121 results about "Three phase inverter" patented technology

The invention relates to the technical field of new energy grid connection, in particular to a new energy grid-connected inverter system based on a double-stator synchronous motor interface, which comprises a three-phase inverter and a double-stator synchronous motor, the double-stator synchronous motor comprises a first stator, a rotor and a second stator. Planar air gaps exist between the rotor and the first stator and between the rotor and the second stator. The rotor comprises a first rotor and a second rotor which are rigidly connected, the first rotor is axially adjacent to the first stator, the second rotor is axially adjacent to the second stator, and a magnetic isolation ring is arranged between the first rotor and the second rotor; each of the first stator and the second stator comprises a stator core and an armature winding, the first rotor comprises a first rotor core, an excitation winding and a starting winding, and the second rotor comprises a second rotor core and a permanent magnet. According to the invention, the double-stator configuration can realize voltage transformation and frequency conversion functions, and can solve the problems of reduced power grid inertia, insufficient short-circuit capacity, aggravated broadband oscillation risk and the like caused by grid connection of large-scale new energy through power electronic equipment.

A three-phase wireless electric energy transmission device disclosed by the present invention comprises a three-phase inverter, a three-phase switch capacitor, a coil magnetic field coupling structure and a rectifier, the coil magnetic field coupling structure comprises a primary coil and a secondary coil which are arranged in mirror symmetry, the primary coil is provided with two layers, each layer comprises a three-phase coil, each phase coil occupies a 120-degree angle range of the circumference, and the rectifier is connected with the primary coil and the secondary coil. The two layers of coils form a staggered angle, each phase of switched capacitor of the three-phase switched capacitor comprises a first capacitor branch and a second capacitor branch which are arranged in parallel, the first capacitor branch is provided with a first capacitor, and the second capacitor branch comprises a second capacitor and a switch module which are arranged in series; the switch module adjusts the equivalent capacitance value of the second capacitor branch through the duty ratio and adjusts the transmission power of the three-phase wireless power transmission device. The invention further discloses a load power adjusting method of the three-phase wireless power transmission device, the transmission efficiency can be kept unchanged within the adjusting range, and soft switching can be achieved within the adjusting range.

The invention discloses a split-phase anti-countercurrent control method and system for a three-phase inverter. The method comprises the following steps: acquiring output power, load power and grid-connected power of each phase of the three-phase inverter in real time; for each phase, calculating the difference between the load power and the output power, if the difference is less than or equal to 0, judging that the phase has countercurrent, and performing corresponding split-phase control; and if the difference is greater than 0, judging that the phase has a countercurrent trend, and carrying out corresponding split-phase control.

This invention discloses a dual-variable symmetrical injection modulation method for a two-phase permanent magnet synchronous motor, belonging to the field of motor drive and control technology. The method includes the following steps: S1, setting motor start-up logic and soft-start parameters; S2, generating two-phase orthogonal line voltage commands; S3, dual-variable symmetrical injection; S4, PWM comparator register mapping and output; S5, periodic execution. This method requires no modification to the hardware topology of a standard three-phase voltage source inverter or the addition of additional circuit components, and can be directly deployed on existing mature hardware platforms. This allows the same three-phase inverter to be used to drive both three-phase and two-phase motors, achieving hardware platform reuse and standardization, significantly reducing system development and bill of materials costs, resulting in low hardware cost and strong versatility.

This invention relates to a low-current harmonic direct torque control method for a dual three-phase permanent magnet synchronous motor (PMSM), belonging to the field of PMSM control technology. The method is as follows: S1: Establish mathematical models of the fundamental and harmonic subspaces of the dual three-phase PMSM under vector space decoupling, and clarify the voltage vector distribution characteristics of the two subspaces; S2: In the fundamental subspace, design a duty cycle modulation strategy based on the principle of minimizing the error vector, and an improved deadbeat flux linkage torque controller; S3: In the harmonic subspace, design an online learning harmonic canceller, using the least mean square algorithm to update the weight coefficients in real time; S4: Select the D1 vector set as the effective vector of the harmonic subspace and perform sector division; S5: Add the effective voltage vector action time of the fundamental and harmonic subspaces to generate the final switching sequence, which is output to the dual three-phase inverter to effectively suppress torque ripple and harmonic current of the dual three-phase PMSM.

