148 results about "Permanent magnet synchronous generator" patented technology

The invention relates to a dual three-phase permanent magnet synchronous generator rectification system and a direct current voltage stabilization control method thereof. Comprising a dual three-phase permanent magnet synchronous generator, a VSD decoupling converter, a load current observer, a dynamic load feed-forward compensator, a voltage closed-loop controller, a dead-beat predictive current controller, a maximum four-vector SVPWM modulation module and a six-phase rectifier. The double-three-phase topological structure adopted by the invention has the advantages of multiple control degrees of freedom, high reliability and the like. A dynamic load feed-forward compensator is constructed to perform dynamic feed-forward compensation on quadrature-axis current of the motor, so that the recovery time of bus voltage is shortened, and the voltage fluctuation amplitude is reduced; the designed dead-beat predictive current controller optimizes the dynamic characteristics of a current loop, improves the torque tracking performance of the motor, and further improves the voltage stabilization regulation capability of the system. The designed load current observer realizes the analysis redundancy of current detection and improves the reliability of the system.

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 provides a horizontal-shaft multi-barrel type wind power generation device and a using method thereof.The horizontal-shaft multi-barrel type wind power generation device comprises at least one rotating shaft and a plurality of hollow barrels which are sequentially arranged in the axial direction of the rotating shaft, and a plurality of inclined ventilation holes are formed in the surface of each barrel; positive and negative pressure difference generated by the ventilation holes drives the barrel bodies to rotate around the rotating shaft, the multiple barrel bodies are arranged at intervals to achieve cascade driving of wind energy, the rotating shaft is connected with a power generator, and the power output of the power generator is adjusted through a microprocessor control system. Through the hollow barrels sequentially arranged along the rotating shaft and the vent holes obliquely formed in the barrels, the barrels are driven to rotate through the wind pressure difference, and wind energy is effectively captured. Adjacent barrel bodies are arranged at proper intervals, airflow interference is avoided, and the wind energy conversion efficiency is improved. The rotating shaft is directly connected with the permanent magnet synchronous generator, efficient mechanical energy-to-electric energy conversion is achieved, and the system stability is high.

A subsynchronous oscillation suppression method for a direct-driven wind turbine generator comprises the following steps that a simulation model for connecting the direct-driven wind turbine generator to a weak alternating current system is constructed, and the simulation model is composed of a main circuit of the direct-driven wind turbine generator, a control system and an alternating current power grid; the direct-driven wind turbine generator set comprises a wind turbine, a permanent magnet synchronous generator, a machine-side converter and a grid-side converter. Introducing an additional damping stability controller into a grid-side converter control system of the direct-driven wind turbine generator by using the constructed simulation model of the direct-driven wind turbine generator; aiming at a damping stability controller, optimizing a proportionality coefficient Kp, a lead constant T1 and a lag constant T2 by utilizing a particle swarm algorithm; and for the optimized damping stability controller, calculating a damping coefficient, and performing frequency sweeping in subsynchronous and super-synchronous frequency bands to obtain a curve of the damping coefficient in a response frequency band, and verifying the effectiveness of the suppression method. The subsynchronous oscillation suppression mechanism of the direct-driven wind turbine generator is clearly and quantitatively elaborated, and the problem of subsynchronous oscillation is effectively solved.

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 relates to an electromagnetic transient modeling and simulation method of a permanent magnet synchronous generator, which can reflect various types of internal faults, and the method comprises the following steps: 1, according to different fault types, establishing mathematical models of the permanent magnet synchronous generator in different fault states, and according to the different fault types, establishing a mathematical model of the permanent magnet synchronous generator in the different fault states, according to the different fault types, establishing a mathematical model of the permanent magnet synchronous generator in the different fault states, and according to the mathematical model, establishing a mathematical model of the permanent magnet synchronous generator in the different fault states, and according to the mathematical model, establishing a mathematical model of the permanent magnet synchronous generator in the different fault states, and establishing a mathematical model of the permanent magnet synchronous generator in the different fault states; 2, focusing matrix elements required to be updated according to fault characteristics, and selecting current or flux linkage as a state variable; 3, performing discretization equivalence on the mathematical equation of the permanent magnet synchronous generator by using a backward Euler integral method, integrating two state variables, unifying the model to obtain an equivalent circuit equation, and constructing an equivalent circuit of the permanent magnet synchronous generator; 4, the equivalent circuit of the permanent magnet synchronous generator is connected with an external electrical network, and the equivalent model carries out node admittance matrix iteration solution on the whole circuit based on an EMTDC solver; and updating other concerned electrical information such as the stator current, the rotor current, the electromagnetic torque, the rotating speed, the rotor angle and the like until the simulation is finished.

