205 results about "Tachometer" patented technology

The invention relates to the technical field of industrial automation control, and particularly discloses a rotating speed detection and closed-loop control system based on photoelectric sensing and a PLC, and the system comprises at least one rotating body which is a rotating speed controlled object, and the surface of the rotating body is provided with a configurable number of reflection mark areas or speed measurement holes; the proximity photoelectric switches are in one-to-one correspondence with the rotating bodies, are aligned with the reflection mark areas or the speed measurement holes, and are used for detecting rotation information of the rotating bodies and generating original pulse signals; a high-speed counter input port of the PLC is electrically connected with signal output ends of the proximity photoelectric switches, and a pulse preprocessing module, a rotating speed calculation module, a deviation processing module, a control algorithm module and a signal adaptation module are arranged in the PLC. The PLC and the proximity photoelectric switch which are widely applied in the industrial field and high in popularity rate are adopted as core technical components, and expensive special servo controllers, encoders and other devices are not needed, so that the hardware purchase cost of the system is greatly reduced.

The invention provides a vehicle drifting control method, device and equipment, a computer readable storage medium and a computer program product. The method comprises the steps that based on target state information and actual state information of a vehicle, a first slip rate component and a second slip rate component are obtained, the first slip rate component is used for slip angle stability control, and the second slip rate component is used for yaw velocity control; determining a left rear wheel slip rate target and a right rear wheel slip rate target based on a basic slip rate target, the first slip rate component and the second slip rate component; and rotating speed calculation is conducted based on the actual state information, the left rear wheel slip rate target and the right rear wheel slip rate target, and the vehicle is controlled based on the obtained left rear wheel rotating speed target and the obtained right rear wheel rotating speed target. According to the invention, a driver can maintain stable drifting of the vehicle only by operating the steering wheel and the accelerator.

The invention belongs to the technical field of mixing equipment, and particularly relates to a non-intrusive homogenizer operation process abnormity monitoring method and system, and the method comprises the steps: calculating the mechanical angular acceleration according to the real-time rotating speed of a motor shaft end; on the basis of a pre-constructed inverse dynamic model, according to the motor orthogonal axis current, the motor shaft end real-time rotating speed and the mechanical angular acceleration, a rheological resistance characteristic index is calculated; processing the rheological resistance characteristic index by using a singular spectrum analysis algorithm, and extracting a trend line of the rheological resistance characteristic index through construction of a trajectory matrix, singular value decomposition and diagonal averaging operation; the information entropy of the first-order difference sequence of the trend line is calculated to serve as the mixing stability entropy, and the mixing end point of the operation process of the homogenizer is judged according to the convergence condition of the mixing stability entropy relative to the reference entropy, so that anomaly monitoring of the operation process of the non-intrusive homogenizer is achieved. According to the invention, abnormity monitoring and end point determination of the mixing process of the homogenizer are realized.

The invention discloses a coal-fired power plant belt conveyor driving gear box bearing fault diagnosis method, which relates to the field of fault diagnosis and evaluation, and is used for extracting gear box bearing fault features based on an order tracking analysis method of tachometer-free instantaneous rotation frequency estimation. The method specifically comprises the following steps: S1, obtaining an instantaneous rotation frequency ridge line through the time frequency distribution of a vibration signal, carrying out the rotation frequency estimation of a rotating shaft, and improving the precision of the instantaneous rotation frequency ridge line through an improved multi-source ridge line fusion algorithm; and S2, extracting bearing fault feature order information by using a calculation order tracking COT algorithm, and adaptively processing a bearing fault diagnosis problem of the driving gearbox of the belt conveyor. According to the bearing fault diagnosis method for the rubber belt conveyor driving gearbox of the coal-fired power plant, the bearing inner ring fault is successfully diagnosed, and the feasibility of a bearing fault diagnosis strategy for the rubber belt conveyor driving gearbox is verified.

The invention provides a self-adaptive control method and system for an extrusion screw of a plastic extruder, and relates to the technical field of plastic recovery and regeneration, and the method comprises the following steps: collecting operation data of the plastic extruder; calculating a change trend and an effective value according to the machine head melt pressure; a three-level partition model is constructed, a pressure deviation value is calculated based on the effective value and the target reference value, and a pressure control area is generated according to a comparison result of the pressure deviation value and a pressure threshold value; performing consistency judgment on the change trend and the pressure demand direction to generate an adjustment coefficient, and performing step length correction by combining a pressure control region and a motor load current to generate a rotating speed adjustment amount; the to-be-executed rotating speed of the screw is calculated in combination with the real-time rotating speed of the screw, acceleration limiting processing is carried out to generate the target rotating speed of the screw, and the target rotating speed is coded into a control instruction to be sent to the driving unit, so that the self-adaptive control effect of the extrusion screw can be achieved, and false pressure fluctuation caused by material hardness change is effectively prevented; the extrusion stability and the response speed are obviously improved.