The present application relates to a discontinuous pulse width modulation method and to a three-phase inverter modulation circuit, wherein the discontinuous pulse width modulation method, on one hand, reduces the number of switching actions relative to a traditional SVPWM method, thereby reducing power consumption and improving the working efficiency of the inverter, and on the other hand, greatly increases stability relative to a traditional DPWM method, is capable of stable operation even with a continuously changing modulation ratio, and incorporates two advantages in low power consumption and high stability, the width modulation method provided by the present application likewise does not need to switch between different modulation modes.

1. The name of the design product: three-phase inverter. 2. The use of the design product: for small business energy storage system, can realize inversion and rectification. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The invention discloses a sensorless field-oriented control motor driving method and device for a molecular pump, and relates to the technical field of molecular pumps, and the method comprises the steps: S1, starting a motor, and obtaining related data; s2, positioning a rotor; s3, rotor acceleration; s4, judging whether a stable condition is met or not, if so, entering S5, and otherwise, returning to S3; s5, obtaining related data; s6, whether the rotor speed reaches the standard or not is judged, if yes, S13 is executed, and if not, S7 is executed; s7, analyzing the current component and the current; s8, analyzing a back electromotive force component; s9, analyzing a rotor angle estimation value and an angular velocity estimation value; s10, outputting a voltage instruction; s11, generating and compensating a PWM driving signal; s12, driving the three-phase inverter, and returning to S5; s13, judging whether to stop or not, if so, stopping, and if not, stably operating; counter electromotive force estimation, rotor angle tracking, current control and starting and closed-loop switching processes are cooperatively designed, so that the problem of insufficient suitability of a traditional scheme in application of the molecular pump is solved, and the high-speed and high-torque requirements of the adaptive molecular pump are met.

This invention relates to a dual-motor on-board integrated single-phase AC zero-torque charging method for electric vehicles, specifically for the electric vehicle charging field. It solves the problem that existing dual-motor electric vehicles and their associated drive inverters, which reuse single-phase charging, cannot simultaneously improve the grid-side equivalent filter inductance and ensure zero torque during charging. This invention achieves stationary charging without generating rotational torque in either motor under single-phase AC power input by adding only a single-pole three-throw switch and selecting the corresponding winding reconfiguration method based on the rotor position of the first motor. This is combined with specific on / off control of the switching transistors of the two three-phase inverters (two phase half-bridges alternately conduct in one motor, while the other phase half-bridge is off; the other motor has the entire bridge fully open or fully closed depending on the power supply polarity). This invention is primarily applied to zero-torque charging of electric vehicles.

This invention discloses a method for detecting the health status of a new energy vehicle power supply, belonging to the field of power supply technology. The invention first extracts abnormal current signals from the phase line current signals of the three-phase inverter of the new energy vehicle power supply at different scale windows. It then extracts amplitude dispersion values ​​from the frequency domain, calculates the three-phase frequency domain cumulative values, generates frequency domain amplitude dispersion weights, and constructs a multi-scale frequency domain feature matrix and weight matrix. Next, it extracts effective abrupt change values ​​from the time domain, calculates the three-phase time domain cumulative values, generates time domain abrupt change weights, and constructs a multi-scale time domain feature matrix and weight matrix. Finally, it fuses the feature matrix and weight matrix of the same dimension, inputs them into a fault detection neural network for processing, and outputs the power supply health status. This invention improves the sensitivity and accuracy of early power supply fault identification, effectively reducing the probability of false positives and false negatives.