The present invention relates to a coordinated control method and system of a permanent magnet synchronous generator based on load mutation, and relates to the field of intelligent control technology, including: using sensors to continuously monitor the load condition of the permanent magnet synchronous generator, and collecting the load current, voltage and power factor in real time; comparing the load current, voltage and power factor with the preset safe operation threshold, and triggering an alarm if a mutation exceeding the threshold is detected; in response, activating a PID controller to switch it from a standby state to a working state; the PID controller calculates the adjustment amount through the operation of the three links of proportion, integration and differentiation according to the deviation between the collected real-time data and the set value; according to the adjustment amount, dynamically adjusting the excitation current of the permanent magnet synchronous generator, and adjusting the output power of the generator according to the real-time demand of the power system. The present invention can make an accurate response within milliseconds, and effectively improves the dynamic performance of the generator.

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 discloses a multi-vector model predictive control method for a dual three-phase permanent magnet synchronous generator considering a harmonic space, which comprises the following steps: selecting three voltage vectors to construct a target voltage vector in each control sector, substituting the target voltage vector into a discrete predictive control model to obtain a predictive current at the next moment, and further constructing a value function to obtain a predictive current at the next moment; and selecting an optimal virtual voltage vector set of the two subspaces and action time of the optimal virtual voltage vector through a minimum value function, combining control of the two subspaces into a control period, recalculating a switching sequence PWM signal, and acting on the rectifier. In the process of selecting the optimal virtual voltage vector set of the two subspaces, a superhelix integral sliding mode observer is used for observing current disturbance, and a composite controller is used for conducting zero static error tracking on harmonic waves in the z1z2 subspace. Under the condition that the dynamic performance is not affected, the fundamental wave space control performance is improved, the harmonic current is suppressed, and the steady-state performance of the DTP-PMSG is improved.

The invention provides an oscillating water column type wave energy power generation device and method, and relates to the technical field of new energy power generation. The characteristic that the permanent magnet synchronous generator can be converted between a power generation mode and a motor mode is utilized, the Wills turbine, the permanent magnet synchronous generator and the power storage device are combined, and the Wills turbine drives the permanent magnet synchronous generator to generate alternating current electric energy during power generation. The electrical storage device converts alternating-current electric energy generated by the permanent magnet synchronous generator into direct-current electric energy and stores the direct-current electric energy, the electrical storage device can supply power to the permanent magnet synchronous generator before power generation, the permanent magnet synchronous generator can drive the Wills turbine to rotate, and therefore the initial speed is provided for the Wills turbine; therefore, the starting process of the Wills turbine can be accelerated during subsequent power generation, the time consumed by the Wills turbine to reach the rated rotating speed after the Wills turbine is started is shortened, the Wills turbine can operate at the rated rotating speed for a longer time, and the working efficiency of the wave energy power generation device is improved.

The present invention discloses an emergency seamless switching system and method for a fully water-cooled permanent magnet synchronous diesel generator set, comprising a diesel generator set, an AC-DC bidirectional inverter main circuit, and a DC-DC bidirectional converter main circuit. The AC-DC bidirectional inverter main circuit is provided with three voltage lines L1, L2, L3 and a zero line N for providing a three-phase voltage to a load. The DC-DC bidirectional converter main circuit is connected to an energy storage battery pack. The permanent magnet synchronous generator outputs a DC bus voltage U through the AC-DC bidirectional inverter main circuit. C And three-phase voltage, DC bus voltage U C The energy storage battery pack is charged through the DC-DC bidirectional converter main circuit. When the load suddenly increases and the DC bus voltage U C When the voltage drops, the energy storage battery pack will boost the voltage through the DC-DC bidirectional converter main circuit to make the DC bus voltage U C Increases to maintain the DC bus voltage U C The present invention improves the adaptability of the diesel generator set under sudden load conditions, the emergency response capability under abnormal conditions and the stable power supply capability during the startup phase.

