37results about How to "Eliminate static difference" patented technology

The invention discloses a controlling method for predicting direct power of a three-phase voltage source type PWM converter. The dead-beat controlling concept in predictive control is introduced into the direct power controlling strategy of the three-phase voltage source type PWM converter, two controllers, namely a voltage controlling ring and a dead-beat power controlling ring, finish power decoupling control and direct current voltage stabilizing control together, and a phase-locked loop is not needed. In addition, the space vector modulation manner is used so as to achieve switching frequency constancy controlled by direct power, and therefore an output filter is easy to design and engineering is easy to achieve. The controller is simple in design and good in performance of controlling and has the advantages of being fast in response speed, high in controlling precision and good in robustness.

The invention provides a virtual synchronous generator-based shore power source system stability control method comprising an active power-frequency control part and a reactive power-voltage control part, virtual inertia control consists of virtual machinery rotational inertia J[omega]0s and machinery damping D[omega]0, a control equation for active power-frequency control P-f is indicated in the description, and a stability control equation for reactive power-voltage control Q-U is indicated in the description. Via the method, a problem of steady state deviation of system frequency in a current VSG technology-based shore power source can be overcome, static difference of system frequency can be eliminated, violent fluctuation of system voltage caused by reactive power rush of ship loads can be effectively checked because a link of reactive power inertia control and virtual excitation control is added in a traditional reactive power-voltage control strategy, and static difference of the system voltage can be eliminated. Via the control strategy disclosed in the invention, automatic power distribution can be realized during parallel operation of high capacity multi-module shore power sources.

The invention relates to an electro-hydraulic position servo system capable of quickly inhibiting impact loads and a control method of the electro-hydraulic position servo system. The invention mainly solves the technical difficulty that the existing electro-hydraulic position servo system is poor in high-intensity impact load interference inhibition and complex in system structure. The electro-hydraulic position servo system capable of quickly inhibiting the impact loads comprises a hydraulic source, an adder-subtracter, a controller, an electro-hydraulic servo valve, a hydraulic cylinder, aload, a displacement sensor, an analog-to-digital converter and a power amplifier, and also comprises two pressure sensors, an impact resistance compensator and a second analog-to-digital converter, wherein the two pressure sensors are arranged in oil passages of a high-pressure chamber and a low-pressure chamber of the hydraulic cylinder; output ends of the pressure sensors are connected with input ends of the analog-to-digital converters; output ends of the analog-to-digital converters are connected with an input end of the impact resistance compensator; a signal output end of the impact resistance compensator is connected with an input end of the adder-subtracter; and a signal output end of the adder-subtracter is connected with signal input ends of the analog-to-digital converters.

The invention discloses a double closed-loop control method and system based on traditional VSR current closed-loop control, belonging to the field of power electronics and its control technology; thesteps of the present invention are as follows: 1. The DC bus voltage of the rectification side is an outer ring, and the PI is passed through the PI. Adjusting to obtain the given value of the outputactive power; 2. Obtaining the given set value and the reactive power set value through the current command calculation module to obtain the active current command value and the reactive current command value; 3. The obtained active current The command value and the reactive current command value are adjusted by the current loop to obtain two values; 4. The two values are converted into a two-phase [alpha][beta] stationary coordinate system by synchronous coordinate transformation, and two other values are obtained; 5. Through SVPWM Generate six PWM signals to control VSR operation. The invention adds a new method for calculating the current command, thereby overcoming the problem that the dynamic response of the vector control strategy of the traditional VSR current closed loop is slow,the total harmonic distortion rate of the grid current is large, and the anti-interference performance to disturbance such as load variation is poor.

The invention discloses a hydraulic control system for a constant pressure press for a timber floor. The hydraulic control system for the constant pressure press for the timber floor comprises a mechanical mechanism and a hydraulic mechanism; a proportional control amplifier (16) of the hydraulic mechanism comprises an input interface unit (18) connected with a pressure sensor (17); the input interface unit (18) is connected with a signal processing unit (19) connected with a power amplifying unit (20); the power amplifying unit (20) is connected with a proportional speed regulation valve (15) provided with a displacement sensor (21); the displacement sensor (21) is connected with a signal conditioning circuit (22); the signal conditioning circuit (22) is connected with the signal processing unit (19). Multiple timber floor manufacturing procedures are integrated, so the manufacturing process is greatly simplified, the production efficiency is improved and manpower is saved; the hydraulic control system can be industrially produced, so the product consistency can be ensured.