The invention relates to the technical field of inverters. The invention discloses a circuit pre-charging method for an inverter, which is suitable for a single-phase, split-phase or three-phase inverter, and an alternating current port of the inverter can be configured with at least two of a power grid, a diesel generator and an uninterruptible load interface and can be compatible with various alternating current power supply and consumption equipment. The method comprises the following steps: when any path of alternating current power supply is powered on, the alternating current power supply is converted into direct current through the uncontrolled rectifier module, and then the bus capacitor is charged through the current-limiting resistor and the normally-closed bus pre-charging relay in sequence; when the bus voltage rises to an auxiliary power supply starting threshold value, the auxiliary power supply is started, the system detects the state of each alternating current port immediately, the relay corresponding to the unused port is disconnected, and the pre-charging process is completed. According to the invention, an independent pre-charging relay and an auxiliary power supply at a traditional power grid side and a diesel generator side are omitted, full-port pre-charging is realized only through the bus pre-charging relay, the circuit is obviously simplified, and the cost is reduced.

This application relates to the field of power generation technology and provides an overload protection method, a three-phase inverter, and a computer-readable storage medium. The method includes: continuously acquiring the apparent power of each phase of the three-phase inverter during operation; comparing the maximum value of the apparent power of each phase with a preset threshold; incrementing a timing value corresponding to the preset threshold if the maximum value is greater than or equal to the preset threshold; decrementing the timing value if the maximum value is less than the preset threshold and the timing value corresponding to the preset threshold is greater than 0; and controlling all relays in the three-phase inverter to disconnect when the timing value reaches a corresponding preset protection duration, thereby stopping the three-phase inverter from operation. This method solves the problem of no single-phase overload protection in grid-connected and bypass conditions of three-phase energy storage inverters.

A battery management system according to the present disclosure includes a three-phase inverter, and an impedance detecting unit that detects two or more peak voltages of a high frequency signal in a lithium-ion secondary battery and calculates an attenuation characteristic, and detects, from the calculated attenuation characteristic, a real part of an alternating current impedance used to calculate amount of Li deposition, and further includes a control unit that supplies an alternating current signal that is a test signal generated by the three-phase inverter to the lithium ion secondary battery in test mode, and a correction unit that performs correction of a value of peak voltage of the high-frequency signal corresponding to the test signal that is detected by the impedance detecting unit, based on difference between peak voltage of the test signal detected by the impedance detecting unit and a theoretical value of peak voltage of the test signal.

The invention provides a three-level inverter circuit. The three-level inverter circuit comprises a capacitor series network and a three-phase inverter, the capacitor series network comprises a first capacitor and a second capacitor, the first end of the first capacitor is connected with the first end of the second capacitor, and the second end of the first capacitor and the second end of the second capacitor are used for accessing bus voltage; the first input end of the three-phase inverter is connected with the second end of the first capacitor, and the second input end of the three-phase inverter is connected with the second end of the second capacitor; a switching circuit is connected between the phase output point of at least one phase bridge arm of the three-phase inverter and the first end of the first capacitor; the switch circuit comprises two power switch tubes which are connected in a common collector mode, an emitting electrode of one power switch tube of the switch circuit is connected with the first end of the first capacitor, and an emitting electrode of the other power switch tube is connected with a phase output point of a phase bridge arm of the three-phase inverter. According to the three-level inverter circuit provided by the embodiment of the invention, the loss of a switching device can be reduced.

The invention discloses an attention learning mechanism-based inverter model control prediction method, system and device, and a storage medium, and the method comprises the steps: pre-constructing a three-phase inverter simulation model, carrying out the real-time sampling of a state signal through employing an MPC controller, and obtaining a signal characteristic set; performing feature selection on the signal feature set, and extracting feature data; setting a screening threshold to screen the feature data, and taking the screened feature data as optimal features; inputting the optimal feature into a pre-trained machine learning model module to obtain a prediction result of the control signal of the three-phase inverter; the control performance can be improved while more calculation amount and communication traffic are reduced.

