164 results about "Harmonic mitigation" patented technology

The invention relates to a rectification harmonic suppression control method for a double reverse star transformer. The method comprises the following steps: establishing a rectifier bridge arm phase characteristic parameter table in a control platform, and recording a theoretical conduction phase, winding attribution and waveform synchronization characteristics of a bridge arm; in the operation process of the rectification control unit, the output current of a transformer and the conduction state of a bridge arm are collected, and a rectification operation state data set is generated; and calculating bridge arm conduction phase deviation, and analyzing a corresponding harmonic component to obtain a mapping relation between a bridge arm state and harmonic distribution. And judging whether the current bridge arm configuration meets the phase coverage requirement of the target rectification pulse number or not according to the mapping result, and if not, selecting a standby bridge arm group with a preset phase difference and generating a switching instruction. And the rectification control unit responds to the instruction to lock the current bridge arm conduction path and release the target bridge arm group so as to realize bridge arm resource dynamic reconstruction and rectification performance optimization. Harmonic waves can be effectively suppressed, and the topology adaptability and the output quality of the rectification system are improved.

The invention relates to a coordination method and device for harmonic suppression and reactive power compensation in a power distribution network. The method comprises the steps of obtaining power grid operation parameter information of a power distribution network; according to the power grid operation parameter information, the total current harmonic distortion rate, the power factor and each harmonic current information of the power distribution network are detected; detecting to-be-optimized parameters of the power distribution network according to the total current harmonic distortion rate, the power factor and the current information of each harmonic, the to-be-optimized parameters including at least one of each harmonic and reactive power; and according to the to-be-optimized parameters, suppressing each harmonic in the power distribution network and compensating reactive power in the power distribution network. The method can accurately perform cooperative control on harmonic suppression and reactive power compensation in the power distribution network.

The invention discloses a vector reconstruction harmonic suppression method for a three-level inverter power supply permanent magnet synchronous motor, and relates to the technical field of motor harmonic and noise suppression. Calculating action time of three basic vectors, selecting the three basic vectors, adjusting an original vector synthesis sequence in a single carrier period into a vector reconstruction synthesis sequence, calculating three time nodes of a fifth-segment sequence and a sixth-segment sequence according to the original vector synthesis sequence, and calculating the time nodes of the fifth-segment sequence and the sixth-segment sequence; the action duration of the two basic vectors after adjustment is calculated according to the vector reconstruction synthesis sequence, the numerical value of a switching time node of a three-level inverter switching tube is updated according to the action duration, and the assigned value of a time register is calculated and updated in a circulating mode in the operation process of the permanent magnet synchronous motor system. And generating a PWM (Pulse Width Modulation) driving signal to control a three-level inverter switching tube to drive a motor. Improvement is carried out based on a traditional SVPWM technology, the high-frequency harmonic performance of the three-level inverter and the motor driving system can be remarkably improved, system cost and operation difficulty do not need to be increased, and the method is simple and easy to implement.

The invention provides a network construction type bidirectional low-harmonic energy storage converter based on virtual synchronous control and an intelligent load identification method thereof, and belongs to the field of power electronics. The converter comprises a power module and a control module, wherein the power module is used for bidirectional conversion and output of electric energy; the control module comprises a virtual synchronous control module and a harmonic suppression control module, and the virtual synchronous control module adopts a virtual synchronous generator technology to realize active / reactive power bidirectional adjustment during electric energy bidirectional conversion of the power module and network construction level voltage and frequency support during electric energy output; and the harmonic suppression module is provided with a parallel QPR controller group (comprising a first QPR controller, a second QPR controller and a third QPR controller) which are used for processing third-time, fifth-time and seventh-time characteristic harmonics respectively and suppressing the characteristic harmonics of the electric energy output side of the power module. According to the invention, the dual modules are arranged in the control module, so that the cooperation of a network construction function and low harmonic output is realized, and the electric energy quality and the system operation stability are effectively improved.

