210 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.

The invention discloses a grid-connected three-phase LCL inverter parameter monitoring method for digital twinning modeling. The method comprises the following steps: acquiring actual measurement data of a grid-connected three-phase LCL inverter; and according to actual measurement data, performing iterative optimization on monitoring parameter sets of a digital twin model of the grid-connected three-phase LCL inverter based on an adaptive particle swarm algorithm, including: operating the digital twin model under each monitoring parameter set to obtain corresponding multiple groups of model output data, and calculating a corresponding error objective function, taking the monitoring parameter set corresponding to the minimum target function value as an optimal monitoring parameter set; if an error objective function value responding to the optimal monitoring parameter set is smaller than a function threshold value, outputting the error objective function value as a final optimal monitoring parameter set, and performing subsequent parameter monitoring; and otherwise, iteration optimization is continued. And high-precision calibration of the digital twin model and the real inverter is realized, so that key parameters which are difficult to directly measure or high in measurement cost in the real inverter are calculated in real time.

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 a permanent magnet synchronous motor nonlinear integral compound control method based on a novel reaching law. The method comprises the following steps: detecting a motor rotating speed omega and position angle information theta; calculating a rotating speed deviation e; transforming to obtain id and iq; calculating a nonlinear integral sliding mode surface s and a novel reaching law to observe a motor rotating speed omega and a load torque TL; calculating an output current given value iq *; performing Park inverse transformation to obtain u alpha and u beta; and performing voltage space vector pulse width modulation to obtain three switching signals of a three-phase inverter, and controlling the permanent magnet synchronous motor. According to the permanent magnet synchronous motor control method, the load disturbance observer and the nonlinear integral sliding mode controller are combined to construct the novel composite sliding mode controller, unknown disturbance can be estimated and compensated timely and accurately, the degree of dependence on high gain is effectively reduced, and the robustness of dealing with the unknown disturbance is remarkably improved.

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 inverter control device: switches, in each carrier cycle, the state of a three-phase inverter among four kinds of use vectors such that the number of switching times is minimized; switches one basic space vector included in the four kinds of use vectors to a different basic space vector every 60-degree electrical angle; and switches a zero vector, which is used at the first timing of each carrier cycle, between two kinds of zero vectors every 60-degree electrical angle. When six electrical angles per one cycle of the inverter at the time of basic space vector switching are regarded as 0, 60, 120, 180, 240, and 300 degrees, six electrical angles per one cycle of the inverter at the time of zero vector switching become the angles obtained by adding, to the six electrical angles at the time of the basic space vector switching, the same prescribed angle of not less than 15 degrees but less than 45 degrees.

The invention discloses a new energy automobile power supply detection method and system, and belongs to the technical field of power supply fault detection. The method comprises the following steps: acquiring three-phase voltage of a three-phase inverter, summing absolute values to obtain a three-phase composite signal, segmenting according to a period, dividing each frame into a left signal section and a right signal section, extracting a morphological feature vector to calculate a time domain morphological mismatch value, and constructing a time domain morphological mismatch matrix; fourier transform is carried out on the left signal segment and the right signal segment, a frequency domain form mismatch value is calculated based on the difference between the frequency gravity centers of the fundamental frequency and the non-fundamental frequency, and a frequency domain form mismatch matrix is formed; and further constructing a time domain and frequency domain form mismatch evolution matrix, processing the matrix by using a double-domain collaborative enhancement neural network, and finally outputting a power supply fault score. Through collaborative analysis of the time domain and frequency domain features and evolution matrix construction, the fault detection precision of the new energy automobile power supply is effectively improved.

The invention discloses a three-phase inverter few-sensor model prediction control method and device. The method comprises the following steps: acquiring voltage and current sample data based on a three-phase inverter model prediction control system; aiming at the sample data, constructing and training a neural network; and voltage and current signals are calculated by adopting a neural network, and model prediction control is implemented. According to the designed method, the number of sensors of the three-phase inverter model predictive control system is reduced, and the anti-interference performance of the system is improved.

A kind of multi-line power quality treatment and power flow transfer device and control method, the device includes first regulating module, second regulating module and shared DC bus, first regulating module and second regulating module present upper and lower symmetrical structure;Two regulating module structures are same, and all are three-winding transformer primary winding and medium voltage AC bus connection, the first secondary winding of three-winding transformer is connected with first load through the secondary winding of first series transformer connected in series, the primary winding of first series transformer is connected with the AC end of first three-phase inverter;The AC end of three-phase rectifier is connected with the secondary winding of three-winding transformer;Medium voltage AC bus is connected with second load through the secondary winding of second series transformer connected in series, the primary winding of second series transformer is connected with the AC end of second three-phase inverter.The present application solves the increasingly complex power quality demand of decoupling regulation and mutual aid, multi-working condition in distribution network facing multi-feed line.