The utility model relates to the technical field of inverters, in particular to a power detection circuit of a three-phase inverter, which comprises the three-phase inverter, a voltage detection module, a first analog-to-digital conversion chip, a current detection module, a second analog-to-digital conversion chip and a calculation chip, the voltage detection module, the first analog-to-digital conversion chip and the calculation chip are electrically connected in sequence, the current detection module is used for measuring the three-phase current of the three-phase inverter, and the current detection module, the second analog-to-digital conversion chip and the calculation chip are electrically connected in sequence. According to the utility model, the voltage detection module and the current detection module obtain voltage and current data of the three-phase inverter, isolation acquisition is realized, interference is reduced, data accuracy is ensured, signals are amplified, data processing by a subsequent circuit is facilitated, power is calculated in real time by the calculation chip, and reference is provided for control of the three-phase inverter.

A power conversion apparatus includes: a three-phase inverter converting direct-current power into alternating-current power for a propulsion motor; and a magnetic core. The magnetic core includes: first and second cores penetrated by both a three-phase alternating-current power line and a common mode current circulation line; and a third core penetrated only by the three-phase alternating-current power line. The first core is disposed on a side closer to the three-phase inverter, the second core is disposed on a side closer to the propulsion motor, and the third core is disposed between the first core and the second core. In the first, second, and third cores, when at least one of three electric wires in the three-phase alternating-current power line is drawn out of the second core toward the propulsion motor, the at least one of the three electric wires is not in parallel with remaining one or two electric wires.

The invention discloses a control method and device of a three-phase inverter, the three-phase inverter and a power supply system, and belongs to the technical field of inverters. The control method of the three-phase inverter comprises the following steps: under the condition that the three-phase inverter operates in a three-phase working mode, in response to single-phase default of a power grid, obtaining phase sequence detection information of the remaining two phases in the power grid; based on the phase sequence detection information, phase angle detection information of the remaining two phases is determined; and controlling the three-phase inverter to operate in a two-phase working mode based on the phase angle detection information. The method comprises the steps of obtaining phase sequence detection information of the remaining two phases, determining phase angle detection information of the remaining two phases, and controlling a three-phase inverter to be switched from a three-phase working mode to a two-phase working mode under the condition that a single-phase power failure occurs in a power grid, so that two-phase output of the three-phase inverter is matched with the remaining two-phase operation phases of the power grid, and the power failure of the power grid is avoided. The operation state of the three-phase inverter is maintained, and the waste of photovoltaic power generation resources is reduced.

The present disclosure relates to an apparatus and method for diagnosing a failure, which may include a motor, an inverter for driving the motor, a phase current sensor for respectively detecting a phase current supplied to the motor from the inverter, and a controller for converting the phase current detected by the phase current sensor into a current, obtaining an average value of the current in one cycle and comparing the magnitude and angle of the average value with a reference value to determine a failure of the phase current sensor.

This invention proposes a method and system for diagnosing open-circuit faults in three-phase inverter IGBTs, relating to the technical field of power electronic device fault diagnosis. The method involves lightweight processing of acquired historical data to obtain feature vectors; training a pre-defined three-phase inverter IGBT open-circuit fault diagnosis model based on these feature vectors; real-time acquisition of three-phase current data to be processed, followed by bounded normalization to obtain normalized current amplitudes; and generating IGBT open-circuit fault judgment results based on these normalized current amplitudes. Real-time data related to the three-phase inverter IGBT open-circuit fault is collected based on the IGBT open-circuit fault judgment results, and this real-time data is input into the trained three-phase inverter IGBT open-circuit fault diagnosis model to output the three-phase inverter IGBT open-circuit fault diagnosis results. This invention effectively achieves lightweight, efficient, and accurate diagnosis of three-phase inverter IGBT open-circuit faults.