The invention discloses a harmonic suppression method and system based on feedforward control and virtual impedance, and belongs to the field of electric energy quality control, and the method comprises the steps: constructing a harmonic extraction model based on the cascading of double third-order generalized integrators, and obtaining a voltage harmonic component based on the harmonic extraction model and real-time power grid data; based on a preset power outer loop control strategy, a preset voltage and current double closed loop control strategy, a preset harmonic voltage feed-forward control strategy and the voltage harmonic component, constructing a network construction type charging pile control model, and obtaining an initial output current; obtaining each virtual impedance based on the initial output current, the harmonic extraction model and the voltage harmonic component; and obtaining a harmonic suppression model based on each virtual impedance and the network construction type charging pile control model, so as to obtain a harmonic suppression output current based on the harmonic suppression model and the real-time power grid data. According to the harmonic suppression method and system based on feedforward control and virtual impedance provided by the invention, grid-connected output current harmonics controlled by a network-forming type charging pile are effectively suppressed.

The invention discloses a harmonic suppression and dynamic reactive compensation control method for an energy router, which is suitable for a micro-grid and a distributed energy access system. According to the method, three-phase current and voltage signals of an alternating current port of the energy router are collected, five-time and seven-time main harmonic components are extracted through fast Fourier transform, harmonic compensation current instructions equal in amplitude and opposite in phase are generated and injected into an inverter to be output, and active counteracting of main harmonics is achieved. Meanwhile, the bus voltage deviation and the change rate thereof are detected, a reactive current instruction is adjusted on line by adopting a fuzzy self-adaptive PI controller, rapid and smooth dynamic reactive compensation is realized, and the bus voltage is stabilized. Decoupling control of active / reactive and harmonic components is realized in combination with Park conversion, and virtual impedance is introduced to enhance system damping and harmonic suppression capabilities. Compared with the prior art, harmonic suppression and voltage support can be simultaneously realized under a single control framework, the response speed is high, the stability is high, and the method is suitable for high-performance grid-connected operation of the multi-port energy router.

The invention discloses a six-phase motor driver harmonic current suppression method based on multi-subspace control, and belongs to the technical field of motor control. In order to solve the problem that low-order harmonic current of a six-phase motor in a z1-z2 subspace is difficult to effectively suppress, the invention provides a scheme that a mathematical model of the six-phase permanent magnet synchronous motor is established, multi-subspace decomposition is carried out, and stator current is divided into a d-q subspace and the z1-z2 subspace; a double-closed-loop control architecture with a speed loop as an outer loop and a current loop as an inner loop is constructed, a d-q subspace adopts a PID regulator to realize fundamental current control, and z1-z2 subspaces realize suppression of fifth and seventh harmonic currents through a parallel structure of PI and a quasi-proportional resonance controller; and a PWM signal is synthesized through inverse transformation and dual three-phase space vector pulse width modulation, and an inverter is driven to realize stable output of fundamental wave energy and harmonic suppression. The method effectively reduces the harmonic distortion rate, improves the operation efficiency and stability, and is suitable for occasions of new energy vehicles, ship propulsion, rail transit and the like.

The invention relates to the field of three-level inversion twin-trawling systems, and particularly discloses a harmonic current suppression method, system and product of a three-phase three-level inversion twin-trawling system, and the method specifically comprises the following steps: S1, a bus voltage balance control step; s101, acquiring a bus voltage error value; s102, acquiring a bus voltage error correction value; s2, a neutral current harmonic suppression step; s201, acquiring a common-mode current flowing through a node connected with the power side and the load side; s202, acquiring a higher harmonic component in the common-mode current; s203, obtaining a higher harmonic component suppression correction value; and S3, superposing the corrected value and a three-phase voltage output modulation wave to obtain a three-phase inverter circuit modulation signal of a power side in the three-phase three-level inverter twin trawling system. The harmonic suppression algorithm of the output current can be provided based on the single-power three-phase dragging system, the cost can be reduced, and the current distortion can be reduced, so that the real current output condition can be simulated.

