3198 results about "Speed regulator" patented technology

The invention relates to a three-layer airborne flight control device for a micro four-rotor aerial vehicle, and belongs to the technical field of micro aerial vehicles. A navigation control layer consists of a navigation controller, an inertial measurement unit, a micro laser distance measuring sensor, a micro vision sensor and a wireless fidelity (WiFi) wireless network; an attitude control layer consists of an attitude controller, a gyroscope, an accelerometer, a magnetometer, a pressure sensor, an ultrasonic sensor, a remote controller and receiver unit and a ZigBee wireless communication unit; and a motor speed regulation control layer consists of four brushless motor speed regulators and four actuator units. The attitude controller is added, so that the whole flight device becomes intelligent, can perform autonomous navigation positioning, can avoid obstacles, is independent of manual operation of a remote controller, and becomes an intelligent robot in the real sense.

The invention discloses a permanent magnetic speed regulation, brake or load apparatus capable of stepless adjustment of magnetic field intensity. The apparatus is characterized in that the apparatus is a of single-rotating disk / multi-rotating disk type structure , a single-rotating cylinder / multi-rotating cylinder type structure, a rotating disk and rotating cylinder combination type structure or a rotating disk and rotating cylinder compound structure, and is mainly composed of a driving rotor, a driven rotor, a work magnetic coupling air gap / medium, a magnetic leakage magnetic circuit / air gap, a magnetic leakage magnetic circuit air gap adjusting disc and an adjusting mechanism. The apparatus provided by the invention is applied to such technical fields as coupling transmission, load speed regulation, automatic transmission, brake and braking, load rotation, power cut-off / combination, motor energy conservation, a household electrical appliance (including an air conditioner, an electric fan and a washing machine) and the like. The technical scheme is used for designing and manufacturing a permanent magnetic speed regulator, a speed regulation shaft coupling, an automatic transmission, a braking device, a load / loading device, a centrifugation load speed regulator or a clutch or a novel energy-saving household electrical appliance.

The present invention provides a speed governor (5) suitable for use in a fluid driven down-hole tool (3). The speed governor comprises an actuator (7) operatively coupled to a motive fluid flow control valve (6). The actuator is and arranged so as to be activatable, directly or indirectly, in response to the running speed of the tool (3), for opening of the control valve (6) with increasing rotational speed of the motor (3) above a predetermined speed limit thereby to limit the rotational speed of the downhole tool (3).

A heads-up speed sensing display and control system for apprising an operator of the risk of operating a vehicle at various speeds has a risk indicator display with a plurality of illuminable elements, such as three different colored LEDs, illuminable in a plurality of patterns, each of the plurality of patterns having a predetermined correlation to vehicle speed, such as green for safe, yellow for caution and red for hazardous. A speed sensor, such as a Hall-effect device is coupled to a driven element of the vehicle, like a speedometer cable, and causes the speed sensor to generate a signal indicative of vehicle speed. A control unit receives the speed signal and selects an illumination pattern to indicate the risk of operation at the speed the vehicle is then traveling. The display may be wired or wireless and be attached to a windshield, face guard or helmet. The display system may be customizable to the operator and the environmental conditions and may be coordinated with a signage system using the same risk indicator conventions. The indicator system may also be used as a governor. In yet another embodiment, GPS data is used in a lookup table to ascertain the speed limit for the operation of the vehicle at any given time and place. The speed limit information is used to inform a governor which reduces vehicle speed to the ascertained limit. The ascertained speed limit may be used to select a risk indicator pattern for the actual operating speed of the device.

The invention relates to the field of dimming and speed regulation related to illumination, motors and electronics, in particular to a motor-driven circuit for dimming or speed regulation control which is suitable for illumination of a silicon-controlled dimmer or adjustment of a silicon-controlled speed regulator and a control method. A detection compensation circuit for maintaining the normal work of the silicon-controlled dimmer consists of a voltage detection circuit, a current detection circuit, a follow current compensation circuit and a power factor compensation circuit; the on-off running state of the silicon-controlled dimmer or speed regulator is detected by a detection method combining output voltage change and current change of the silicon-controlled dimmer or speed regulator;the on-off and trigger running conditions of the silicon-controlled dimmer are provided by adopting a compensation method combining power factor compensation and follow current compensation; a control circuit of a load consists of a datum transformation circuit, an output duty cycle control circuit, an output current control circuit and a drive output circuit and produces a control signal by detecting mains supply AC phase-shedding operation output of the silicon-controlled dimmer or speed regulator; and the output power of the load is controlled by a load output duty cycle and load working current compound control method so as to realize large output power adjustable range of the load and high linearity of the adjusting process.