The invention discloses a multi-DC motor forward series control system and method, wherein 2*(n+1) IGBT modules are connected in series in pairs to form n+1 bridge arms; the n+1 bridge arms are connected in parallel with positive and negative poles of a DC power supply, and n DC motors which are serially connected in a forward manner are respectively connected in series with the n+1 bridge arms; the n DC motors are connected to a reference voltage synthesizer through two-stage PI controllers via a speed sensor, a current sensor and a speed adjustment module in sequence, and the reference voltage synthesizer is connected to n+1 phase inverters by a PWM pulse generating unit; the n+1 phase inverters are connected to the reference voltage synthesizer via current regulating modules and one-stage PI controllers, and are connected to the PWM pulse generating unit through the reference voltage synthesizer; and pulse control signals generated by the PWM pulse generating unit control the on / offof the 2*(n+1) IGBT modules to drive the n DC motors. The number of circuit elements is small, the structure is simple, the performance stability is reliable, and the wide use value is achieved.

The invention relates to a static-error-free high-precision instrument temperature control circuit. The temperature control circuit comprises a bridge circuit, a proportion integration differentiation (PID) operational circuit, a self-excited oscillation circuit, a comparison circuit, an isolation circuit, a heating unit and a monitoring circuit which are connected in turn. The technical problem that a digital PID controller cannot meet the requirement in the high-reliability fields of aerospace and the like is solved, analog PID control is adopted, a static error can be eliminated, and the controlled temperature of an instrument is basically not changed along with the change of ambient temperature.

A vehicle power matching system with a hydraulic mechanical continuously-variable transmission can automatically adjust the transmission ratio of the transmission according to driving intentions of drivers and changes of an external load so that a driving system can provide enough power when in a transient state; during the transient state, an engine works at an optimal economical curve, and accordingly the system performance can be optimal. The vehicle power matching system has the advantages that the engine always works under the working conditions of optimal power performance and optimal economy; infinitely variable speeds are achieved rapidly and stably under the conditions of the driving intentions of the drivers and the changes of the external load; during the process, vibration noise is small, the overshoot is small, and offset is eliminated as far as possible; and the vehicle power matching system can meet the transient state power performance requirements and steady state economy requirements when a vehicle runs.

The invention discloses a double salient generator voltage adjustment control device and method having anti-interference capability. The method is characterized by, establishing a third-order linear state observer through detecting the output voltage of a generator and establishing switch tube control rata of a voltage regulator by utilizing output voltage reference values and linear state observer parameters, thereby realizing prediction correction of the output of the generator, improving dynamic response of the generator, reducing static difference, realizing auto-disturbance rejection function and overcoming the defects in the conventional control technology. The realization of the control method needs the combination of related hardware circuits. The required hardware circuits are simple in structure; the control method finishes related algorithms mainly by depending on a microprocessor; the overall used devices in the scheme are few; the production cost is low; and the device and method have extremely-high disturbance rejection performance and output voltage static difference.

The embodiment of the invention provides an ATO train control method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining the current speed, current position, current load and current command speed of a target train; according to the current speed, the current position, the current load, the current command speed and the slope information of the lineof the target train, obtaining the speed and load control quantity, the slope equivalent control quantity and the dynamic resistance control quantity; according to the speed and load control quantity, the slope equivalent control quantity and the dynamic resistance control quantity, obtaining the total control quantity, and outputting the level corresponding to the total control quantity. According to the ATO train control method and device, the electronic equipment and the storage medium provided by the embodiment of the invention, the speed and load control quantity, the slope equivalent control quantity and the dynamic resistance control quantity are fused to output the level, so that the fitting degree between the train and the command speed in the running process is better, the control deviation can be reduced, more accurate running control can be carried out, and the average traveling speed can be increased.

The invention provides a compensation method and device for the rotor position of a permanent magnet synchronous generator. The compensation method comprises the steps of dividing the rated power of the generator into N segments to obtain N power interval sections; for each power interval section, when the difference between the output active power of the generator and an active power set value ofthe generator in the corresponding power interval section is less than a first preset threshold, estimating the rotor position of the power interval section; applying offset to the estimated rotor position of each power interval section, and correspondingly obtaining an active power value of each power interval section after the rotor position with the applied offset is obtained, wherein the active power value includes a converter network side port active power output value or a generator active power output value; determining the optimal rotor position offset of each power interval section according to each active power value in the power interval section; and compensating the estimated rotor position of the power interval section according to the optimal rotor position offset.