The application discloses a stability analysis method of a photovoltaic energy storage micro-grid in an islanding scenario based on system admittance characteristics, and belongs to the technical field of distributed new energy grid-connected power generation. The method comprises the following steps: determining the main circuit filter type and control structure of a three-phase inverter of a power generation unit; establishing a second-order admittance model of the inverter based on a harmonic linearization method; decoupling the second-order admittance model to obtain linear admittance models under positive and negative sequences; establishing the voltage-current relationship at a system point of common coupling based on a node voltage method according to the topological structure of the micro-grid, and obtaining a system admittance matrix; drawing the amplitude-frequency curve and the phase-frequency curve of key items in the system admittance matrix, determining the key characteristic frequency corresponding to the minimum point of the amplitude-frequency curve, and determining the stability of the system according to the positive and negative of the slope of the phase-frequency curve at the key characteristic frequency. The method can accurately analyze the stability of the photovoltaic energy storage micro-grid in the islanding operation scenario.

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 provides a grid-connected inverter control method and device based on deep reinforcement learning. The method comprises the steps of determining three-phase reference current of a power grid based on phase information of power grid voltage and expected power of the power grid; constructing a state space about a three-phase current state based on the obtained actual three-phase current of the power grid and the three-phase reference current; an action space is constructed, and the action space comprises on and off action values of each power switch tube in a three-phase inverter of the power grid; and inputting the state space into a pre-constructed target model, so that the target model is combined with an action space to obtain a control strategy for controlling turn-off or turn-on of the power switch tube, and the target model is a deep neural network model supporting deep reinforcement learning. The state space matching module is used for matching and outputting a control strategy for controlling each power switch tube to be switched off or switched on at least according to an input state space; and controlling the three-phase inverter based on the control strategy.

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.

The application discloses a permanent magnet synchronous motor speed and current model-free control method based on an improved second-order hyperlocal model, collects three-phase currents of the permanent magnet synchronous motor, constructs a second-order sliding mode observer on a mechanical angular velocity and total disturbance of the system based on an improved second-order hyperlocal model model-free sliding mode speed controller MFSMSC, observes the mechanical angular velocity and the total disturbance of the system, designs an adaptive approach law of a variable boundary layer and a second-order integral sliding mode surface, and obtains a q-axis current reference signal; the q-axis current reference signal is output to a model-free predictive current controller MFPCC based on the improved second-order hyperlocal model, dq-axis reference voltages are obtained, after inverse Park conversion, alpha-beta-axis stator voltage reference vectors are obtained, three-phase inverter switching driving signals are obtained through SVPWM operation, six switching tubes of the three-phase inverter are driven to be turned on and turned off, and then the three-phase winding currents of the permanent magnet synchronous motor are adjusted. The application adopts a classical cascade control architecture with a speed loop outer loop and a current loop inner loop, the improved second-order hyperlocal model improves disturbance estimation accuracy, and the improved second-order hyperlocal model enhances the suppression performance on high-frequency noise, and the MFPCC based on the improved second-order hyperlocal model improves the robustness of the system to motor parameter perturbation.

A compensation system and method for a zero-crossing voltage of back electromotive force of a brushless direct current motor (BLDCM) are provided. The compensation system includes: a direct current power supply; a three-phase inverter, connected to the direct current power supply and the BLDCM; a back electromotive force detection module configured to detect terminal voltages of three phases when the BLDCM is in operation; and a controller, connected to the three-phase inverter through the back electromotive force detection module. The compensation system further includes a current acquisition module connected between the direct current power supply and the controller, and the current acquisition module is configured to acquire a bus current value when the BLDCM is in operation; the controller includes a voltage compensation module connected to the back electromotive force detection module. A bus current threshold is preset in the voltage compensation module.

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.

To provide a motor driver capable of realizing sensor-less control by sine wave drive by utilizing current flowing in a three-phase inverter.SOLUTION: A motor driver includes: a PWM signal generation unit 42 that generates a PWM signal for sine wave energization driving, and stops generation of a PWM signal of one specific phase (a W-phase), and generates the PWM signal of the other two phases (a U-phase and a V-phase) at a fixed duty ratio in a specific section (from 30 degrees to 60 degrees) of an electrical angle as a rotor position estimation period; and a current phase determination unit 45 that determines whether it is an advanced phase or a delayed phase based on current flowing through an inverter circuit 3 in the rotor position estimation period. The PWM signal generation unit 42 increases a duty ratio of the PWM signal when determination results by the current phase determination unit 45 is the advanced phase, and decreases the duty ratio of the PWM signal when determination results by the current phase determination unit 45 is the delayed phase.SELECTED DRAWING: Figure 1

The application relates to a decoupling control system of a salient pole permanent magnet synchronous motor, wherein the direct-axis inductance of the salient pole permanent magnet synchronous motor is greater than the cross-axis inductance, the limit condition that the direct-axis current i d , the cross-axis current i q and the rotating speed omega r of the motor satisfy is determined, the calculation method of the leading angle alpha of the armature reaction magnetic flux relative to the stator magnetic motive force is determined, and the decoupling control and method of the direct-axis current and the cross-axis current are determined, and the control system comprises a three-phase inverter, a control module, a speed and position detection device and the like.

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 control device for a three-phase inverter of a vehicle prime mover is configured to activate active discharge of a DC link of the inverter and at the same time to switch on the lower half-bridge switches of the inverter during the active discharge, and to switch on an upper half-bridge switch of the inverter. The three-phase inverter has three half-bridges, each having an upper half-bridge switch and a lower half-bridge switch.