A gaseous carburetor or fuel control system includes a fuel metering assembly, a venturi mixer assembly, a throttle assembly, and an electronic control unit. The control unit controls the fuel metering assembly in a closed loop manner based on detected gas and air pressure to an air / fuel mixing venturi. An electronic governor which controls the throttle valve may also be controlled by the same control unit which controls the fuel metering assembly, using a separate control loop.

The invention provides an actual-measurement modeling method for a prime mover and a speed governor thereof of an electric power system, belonging to the technical field of electric power systems. The invention solves the problem that the traditional prime mover and the speed governor thereof generate larger bias of a simulated calculation result due to the use of a typical model and typical parameters. The actual-measurement modeling method for the prime mover and the speed governor thereof of the electric power system comprises the following steps of: (1) collecting data; (2) establishing mathematical models of the prime mover and the speed governor thereof; (3) carrying out model selection; (4) carrying out segmented field testing on the prime mover and the speed governor thereof; (5) carrying out segmented parameter recognization to obtain parameters of each segment; (6) screening data before the population parameters are recognized; (7) carrying out population parameter recognization; (8) carrying out model parameter verification; (9) carrying out frequency large-disturbance testing; and (10) carrying out model parameter verification. By means of the actual-measurement modeling method, the models and the parameters can be ensured to be accurately applied to BPA (Bonneviklle Power Administration), PSS / E (Power System Simulator / Engineering) electric power system analysis software, and the electric power system simulation precision is improved.

In one embodiment, a system for controlling drill motor rotational speed includes a downhole motor disposed in a drill string and having a rotor operable to be rotated by a flow of drilling fluid through the motor. The system also includes one or more by-pass ports operable to allow a portion of the drilling fluid to exit the drill string into a well bore and a governor coupled to the rotor and comprising a valve operable to move in response to the rotational speed of the rotor. The valve movement controls the amount of drilling fluid allowed to flow through the by-pass ports and exit the drill string into the well bore. The valve also directly controls the flow of the drilling fluid into the motor based on the amount of drilling fluid allowed to flow through the by-pass ports, thereby controlling the rotational speed of the rotor.

The invention provides a multi-rotor type unmanned aircraft system with a fire detecting function. Six engine arms and a frame form a body frame of the multi-rotor type unmanned aircraft system; a motor and an electronic speed regulator are connected with each other to control the rotation speed of propeller blades; a landing gear is used for an aircraft to stably land during landing; an unmanned aircraft flight control system is used for controlling stable postures of the aircraft; a sensor is connected with the unmanned aircraft flight control system; a small-sized control computer is connected with laser distance measuring sensors through communication; a processed signal is input into the unmanned aircraft flight control system to control three-dimensional positions and postures of the aircraft indoors; high-definition cameras are connected with an image transmitting device to collect video images of environment; and the image transmitting device is used for transmitting a video image signal to a ground station device so as to realize real-time observation. The multi-rotor type unmanned aircraft system with the fire detecting function, provided by the invention, is advantaged in that the multi-rotor type unmanned aircraft system can autonomously fly under a complicated environment, automatically detect fires in real time, automatically avoid obstacles and protect personal safety; remote monitoring and remote real-time communication are realized; data can be saved and replayed and so on.

Aiming at the defects in the prior art, the invention discloses a control method of a speed regulator of a servo system of a flat knitting machine. A system in the prior art has low adaptability and low stability. According to a fuzzy proportional-integral (PI) control algorithm of the control method, the running speed of a transmission mechanism of the computerized flat knitting machine is used as a control object; the difference value between the practical reference speed and the feedback speed and the change rate of the difference value are served as input of a fuzzy controller; the input quantity is fuzzified through selecting an appropriate universe of discourse and an appropriate membership function; appropriate fuzzy rule tables are set by utilizing the practical tuning strategies of PI parameters; and after a Mamdani fuzzy reasoning algorithm and defuzzification processing are adopted, the variable quantities of parameter values of the PI controller are output, thereby realizing on-line correction of the PI parameters. By adopting the control method, the disadvantages of a traditional manual correction method for the PI parameters are overcome, and on-line real time correction of the PI parameters is realized, thereby improving the adaptability and the stability of the system.

