1313 results about "Reference current" patented technology

The invention discloses an impedance characteristic remodeling method, device and equipment and a medium, and is applied to the field of wind turbine generators. Wherein the corresponding rotor reference current is determined according to the electromagnetic reactive power, the active power and the corresponding power reference value; correcting the rotor current according to the rotor reference current by adopting a virtual admittance control mode, and generating a corresponding rotor voltage given value; sequentially performing differentiation, filtering and signal extraction processing on the rotor reference current and the rotor current to obtain an impedance remodeling signal; and correcting the rotor voltage given value based on the impedance remodeling signal so as to enable the corrected rotor voltage given value to serve as the control voltage of a rotor side converter in the medium-voltage doubly-fed wind turbine generator after impedance characteristic remodeling. The virtual admittance control mode and the impedance remolding signal mode are adopted to suppress the negative resistance effect of the rotor side converter in the medium-voltage doubly-fed wind turbine generator under voltage disturbance, and therefore the damping effect on external excitation in the sub-super-synchronous frequency band and the high frequency band is higher.

The invention discloses a hybrid effective flux linkage observer and a permanent magnet synchronous motor control method, device and system. The method comprises the following steps: carrying out Clarke conversion on an obtained three-phase current of the permanent magnet synchronous motor to obtain a current in a static coordinate system, and carrying out park conversion based on rotor position information to obtain a current in a synchronous rotating coordinate system; the effective flux linkage of the permanent magnet synchronous motor is obtained through the hybrid effective flux linkage observer; on the basis of the obtained effective flux linkage of the permanent magnet synchronous motor, dead-zone compensation voltage is obtained through self-adaptive gain dead-zone compensation calculation based on back electromotive force reconstruction, and the rotating speed and the rotor position of the permanent magnet synchronous motor are obtained through phase-locked loop calculation; according to the rotating speed and the rotor position of the permanent magnet synchronous motor, the current under the synchronous rotating coordinate system, the dead zone compensation voltage and the obtained reference rotating speed and reference current, the reference voltage of the motor at the k moment is obtained through a rotating speed loop and a current loop and used for achieving low-speed position-sensorless control over the permanent magnet synchronous motor.

The invention relates to a multi-frequency bioelectrical impedance-based body fat accurate measurement method and system. The method comprises the following steps: receiving a mode selection instruction sent by a user to determine a current working mode; if the mode is a rapid measurement mode, applying single reference frequency and reference current intensity excitation, obtaining a single group of bioelectrical impedance data, and calculating a rapid body fat rate result; if the measurement mode is an accurate measurement mode, acquiring bioelectrical impedance data under a plurality of preset frequencies and a plurality of preset current intensities through a complete electrode system, performing signal processing on the data, extracting impedance amplitude and phase information, constructing an impedance characteristic curve, extracting characteristic parameters related to the body fat rate from the impedance characteristic curve, and calculating the body fat rate based on the characteristic parameters. And obtaining a final body fat rate result of the accurate measurement mode. According to the method, the body fat rate can be accurately measured, and the accuracy and reliability of a measurement result are improved.

The invention relates to a lightning arrester leakage ammeter self-calibration method and system, and the method comprises the following steps: disconnecting a main leakage ammeter from an external main measurement loop, and closing a calibration loop of a redundancy calibration sensor and a reference current source after a preset time is delayed; controlling a reference current source to output standard signals with different current magnitudes, collecting the standard signals by using a redundancy calibration sensor, extracting effective signal components, and performing environment compensation; iteratively calculating a relative error between the effective signal component and the standard signal, if the relative error is less than or equal to a second threshold value, updating a calibration coefficient according to a ratio of the standard signal to the effective signal component, and correcting a measurement result of the main leakage ammeter based on the calibration coefficient; if the relative error is greater than a third threshold value, locking output and uploading fault information; otherwise, recording as one exception, and carrying out maintenance early warning according to the number of exceptions. Compared with the prior art, the self-checking and real-time calibration of the leakage ammeter of the lightning arrester can be completed on the premise of not influencing the operation of power equipment.

