83 results about "Permanent magnet synchronous generator" patented technology

The invention belongs to the technical field of permanent magnet synchronous generator demagnetization fault detection, and particularly discloses a permanent magnet motor fault early warning system based on big data, which comprises a high-frequency injection and grid-connected control module, a fault early warning module and a fault early warning module, actively injecting a high-frequency disturbance signal of which the frequency is higher than the fundamental frequency into a control loop of the permanent magnet synchronous generator; the multi-source synchronous acquisition module is used for synchronously acquiring multi-dimensional operation parameters of the permanent magnet synchronous generator and performing time domain alignment and frequency domain separation on the multi-dimensional operation parameters to obtain synchronous acquisition signals; the composite feature extraction module is used for extracting a multi-dimensional demagnetization criterion of the permanent magnet synchronous generator based on the synchronous acquisition signal; the self-adaptive threshold regression prediction module is used for performing fusion evaluation on the multi-dimensional demagnetization criteria by using the demagnetization health index model to generate a demagnetization judgment result of the demagnetization degree of the permanent magnet synchronous generator; the method has the advantages that the demagnetization recognition accuracy is improved, and early warning is achieved.

The invention discloses an air suspension turbine power generation and refrigeration integrated device which comprises a shell, a stator and a rotor spindle, the rotor spindle is rotationally arranged in the shell through a bearing assembly, the stator is fixed in the shell and is coaxial with the rotor spindle, and an air gap exists between the stator and the rotor spindle to form a permanent magnet synchronous generator. The rotor further comprises a first-stage volute, a second-stage volute, a first-stage radial flow turbine, a second-stage radial flow turbine, a volute connecting pipe and a cooling water jacket, the first-stage volute and the second-stage volute are fixed to the two ends of the shell respectively, and the first-stage radial flow turbine and the second-stage radial flow turbine are coaxially fixed to the two ends of the rotor spindle respectively and are arranged back to back; the first-stage radial flow turbine is located in the first-stage volute, the second-stage radial flow turbine is located in the second-stage volute, the first-stage volute is provided with a high-temperature and high-pressure air inlet and a first-stage air outlet, and the second-stage volute is provided with a second-stage air inlet and an expansion cooling air exhaust port; the device has the advantages of being capable of stably running at a high speed in a high-altitude low-pressure environment and simultaneously achieving efficient power generation and refrigeration functions.

The invention discloses a control method, device, equipment, medium and product of a network-forming type permanent magnet wind power system, and the method comprises the steps: calculating the maximum wind energy tracking power outputted by the network-forming type permanent magnet wind power system under the optimal wind energy tracking based on the maximum wind energy tracking coefficient; calculating a direct-current voltage damping control coefficient of a side damping controller according to the inertia coefficient and the damping coefficient of the direct-current voltage; calculating an electromagnetic power reference value output by the permanent magnet synchronous generator according to the maximum wind energy tracking power and the DC voltage damping control coefficient; and subtracting the electromagnetic power reference value from the electromagnetic power actual value, and inputting the difference value into a machine side active power controller so as to adjust the electromagnetic power output by the permanent magnet synchronous generator. According to the method, on the basis of not adding hardware equipment, the transient stability of the grid-forming type permanent magnet wind power system during the short-circuit fault period of the power grid can be remarkably improved only by changing the control strategy of the machine-side converter of the grid-forming type permanent magnet wind power system.

The invention discloses a virtual impedance compensation method for permanent magnet synchronous generator constant admittance modeling, and relates to the technical field of electromagnetic transient modeling of permanent magnet synchronous generators, and the method comprises the steps: firstly, carrying out the discretization of a permanent magnet synchronous generator model; secondly, decomposing the equivalent resistance matrix into a time-invariant part and a time-varying part; then, virtual impedance is added to the q axis of the generator model; thirdly, constructing a generator constant admittance model; thirdly, a converter accompanying discrete circuit model is integrated, a complete permanent magnet synchronous generator constant admittance model is formed, and a node admittance equation is established based on the Kirchhoff's current law; and finally, executing electromagnetic transient simulation. According to the method, constant admittance modeling is achieved based on virtual impedance compensation, the requirement for real-time inversion of a time-varying admittance matrix is eliminated, simulation calculation resource consumption is remarkably reduced, small errors are kept under various working conditions, and efficient simulation of a large-scale permanent magnet synchronous generator system is supported.