The invention relates to an orthophoto pan-tilt-zoom of an unmanned plane. A camera is controlled by a control device of the pan-tilt-zoom and is led to keep the optical axis thereof to be vertical with the ground in the flying process, thus improving mapping precision and greatly reducing flying operation time. The orthophoto pan-tilt-zoom of the unmanned plane is assembled at the bottom part of the unmanned plane; the camera is arranged on a base of the pan-tilt-zoom; the base is connected with an X-axis control group and a Y-axis control group of the pan-tilt-zoom; the X-axis control group and the Y-axis control group are respectively comprise a gyro, an electronic speed regulator and a server which are connected in sequence; and the gyro is connected with a remote-control receiver and a power supply in sequence; when the unmanned plane flies, the incidence angle of optical axis of the camera to the ground generates deviation, at the time, the gyro detects deviation rate of the camera and outputs corresponding signals to the electronic speed regulator; the electronic speed regulator controls the server to make corresponding rotation to output opposite moment so as to damp the generation and continuity of deviation of the camera and lead the camera to restore the state vertical to the ground naturally by the center of gravity of the camera.

A heads-up speed sensing display and control system for apprising an operator of the risk of operating a vehicle at various speeds has a risk indicator display with a plurality of illuminable elements, such as three different colored LEDs, illuminable in a plurality of patterns, each of the plurality of patterns having a predetermined correlation to vehicle speed, such as green for safe, yellow for caution and red for hazardous. A speed sensor, such as a Hall-effect device is coupled to a driven element of the vehicle, like a speedometer cable, and causes the speed sensor to generate a signal indicative of vehicle speed. A control unit receives the speed signal and selects an illumination pattern to indicate the risk of operation at the speed the vehicle is then traveling. The display may be wired or wireless and be attached to a windshield, face guard or helmet. The display system may be customizable to the operator and the environmental conditions and may be coordinated with a signage system using the same risk indicator conventions. The indicator system may also be used as a governor. In yet another embodiment, GPS data is used in a lookup table to ascertain the speed limit for the operation of the vehicle at any given time and place. The speed limit information is used to inform a governor which reduces vehicle speed to the ascertained limit. The ascertained speed limit may be used to select a risk indicator pattern for the actual operating speed of the device.

The invention discloses a permanent magnet synchronous motor sliding-mode control strategy based on a novel reaching law. The permanent magnet synchronous motor control strategy adopts speed and current double-closed-loop control, a current loop adopts a PI (proportional-integral) controller, and a rotating speed loop adopts sliding-mode control based on the novel reaching law; a speed regulator adopts a novel speed change reaching law containing speed errors and sliding-mode surface information, deviation of a set rotor angular speed and a feedback rotor angular speed is used as the input quantity, and a q-axis current set value iq<*> is output through the sliding-mode control quantity. With the adoption of the strategy, the problems that a traditional reaching law is slow and large in steady-state buffeting are solved, the set rotating speed can be tracked quickly in a dynamic state, speed overshoot and current fluctuation are reduced, the harmonic content, produced by high-frequency buffeting, of a system can be decreased in a steady state, the performance of the system is greatly improved, and high-precision vector control on the permanent magnet synchronous motor speed regulating system is realized.

The invention discloses a full-automatic indoor environment control, obstacle avoidance and navigation type micro aerial vehicle. The micro aerial vehicle comprises an aerial vehicle body, a full-automatic control system, a power device group and a power supply group, wherein the power device group comprises four independent power devices, and each power device comprises a brushless motor, a propeller and an electronic governor; an environment identification sensor group comprises a two-dimensional laser scanning range finder, a miniature ultrasonic range finder, a foresight camera and a downward-looking camera; and a control module comprises a miniature computer processor, a miniature three-shaft gyroscope, a miniature three-shaft accelerometer and a miniature three-shaft magnetometer. The full-automatic indoor environment control, obstacle avoidance and navigation type micro aerial vehicle disclosed by the invention has an indoor full-automatic flight control function of automatically identifying a window to enter the room, and automatically avoiding collision with an indoor wall or obstacle without need of external radio control or satellite receiver navigation.