The invention provides a dynamic impedance matching charger based on battery aging, a method, electronic equipment and a medium. The charger comprises a master control unit, and a battery state monitoring module, an aging grade evaluation module, a dynamic charging control module, a battery cell balancing module, an optimization control module and an anti-interference module which are connected with the master control unit to cooperatively realize charging closed-loop control. The battery state monitoring module injects a preset frequency alternating current signal and outputs an impedance parameter, a charge state and a temperature parameter; the aging grade evaluation module outputs a battery aging grade in combination with a preset model; the dynamic charging control module is matched with an adaptive charging mode instruction; the battery cell balancing module calculates the battery cell impedance difference, and balancing operation is executed if the battery cell impedance difference reaches the standard; the optimization control module generates an optimized current instruction through a preset algorithm according to the related parameters, and superposes the optimized current instruction to the reference current; the anti-interference module improves the signal-to-noise ratio of collected signals to a preset standard through isolation and shielding design.

The invention discloses a current distribution regulation and control voltage balance SOC optimization method, and the method comprises the specific steps: determining the type of a balance strategy according to the SOC difference between battery modules; according to the determined equalization strategy, the total cluster current of the system is distributed to each module according to SOC, and module reference current is generated and calculated; and finally, converting the module reference current into a bus voltage reference instruction, and controlling each module to track a voltage target to realize current distribution. According to the current distribution regulation and control voltage balance SOC optimization method provided by the invention, the target current is calculated, and then the current reference is converted into the bus voltage reference, so that the dynamic response speed and stability of the DC bus voltage are improved.

The invention relates to the technical field of digital playing equipment, and provides a lossless control method for the volume of a digital player and the digital player. The method comprises the following steps of: after receiving a target volume parameter, executing dynamic multiplying power oversampling and high-order noise shaping on an input digital audio signal, and injecting preset jitter to suppress in-band quantization distortion so as to generate an optimized digital audio stream; meanwhile, a high-resolution digital reference current control instruction corresponding to the target volume is independently generated, output of a reference current source is adjusted according to the high-resolution digital reference current control instruction, and a high-precision differential current signal is obtained by combining nonlinearity, temperature excursion and quantization errors of a closed-loop feedback compensation device through a multi-bit current segmentation network; performing bias stabilization processing on the signal, and converting the signal into a differential voltage signal for suppressing common-mode noise through a precision differential resistance network; and finally, low-distortion differential analog audio signals capable of directly driving a load are output through low-distortion gain, impedance conversion and power driving, so that low-distortion, high-signal-to-noise-ratio and wide-dynamic-range output in a full-volume range is realized.

The invention provides a current detection circuit, a chip and a control system, and relates to the technical field of power management chips, the circuit comprises a reference current generation circuit, a differential signal conversion circuit and a voltage conversion circuit; the reference current generating circuit is used for generating reference current; the differential signal conversion circuit is used for performing differential operation on the accessed first input voltage and second input voltage to obtain differential voltage and converting the differential voltage into differential current; the current acquisition module is also used for acquiring a first current based on the reference current, and the first current is the difference between the reference current and the differential current; and the voltage conversion circuit is used for converting the first current into a voltage signal to obtain an output voltage. By converting the differential voltage into the differential current, the limitation of the current detection circuit on the condition that the input signal is relatively high common-mode voltage can be overcome, and the problem that the output offset voltage is relatively high when the common-mode voltage of the input signal is relatively high is reduced, so that the output offset voltage is reduced.

The invention discloses an on-line monitoring and compensating method and system for the thickness of an electroplated layer of an automobile part based on current self-adaptive adjustment, and relates to the technical field of automation and intelligent control. Correcting the original thickness data according to the deviation degree between the current temperature and the real-time PH value and the preset reference data to obtain the real coating thickness of each subarea under the reference condition, judging that the real coating thickness reaches the standard according to the preset trigger compensation condition, if the real coating thickness reaches the standard, continuously monitoring on line, and if the real coating thickness does not reach the standard, determining the current increment of each subarea. According to the method, the current increment is compensated according to the influence of the PH value deviation, the reference current is adjusted, the final adjustment current is output, and the plating thickness of each subarea is dynamically compensated, so that the multi-dimensional process variable can be sensed, and the plating thickness of each subarea can be dynamically compensated by dynamically adjusting the current and compensating the thickness deviation caused by parameter fluctuation. And finally, the whole-course accurate control of the coating thickness of the automobile part is realized.