The invention relates to the technical field of permanent magnet direct-drive fans, and discloses a permanent magnet direct-drive fan modeling method considering a mechanical system and related equipment. A mechanical system transfer function and a complete electrical system transfer function including a permanent magnet synchronous generator stator loop, a machine side converter, a grid side inverter and the like are established; a permanent magnet direct drive fan small signal admittance model is constructed, the defect that a previous model neglects a mechanical system or part of an electrical system is made up, the model can accurately reflect the influence of mechanical shafting dynamic characteristics on harmonic transmission of an electrical subsystem through electromagnetic torque disturbance, and the accuracy of the fan broadband admittance model is improved. A reliable basis is provided for broadband oscillation analysis of an offshore wind power plant grid-connected system, the new energy delivery capacity is improved, and safe and stable operation of a novel electric power system is guaranteed.

The application discloses a pitch angle control method considering fast active power regulation of a wind driven generator, which can reduce pitch angle fluctuation of all PMSGs during fast active power control, minimize fatigue damage of the wind driven generator, prolong the service life of the wind driven generator and reduce maintenance cost. P ; S2, a wake effect model of the wind farm containing mathematical models of the plurality of PMSGs is constructed to determine a plurality of pitch angles beta from the power coefficient c P ; and S3, a fast active power control model of the wind farm is constructed to satisfy minimum pitch angle beta fluctuation of the PMSGs.

This invention discloses a maximum power point tracking (MPPT) control system and method for a pump-driven turbine power generation system. It calculates output power by acquiring DC-side voltage and current, and also acquires rotational speed. Within each MPPT cycle, the operating state is identified by the power-speed slope feature G: when operating conditions change rapidly, the weight of the disturbance observation branch is increased; when approaching the maximum power point, the weight of the adaptive scale fuzzy logic control branch is enhanced. The two branches achieve branch current fusion according to the weights constructed using (|G|), outputting the q-axis stator current increment. A dq current closed loop is used to output a PWM drive signal to control the machine-side converter, adjusting the electromagnetic torque of the permanent magnet synchronous generator, thereby achieving efficient MPPT under time-varying head / flow conditions. This invention relies only on measurable power and speed signals, requiring no precise hydraulic model or data-intensive training, resulting in low computational load, ease of embedded implementation, improved energy recovery efficiency, and suppression of power fluctuations and torque pulsations.

The application discloses a kind of model construction method and device of wind power generation system, the method wind power generation system, at least including wind turbine and permanent magnet synchronous generator, the method includes: the mechanical characteristics of wind turbine is modeled according to momentum theory data to obtain wind turbine model;Maximum power output point of wind turbine is tracked by analyzing wind turbine model and using hill climbing search method;Ideal conditions met by permanent magnet synchronous generator are obtained;Under ideal conditions, three-phase voltage equation under natural coordinate system, flux linkage equation under natural coordinate system, electromagnetic torque equation of motor, mechanical motion equation of permanent magnet synchronous generator are established to obtain permanent magnet synchronous motor model.The application can reduce the loss generated by mechanical rotation in power generation process, so that the power generation efficiency of system is higher.

A single-stage high-speed pipeline turbine generator set for natural gas pipeline and design method, the invention relates to a single-stage high-speed pipeline turbine generator set and design method, and belongs to the technical field of turbine expander power generation. In order to solve the problem that the auxiliary system of the natural gas overpressure turbine generator set in the prior art occupies a large proportion of the land area, the natural gas radial turbine expander and the high-speed permanent magnet synchronous generator are coaxially arranged, the natural gas radial turbine expander cooperates with the high-speed permanent magnet synchronous generator through a rotating shaft to generate power, and the natural gas radial turbine expander and the high-speed permanent magnet synchronous generator are installed on the natural gas pipeline. Natural gas turbine expander: thermal calculation is carried out, then three-dimensional modeling of the impeller is completed, analysis and optimization are carried out through CFD software, the key component impeller is made of titanium alloy, five-axis linkage high-speed milling is adopted for forming, motor selection is carried out according to the parameters of the expander, iteration optimization is carried out, and the generator design is completed.