A descender comprises a base plate (20) having a point of connection (24A) to a harness and a pivoting plate (22) mounted pivotally on the base plate (20) about an axis with the pivoting plate (22) having two spaced rotating pulleys (25 and 26) for engaging a rope (39). The base plate (20) has a rotating stationary pulley (27) mounted thereon to provide opposition to rotating pulleys (25 and 26) which are mounted on the pivoting plate (22). A control handle (23) with a cam surface (41) presses against the pivoting plate (22) which increases the space between rotating pulleys (25 and 26) on the pivoting plate (22) and the stationary pulley (27) that is secured to the base plate (20), thereby relieving the clamping effect. A speed regulator (34) stops the control handle (23) from full travel, allowing less than maximum rate of descent. A door plate (21) protects the internal parts when secured closed.

A speed controller for motor vehicles is provided, the vehicle having a distance regulating function, a locating system for detecting locating data for objects that are in front of the vehicle, and an evaluation device for determining whether a located object needs to be treated as a relevant target object in the vehicle's lane. The speed controller includes a monitoring module that is designed to detect, by reference to the locating data, a situation in which objects not detected by the locating system are within close range and, in this situation, issue a takeover prompt to the driver.

The invention discloses a digital electric-hydraulic synchronous control system, which comprises a hydraulic actuating mechanism, a digital synchronous control mechanism for performing synchronous control on the hydraulic actuating mechanism, an electric-hydraulic power source for providing power oil for the hydraulic actuating mechanism and the digital synchronous control mechanism, and an electric-hydraulic control system for controlling the power source and the synchronous control mechanism. The hydraulic actuating mechanism is a hydrocylinder; the electric-hydraulic power source comprises an oil storage tank, a double-acting hydraulic oil pump and a driving motor; the electric-hydraulic control system comprises a detector for detecting the oil pressure of the hydraulic oil pump and the rotating speed of the motor respectively and a variable frequency speed regulator and a controller for controlling the motor; and the digital synchronous control mechanism comprises a digital synchronization valve, a digital synchronization controller and a displacement transducer for detecting the displacement of an output shaft of the hydrocylinder. The digital electric-hydraulic synchronous control system has the advantages of simple structure, simple and convenient use and operation, good use effect, energy conservation and no oil leakage, and can achieve the aims of stepless speed regulation and high-precision synchronization according to operating characteristic requirements of different types of controlled objects.

The systems and processes of the present invention includes ESP variable speed drive controllers that function in conjunction with a safety logic solver, pressure sensors, and an emergency isolation valve to perform a functional test of the complete wellhead trunkline protection system without interruption of production.

The invention discloses a brake block appearance defect multi-station online detection device and method. A direct current motor and a speed regulator are connected with a conveying belt for operation; a support frame is arranged on a base; three stations are sequentially arranged on the conveying belt along the conveying direction; a backlight light source module, an annular light source module and a coaxial light source module are sequentially arranged at the positions of the three stations; an industrial camera module is arranged right above the three stations; pneumatic push rods are arranged on the side edge of the upper belt surface of the conveying belt at the positions of the three stations; a photoelectric switch is arranged on the top of each pneumatic push rod; each pneumatic push rod is connected with an air compressor through an electromagnetic valve; the other side edge of the upper belt surface of the conveying belt is provided with a defective product material collecting box. A complete brake block surface defect automatic detection flow line is formed; different kinds of defects on the surface of a brake block can be detected through the arrangement of different light sources; the real-time on-line detection is realized; the multi-station detection integration is realized; the equipment cost and the labor cost are reduced; the work efficiency is improved.

The invention provides an energy-saving control method for adjusting the number of water pumps in a synchronous variable-speed variable-flux heat supply system, relating to the field of controlling the variable-flux heat supply system and aiming at overcoming the defects that the existing method has high energy consumption, unreasonable adjustment and unchanged application. The method comprises the following steps of: firstly, initiating the controller; subsequently, calculating m-1 shifting points; finally, carrying out the shift of the number of the water pumps in running; with the change of the flux of the pipe network, emitting an instruction by a controller to the frequency conversion speed regulator of the water pump to carry out the shifting operation if the total flux value of the pipeline network at a certain time is equal to the flux value of the shifting point obtained by the calculation; if not, continuously carrying out connecting in parallel a plurality of pumps so as to run synchronously with a frequency-conversion and speed-regulation way. The method is applicable to the variable-flux heat supply system which adopts a plurality of circulation water pumps to run in parallel. The way takes the total energy consumption of the water pump as the target function, and ensures that the water pump can always runs at the working condition with the lowest energy consumption; therefore, when the way is adopted, the energy consumption can achieve the minimum, the realization method is simple and easy and the energy is saved by 10%-15% compared with the traditional way.