The invention relates to a rotary machine composite fault detection method and system under a time-varying working condition, and belongs to the technical field of rotary machine fault diagnosis. The method comprises the steps of collecting a non-stationary vibration signal under a variable speed working condition, fusing a third-order Renyi entropy and kinematics prior to construct an adaptive time-frequency enhancement model, and outputting weighted time-frequency distribution; global optimization is carried out through a priori constraint Viterbi algorithm, and an instantaneous frequency ridge line is extracted under the condition of no rotating speed sensor; performing angular domain resampling by taking the ridge line as a phase reference, and converting a non-stationary signal into an angular domain stationary signal; constructing an extended difference mode decomposition convex optimization model, and iteratively solving an optimal difference spectrum; and determining a frequency spectrum segmentation threshold value based on self-adaptive change point analysis, performing decoupling separation and time domain reconstruction on the optimal difference spectrum, and completing composite fault diagnosis through feature comparison. The method does not need an external tachometer, can adaptively extract and separate the composite fault features under the variable speed working condition, is high in diagnosis accuracy, and is good in engineering application value.

The invention relates to the technical field of fan control, and discloses a fan rotating speed adjusting method and system based on a dynamic pollution load. The method comprises the following steps: collecting a target PM2.5 concentration, a target VOC concentration and a target microorganism concentration of each monitoring point, and calculating a comprehensive pollution load index of each monitoring point; traversing boundary critical points in all the monitoring points based on the comprehensive pollution load index and generating a boundary identification vector; the real-time pressure drop of the air inlet side and the air outlet side of the filter element in each fan is collected, and the pressure difference compensation gain is calculated; calculating a target reference rotating speed for all monitoring points in the responsible sector of each fan; and calculating the average pollution load index of the responsible sector of each fan, executing fuzzy reasoning to obtain a rotating speed increment, and generating a PWM duty ratio according to the target reference rotating speed and the rotating speed increment to drive each fan. The technical problems of space pollution response lag and energy consumption imbalance are solved, and the performance of the air purification system is improved.

The invention relates to a fan field dynamic balancing device which comprises a motor, a coupler, a left bearing seat, a rotor shaft, an impeller, a right bearing seat, a swivel joint, a swivel joint oil inlet pipe, an oil tank, a left vibration sensor, a vibration analyzer, a right vibration sensor and a tachometer. The motor drives the rotor shaft and the impeller to rotate at a rated rotating speed through the coupler, the left bearing seat and the right bearing seat are provided with a left vibration sensor and a right vibration sensor respectively, the left bearing seat and the right bearing seat are used for fixing the rotor, and the vibration condition of the rotor is extracted through the vibration sensors installed on the bearing seats. Vibration signals extracted by the vibration sensor are transmitted to the vibration analyzer through a wire, the multi-oil-way swivel joint is additionally arranged at the free side shaft end of the fan, and by controlling opening of each oil way of the swivel joint, adding of counter weights of each impeller, namely different angles, is achieved.

The invention relates to the field of mower control systems, and discloses a gasoline mower cutter soft start control system which comprises an engine, a spark plug, a cutter and an electromagnetic clutch coil which are arranged in a mower shell. The input signal acquisition module, the level conversion and shaping circuit, the single chip microcomputer and the power driving execution module are electrically connected with the spark plug. The single chip microcomputer comprises a rotating speed calculation unit and a core control unit, the rotating speed calculation unit is used for calculating the rotating speed of an engine according to digital pulses output by the level conversion and shaping circuit, and the core control unit selects a soft start control parameter set according to the rotating speed of the engine and outputs a multi-stage PWM control signal to the power driving execution module; the working current of the electromagnetic clutch coil is adjusted by the power driving execution module in stages, soft starting of the cutting knife from a static state to a working rotating speed is achieved, and mechanical impact and vibration in the starting process are reduced.