The invention discloses a control system and method with three direct-current motors in forward-direction serial connection. The system is characterized in that eight IGBT modules form four bridge arms in a two-two serial connection manner, the four bridge arms are parallelly connected to the positive electrode and the negative electrode of a direct-current power supply, the three direct-current motors in forward-direction serial connection are serially connected with the four bridge arms, the three direct-current motors are connected with a reference voltage synthesizer sequentially through aspeed sensor, a current sensor, a speed adjusting module and a secondary PI controller, the reference voltage synthesizer is connected with a four-phase inverter through a PWM pulse generating unit,the four-phase inverter is connected with the reference voltage synthesizer through a current adjusting module and a primary PI controller, the four-phase inverter is connected to the PWM pulse generating unit through the reference voltage synthesizer, and pulse control signals generated by the PWM pulse generating unit controls the on and off of the eight IGBT modules to drive the three direct-current motors to operate. The control system is few in used circuit components, simple in structure, stable and reliable in performance and worthy of popularization and application.

The invention discloses a vertical pulverizer for grinding ultrafine powder. The vertical pulverizer for grinding ultrafine powder comprises a mechanical mechanism and a hydraulic mechanism, wherein a proportional valve control amplifier (16) of the hydraulic mechanism comprises an input interface unit (18) connected with an electric controller (17); the input interface unit (18) is connected with a signal processing unit (19); the signal processing unit (19) is connected with a power amplifying unit (20) connected with a proportional speed regulating valve (15); the proportional speed regulating valve (15) is provided with a displacement sensor (21) connected with a signal conditioning circuit (22); the signal conditioning circuit (22) is connected with the signal processing unit (19). The vertical pulverizer for grinding ultrafine powder, which is provided by the invention, can effectively prevent equipment failure caused by motor overloading; meanwhile, the hydraulic mechanism provided by the invention has superior stability and reliability, and the powder fineness and consistency after grinding are very ideal.

The invention discloses a permanent magnet motor variable scanning control system based on automatic disturbance rejection control. The control system adopts a speed-current q-d two-axis closed-loop control structure which comprises an active disturbance rejection control module, a first current controller, a second current controller, a first PARK inverse conversion module, a second PARK inverseconversion module, a CLARK conversion module, a space vector pulse width modulator (SVPWM), a three-phase inverter, and a speed and angle calculation module. The active disturbance rejection control module, the first current controller, the first PARK inverse conversion module, the space vector pulse width modulator (SVPWM) and the three-phase inverter form a connection link, and the first PARK inverse conversion module is also connected with the second current controller and the second PARK inverse conversion module. The second PARK inverse transform module is also connected with the CLARK transform module. In the variable speed scanning control system of the permanent magnet motor of the present invention, the system performance superior to the PID control is obtained, and the performance advantage of the automatic disturbance rejection control strategy in the variable speed scanning control under the complex environment is proved.

The invention belongs to the technical field of submarine falling depth retrieval control, and particularly relates to a method for retrieving falling depth of an X-rudder submarine. The method comprises the following steps: establishing a moving coordinate system by taking the center of gravity of the submarine as an original point, constructing a six-degree-of-freedom spatial motion equation ofthe cross rudder submarine, constructing an X rudder control force equation, and constructing a six-degree-of-freedom spatial motion equation of the X rudder submarine; iteratively solving a six-degree-of-freedom spatial motion equation of the X-rudder submarine by utilizing a four-order Runge-Kutta method; constructing a head rudder fuzzy controller and an X rudder fuzzy controller, determining acorresponding rule of X rudder manipulation, and constructing a steering fuzzy rule. The deepened depth retrieval efficiency of density mutation 0.5% is obviously improved; meanwhile, in combinationwith the scheme of longitudinal inclination auxiliary retrieval, the beneficial effect of the hull posture on depth drop retrieval is effectively utilized, the severe depth drop with the density abrupt change of 1% can be successfully retrieved, the pressure of the first rudder is relieved through longitudinal inclination auxiliary, the first rudder has the capability of continuing to operate, andthe retrieval success rate is effectively guaranteed.

The invention discloses a motor-driven horizontal oriented drill rig. A rail (7) is arranged at the side surface of a base (5); a moving slider (8) matched with the rail (7) is arranged above the base (5); a moving motor (9) is arranged above the moving slider (8); a rack (10) parallel with the base is arranged above the base (5); the moving motor (9) is meshed with the rack (10) by a gear; a drill rod motor (11) is arranged above the moving slider (8); a drilling rod (12) is fixed at the output end of the drill rod motor (11) connected with a current transformer (13); the current transformer (13) is connected with an amplifier (14) connected with a motor controller (15); the motor controller (15) is connected with the moving motor (9). According to the motor-driven horizontal oriented drill rig, the equipment fault caused by overloading of the drill rod motor can be effectively prevented and the ground drilling efficiency can also be improved.