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

The invention discloses a dual three-phase permanent magnet synchronous motor harmonic suppression method based on virtual back electromotive force identification, and the method comprises the following steps: S1, building a driving system model of a DTP-PMSM; s2, constructing a harmonic model of the DTP-PMSM, analytically decomposing the nonlinear characteristic and the non-sinusoidal counter electromotive force of the inverter into dq and dqz subspaces, introducing the concept of virtual harmonic counter electromotive force, and unifying the nonlinearity of the inverter, the space harmonic counter electromotive force and cross coupling terms related to harmonic current into a single expression form; and S3, developing an identification principle based on current mapping, including amplitude and phase estimation, gain design and delay compensation, so as to estimate the amplitude and phase deviation of the virtual harmonic back electromotive force on line to realize harmonic suppression and avoid a complex algorithm and a large amount of parameter adjustment. According to the method, the operation effect is good in a wide rotating speed range, and meanwhile complex algorithms and a large amount of parameter adjustment are avoided.

The invention discloses a long-time-domain predictive control and undisturbed switching method for a hybrid system networking converter, and belongs to the technical field of power system control. In order to solve the problems of poor dynamic performance and easy impact of mode switching of a grid construction / grid following converter hybrid system under new energy high-proportion grid connection, the method specifically comprises the following steps: constructing long time domain model prediction current control, replacing a traditional PI current inner loop, performing discrete modeling based on a dq coordinate system, performing double-step prediction compensation delay, and updating reference current through Lagrange extrapolation. The current tracking precision and the harmonic suppression capability are improved; designing an undisturbed switching strategy, unifying an alpha-beta coordinate system and a current control loop, locking a switching angle, synchronizing an initial value of an integrator, and dynamically adjusting reference voltage to ensure that variables are continuous; two strategies are integrated in a hybrid framework, and stable operation and smooth switching under strong / weak power grids and transition working conditions are realized. According to the invention, the total harmonic distortion rate of the grid-connected current is reduced to below 0.85%, and the method has the advantages of no voltage and current impact in switching and enhanced stability and flexibility of the power system.

The invention discloses a five-phase permanent magnet synchronous motor current control method based on virtual impedance. Comprising the following steps: obtaining stability boundaries of virtual impedance of each axis in d1-q1 and d3-q3 synchronous rotating coordinate systems, and obtaining optimal virtual impedance of each axis through simulation; according to the optimal virtual impedance of each coordinate axis, obtaining a proportional-integral control parameter; in the operation process of the five-phase permanent magnet synchronous motor, reference currents and actual currents of all shafts in d1-q1 and d3-q3 synchronous rotating coordinate systems are obtained in real time and input into corresponding two-degree-of-freedom current controllers respectively, and control voltages of all the shafts are obtained; and generating a driving signal according to the control voltage of all coordinate axes in the d1-q1 and d3-q3 synchronous rotating coordinate systems, and controlling the five-phase permanent magnet synchronous motor. According to the method, high-performance harmonic suppression and dynamic response optimization control of the five-phase permanent magnet synchronous motor under the influence of multiple odd harmonic currents is realized.

The invention discloses a five-phase permanent magnet synchronous motor harmonic suppression control method based on machine learning, and the method comprises the following steps: S1, constructing a mathematical model of a five-phase permanent magnet synchronous motor drive system in a rotating coordinate system, and designing a five-phase permanent magnet synchronous motor control system based on a deep neural network; and S2, deeply fusing the physical prior information of the motor into a training process to enhance the generalization ability of the model, and proposing a hybrid optimization strategy to improve the fitting precision of the predicted network voltage and the actual working voltage, suppress the fluctuation in the prediction process, and enable the predicted value to better meet the actual operation requirement. The invention overcomes the limitation of the existing dual-plane current control method, and makes full use of the technical advantages of the method.