The invention discloses a novel offshore wind power generation system control method based on a disturbance observer, and relates to the technical field of permanent magnet synchronous wind power generator control. The method comprises the following steps: constructing a mathematical model of a wind turbine, and designing a maximum power tracking module; constructing a mathematical model of the permanent magnet synchronous generator; designing a disturbance torque observer, and introducing a low-pass filter to improve the observation precision; designing a sliding mode controller based on a double-exponential reaching law; and combining the output values of the sliding mode controller and the disturbance torque observer as a q-axis current instruction to control the rotating speed of the permanent magnet synchronous generator. According to the method, the maximum power point of the wind turbine is captured, the air disturbance torque is estimated and compensated, accurate and rapid tracking of the rotating speed of the rotor matched with the maximum power point of the wind turbine is achieved through the novel double-exponential sliding mode controller, and the wind energy conversion efficiency is improved. And the anti-interference capability of the wind power generation system is enhanced in a complex marine environment.

The technical scheme belongs to the technical field of new energy power generation, and particularly relates to a flexible starting type ocean current energy power generation device suitable for a low-flow-speed environment, which comprises a shell, a main transmission shaft, an impeller, a planar magnetic coupling module, a ball screw module and a permanent magnet synchronous generator, the front end of the main transmission shaft extends out of the shell and is connected with the impeller; the rear end of the main transmission shaft is connected with the impeller end plane magnetic coupling; the permanent magnet synchronous generator is installed on the ball screw module and connected with the motor end plane magnetic coupling. The permanent magnet synchronous generator and the motor end plane magnetic coupling are driven by the ball screw module to be close to or far away from the impeller end plane magnetic coupling, flexible joint and separation of the magnetic coupling are achieved, and therefore stable starting of the generator is completed in the low-flow-speed environment, and the impeller is matched with the permanent magnet synchronous generator to convert ocean current energy into electric energy. The device has the advantages of low starting flow velocity, flexible starting and the like, and is suitable for development and utilization of low-speed ocean current energy.

The invention belongs to the field of permanent magnet synchronous generators, and relates to a permanent magnet synchronous motor topological structure and a wide variable speed power generation method. The topological structure of the permanent magnet synchronous motor comprises three-phase windings, three winding switching devices, a three-phase uncontrolled rectifier bridge and a DC-DC converter, each winding in the three-phase windings is divided into two sub-windings which are connected in series, the negative ends of the three-phase windings are connected to serve as neutral points, one end of each winding switching device is connected with one bridge arm of the three-phase uncontrolled rectifier bridge, and the other end of each winding switching device is connected with the other bridge arm of the three-phase uncontrolled rectifier bridge. The other end of each winding switching device is connected with the positive end of the first sub-winding or the positive end of the second sub-winding of the corresponding phase, the output end of the three-phase uncontrolled rectifier bridge is connected with the input end of the DC-DC converter, and the output end of the DC-DC converter serves as output.

The application relates to the field of wind power generation technology and provides a permanent magnet synchronous generator and a high-altitude wind power generation system.The permanent magnet synchronous generator comprises a rotor and a stator; the rotor is provided with permanent magnets; the stator is coaxially sleeved outside the rotor and comprises a plurality of stator modules; the plurality of stator modules are arranged along the circumference of the rotor; each stator module constitutes an independent three-phase power generation unit and has an independent neutral point; the stator module comprises a shell, a stator core and three-phase windings; the stator core is connected with the shell; the stator core is formed with a plurality of installation grooves which are arranged at intervals along the circumference of the rotor; and the three-phase windings are installed in the installation grooves; the three-phase windings of each stator module adopt a single-layer concentrated winding structure; each phase winding in the three-phase windings is contained in two adjacent installation grooves in the stator module; and only the winding of a single phase is contained in each installation groove. The application reduces the weight of the permanent magnet synchronous generator, thereby realizing long-time stable power generation.