The application discloses a power following compensation correction control method for a range extended electric vehicle, and steps are as follows: S1, power correction: initial demand power generation is calculated, and final power generation is obtained by correction according to current atmospheric pressure, SOC and load compensation; S2, speed correction: first correction power generation speed and power generation torque between maximum and minimum values are calculated, second correction power generation speed and simulation speed are calculated and accumulated, and final power generation speed is obtained together with preset maximum power generation speed; S3, torque correction: initial power generation torque is calculated according to final power generation and final power generation speed, feedforward correction torque is calculated according to feedforward compensation control, and finally, final power generation torque is obtained. The application also discloses a power following compensation correction control device and a computer system for the range extended electric vehicle. The application can ensure good driving following property under the premise of optimal fuel consumption and NVH performance, and can be widely applied in the field of the range extended electric vehicle.

The invention provides a motor control method and device of an air compressor, a vehicle and a storage medium, and the method is applied to the field of vehicles. The method comprises the steps that the current temperature of a motor is calculated based on the obtained direct-current voltage value of an air compressor controller at the target moment, the obtained water temperature value of a cooling water inlet of the air compressor controller, the obtained alternating current of the motor and the obtained rotating speed of the motor; and if the current temperature is greater than the allowable temperature of the motor, acquiring the current operation condition of the motor, and controlling the motor to operate in a power-reducing manner or stop operating according to a preset power-reducing strategy according to the current operation condition. According to the method, installation of a temperature sensor and lead-out wire harnesses and connectors is omitted, the temperature of the motor is calculated, a calculation result is transmitted to an FCU through a communication bus, and meanwhile a corresponding protection mechanism is executed according to a comparison result of the current temperature of the motor and the allowable temperature of the motor.

This invention relates to the field of textile machinery control technology, specifically to a control method for increasing the capacity of the sliver can in a carding machine coiler; S1. Set initial parameters; S2. Generate the tachometer of the chassis rotary motor; S3. Generate the pulse count table of the chassis traverse motor; S4. Position the initial position; S5. Perform one traverse: sequentially obtain the corresponding chassis rotary motor speed from the chassis rotary motor speed table, and control the sliver can to rotate approximately one revolution; simultaneously, sequentially obtain the corresponding chassis traverse motor pulse count from the chassis traverse motor pulse count table, and control the chassis traverse motor to run once; S6. After this traverse, repeat S5 until N-1 traverses are completed; S7. Execute S4 to enter the next cycle, until the carding machine stops. Using this method, the sliver can coil feed is increased, achieving a better capacity increase effect.

The invention belongs to the technical field of connectors, and provides a motor turn-to-turn short circuit fault diagnosis method, device and system, and the diagnosis method comprises the following steps: (1) collecting a current signal of a stator and the rotating speed of a rotor; (2) processing the current signal to filter out a fundamental frequency, and performing fast Fourier transform to obtain an actually measured frequency spectrum; (3) calculating a slip ratio according to the rotating speed, and determining a turn-to-turn short circuit fault characteristic frequency and a modulation frequency generated by load fluctuation; and (4) combining the actually measured frequency spectrum, the short-circuit fault characteristic frequency and the modulation frequency to diagnose the short-circuit fault state of the motor. According to the method, the load modulation frequency and the turn-to-turn short circuit fault characteristic frequency in a healthy state can be accurately separated, and the accuracy and reliability of asynchronous motor turn-to-turn short circuit fault diagnosis under the variable load condition are remarkably improved.

The utility model discloses a tachometer calibration clamping mechanism, which relates to the tachometer calibration clamping field, and comprises a calibration installation shell, a calibration driving assembly arranged in the calibration installation shell, a calibration clamping assembly arranged on one side of the calibration driving assembly, a clamping driving assembly arranged on one side of the calibration clamping assembly, and a calibration clamping assembly arranged on the other side of the calibration clamping assembly. According to the automobile tachometer calibrating device, the prior art is improved, in actual use, clamping force can be kept in a self-adaptive mode through the calibration clamping assembly, and the problems that in the using process of an existing automobile tachometer calibrating device, a tachometer is fixed at a time, automatic re-clamping cannot be achieved after clamping is loosened, and clamping force cannot be adjusted are solved. The problem that the tachometer is easy to shake in the calibration process due to the fact that the tachometer is damaged, the accuracy of the measurement result is affected, and the practicability of the device is reduced is solved.

The embodiment of the application relates to the technical field of intelligent control, and relates to a deviation correction control method and device of a tower crane frequency converter, a computing device and a storage medium. The method specifically scheme is: obtaining encoder data generated by a tower crane motor when the tower crane motor operates at a set frequency; calculating an actual motor speed according to the encoder data, and calculating a deviation coefficient according to the actual motor speed and a rated motor speed; and performing deviation correction control on the frequency of the frequency converter according to the deviation coefficient. The embodiment of the application can dynamically obtain physical parameters of the tower crane, calculate a deviation coefficient according to the physical parameters, correct the frequency deviation of the frequency converter by using the deviation coefficient, and thus precisely control the operation of the tower crane, and ensure the accuracy of automatic operation of the tower crane.