The invention relates to the technical field of energy storage systems, and discloses a harmonic suppression method and system of an energy storage converter. According to the method, harmonic disturbance generated during switching of the switching state is analyzed based on the voltage modulation instruction and the switching characteristic parameters, so that prospective prediction of voltage harmonics caused by switching action time sequence deviation is realized, and the problem of detection and control delay existing in a traditional method is solved; carrying out credibility evaluation on the obtained prediction information of the voltage harmonic wave based on the real-time current harmonic component and the voltage harmonic wave disturbance prediction quantity, and fusing the real-time current harmonic component and the voltage harmonic wave disturbance prediction quantity based on the result to generate a harmonic wave suppression target with a quick response characteristic and high precision; and a safety voltage control instruction capable of effectively suppressing a harmonic suppression target is obtained through a closed-loop iterative optimization mechanism, so that the inherent contradiction that the harmonic suppression effect and the safety constraint are difficult to consider at the same time is solved, and the comprehensive performance of harmonic suppression is improved.

The invention relates to the technical field of flexible direct current transmission harmonic suppression, and provides a flexible direct current transmission control device with broadband harmonic suppression, the control device integrates inner ring control and harmonic suppression, and the harmonic suppression adopts data collected by the inner ring control to carry out harmonic suppression. Comprising an acquisition module, an inner loop control module and a harmonic suppression module, the acquisition module is used for acquiring power grid data in real time, and the inner loop control module is used for generating original bridge arm modulation waves according to the power grid data acquired by the acquisition module and transmitting the modulation waves to a valve control device for inner loop control; the harmonic suppression module is used for determining harmonic waves needing to be suppressed according to power grid data, generating compensation voltage according to current harmonic components and system impedance, superposing the compensation voltage and original bridge arm modulation waves and sending the superposed compensation voltage and original bridge arm modulation waves to the valve control device, and controlling switching of the converter valve sub-module by the valve control device based on superposed signals. Resonance suppression is realized while inner loop control is performed.

The invention discloses a direct-current bus harmonic suppression method and system for photovoltaic grid connection in an industrial park, and relates to the technical field of harmonic suppression of a direct-current bus of a photovoltaic power supply and improvement of the power quality of a power distribution network, and the method comprises the steps: generating required direct-current output through series voltage boosting and parallel current increasing, constructing a photovoltaic power generation unit, and adding a DC-DC converter, based on MPPT, a three-layer control method is adopted to track the maximum power point and control a DC-DC converter switching device; for a DC-DC converter and a DC-AC inverter, system mathematical modeling and theoretical analysis are carried out, and a DC side current is deduced; and based on the collected DC side current, extracting a specific harmonic component and generating a reverse compensation signal, and injecting the signal into a corresponding DC bus control link for harmonic suppression. According to the method, the DC bus voltage ripple coefficient is reduced, harmonic waves generated by MPPT, phase-locked loop disturbance and switch modulation are suppressed, the total harmonic distortion rate of the output current of the inverter can be reduced, and the stability margin of the system under the weak power grid condition is improved.

The invention discloses a magnetic field modulation electro-magnetic excitation motor current harmonic suppression method based on voltage compensation. The method comprises the steps of obtaining self-inductance off-line data of an excitation winding according to an actual measurement or simulation result; calculating an average value, a harmonic order and an amplitude characteristic quantity based on excitation winding self-inductance off-line data; calculating an actively injected compensation voltage value in combination with the characteristic quantity and position and current information fed back in real time; superposing the compensation voltage value with the output voltage of the original PI controller to obtain a new reference voltage; a bipolar modulation method is adopted, a modulation wave and a carrier wave which are obtained through reference voltage are compared, a driving signal of an H-bridge switching tube is obtained, and therefore an exciting winding is driven to generate current after harmonic suppression. The invention provides a general harmonic suppression method suitable for a magnetic field modulation brushless electro-magnetic motor, and the method is easy to realize, can effectively suppress the current harmonic of an excitation winding, and guarantees the operation efficiency and stability of the motor.