The invention discloses a permanent magnet synchronous generator fault diagnosis method based on a multi-mode attention residual network model, and relates to the technical field of generators, and the method comprises the steps: obtaining a stator vibration signal and a three-phase current signal of a permanent magnet synchronous generator; performing continuous wavelet transform on the stator vibration signal to generate a vibration time-frequency diagram; performing complex component method processing on the three-phase current signal to generate a current complex component trajectory diagram, and calculating an average roundness error of the trajectory diagram; taking the vibration time-frequency diagram and the current complex component trajectory diagram as dual-channel input, and inputting the dual-channel input into a multi-modal attention residual network model for feature extraction to obtain a dual-channel feature diagram; splicing and flattening the dual-channel feature maps to obtain a one-dimensional feature vector; splicing the one-dimensional feature vector and the average roundness error to form a fused feature vector; and inputting the fusion feature vector into a classifier, and outputting a fault diagnosis result. The method can accurately identify the fault of the permanent magnet synchronous generator.

The invention relates to the technical field of aircraft power generation, and discloses a power generation system of an unlimited continuous underwater aircraft, which comprises a main body frame, a wave energy capturing unit, a solar power generation unit, a transmission and power generation unit and a control and energy storage unit, the main body frame adopts a corrosion-resistant steel structure, a latticed photovoltaic mounting area is arranged at the top of the main body frame, and reinforcing ribs and connecting seats connected with the rotary wings are arranged below the main body frame; the wave energy capturing unit comprises rotary wing modules symmetrically arranged on the two sides of the main body frame. A wave energy capturing unit and a solar power generation unit are compositely integrated, an impeller type capturing piece and a permanent magnet synchronous generator are driven by reciprocating swing of rotary wings on the two sides to operate cooperatively, and meanwhile flexible solar cell modules are arranged on the top of a main body frame and the surfaces of the two wings. Parallel collection and complementary power supply of wave energy and solar energy on the same carrier are realized, and all-weather and multi-mode energy capture and continuous power supply of an underwater vehicle in a complex marine environment are realized.

The invention discloses a phase-locked loop control method of a permanent magnet synchronous generator, which belongs to the technical field of motor control and wind power generation, and comprises the following steps: acquiring two-phase current and two-phase voltage under a static coordinate system, and calculating through a sliding-mode observer to obtain a shaft and an extended counter electromotive force estimated value of the shaft; designing a finite position set phase-locked loop based on Taylor series and a Newton iteration method, performing quadrant judgment and correction processing on a rotor position estimation value after primary iteration to obtain a final rotor position estimation value, performing differential operation on the final rotor position estimation value, and processing a differential result by using a low-pass filter to obtain a final rotor position estimation value; obtaining a rotating speed estimation value of a rotor, and integrating the sliding-mode observer and a finite position set phase-locked loop to a motor vector control system to realize position sensorless control; according to the phase-locked loop control method of the permanent magnet synchronous generator, the calculation burden is greatly reduced while the precision is ensured.

The invention provides a diesel-electric hybrid power assembly capable of adapting to an extremely cold environment, and relates to the technical field of power equipment. The assembly comprises a V-shaped eight-cylinder high-pressure common-rail diesel engine, a 35kW permanent magnet synchronous generator and a diesel-electric hybrid power assembly controller which are coaxially connected in series through a Gisinger elastic coupling, and a modular integrated design is adopted. The diesel engine adopts a V-shaped 90-degree layout, comprises an engine body assembly, a cylinder cover assembly, a crank connecting rod mechanism and the like, and is equipped with an air inlet heating module, a 160MPa high-pressure common rail system and a-68 DEG C cooling / lubricating adaptive component; the generator has a starting and generating integrated function, and the low-temperature starting torque is 400 Nm; and the diesel-electric hybrid power assembly controller realizes electromechanical cooperative control. The problems that a power assembly is difficult to start and low in efficiency in an extremely cold environment are solved, stable operation at-56 DEG C to + 50 DEG C can be achieved, and the power assembly is suitable for equipment such as vehicles and engineering machinery in severe cold areas and has the advantages of high reliability and energy efficiency.