The embodiment of the invention discloses a fan rotating speed control method, device and equipment and a storage medium. Initial fan rotating speed, first environment parameters, experiment fitting parameters and fan real-time operation duration are obtained, and compensation fan rotating speed is calculated based on the first environment parameters, the initial fan rotating speed and the experiment fitting parameters; under the condition that the real-time operation duration of the draught fan is within the first preset duration stage, the rotating speed of the draught fan is adjusted to the compensation draught fan rotating speed from the initial draught fan rotating speed; and under the condition that the real-time operation duration of the fan is within a second preset duration stage, a second environment parameter is obtained in real time, the normal fan rotating speed is calculated based on the second environment parameter, the initial fan rotating speed and the compensation fan rotating speed, and the fan rotating speed is adjusted to the normal fan rotating speed from the compensation fan rotating speed. The second preset duration stage is after the first preset duration stage. The requirement of the unit for the high wind speed in the refrigeration mode can be fully met, and accurate matching of system energy efficiency is achieved.

The invention discloses a braking energy recovery control method for an electric vehicle. The method comprises the following specific steps: 1, acquiring an accelerator, a brake pedal, a parking signal, a vehicle speed signal and a battery load value; 2, starting a braking energy feedback mode; 3, the current vehicle speed value is obtained, and the braking torque is obtained; 4, the current state of the power battery is obtained, and the limit braking torque of the power battery is calculated; 5, the current rotating speed of the driving motor is obtained, and the limiting braking torque of the driving motor is calculated; 6, obtaining the maximum feedback torque limit value of the driving motor; 7, comparing the braking torque, the power battery limit value braking torque, the driving motor limit value braking torque and the driving motor maximum feedback torque limit value to obtain a minimum value Tmin; 8, acquiring a feedback torque value Trq of the drive-by-wire ACBS; step 9, comparing the minimum value Tmin and the torque value Trq, and taking the maximum value T as the final feedback torque; and tenthly, electron rotation is controlled to conduct energy recovery according to the final braking target torque.

The utility model discloses a train operation scene test platform based on an unmanned driving mode, and relates to the technical field of train data simulation. Comprising a temperature detection simulation module which is composed of an integrated circuit temperature sensor, a diode and a first addition arithmetic unit and is used for detecting the surface temperature of the train diesel engine through communication of the sensor and the diode; the train running speed simulation module comprises a tachometer conversion board and a second addition arithmetic unit, and the voltage signal output by the industrial personal computer is adapted to the display equipment through the conversion board to simulate the train running speed; the disturbance signal simulation module comprises a random number generator chip and an operational amplifier and is used for simulating interference signals in the train running process and inputting the interference signals to the temperature and speed module; and the monitoring display module is composed of a microcontroller and train data display equipment, receives and displays the analog data and provides monitoring of the running state of the train. The platform can accurately simulate key parameters in the operation process of the unmanned train.

The invention relates to a model-based fuel cell air compressor high-speed motor control rack and method. The control rack comprises an air compressor high-speed motor load control model, a high-power direct-current power supply, a three-phase two-level motor driver, a motor rapid prototype controller, an upper computer, a permanent magnet synchronous motor, an eddy current brake, a torque sensor and a signal acquisition and coding unit. The control rack constructs a load control model based on air compressor MAP data and a load torque optimization algorithm, calculates a target load torque corresponding to the highest adiabatic efficiency point according to any rotating speed, and controls the eddy current brake to perform accurate load simulation; meanwhile, a user-defined control algorithm is automatically compiled and deployed to a motor driver through a rapid prototype controller, the permanent magnet synchronous motor is driven to operate under a simulated load, and high-precision signal feedback is combined, so that safe, efficient and high-fidelity real-time closed-loop verification of the control algorithm is realized, and the research and development period is remarkably shortened.