The invention discloses a PI controller design method capable of preventing integral saturation during aero-engine control strategy switching, and relates to PI controller design of multiple control strategies of high-pressure rotating speed closed loop control, exhaust temperature closed loop limit, low-pressure rotating speed closed loop limiting, gas compressor outlet pressure closed loop limiting, acceleration closed loop limiting, deceleration closed loop limiting and the like and switching of all the control strategies. All closed loop controllers adopt a manner that a deviation is multiplied by a proportional action coefficient, then added with a fuel oil flow given value at the previous time and multiplied by a first-order inertia link transfer function, the fuel oil flow given values of all the control strategies at the current moment begin to be calculated from the fuel oil flow given values selected from the previous moments, large deviations of the non-selected control strategies cannot be accumulated, integral saturation cannot appear, however, substantially, it is still a PI controller, an integration element is included, and similarly, the offset can be removed.

The invention discloses a hydraulic control system for a constant pressure press for a timber floor. The hydraulic control system for the constant pressure press for the timber floor comprises a mechanical mechanism and a hydraulic mechanism; a proportional control amplifier (16) of the hydraulic mechanism comprises an input interface unit (18) connected with a pressure sensor (17); the input interface unit (18) is connected with a signal processing unit (19) connected with a power amplifying unit (20); the power amplifying unit (20) is connected with a proportional speed regulation valve (15) provided with a displacement sensor (21); the displacement sensor (21) is connected with a signal conditioning circuit (22); the signal conditioning circuit (22) is connected with the signal processing unit (19). Multiple timber floor manufacturing procedures are integrated, so the manufacturing process is greatly simplified, the production efficiency is improved and manpower is saved; the hydraulic control system can be industrially produced, so the product consistency can be ensured.

Disclosed is a high-precision phase locking method for an intelligent integrated low-pressure reactive power module, the method comprising a multiplicative phase discrimination link (1), a variable frequency period integration link (2), a variable parameter integration separation speed change PI regulation link (3), an angular frequency integration link (4), a frequency estimation link (5), remainder (6), sine (7) and cosine (8). An improved PI regulator uses a variable parameter integration separation speed change PI regulator for regulation, so that the phase locking precision is improved and the static deviation is eliminated under the premise that the rapidity of phase locking can be ensured. An improved loop filter can eliminate the influence of harmonic wave and frequency changes on the output precision of a phase-locked loop when in a steady state.

The invention provides a hybrid excitation generator control circuit, and relates to the field of motor control. The hybrid excitation generator control circuit comprises a three-phase full-bridge rectifier circuit, a sampling circuit, a comparison switching circuit and a bride-type four-quadrant power amplifying circuit, wherein a three-phase AC output by a hybrid excitation generator is rectified into a DC busbar current through the three-phase full-bridge rectifier circuit to output to the sampling circuit; the DC busbar current is sampled by the sampling circuit, generates a pulse level through the comparison switching circuit, and forms a pulse excitation current through the bride-type four-quadrant power amplifying circuit; the pulse excitation current is added to an exciting winding of the hybrid excitation generator; the bride-type four-quadrant power amplifying circuit can generate a bidirectional excitation current; when a DC busbar voltage is greater than a given value, demagnetization is carried out; when the DC busbar voltage is smaller than the given value, the magnetism is increased; and the DC busbar voltage is finally stabilized as the given value.

The invention provides a hybrid excitation generator control circuit, and relates to the field of motor control. The hybrid excitation generator control circuit comprises a three-phase full-bridge rectifier circuit, a sampling circuit, a comparison switching circuit and a bride-type four-quadrant power amplifying circuit, wherein a three-phase AC output by a hybrid excitation generator is rectified into a DC busbar current through the three-phase full-bridge rectifier circuit to output to the sampling circuit; the DC busbar current is sampled by the sampling circuit, generates a pulse level through the comparison switching circuit, and forms a pulse excitation current through the bride-type four-quadrant power amplifying circuit; the pulse excitation current is added to an exciting winding of the hybrid excitation generator; the bride-type four-quadrant power amplifying circuit can generate a bidirectional excitation current; when a DC busbar voltage is greater than a given value, demagnetization is carried out; when the DC busbar voltage is smaller than the given value, the magnetism is increased; and the DC busbar voltage is finally stabilized as the given value.