The invention relates to the field of three-level inverters, and particularly discloses a model-free strong-robustness predictive control method and system for a three-level SNPC inverter, and the method comprises the steps: carrying out the real-time sampling and coordinate transformation of the inverter, and obtaining the current and voltage components under a two-phase static coordinate system; establishing a hyper-local model, enabling the system parameter deviation and the external disturbance to be uniformly equivalent to lumped disturbance, and designing a full-order sliding-mode observer for real-time estimation; calculating a reference voltage vector based on the disturbance estimation value and the extrapolated reference current; and an optimal double-vector combination is selected through space vector optimization, action time is solved, redundant small vectors are selected according to midpoint voltage deviation, and PWM driving signals are generated. According to the method, excellent current tracking performance and low harmonic distortion can still be kept under the conditions of parameter mismatch and working condition change, meanwhile, neutral-point potential balance on the direct-current side is achieved, and the method has the advantages of being small in calculation amount, high in robustness, easy to achieve in engineering and the like.

The invention belongs to the technical field of grid-connected inverter harmonic analysis, and particularly discloses a grid-connected inverter harmonic closed-loop transmission analysis method and system considering broadband coupling. The method comprises the following steps: respectively establishing a harmonic component transfer function of each module; based on the harmonic component transfer function of the sampling module, calculating to obtain harmonic active power and harmonic reactive power input to the power outer loop control module; based on a harmonic component transfer function of the power outer loop control module, calculating to obtain a harmonic current component in a reference current signal output by a power outer loop; based on a harmonic component transfer function of a current inner loop control module, obtaining a three-phase modulation voltage harmonic component and an inverter port voltage harmonic component through coordinate inverse transformation; on the basis of the inverter port voltage harmonic component, a main circuit harmonic transfer equation is combined, and a grid-connected point harmonic current component is obtained through calculation; the method overcomes the defects that a traditional analysis method cannot consider the control of a whole loop by a closed loop, and the broadband coupling is insufficiently considered.

The invention relates to a ripple suppression PI loop control method, a storage medium and a device, and the method comprises the steps: extracting a frequency doubling component in an inversion power flow based on the filtering and Park transformation of a secondary second-order generalized integrator, determining the reverse compensation amount at each moment based on the frequency doubling component and a battery connected with a DC circuit, and carrying out the control of the ripple suppression PI loop. And finally, based on the sum of the reverse compensation amount at each moment and an original reference current value output by a voltage outer ring on each bridge arm of the DC circuit, determining a current reference instantaneous value after reverse compensation of a current inner ring input to each bridge arm at each moment. According to the method, a pure frequency doubling component with very high dynamic performance and related to ripple information is obtained, then according to the extracted frequency doubling component and battery parameters, the reverse compensation amount used for suppressing ripple in loop control is obtained, and then the reverse compensation amount is accumulated to a voltage outer loop, so that the ripple information is suppressed. Therefore, ripple suppression with good dynamic performance and good suppression effect in loop control is realized.

The invention discloses a negative voltage clamping circuit and method. The negative voltage clamping circuit comprises a current mirroring module which is used for providing a reference current Iref and generating a corresponding reference current according to a preset current proportion mirroring; the voltage detection module is connected with the current mirror module and the negative voltage input end of the chip and is used for detecting the voltage VS of the negative voltage input end; and the clamping control module is connected with the current mirroring module and the voltage detection module, and the clamping control module is configured to be switched on when the voltage VS of the negative voltage input end exceeds a preset clamping threshold value and clamp the voltage VS of the negative voltage input end within a preset range. According to the negative voltage clamping circuit, the change of the negative voltage input end can be monitored in real time, it is ensured that the clamping control module responds rapidly when the voltage exceeds a threshold value, the negative voltage is limited within a safe range, circuit damage or performance reduction caused by too low voltage is avoided, and therefore the stability and reliability of a chip are improved.

The invention discloses a fault detector of an accelerator switch assembly and a detection method thereof. The fault detector comprises at least one detection circuit. Each detection circuit comprises three constant current sources with equal output current, a first resistor and two voltage comparators; the input ends of the three constant current sources are used for inputting reference current; the output end of the first constant current source and the output end of the second constant current source are used for being connected with a normally-closed contact and a normally-open contact of an electric switch to be tested respectively, and the output end of the third constant current source is grounded through a first resistor. The common contact of the to-be-tested switch is grounded. Two input ends of the first voltage comparator are respectively connected with the output end of the first constant current source and the output end of the third constant current source; two input ends of the second voltage comparator are respectively connected with the output end of the second constant current source and the output end of the third constant current source; the output ends of the first voltage comparator and the second voltage comparator are used for outputting detection signals. According to the scheme, the detection efficiency and the detection precision of fault detection of the accelerator switch assembly can be greatly improved.