The invention relates to the technical field of motor control, in particular to a direct-current bus voltage sampling method and a motor controller, which are applied to a permanent magnet synchronous motor controller driven by a three-phase inverter, the positive electrode and the negative electrode of a direct-current bus of the three-phase inverter are p and n respectively, and the output three-phase terminals are a, b and c respectively. The method comprises the following steps: sampling a phase-end voltage signal of at least one phase in a three-phase terminal; performing pre-signal processing on the sampled phase end voltage signal; extracting a direct-current component capable of reflecting the voltage of the direct-current bus from the output after the pre-signal processing; based on the direct-current component, a direct-current bus voltage value is obtained through operation. By directly sampling the phase voltage and indirectly calculating the bus voltage, the system hardware cost is reduced while the low-speed control precision of the motor is ensured, and the method is particularly suitable for permanent magnet synchronous motor driving occasions with requirements for cost and performance.

This invention discloses a fault diagnosis method, system, and device for inverters, relating to the technical field of fault diagnosis. The method involves acquiring the original signal set of a three-phase inverter and performing a Fast Fourier Transform (FFT) to obtain three-phase frequency domain signals. After transforming each three-phase frequency domain signal, the signals are fused to obtain fault image samples, which are then divided into training and testing sets. A preset image set is acquired, and the backbone network is pre-trained to obtain pre-trained weights. These pre-trained weights are then transferred to an improved model to obtain a preset model. The preset model is then fine-tuned to obtain a target model. The target model is tested to obtain classification results and is validated. The three-phase current is transformed to the frequency domain via FFT to highlight harmonic and imbalance characteristics. A two-dimensional fault image is generated using symmetric point pattern fusion. Pre-trained weights and staged transfer fine-tuning reduce dependence on small sample fault data and improve model generalization ability. The improved model achieves accurate classification, improving diagnostic accuracy and generalizability even with scarce samples.

A circuit for controlling a voltage, including: a plurality of traction battery banks; a first switch K1, where a first terminal of the first switch K1 is connected to each of the plurality of traction battery banks; a drive circuit, where the drive circuit includes a three-phase inverter and a three-phase motor, where a midpoint of each of three-phase bridge arms of the three-phase inverter is connected to each of three-phase coils of the three-phase motor respectively, where a first busbar terminal is connected to a positive electrode of each of the plurality of traction battery banks and a positive electrode of a charging port, a second busbar terminal is connected to a negative electrode of each of the plurality of traction battery banks and a negative electrode of the charging port, and where the three-phase motor is connected to a second terminal of the first switch K1.

The invention discloses a dual three-phase motor position sensorless control method and device based on vector decoupling control. The method comprises the following steps: respectively reconstructing a torque plane output voltage and a harmonic plane output voltage so as to obtain a reconstructed torque plane instruction voltage and a reconstructed harmonic plane instruction voltage; vector decoupling coordinate inverse transformation is carried out on the reconstructed torque plane instruction voltage and the reconstructed harmonic plane instruction voltage, so that modulation waves of a first set of stator windings and modulation waves of a second set of stator windings are obtained; and obtaining the on-off state of a three-phase inverter power switch tube corresponding to the first set of stator winding and the on-off state of a three-phase inverter power switch tube corresponding to the second set of stator winding according to the modulation wave. The position-sensorless control of the dual three-phase motor can be realized in a full modulation range, the output voltage of the motor does not need to be sampled, so that the system cost and the debugging complexity are remarkably reduced, the calculation complexity is low, and the engineering realization is easy.

The application provides a three-phase inverter energy and information simultaneous transmission method and device based on a Costas loop, which is based on pulse width modulation to perform four-phase shift keying modulation on a carrier signal, embeds a transmission signal into voltage ripple through power switching tubes of a three-phase inverter, collects three-phase line voltage signals at a load side or a network side, and performs coherent demodulation based on Costas loop synchronization, including primary demodulation of a high-frequency switching frequency, secondary demodulation of a low-frequency three times fundamental frequency, differential decoding after symbol decision of two demodulation results, and finally parallel-serial conversion to obtain output data. Compared with a traditional method, the Costas loop synchronization demodulation technology can accurately track a carrier signal in real time, has good anti-interference ability, has a lower bit error rate, and has small damage to power quality by using a QPSK-PWM modulation method, so that high power quality and high communication accuracy can be realized for energy information simultaneous transmission.