The invention discloses a control method of a maximum torque per ampere vector control system for a position sensor-free internal permanent magnet synchronous motor, and belongs to the field of motor control. The problems of complexity of a computing method and low accuracy of an obtained current set value in the conventional maximum torque per ampere control strategy are solved. The control system comprises a permanent magnet synchronous motor, an inverter, a space vector pulse width modulation unit, a three-phase-two-phase coordinate conversion unit, a static-rotational coordinate conversion unit, a Fourier analysis unit, a vector angle regulation unit, a rotating speed regulator, a maximum torque per ampere control unit, a first current regulator, a second current regulator, a rotational-static coordinate conversion unit and a rotor position and rotating speed observer. According to the control method, the magnitude of current amplitude is automatically regulated and compared on the basis of a current vector angle gamma, and an operating point with maximum torque per ampere is automatically searched. The system and the method are applied to maximum torque per ampere vector control over the motor.

The invention discloses a tension fuzzy PID (Proportion Integration Differentiation) control method for a recoiling machine. In the method, current ring-speed ring double closed-loop control is adopted, a speed regulator and a current regulator are arranged respectively in the feedback elements of a current ring and a speed ring, six fuzzy controllers are adopted for controlling the PID parameters of the current ring and the speed ring, two inputs and one output are adopted for each fuzzy controller, input quantities are deviation values E and deviation change rates Ec of set tension, and output quantities are P, I and D parameters of a current controller and a speed controller respectively; three corresponding fuzzy controllers are connected in series respectively in front of the current regulator and the speed regulator, a subordinating degree function is regulated continuously in the running process of the recoiling machine, automatic control over the tension of the recoiling machine is realized by controlling the rotating speed of a motor and armature current, and the tension of the recoiling machine is regulated automatically and is always kept constant; and as proved by simulink simulation, the method has the advantages of quick response, high regulating capability, high robustness and effective improvement on the control effect.

The invention relates to a permanent-magnet speed regulation, braking or loading apparatus with an adjustable coupled flux. The apparatus is characterized in that a driving plate is a permanent-magnet coupling plate and a driven plate or braking plate is a flux switch type permanent-magnet plate; or the flux switch type permanent-magnet plate is used as a driving plate and the permanent-magnet coupling plate is used as driven plate / braking plate. The permanent-magnet coupling plate and the flux switch type permanent-magnet plate are in an air gap and magnetic field coupling structure mode; the installing sequences of the permanent-magnet coupling plate and the flux switch type permanent-magnet plate can be interchanged; and both the permanent-magnet coupling plate and the flux switch type permanent-magnet plate can serve as the driving plate and driven plate respectively and the internal and external nesting positions of the two plates also can be interchanged. The provided apparatus can be applied to technical fields like coupling transmission and load speed regulation, an automatic transmission unit, braking, rotary loading, power cutting off / combination, electromotor energy saving, household appliances, a sealed pump, petrochemical engineering, and wind power generation and the like; and the technical scheme employed by the apparatus can be used for designing and manufacturing a permanent-magnet speed controller, a speed-regulation coupler, an automatic transmission unit, a brake device, a loading / unloading device, a centrifugal load speed regulator or clutch, or a novel energy-saving household appliance.

The invention discloses a primary frequency modulation electric quantity compensation refined control method and apparatus under a giant hydroelectric generating set power mode. The control method comprises the steps of obtaining a frequency difference signal between a power grid standard frequency and an actual power grid frequency obtained in real time; judging whether the frequency difference signal is outside a primary frequency modulation frequency dead zone or not, if the frequency difference signal exceeds the primary frequency modulation frequency dead zone, delaying for 0.1second and then outputting a primary frequency modulation action signal; using the frequency difference signal, and enabling a giant hydroelectric generating set speed regulator to be in a power mode; if the actual power grid frequency obtained in real time exceeds the primary frequency modulation frequency dead zone and is within in a range of a superposition value between the primary frequency modulation frequency dead zone and power dead zone equivalent power, performing superposition between a frequency compensation coefficient and the corresponding function of a frequency modulation load according to the frequency difference signal to obtain corresponding theoretical frequency modulation power; obtaining corresponding theoretical regulation power according to the frequency difference signal and the corresponding function of the frequency modulation load; and forming a PID closed loop by a new active given value and the actual power value of the giant hydroelectric generating set, and outputting a corresponding frequency modulation load instruction. By virtue of the primary frequency modulation electric quantity compensation refined control method and apparatus, the primary frequency modulation contribution rate of the giant hydroelectric generating set can be accurately controlled, the primary frequency modulation percent of pass is improved, and the electric energy quality can be improved.