The application discloses a kind of based on dynamic pulse discrimination steam turbine speed anti-interference measurement method, it is related to industrial automation control field, the method includes: S1: by the speed sensor of installation in steam turbine rotor speed measuring gear flank alternately changed and generated sine wave signal of tooth valley conversion into digital pulse signal by conditioning circuit;S2: calculate the effective pulse frequency f of this sampling time, to calculate effective pulse cut-off period T;S3: for subsequent new pulse, calculate the time interval Δt between it and the last pulse being judged as effective;If Δt≥T, then determine that the new pulse is effective pulse;If Δt < T, then determine that the new pulse is interference pulse and is rejected;S4: update effective pulse frequency f, calculate the real-time speed of steam turbine, calculate the real-time speed of steam turbine solves the defect that present art relies on hardware filtering and is difficult to eliminate singular interference pulse completely, leading to unreliable speed measurement.

This invention discloses a range extender control method, device, and electric vehicle. The method includes: obtaining a power limitation coefficient based on the current atmospheric pressure, determining the target power generation capacity using the power limitation coefficient, compensating for the initial target engine speed, and determining the final target engine speed; adjusting the engine speed from the current speed to the final target speed using a speed mode; calculating the engine's target torque, and using a torque mode to provide braking force to the engine's target torque, causing the engine to adjust to the target torque according to a torque loading slope, wherein the lower the engine speed and atmospheric pressure, the smaller the torque loading slope. This method is flexible and scientific, fully exploring and utilizing the engine's potential. In high-altitude areas, by increasing the engine speed to ensure actual power generation, even without actively reducing the drive motor's drive power, it can meet the demand for long driving range while maintaining strong power.

The application discloses a control method of an oil fume extractor, the oil fume extractor comprising a power device installed on a ceiling, the power device being installed with an external installation base through a suspension structure; the power device comprising a fan frame and a fan; the control method comprising the following steps: 1) turning on the oil fume extractor; 2) monitoring the rotating speed N of the motor of the fan; 3) calculating the rotating speed change AN within a certain time t; 4) entering step 5) when the motor reaches a steady state; 5) calculating the current motor rotating speed base frequency 6) corresponding to the resonance suspension height L(f0) of the power device; 7) judging whether L-L(f0)≤ΔL is established or not, if yes, entering step 8), if not, returning to step 3); 8) monitoring the vibration amplitude A of the current suspension structure and the fan frame connection, judging whether A≥A0 is established or not, if yes, entering step 9), if not, returning to step 3); 9) adjusting the suspension structure so that the power device moves a unit distance upwards from the current position.

Vehicle control apparatus includes: first / second shaft coupled with first / second drive wheel of vehicle; differential gear mechanism configured to distribute torque from motor to first / second shaft; sensor configured to detect first / second wheel rotation speed and motor rotation speed; and motor control unit including processor and memory. Motor control unit: calculates input rotation speed into differential gear mechanism based on motor rotation speed; calculates output rotation speed from differential gear mechanism based on first / second wheel rotation speed; calculates difference between input rotation speed and output rotation speed; determines whether duration of state in which difference exceeds predetermined value has exceeded determination time; and limits motor target torque to zero when it is determined that duration has exceeded determination time.

The application relates to the field of iron roughneck control, and discloses an iron roughneck clamping control method and device, an iron roughneck and a storage medium. The method comprises the following steps: acquiring the suspension displacement of a suspension oil cylinder and the rotation angle of a rotating motor in the iron roughneck, the suspension oil cylinder being used for controlling the suspension movement of a main clamp, and the rotating motor being used for controlling the rotation movement of the main clamp; calculating the rotating speed of the rotating motor through the rotation angle, and calculating the suspension speed of the main clamp when performing the suspension movement through the suspension displacement; calculating the theoretical pitch parameter of a drill rod according to the suspension speed and the rotating speed, and identifying whether the iron roughneck has rotation slip through the corresponding relationship between the actual pitch parameter and the theoretical pitch parameter of the drill rod; and when the iron roughneck has rotation slip, adjusting the pressure of a clamping oil cylinder in the iron roughneck, so that the clamping force of the main clamp and / or an auxiliary clamp of the iron roughneck is increased. The application improves the accuracy and timeliness of the identification of the slip phenomenon of the iron roughneck, and further improves the timeliness of the clamping force control.

The invention discloses a transmission system clearance crossing torque control system and method. The system comprises a transmission information obtaining module used for obtaining the driving end rotating speed, the load end rotating speed and transmission system characteristic parameters of a whole vehicle transmission system; the state identification module is used for calculating a transmission shaft rotation angle according to the driving end rotation speed and the load end rotation speed, and judging a gap crossing state of the current transmission system according to the transmission shaft rotation angle and a preset gap crossing angle threshold value; the torque calculation module is used for calculating friction torque, inertia torque and load torque of the transmission system according to the driving end rotating speed and the load end rotating speed of the transmission system and the characteristic parameters of the transmission system; the zero-crossing control module is used for obtaining zero-crossing torque according to the clearance crossing state of the transmission system, the friction torque, the inertia torque and the load torque, applying the zero-crossing torque to the driving end to serve as required torque, and adjusting the clearance crossing torque of the transmission system.