The application discloses a grid-connected three-phase LCL inverter parameter monitoring method for digital twin modeling, comprising: obtaining actual measurement data of the grid-connected three-phase LCL inverter; based on the actual measurement data, iteratively optimizing a monitoring parameter set of a digital twin model of the grid-connected three-phase LCL inverter based on an adaptive particle swarm algorithm, comprising: running the digital twin model under each monitoring parameter set to obtain corresponding multiple groups of model output data, calculating corresponding error objective functions, and taking the monitoring parameter set corresponding to the minimum objective function value as the optimal monitoring parameter set; in response to the error objective function value of the optimal monitoring parameter set being less than a function threshold value, the optimal monitoring parameter set is output as the final optimal monitoring parameter set for subsequent parameter monitoring; otherwise, iteratively optimizing is continued. The high-precision calibration of the digital twin model and the real inverter is realized, so that the key parameters in the real inverter which are difficult to directly measure or have high measurement cost can be calculated in real time.

This invention discloses a control method and system for permanent magnet synchronous motors based on adaptive weights in gradient prediction pulse modes. The method includes: 1) establishing a discretized current gradient prediction model considering delay compensation and motor DC voltage feedback, and reconstructing a reference current trajectory with harmonic characteristics using a nominal optimized pulse mode; 2) designing a degree-of-freedom control logic based on nonlinear mapping to address the performance mismatch problem caused by fixed weights in the prediction cost function; and 3) dynamically adjusting the weighting factor by evaluating the normalized composite index of motor torque and current in real time. During acceleration transients, low weights are used to release the degrees of freedom at the pulse switching moment of the three-phase inverter, accelerating motor torque establishment. During steady-state cruise, high weights are used to strengthen the inverter pulse position constraint, locking in the optimal harmonic distribution. This invention solves the problem of balancing dynamic response and steady-state harmonics in permanent magnet synchronous motors, significantly improving the transient quality and voltage disturbance robustness of the motor control system.

The application provides a photovoltaic accommodation method of a parallel system, and the method comprises the following steps: a current three-phase inverter unit obtains average grid-connected power, average inverter power, average photovoltaic power and average charge-discharge power of each three-phase inverter unit in the parallel system; if the current three-phase inverter unit is a battery unit, target inverter power is determined according to current inverter power and average grid-connected power of the current three-phase inverter unit; if the current three-phase inverter unit is a non-battery unit, load power of the parallel system is determined according to average photovoltaic power, average charge-discharge power, average grid-connected power and the number of units of the parallel system, target inverter power is determined according to the load power and current photovoltaic power of the current three-phase inverter unit; and the current three-phase inverter adjusts inverter power of itself to the target inverter power. Through the above method, the photovoltaic accommodation rate of the parallel system can be improved.

The invention relates to a motor vehicle with motor vehicle-to-grid functionality, comprising an electric machine, a high-voltage battery, an inverter, and a disconnect switch, wherein the high-voltage battery is connected to the inverter to supply the inverter with energy, and the inverter is connected to the electric machine and configured to supply the electric machine with energy, wherein the inverter is configured as a three-phase inverter, wherein the inverter comprises a first inverter circuit configured to supply the electric machine and a second inverter circuit configured to supply the electric machine, wherein the inverter is configured as a resonant inverter, and wherein the electric machine is configured as an open-end winding configuration with split input windings for each of the phases and a three-phase center tap, wherein the center tap is connected to a disconnect switch.

The present invention relates to a fault determination device and method for a vehicle motor. A fault determination device of a drive device including a motor and a three-phase inverter that supplies power to the motor through three-phase electric lines can include a resistor provided in each phase of the three-phase electric lines, a voltage sensing device that senses a voltage across the resistor through a current flowing into the resistor, and a sensing controller that determines whether the resistor is faulty or the three-phase electric lines are open based on a sensed voltage of the voltage sensing device and three-phase currents and of the three-phase inverter.