The invention provides an output negative voltage protection circuit applied to an N-type power device linear voltage regulator. The output negative voltage protection circuit comprises a voltage comparator, a current comparator, an error amplifier, a buffer driver, a power device MP, a resistor R1, a resistor R2, a resistor Rload and a capacitor Cout. The method comprises the following steps: acquiring a voltage difference between an S-pole output voltage Vout of a power device MP and a reference voltage Vos through a voltage comparator, converting the voltage difference into a current signal Ieg, and comparing the current signal Ieg with a reference current Ios through a current comparator to generate a current signal Ilim; adjusting the output of an error amplifier according to the current signal Ilim, and dynamically adjusting the G pole voltage Vgate of the power device MP; when the output voltage Vout is lower than the reference voltage Vos, the G pole voltage Vgate is pulled down to turn off the power device MP through the current signal Ilim, and protection of the power device MP is achieved.

The invention relates to a tunnel reluctance current sensor structure and temperature parameter optimization method and system, and the method comprises the steps: arranging an annular magnetic core, forming symmetrically distributed air gaps in the annular magnetic core, placing a tunnel reluctance current sensor in each air gap, and forming a double-air-gap magnetic circuit structure; constructing a magnetic field consistency coefficient according to the average magnetic induction intensity, the minimum magnetic induction intensity and the maximum magnetic induction intensity of the air gap center area, and performing optimization solution on structural parameters of the double-air-gap magnetic circuit structure by taking minimization of the magnetic field consistency coefficient as a target; respectively establishing a measurement channel and a reference channel according to the double-air-gap magnetic circuit structure obtained through optimization solution; multiple times of voltage signal acquisition are carried out through a reference channel under different injection reference currents and different temperature environments, and a temperature compensation factor is calculated, so that gain parameters of an amplifier in a measurement channel are adjusted. Compared with the prior art, the anti-interference capability and the measurement sensitivity of the system can be greatly improved.

The invention relates to the technical field of current detection, and provides a half-bridge driven bidirectional current detection circuit and a three-phase motor driving circuit. The bidirectional current detection circuit comprises a reference current generation circuit, an isolation unit and a sampling circuit. The reference current generating circuit works in a low-voltage domain and is used for generating a reference current signal. The isolation unit transmits the reference current signal to a high-voltage domain. The sampling circuit works in a high-voltage domain, receives a reference current signal, and is coupled to a common node between a high-side power tube and a low-side power tube in the half-bridge driving circuit to sample current flowing between the common node and a load so as to generate a current sampling signal. According to the current detection scheme, bidirectional detection of the load current can be realized, the circuit is simple, and the detection precision is high.

The invention relates to the technical field of numerical control machine tool control, in particular to a numerical control machine tool axial positioning control method and system. The method comprises the following steps: driving a servo motor to execute reverse clearance compensation motion; the synchronous sampling period obtains a position signal and a load current signal; performing composite judgment based on the position signal and the load current signal: judging whether the variable quantity of the position signal along the instruction direction reaches a preset position threshold value or not, and judging whether the increment of the load current signal relative to the reference current value reaches a preset current threshold value or not; when all items are compositely judged to be met at the same time, it is judged that the mechanical clearance is eliminated, reverse clearance compensation motion is terminated, and a double-closed-loop axial positioning control mode is switched; and when any one item is not satisfied through composite judgment, keeping the reverse clearance compensation motion. The problems that when the numerical control lathe rotates reversely in the axial movement direction for clearance compensation, compensation is not accurate, a workbench continuously wriggles near the target position, and the machining precision is affected are solved.

The invention discloses a control method and device for a quasi-Z-source network inverter circuit, an inverter and a medium. The control method comprises the following steps: firstly, acquiring a direct-current chain voltage of a quasi-Z-source network, an instantaneous output power of an IPM module and an input voltage of an alternating-current power supply access module; determining an initial reference current according to the instantaneous output power and the input voltage; then, according to the direct-current chain voltage and a preset voltage threshold value, current correction is determined; then, sampling the input voltage to obtain voltage phase information, and correcting the initial reference current according to the voltage phase information and the current correction amount to obtain target reference current; according to the embodiment of the invention, a target reference current is generated, a PWM modulation signal is generated according to the target reference current, and an IPM module is driven according to the PWM modulation signal, so that the inductive current of a first inductor reaches the target reference current, and therefore, the power factor of the Z-source network inverter circuit can be effectively improved under the condition that an alternating current power supply is used as input.