A nitrogen generating device comprises: a main heat exchanger; a nitrogen distillation column; at least one nitrogen condenser; a compressor; an expansion turbine; a rotation control unit for controlling rotation with respect to a rotating shaft connecting the compressor and the expansion turbine; a pressure measuring unit for measuring a pressure value of product nitrogen gas; and an optimum rotational speed calculation command unit which inputs the pressure value measured by the pressure measuring unit into a pre-installed rotational speed calculation function to calculate the rotational speed of the rotating shaft, and issues a command to the rotation control unit.

This invention discloses a trajectory tracking control method and system for autonomous vehicles based on four-wheel distributed drive, comprising: obtaining the current speed of the four-wheel distributed drive vehicle and the user's desired speed; simplifying the four-wheel distributed drive vehicle into an ideal two-degree-of-freedom bicycle model, wherein the model includes an ideal rear wheel and an ideal front wheel; determining the absolute position of the ideal rear wheel of the four-wheel distributed drive vehicle at the current moment, calculating the turning radius of the ideal two-degree-of-freedom bicycle model and the turning angle of the ideal front wheel, and obtaining the desired trajectory of the four-wheel distributed drive vehicle; calculating the basic rotational speed of each wheel of the four-wheel distributed drive vehicle; calculating the compensation speed of each wheel of the four-wheel distributed drive vehicle; and obtaining the total desired rotational speed of each wheel based on the basic speed and the compensation speed of each wheel. This invention achieves trajectory tracking control of a four-wheel distributed drive vehicle with strong real-time performance.

The utility model provides a photoelectric rotating speed sensor with a broken line detection circuit, which relates to the technical field of rail vehicle-mounted speed measurement and comprises a shell assembly, the shell assembly is composed of a shell and a coupler, the shell is arranged at the top of a mounting surface, and the coupler penetrating through the shell is arranged at the bottom of the mounting surface. The pressure transmitter test interface has the remarkable beneficial effects that in the aspect of fault advanced detection, the sensor wire breakage condition can be detected before a vehicle is started, potential safety hazards and operation problems caused by sensor faults in the vehicle operation process are killed in the bud state, the driving safety is ensured, and the maintenance efficiency is improved. Through clear high and low level indication, maintenance personnel can quickly position a fault channel, the maintenance time is greatly shortened, the operation efficiency of a railway vehicle is powerfully improved, and from the aspect of system reliability, the test interface can effectively guarantee normal transmission of sensor data, so that a railway vehicle operation control system is more stable and reliable.

The application provides a fan control method without measuring wind speed, comprising the following steps: monitoring the current rotating speed of the fan in real time, and once the rotating speed changes, it indicates that the current wind speed changes; then according to the current rotating speed and the initial rotating speed, the first capture power of the fan under the changed wind speed is calculated by using an additional power control formula; and then the output power of the fan is adjusted according to the calculated first capture power, so that the output power is equal to the current capture power of the fan, and the control of the fan is completed. This method does not depend on the measurement of wind speed, and only needs to calculate the first capture power of the fan under the current wind speed according to the current rotating speed of the fan and the initial rotating speed at the last moment; and then the output power of the fan is adjusted according to the first capture power. The wind speed does not need to be measured, so the error caused by the measurement is reduced, and therefore the control precision is higher than that of the existing adjustment method.

The application discloses a parameter setting method, device and system for a swing reactance of an excitation regulator, wherein the parameter setting method adds forced oscillation to a speed regulator link in a closed-loop simulation test environment, so as to stimulate equal-amplitude oscillation of mechanical power and unit frequency in a set frequency range; the error between a real signal value output by a real excitation device and a simulation signal value output by a simulation test model is calculated, the initial value of the swing reactance parameter is selected according to the error, the adaptability and effectiveness of the swing reactance are verified based on the initial value, the test result is obtained through a voltage step test under a set working condition, and the swing reactance parameter is modified according to the test result, so that the active power fluctuation when the PSS is put into operation meets the set condition. The parameter setting method provided by the application can reduce the risk of power oscillation accidents caused by large unit speed calculation error due to unreasonable swing reactance parameter setting and weak damping or even negative damping of the PSS.