop plate and the first hoop plate, a symmetrical hollow rod is provided on one side of the first hoop plate, a fixed rod is fixedly connected between the hollow rod and the first hoop plate, a movable assembly is provided between the hollow rod and the connecting assembly, an energy storage assembly is provided in the hollow rod, a push assembly for driving the energy storage assembly is provided on the hollow rod, and a driving assembly for driving the push assembly is provided on the connecting assembly. The present invention inserts a sliding rod into a rectangular opening and pushes it to the right, so that the sliding rod can only move to the right, thereby achieving rapid installation of the voltage transformer, while improving the stability of the device in fixing the voltage transformer and improving the detection accuracy.