The application discloses a kind of adjustable blade vertical axis ocean current energy conversion module and ocean current energy generating device, adjustable blade vertical axis ocean current energy conversion module is symmetrically set with the array of double adjustable blade vertical axis water turbine of guide vane, can realize the improvement of ocean current energy conversion efficiency, adjustable blade vertical axis ocean current energy conversion module is connected with flow velocity self-adapting power generation module and is installed in floating intelligent regulating platform to form ocean current energy generating device, axial flux permanent magnet synchronous generator is matched with electronic unit control system to form flow velocity self-adapting power generation module, so that the device generates electricity stably, the direction adjusting mechanism loaded by floating intelligent regulating platform can meet the direction change demand of adjustable blade vertical axis ocean current energy conversion module.The application solves the problems of low energy conversion efficiency and unstable power generation of existing ocean current energy generating device, realizes the improvement of ocean current energy conversion efficiency and power generation quality, and enhances the survivability of device.

This invention discloses a modeling and application method for a state-space small-signal model of a direct-drive permanent magnet wind power grid-connected system under AC asymmetric operating conditions. The modeling method includes establishing mathematical models of each core component of the direct-drive permanent magnet wind power grid-connected system; converting the mathematical models of the AC-DC-AC power converter and filter circuit to obtain the corresponding dq-sequence dynamic phasor models; processing the mathematical models of the wind turbine shaft system, permanent magnet synchronous generator, phase-locked loop, and turbine-side converter control system at the steady-state operating point to obtain a linear time-invariant model; processing the mathematical models of the phase sequence separation stage, grid-side converter control system, and the dq-sequence dynamic phasor model to obtain a linear periodic time-varying model; and integrating the linear time-invariant model and the linear periodic time-varying model to obtain the state-space small-signal model. The state-space small-signal model obtained by this invention can accurately and completely characterize the small-disturbance characteristics of a direct-drive permanent magnet wind power grid-connected system under AC asymmetric operating conditions.

The invention discloses a wind wave energy integration system combining an oscillating water column and a floating fan, and relates to the technical field of wind wave energy integration utilization, comprising: a floating foundation module which is of a semi-submersible triangular truss structure and is fixed through an anchoring system; the oscillating water column energy conversion module is arranged on the outer side of the buoyancy chamber, comprises a gas water chamber, an adjustable guide plate and a bidirectional pneumatic turbine, and is matched with a permanent magnet synchronous generator; the floating type fan module is arranged on the central truss and comprises a three-blade horizontal shaft fan, a hydraulic variable pitch system and a permanent magnet direct drive generator; the energy management module comprises a rectification unit, an inversion unit, a hybrid energy storage unit and a monitoring unit and is used for realizing smooth power output; the posture stabilizing module is provided with 4-6 hydraulic active stabilizing fins and a posture sensor, and the inclination angle of the floating body is controlled within + / -5 degrees. The energy utilization efficiency and the output stability are improved, the anti-storm capacity is enhanced, the anti-corrosion service life is prolonged, the cost is reduced, the device adapts to multiple sea conditions, and support is provided for large-scale development of storm energy.

There is described a method of determining a rotor position indicator (166, theta), in particular a rotor electrical angle, of an electrical machine (100) having a stator (102) and a rotor (103), in particular of a wind turbine (160), in particular of a permanent magnet synchronous generator, the method comprising: receiving encoder measurement data (168) regarding a rotor position from an incremental mechanical encoder (127), the incremental mechanical encoder is mounted so as to sense a relative rotor position; receiving Hall effect sensor measurement data (169) from at least one, in particular at least three, Hall effect sensors (120), in particular binary sensors, which are mounted at the stator (102) in order to sense magnetic field variations; the rotor position indicator (166) is determined based on the encoder measurement data (168) and the Hall effect sensor measurement data (169).