The invention relates to the technical field of power distribution cabinet internal harmonic control, in particular to a power distribution cabinet harmonic suppression method based on multi-source data fusion. By extracting amplitude and phase information at each harmonic frequency point, branch equivalent admittance is calculated, and an admittance distribution state is formed; judging an abnormal branch with admittance deviation at each frequency point, and establishing a corresponding relation between the adjustable electrical parameters and the admittance deviation; in the operation process of the power distribution cabinet, the admittance distribution state and the abnormal branch set are periodically updated, the equivalent admittance of the target branch is dynamically adjusted according to the corresponding relation, and the distribution of the harmonic current among the branches is changed; through the method, the harmonic peak value and the multi-node superposition effect in the power distribution cabinet can be actively reduced, online operation under the condition of multi-frequency and multi-node load fluctuation is adapted, harmonic flow direction reconstruction is achieved on the premise that complex filtering or hardware devices are not added, and the electric energy quality and the system stability of the power distribution cabinet are improved.

The invention discloses an urban community household charging pile harmonic suppression method, which comprises the following steps: S1, collecting voltage and current data of a charging pile under different working conditions, analyzing harmonic generation characteristics, constructing a harmonic mathematical model, and determining typical harmonic frequency and amplitude range; s2, an FPGA real-time data processing architecture is designed according to the harmonic model, a high-speed data acquisition module is established, and real-time acquisition and accurate identification of harmonic signals are realized; s3, on the FPGA platform, based on the real-time harmonic spectrum data, deploying an adaptive harmonic suppression algorithm, dynamically filtering the target harmonic frequency, and reducing the harmonic content; and S4, according to suppression effect feedback, FPGA control parameters are optimized, energy consumption and cost of the device are reduced, and precise and efficient harmonic suppression performance and economical efficiency balance is achieved. The method can ensure that the current waveform of the charging pile meets the power grid standard, remarkably improves the harmonic suppression efficiency and the economical efficiency of the device, and reduces the energy consumption and the equipment maintenance cost.

The present application relates to a kind of double anti-star transformer rectification harmonic suppression control method.By establishing the rectification bridge arm phase characteristic parameter table in control platform, the theoretical conduction phase of bridge arm, winding attribution and waveform synchronization characteristic are recorded;In the operation process of rectification control unit, the output current of transformer and bridge arm conduction state are collected, and rectification operation state data set is generated;The conduction phase offset of bridge arm is calculated, the corresponding harmonic component is analyzed, and the mapping relationship between bridge arm state and harmonic distribution is obtained.According to the mapping result, it is judged whether the current bridge arm configuration meets the phase coverage requirement of target rectification pulse number, if not, select the standby bridge arm group with preset phase difference and generate switching instruction.Rectification control unit responds to instruction to lock current bridge arm conduction path and release target bridge arm group, realize bridge arm resource dynamic reconstruction and rectification performance optimization.The present application can effectively suppress harmonic, improve the topology adaptability and output quality of rectification system.

The invention relates to the technical field of flywheel energy storage, and discloses a harmonic conducted interference suppression method based on flywheel energy storage. The method comprises the following steps: collecting current and voltage signals of a direct current bus side of the flywheel energy storage system in real time, separating fundamental and harmonic components through frequency domain decomposition, and then calculating current and voltage harmonic characteristic parameters; and after comparison with a preset harmonic threshold value, a harmonic suppression reference point is dynamically set, and a progressive suppression signal of which the suppression intensity change rate is adjusted by a slope control module is injected into the reference point. Generating a rotating speed compensation coefficient by combining the coupling relationship between the harmonic characteristic parameter and the flywheel rotor rotating speed, and adjusting the suppression signal slope in real time; the adjusted signal is diffused to the overall system through a chain type conduction mechanism, meanwhile, the harmonic suppression feedback quantity is monitored to update the threshold condition, datum point setting and signal adjustment are repeated until the harmonic characteristic parameters meet the convergence criterion, and stable operation of the system can be guaranteed.