The embodiment of the invention discloses a deep well filling method and system with potential energy recovery and pressure regulation and control functions, and relates to the technical field of deep well filling pipeline conveying. The filling method comprises the steps that filling slurry of a filling station is conveyed to a goaf through a pipeline; the filling slurry drives the turbine to drive the permanent magnet synchronous generator to generate power, and the electric energy is stored in the hybrid energy storage assembly; collecting pressure and flow of an outlet of the hydraulic turbine in real time through a pressure sensor and a flow meter; according to a pressure value and a flow value collected by a pressure sensor and a flow meter in real time and an energy storage state of the hybrid energy storage assembly, the current adjustment amount of a turbine excitation module of the permanent magnet synchronous generator and the opening adjustment amount of an electro-hydraulic proportional valve are calculated; and adjusting the excitation current of a turbine excitation module of the permanent magnet synchronous generator based on the current adjustment amount, and adjusting the opening degree of the electro-hydraulic proportional valve based on the opening degree adjustment amount. The method is suitable for a deep well filling scene.

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.

The invention provides a diode high-voltage direct-current line offshore wind power transmission system, and belongs to the technical field of power transmission and distribution of power systems, and the system comprises a wind power generation module which comprises a direct-drive permanent magnet synchronous generator, a generator-side converter and a power grid-side converter; the high-voltage direct-current power transmission module comprises a rectifier and an inverter, the rectifier of the high-voltage direct-current power transmission module is a diode bridge, and the inverter is a modular multilevel converter; a generator side converter of the wind power generation module is used for stabilizing DC voltage, and a power grid side converter is used for controlling offshore AC voltage and frequency; the generator side converter adopts a double closed-loop vector control strategy; the power grid side converter adopts an internal control strategy; the inverter adopts a control strategy of an internal control loop and an external control loop. The wind power plant high-voltage direct-current power transmission system can realize maximum power point tracking.

A sliding mode control method for a permanent magnet synchronous fan based on an exponential control law belongs to the field of sliding mode control for fans and is used for speed loop control of a permanent magnet synchronous generator to achieve stable tracking of the optimal speed of the fan. The scheme constructs a terminal sliding mode function based on exponential convergence and designs a controller to effectively deal with the nonlinear characteristics of the system, and can have the characteristics of high-precision tracking of reference signals and suppression of jitter while converging quickly. By avoiding the differential processing of the exponential function in the equivalent control, the singularity problem of the conventional terminal sliding mode is avoided. The invention has the characteristics of simple structure, high control accuracy, fast convergence speed, small jitter and strong anti-interference ability.

The present invention provides a wave energy power generation hydraulic PTO constant speed and pressure control method based on dual parameter joint adjustment, the method comprising: collecting the system oil pressure signal p of the main oil circuit through a pressure transmitter, and sending the oil pressure signal p to the oil pressure closed loop regulation module; measuring the torque signal M of the input shaft of the three-phase permanent magnet synchronous generator through a speed torque meter; g and speed signal n, and the signal M g and n are sent to the oil pressure open-loop regulation module, and the signal n is sent to the oil pressure closed-loop regulation module; the electromagnetic torque of the three-phase permanent magnet synchronous generator is controlled by the three-phase PWM rectifier to indirectly adjust the speed n; the three-phase current signal i at the outlet of the three-phase permanent magnet synchronous generator is collected by the generator vector controller a i b i c , and output SVPWM signal to the three-phase PWM rectifier, while receiving the speed signal n and setting speed n r The present invention has good speed stabilization and pressure stabilization effects.

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 invention relates to the conversion of kinetic energy produced by the motion of the wheels into electrical energy that is capable of being used as a source for charging the battery, using permanent magnet synchronous generators (PMSGs) integrated at the wheels, in order to achieve high efficiency in the conversion of energy capable of charging the vehicle battery, with an FOC control system to regulate the torque and the speed of the permanent magnet synchronous motors and generators, and precise control of the generator power to store the generated energy, monitored in real time by a BMS storage system.

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.