This application discloses a voltage control method and apparatus for a permanent magnet synchronous generator based on active disturbance rejection control (ADRC), relating to the field of permanent magnet generators. The method includes: constructing a first extended state observer; adjusting the derivative of the observed values ​​according to the error between the state variables and their corresponding observed values, and constructing a second extended state observer based on the first extended state observer; constructing a disturbance observer based on a second-order linear model, and compensating the disturbance observed by the disturbance observer to the second extended state observer using a compensation model to obtain a third extended state observer; and obtaining the control law for the q-axis current based on the third extended state observer. This method improves the extended state observer by addressing the error between each state variable and its observed values, effectively enhancing the system's dynamic performance. Furthermore, by using an additional disturbance observer to observe system disturbances and compensate them for by the extended state observer, the disturbance estimation burden on the extended state observer is reduced, improving the estimation accuracy.

The application provides a green offshore pumped storage energy, phase modulation and power generation system, which comprises a wind turbine or a wind turbine group, an offshore water tower, a water turbine, an excitation or permanent magnet synchronous generator and a water pumping pump, the excitation or permanent magnet synchronous generator is located in the offshore water tower, the wind turbine or the wind turbine group is located at the top of the offshore water tower or is distributed around the offshore water tower, the vertical excitation or permanent magnet synchronous generator is coaxially connected with the water turbine, a lower water outlet with a volute is arranged in the offshore water tower, a water storage tank is arranged above the offshore water tower, a tower water chamber, a tower water outlet channel, a sea outlet, a water inlet and corresponding valves and related circuit structures are arranged below the offshore water tower. The system can realize a novel offshore energy utilization, integrates offshore pumped storage energy, offshore power generation and offshore phase modulation into a unified structure, takes into account the operation state of the land power grid, fully utilizes offshore resources and improves the utilization rate of wind power generation.

The invention belongs to the technical field of stability analysis of a permanent magnet synchronous generator system, and aims to solve the problems that a current wind power system cannot avoid noise generation under complex operation conditions, but the research on the stability of the system is less for the noise in the PMSG system. According to the method for researching the random stability and the random bifurcation behavior of the permanent magnet synchronous generator system under the excitation of the color noise, disturbance of random factors such as airflow fluctuation on mechanical torque of the permanent magnet synchronous generator system is described by introducing the color noise, and then the permanent magnet synchronous generator system is established; an Itstochastic differential equation of the system is obtained through a color noise unified approximation principle, a center manifold theory, polar coordinate transformation and a random average method; the random stability and the random bifurcation behavior of the system are discussed according to a maximum Lyapunov index and a probability density function method. A numerical simulation result further verifies the effectiveness and reliability of the research method.

The invention discloses a high-torque low-mutual-inductance multiphase permanent magnet synchronous generator and a stator structure design method thereof, and belongs to the field of permanent magnet generators. The stator is composed of six modules in space, magnetic barriers are arranged among the modules, windings of each phase of the generator are independently distributed on the stator modules, obvious modular distribution characteristics are achieved in space, mutual inductance is close to zero, and the generator has excellent inter-phase independence. On the basis of the spatial distribution characteristics of the windings, a novel stator topological structure based on two-time offset of stator teeth is provided by utilizing the characteristic that the number of rotor pole pairs of a vernier type permanent magnet generator, so that the offset amplitude of the stator teeth is relatively small, and obvious sacrifice on the area of a stator slot is avoided; moreover, the novel stator structure can further effectively improve the average torque of the generator, greatly reduces the iron core loss of the generator, and widens the application prospect of the permanent magnet vernier generator in the low-speed large-torque field.