The invention discloses a permanent magnet speed controller, which comprises a cylindrical conductor rotor, a cylindrical permanent magnet rotor and a controller, and is characterized in that: the cylindrical permanent magnet rotor is arranged in the cylindrical conductor rotor; the cylindrical permanent magnet rotor and the cylindrical conductor rotor are separated by an air gap therebetween, and rotate independently along respective rotating shafts; and the controller controls relative positions of the cylindrical conductor rotor and the cylindrical permanent magnet rotor so as to change the action area between the cylindrical permanent magnet rotor and the cylindrical conductor rotor and change the transmission torque between the cylindrical permanent magnet rotor and the cylindrical conductor rotor. Permanent magnets of the permanent magnet speed controller are arranged on an outer ring of the cylindrical permanent magnet rotor, and output power and torque higher than those of a common permanent magnet speed controller can be obtained; the moving direction of the cylindrical permanent magnet rotor on the shaft thereof is vertical to that of the magnetic force of the permanent magnets, and the controller for controlling the movement of the cylindrical permanent magnet rotor only needs small driving force; and axial additional loads are not generated nearly in the adjustment, and the permanent magnet speed controller can be well applied to transmission systems with large axial running number.

The invention provides an electric transmission control method of tilting of a rotating furnace, comprising the following steps that: 1) a network is configured, and then a control system is operated; 2) a PLC controller sends a torque instruction value to frequency converters which then adjust motors corresponding thereto according to the instruction; 3) a tilting speed encoder detects actual speed values of all the motors and feedbacks the actual speed values to the frequency converters; 4) the frequency converters send the actual rotating speed and the torque values of all the motors by the network to the PLC controller, and the PLC controller judges that all the frequency converters are in normal state according to data; and 5) the PLC controller obtains a speed feedback value of the current system after analysis and operation, and then the PLC controller sends the torque instrument value to four frequency converters after calculation of a speed regulator of the PLC controller. The electric transmission control method leads transmission equipment to be in good working state, thus being capable of prolonging the service life of machines.

There is provided a regulator pin structure that is not only easily assembled but also capable of holding a hairspring in a gap without a risk of the hairspring being released, a regulator with the regulator pin structure, a structure of balance with hairspring, and a mechanical timepiece. A regulator pin structure of a regulator that is a component of a structure of balance with hairspring of a mechanical timepiece includes a pin-like body, a base that is situated on one end of the body and mounted to a body of regulator such that the position of the base is adjustable around the pivotal center axis E of the body, and a pair of two-pronged legs that extend from the other end of the body. The regulator pin structure is configured such that part of the outer end of a hairspring that is situated beyond a reformed portion of the hairspring along the outer circumference direction is freely fitted in a gap between the legs. Canopy-like projections are formed on at least one side edge of the front portion of at least one of the pair of legs in such a manner that the canopy-like projections laterally project along sides of the legs that face toward the gap. Regulator pin structure and regulator with the same, structure of balance with hairspring, and mechanical timepiece

The invention discloses a weak magnetic control method for a permanent magnet synchronous motor. The method comprises the following steps that: direct axis current instructions are obtained through a motor rotating speed regulator; and instruction values of motor alternating axis voltage are obtained by calculation through the direct axis voltage instruction value output by a motor direct axis current regulator and the maximum voltage value output by an inverter, and the motor voltage is guaranteed to reach the maximum value at the weak magnetic interval. The method provided by the invention can be used for solving the problem of nonideal system control effect caused by alternating and direct axis current coupling in weak magnetic control, and in addition, the voltage utilization rate can be improved.

The invention discloses a water turbine speed regulator PID parameter optimizing method and system. The method comprises the steps that the speed regulator PID parameter optimizing overall objective function J restraining ultra-low frequency oscillation is obtained, optimization is conducted through the optimization algorithm, the optimal PID parameter is sought, and the overall objective function is minimal. According to the method, the value obtained after weighting of the frequency step response deviation absolute value integral and speed regulating system damping at the focused ultra-low frequency band integral serves as the optimization objective, the obtained speed regulator parameter integrates the speed regulator adjusting performance and damping level at the same time, accordingly, the problem of ultra-low frequency oscillation caused by speed regulator negative damping is solved, and the speed regulator adjusting dynamic quality is combined.