The invention provides a virtual inertia adaptive control method, device and system, and relates to the technical field of inverter system control. The method comprises the following steps: calculating a reference current value according to a power reference value and an actual output voltage; calculating a current deviation value according to the reference current value and the actual output current value; outputting the current deviation value to an adaptive resonance controller to obtain a compensation control voltage signal; inputting the compensation control signal to an AHO virtual oscillator to obtain a reference value of the output voltage of the inverter; and controlling the output of the three-phase inverter circuit according to the reference value of the inverter output voltage. Wherein the adaptive resonance controller carries out adaptive control through the proportional parameter and the proportional resonance inertial parameter. The virtual inertia output can be dynamically adjusted according to the real-time requirement of the system, the overshoot phenomenon caused by power oscillation is effectively suppressed while the frequency stability is met, and the capacity of the system for resisting sudden load change and frequency disturbance is enhanced.

The invention discloses an energy storage converter control method and system based on network construction-network following coupling. The method comprises the following steps: extracting and processing an output current of an energy storage converter, and comparing the output current with a reference current to obtain a comparison signal; inputting the comparison signal into a network construction type control branch to obtain a first reference voltage; inputting the comparison signal into a network-following type control branch to obtain a second reference voltage; inputting the first reference voltage and the second reference voltage into a network construction-network following coupling model to obtain a coupling voltage; and controlling the energy storage converter based on the coupling voltage. The system corresponds to the method. According to the energy storage converter, through coupling of the network construction type control branch and the network following type control branch, the supporting capacity of network construction control on the voltage and frequency of the power grid is achieved, rapid current response can be achieved by means of network following control, and the dynamic performance and the power grid adaptability of the energy storage converter are effectively improved.

A seamless switching method and device for network-oriented MMC-HVDC converter station construction and network following control, relates to the field of power system control technology, without changing the inner loop current control, by constructing a unified outer loop reference current and initializing the setting of phase angle and voltage amplitude, the continuity of output voltage power angle and amplitude in the control mode switching process is ensured. The technology can quickly respond to changes in grid conditions, avoiding system disturbance and instability caused by mode switching. Simulation results show that this technology effectively reduces the impact of control switching on the system, significantly improves the stability and reliability of the system, and is suitable for flexible HVDC transmission systems under various grid conditions, especially in weak grid access and frequency support scenarios.

The invention discloses a method for testing the peak current of a power battery. The method comprises the following steps: S1, determining the actual capacity of a to-be-tested battery; s2, determining test conditions of the to-be-tested battery; s3, testing peak current; under the test condition, based on a plurality of preset reference current values, carrying out peak current test with the maximum value of the target pulse duration to obtain a plurality of actually measured pulse currents, sampling and recording a pulse whole-process voltage value, and intercepting to obtain an actually measured cut-off voltage corresponding to each pulse duration node; s4, calculating theoretical peak current; outputting measured data obtained by performing peak current testing on the same pulse time length node under different reference current values as a group of theoretical data, and calculating theoretical peak current under each pulse time length node based on the theoretical data of each pulse time length node; the actually measured data comprises actually measured cut-off voltage and actually measured pulse current; and S5, performing pulse actual measurement verification on the theoretical peak current.

A battery management system includes a sensing unit to generate a sensing signal indicating a battery voltage and a battery current of a battery, a memory unit to store a charge map recording a correlation between first to nth reference state of charge (SOC) ranges, first to nth reference currents and first to nth reference voltages for multi-stage constant-current charging, and a control unit to change to constant voltage charging using a kth reference voltage corresponding to a kth reference SOC range in response to the battery voltage having reached the kth reference voltage during constant current charging using a kth reference current corresponding to the kth reference SOC range to which an SOC of the battery belongs. The control unit updates the kth reference current of the charge map based on a time-series of the battery current in a charging period of the constant voltage charging.

The invention discloses a method and a system for regulating and controlling imbalance of a power distribution area, which are used for solving the technical problem of poor operation stability of the power distribution area caused by a traditional method for regulating and controlling imbalance of the power distribution area. The method comprises the following steps: acquiring three-phase bus voltage and three-phase current of a power distribution area; generating a power distribution area three-phase component voltage and a power distribution area power optimization objective function according to the power distribution area three-phase bus voltage and the power distribution area three-phase current; solving the power optimization objective function of the power distribution area, and outputting predicted power of the power distribution area; calculating a three-phase reference current of the power distribution area based on the predicted power of the power distribution area and the three-phase component voltage of the power distribution area; and according to the three-phase reference current of the power distribution area, generating a power distribution area imbalance regulation and control signal.