The invention discloses a multi-phase permanent magnet synchronous generator winding open-circuit fault prediction and diagnosis method and device, and the method comprises the steps: collecting the six-phase current and electrical angle of a dual three-phase generator, converting the six-phase current into a static coordinate system, and converting the six-phase current into a synchronous rotating coordinate system in combination with the electrical angle; the bus voltage stabilization control module adopts PI current decoupling control to obtain d-axis and q-axis voltage instructions, and the duty ratio of each bridge arm of the rectifier is calculated through space voltage vector modulation; obtaining a theoretical value of each phase voltage according to the duty ratio and the real-time bus voltage, substituting the theoretical value into a dual three-phase generator prediction model under a natural coordinate system, calculating a phase current value of a winding at the next moment, solving a residual error of a sampling current and a predicted current, and carrying out filtering and normalization processing; and learning a residual mean value and a standard deviation in a healthy state and constructing a dynamic adaptive threshold, and when a normalized residual exceeds the threshold, determining an open-circuit fault phase. According to the invention, the open-circuit fault of the winding can be quickly positioned under a complex working condition, and the anti-noise and anti-transient interference capabilities are high.

The present application relates to the technical field of electric vehicle range extending power generation, in particular to an intelligent circulating range extending power generation method for electric vehicles, which generates power by driving a permanent magnet synchronous generator with a driving motor of an electric vehicle, outputs 12V-36V direct current, and after voltage stabilization by a module voltage stabilizer, intelligent control by a programmable controller, and precise voltage increase by a direct current step-up transformer, outputs direct current voltage matching the battery or driving system of the electric vehicle, and selectively supplies power to the battery or directly to the driving system through a two-way switching switch, forming a closed loop cycle of power generation, processing and supply. The method continuously generates power when the electric vehicle is running or idling, without the need for external charging equipment, effectively improving the driving range; the controller monitors the voltage in real time and has overvoltage protection and fault self-detection functions, the step-up transformer adjusts the output voltage steplessly, and is suitable for electric vehicles of different voltage grades; the whole is integrated conveniently, stable in operation, and high in power conversion efficiency; the present application is suitable for various electric two-wheeled, three-wheeled and four-wheeled vehicles.

This invention proposes a method and system for real-time prediction of the electromagnetic state of a permanent magnet synchronous generator (PMSG), belonging to the technical field of real-time prediction of the electromagnetic state of PMSG. The method includes: real-time measurement of the rotor speed, rotor position angle, and three-phase winding current of the PMSG; conditioning and converting the real-time measured signals to obtain a processed operating condition vector; acquiring a pre-trained model; and inputting the real-time pre-processed operating condition vector into the pre-trained model for forward propagation, simultaneously obtaining high-dimensional electromagnetic field quantities and electromagnetic scalars within milliseconds.

The application relates to a permanent magnet synchronous generator power generation voltage stabilization control strategy considering high-resistance contact faults, and steps are as follows: based on a dq rotating coordinate system, a permanent magnet synchronous generator mathematical model considering high-resistance contact faults is established; combined with the permanent magnet synchronous generator mathematical model considering high-resistance contact faults, an instantaneous power equation considering high-resistance contact faults is derived based on instantaneous power theory; combined with the instantaneous power equation considering high-resistance contact faults, a quantitative relationship between a direct-current terminal voltage double-frequency ripple and a cross-axis current is derived based on a small signal analysis method; combined with the quantitative relationship between the direct-current terminal voltage double-frequency ripple and the cross-axis current, a cross-axis current integral average compensation method is designed by taking the characteristic that a sine signal is integrated to zero in an integral period, and a compensated current is obtained to perform permanent magnet synchronous generator power generation voltage stabilization control. The application can inhibit the double-frequency ripple of the cross-axis current, and further reduce the double-frequency ripple of the direct-current terminal voltage, so that the purpose of voltage stabilization control is achieved.

The invention discloses a permanent magnet synchronous generator MPCC control method and system. The method comprises the steps that output data of a permanent magnet synchronous generator are collected; establishing a system time domain equation, and preprocessing the system time domain equation according to the output data to obtain a system model prediction equation; correcting an error of an actual control system based on the system model prediction equation; and performing rolling optimization on the error corresponding to each voltage vector by using a value function based on a current error to obtain an optimal switching vector which minimizes the value function, and acting the optimal switching vector on a machine side rectifier to complete control on the permanent magnet synchronous generator. The method has better dynamic response characteristics and anti-interference performance.