The invention discloses a PI controller design method for preventing integral saturation in aero-engine control strategy switching, and relates to closed-loop control of high-pressure rotational speed, closed-loop limitation of exhaust temperature, closed-loop limitation of low-pressure rotational speed, closed-loop limitation of compressor outlet pressure, and closed-loop limitation of acceleration The PI controller design of multiple control strategies such as deceleration closed-loop limit and the switching of each control strategy, each closed-loop controller adopts the deviation multiplied by the proportional action coefficient plus the fuel flow given value at the previous moment multiplied by the first-order inertial link In the form of transfer function, the given value of fuel flow of all control strategies at the current moment is calculated from the given value of fuel flow selected at the previous moment, and the large deviation of the unselected control strategy will not be accumulated, and integral saturation will not occur , but it is still a PI controller in essence, including an integral link, which can also eliminate static error.

The invention discloses a double closed-loop control method and system based on traditional VSR current closed-loop control, belonging to the field of power electronics and its control technology; thesteps of the present invention are as follows: 1. The DC bus voltage of the rectification side is an outer ring, and the PI is passed through the PI. Adjusting to obtain the given value of the outputactive power; 2. Obtaining the given set value and the reactive power set value through the current command calculation module to obtain the active current command value and the reactive current command value; 3. The obtained active current The command value and the reactive current command value are adjusted by the current loop to obtain two values; 4. The two values are converted into a two-phase [alpha][beta] stationary coordinate system by synchronous coordinate transformation, and two other values are obtained; 5. Through SVPWM Generate six PWM signals to control VSR operation. The invention adds a new method for calculating the current command, thereby overcoming the problem that the dynamic response of the vector control strategy of the traditional VSR current closed loop is slow,the total harmonic distortion rate of the grid current is large, and the anti-interference performance to disturbance such as load variation is poor.

The invention discloses a control system and method with three direct-current motors in forward-direction serial connection. The system is characterized in that eight IGBT modules form four bridge arms in a two-two serial connection manner, the four bridge arms are parallelly connected to the positive electrode and the negative electrode of a direct-current power supply, the three direct-current motors in forward-direction serial connection are serially connected with the four bridge arms, the three direct-current motors are connected with a reference voltage synthesizer sequentially through aspeed sensor, a current sensor, a speed adjusting module and a secondary PI controller, the reference voltage synthesizer is connected with a four-phase inverter through a PWM pulse generating unit,the four-phase inverter is connected with the reference voltage synthesizer through a current adjusting module and a primary PI controller, the four-phase inverter is connected to the PWM pulse generating unit through the reference voltage synthesizer, and pulse control signals generated by the PWM pulse generating unit controls the on and off of the eight IGBT modules to drive the three direct-current motors to operate. The control system is few in used circuit components, simple in structure, stable and reliable in performance and worthy of popularization and application.

The invention relates to an electro-hydraulic position servo system capable of quickly inhibiting impact loads and a control method of the electro-hydraulic position servo system. The invention mainly solves the technical difficulty that the existing electro-hydraulic position servo system is poor in high-intensity impact load interference inhibition and complex in system structure. The electro-hydraulic position servo system capable of quickly inhibiting the impact loads comprises a hydraulic source, an adder-subtracter, a controller, an electro-hydraulic servo valve, a hydraulic cylinder, a load, a displacement sensor, an analog-to-digital converter and a power amplifier, and also comprises two pressure sensors, an impact resistance compensator and a second analog-to-digital converter, wherein the two pressure sensors are arranged in oil passages of a high-pressure chamber and a low-pressure chamber of the hydraulic cylinder; output ends of the pressure sensors are connected with input ends of the analog-to-digital converters; output ends of the analog-to-digital converters are connected with an input end of the impact resistance compensator; a signal output end of the impact resistance compensator is connected with an input end of the adder-subtracter; and a signal output end of the adder-subtracter is connected with signal input ends of the analog-to-digital converters.

The invention discloses a control method and a control device for rapid constant temperature of a PCR (Polymerase Chain Reaction) detector and the PCR detector, in the control method for rapid constant temperature of the PCR detector, an integral separation method is operated in the whole process, and when the output quantity is 0 lt; and utt; when umax is greater than or equal to umax, integral is introduced, PID control is adopted, and when ut is greater than or equal to umax or ut is less than or equal to 0, PD control is adopted. In the temperature changing stage, a time optimal PID control algorithm and a traditional PID control algorithm are adopted for heating or cooling; a traditional PID control algorithm is adopted in the constant temperature stage; at a variable-temperature and constant-temperature switching time point, a temperature fast-setting control algorithm and a self-adaptive control algorithm are adopted; the method has the advantages of being accurate in temperature control, excellent in temperature change benefit, fast in temperature change, fast in constant temperature and small in overshoot, it can be guaranteed that the target value can be reached at the fastest speed, the time needed by the temperature rising stage and the temperature falling stage is shortened, and oscillation and overshoot of temperature waveforms of PCR in the circulation section are reduced.