The invention discloses a reluctance sine type rotary transformer harmonic suppression method based on cogging optimization, which comprises the following steps: a reluctance sine type rotary transformer harmonic suppression initial model is built, a rotor of the initial model has two pairs of poles, a stator winding is divided into an inner layer and an outer layer, the outer layer is an excitation winding, and the inner layer is an output winding; optimizing a tooth groove of the reluctance sine type rotary transformer, changing flat top teeth into concentric arc teeth, optimizing contour parameters of a rotor and the width of a stator tooth yoke frame, and confirming the optimal range of parameter optimization; and an optimization result and finite element analysis verification are carried out, harmonic suppression is carried out through the cogging optimization design of the rotary transformer, and the performance of the reluctance sine type rotary transformer optimization model and the performance of the preliminary model are compared. By designing the concentric circle tooth crests and combining optimization of the rotor profile and the width of the stator tooth yoke frame, the sinusoidal property of an output signal is remarkably improved, harmonic distortion is reduced, and the output amplitude is improved.

The application relates to the technical field of power conversion device control, and discloses a power distribution network power conversion equipment harmonic suppression method and system. The method comprises the following steps: collecting harmonic amplitudes to construct a state vector and a coupling matrix, predicting the control harmonic and calculating a feedback influence quantity, superimposing an inhibition quantity and a compensation quantity to generate a double-layer instruction to adjust a switching parameter, outputting a pulse width modulation signal and monitoring a residual error to update the coupling matrix. The application improves the global optimization performance of harmonic suppression and the self-adaptive ability to power grid environment changes.

The application discloses a five-phase permanent magnet synchronous motor harmonic suppression control method based on machine learning, which comprises the following steps: S1, constructing a mathematical model of a five-phase permanent magnet synchronous motor driving system in a rotating coordinate system, and designing a five-phase permanent magnet synchronous motor control system based on a deep neural network; S2, deeply integrating motor physical prior information into a training process to enhance the generalization ability of the model, and proposing a hybrid optimization strategy to improve the fitting precision of a predicted network voltage and an actual working voltage, suppress fluctuations in the prediction process, and make the predicted value more suitable for actual operation requirements. The application overcomes the limitations of the existing double-plane current control method, and fully utilizes the technical advantages.

The invention provides a harmonic suppression method, device, equipment and product based on broadband impedance measurement, and the method comprises the steps: carrying out the measurement and analysis of all elements in a hybrid multi-infeed DC system according to a preset broadband impedance measurement method, and obtaining broadband impedance data, the preset broadband impedance measurement method is composed of an active disturbance method and a wavelet time-frequency analysis method; according to the topological structure of the hybrid multi-infeed direct current system, determining an LCC converter and an MMC converter in the hybrid multi-infeed direct current system; according to an LCC converter and an MMC converter in the hybrid multi-infeed direct current system, carrying out classification processing on the broadband impedance data, and constructing a harmonic interaction impedance analysis model; according to a characteristic value analysis method, the harmonic interaction impedance analysis model is analyzed, harmonic analysis of the hybrid multi-infeed direct current system is completed, the real-time performance and robustness of harmonic suppression are improved, and a theoretical basis is provided for harmonic suppression and stability optimization of the hybrid multi-infeed direct current system.

The invention discloses a permanent magnet synchronous motor harmonic current suppression method, device and equipment and a storage medium, and the method comprises the steps: S1, current decomposition and estimation: carrying out the adaptive current estimation of a phase current of a permanent magnet synchronous motor based on a robust adaptive estimator, and obtaining a fundamental current component and a harmonic current component of the phase current; and S2, harmonic current suppression: performing feedback proportional gain calculation on the estimated harmonic current component through a proportional controller to obtain a harmonic suppression voltage, and inputting the harmonic suppression voltage into a motor controller to realize harmonic current suppression of the permanent magnet synchronous motor. Aiming at the defects of the existing permanent magnet synchronous motor harmonic current suppression method, the invention provides a simple, visual and easy-to-implement motor harmonic current suppression method, which can effectively suppress higher harmonics in the phase current of the permanent magnet synchronous motor, reduce the torque and rotation speed pulsation of the motor and improve the operation efficiency and reliability of the motor.