The invention discloses a PMSLM adaptive optimization harmonic current suppression method based on a multi-rotating coordinate system. According to the method, high-precision extraction of target harmonic waves is realized through a multi-rotating reference coordinate system and a complex coefficient filter; an adaptive moment estimation algorithm (AdamW) with weight attenuation is used to quickly solve an optimal harmonic reference current; and harmonic compensation voltage is output by combining the zero static error characteristic of the proportional resonance PR controller, so that the harmonic current is effectively suppressed. The harmonic current of the permanent magnet synchronous linear motor is quickly and effectively suppressed through a harmonic injection method adopting a multi-rotation reference coordinate system, a complex coefficient filter and an AdamW optimization algorithm. The inherent defects of large phase lag and slow dynamic response when a low-pass filter is used in a traditional harmonic current injection method can be effectively overcome by adopting a complex coefficient filter for current extraction; and an AdamW optimization algorithm is adopted to suppress overfitting through a weight attenuation strategy, and an optimal solution is efficiently and stably obtained.

The invention relates to a DC networking new energy ship shore power grid-connected anti-disturbance control method and system, and the method comprises the steps: calculating an angular frequency and a phase angle based on a virtual synchronous generator model, inputting the angular frequency deviation into an extended state observer, and estimating the total disturbance in real time; performing feedforward compensation fusion on the original active instruction of the virtual synchronous generator and the total disturbance observation value to generate an anti-disturbance active power reference instruction; running SPWM modulation according to the direct current side signal and the active instruction, and generating a modulation signal to control power conversion; the driving signal is fed to a power grid after being amplified and filtered; meanwhile, output current is collected and compared with reference current synthesized by phase angles, zero static error tracking is achieved through a quasi-proportional resonance controller, and compensation signals are generated for real-time correction modulation; the grid-connected power converter adopts a new-generation power electronic switching device SiC-MOSFET, and the efficiency can exceed 98%. Compared with the prior art, the system has the advantages of high stability, high electric energy quality, high reliability and the like.

A wireless charging receive end, system, and control method related to the field of wireless charging technologies are provided. The wireless charging receive end includes a receiver coil, a compensation network, a power converter, and a receive end controller. The receiver coil converts an alternating magnetic field transmitted by a transmit end into an alternating current and transmits the alternating current to the compensation network. The compensation network compensates for the alternating current and then transmit a compensated alternating current to the power converter. The power converter rectifies the compensated alternating current into a direct current for charging a load. The receive end controller obtains a reference signal based on an input current of the power converter and an input reference current, and sends the reference signal to a transmit end controller.

The invention discloses an excitation carbon brush and collecting ring digital monitoring operation and maintenance system, method and device and a medium, and belongs to the technical field of power equipment monitoring, and the method comprises the steps: obtaining the real-time current data of a plurality of carbon brushes, and determining the deviation degree of each carbon brush current relative to a reference current; according to the generator operation condition parameters, determining a deviation threshold value used for judging carbon brush current abnormity; when it is detected that the current deviation degree of the target carbon brush exceeds a deviation threshold value, an adjustment control signal is generated; and responding to the adjustment control signal, performing mechanical stimulation operation on the target carbon brush, and changing the contact state of the target carbon brush and the collector ring. Automatic balance adjustment of the current of the carbon brush is realized through mechanical stimulation operation, and the service life of the carbon brush is prolonged.

The application discloses a multi-phase motor communication-free redundancy control system and a control method, which comprises a rotating speed controller, a reference current selection module, a plurality of inner loop current controllers and a plurality of modulation and driving modules. The rotating speed controller receives a given reference rotating speed of a motor and an actual rotating speed of each set of windings, and outputs a q-axis reference current in a dq rotating coordinate system. The reference current selection module receives the q-axis reference current, specifies a master winding and a slave winding in the plurality of windings, and outputs a d-axis and q-axis reference current of each redundancy. The inner loop current controller is connected with the reference current selection module, receives the d-axis and q-axis reference current of the corresponding winding and a feedback current thereof, and outputs corresponding d-axis and q-axis reference voltage. The plurality of modulation and driving modules drive and control each winding. The application realizes communication-free control through master-slave following of the windings, can avoid the problem of collaborative failure caused by communication failure, and thus improves the steady-state performance of the motor.