The application belongs to the technical field of electric machines, and discloses a magnetic suspension fan variable frequency driving device and a harmonic suppression method; the method comprises the following steps: judging a transient operation process and activating a phase compensation mechanism by monitoring the state of the electric machine in real time, extracting harmonic components in real time and updating a weight vector to obtain harmonic currents of different orders; meanwhile, a phase compensation amount is dynamically obtained based on a pre-built control loop phase lag atlas, an anti-phase harmonic voltage is calculated in combination with the harmonic currents and the compensation phase, and the variable frequency device is injected through a space vector pulse width modulation method to realize accurate harmonic cancellation; torque safety monitoring is also independently operated in parallel in the whole process, the electromagnetic torque and its change rate are detected in real time to perform safety logic determination, and a protection action is triggered when the limit is exceeded; the application can realize accurate cancellation of anti-phase harmonics and actual interference harmonics in the transient process, significantly reduce the instantaneous impact of the electromagnetic torque, and effectively improve the operation stability and reliability of the magnetic suspension fan variable frequency driving system under transient working conditions.

The embodiment of the invention belongs to the motor control technology, and provides a harmonic suppression method, device and system, and the method comprises the steps: obtaining a d-axis component and a q-axis component of a three-phase current outputted to a permanent magnet synchronous motor by an inverter circuit in a dq coordinate system in real time; according to the d-axis component and the q-axis component of the three-phase current, harmonic suppression processing is executed, and a d-axis component and a q-axis component of the compensation current are obtained; wherein the harmonic suppression processing comprises the following steps: respectively carrying out high-pass filtering processing on a d-axis component and a q-axis component of the three-phase current to obtain a d-axis component and a q-axis component of the harmonic current; respectively inputting the d-axis component and the q-axis component of the harmonic current into a controller to obtain the d-axis component and the q-axis component of the compensation current; and according to the d-axis component and the q-axis component of the compensation current, the three-phase current output to the permanent magnet synchronous motor by the inverter circuit is adjusted. The harmonic current can be effectively suppressed, and the motor control performance is optimized.

The application provides a silicon carbide device-based permanent magnet synchronous motor active disturbance rejection current harmonic suppression method, relates to the technical field of motor control, is implemented in a motor controller / electric drive system, adopts an improved cascade extended state observer structure, performs hierarchical observation and feedforward compensation on total disturbance of a q-axis current loop, a first-stage extended state observer estimates a q-axis current and basic disturbance in real time, a second-stage extended state observer introduces a second-order resonator to model residual error signals and extract harmonic disturbance of a specific angular frequency, and the outputs of the two-stage observer are superposed to form a total disturbance estimation value, which is feedforward compensated through an active disturbance rejection control law. Without adding extra hardware sensors, the method effectively suppresses main harmonics of a motor current loop, significantly improves the harmonic suppression performance and operation stability of the permanent magnet synchronous motor current loop, has the characteristics of simple structure and convenient implementation, and is suitable for scenes such as a silicon carbide device-based motor controller or electric drive system.

The invention provides a harmonic suppression method, device and equipment for a Hull moving average filter and a medium. The harmonic suppression method comprises the steps of collecting load end current; based on an improved harmonic current detection method, a harmonic current instruction signal is detected and extracted according to a load end current; controlling the harmonic current command signal to pass through an active power filter to generate a compensation current; and the compensation current is injected into the power grid. The technical problems that in a traditional harmonic and reactive current detection method, unavoidable losses are brought to the dynamic response speed and accuracy of current detection, and the harmonic compensation performance of a system is finally affected are solved.