88results about How to "Improve dynamic quality" patented technology

The invention discloses an alternating current induction motor control system based on a self-immunity to interference control. On basis of the prior art, according to ambiguity compensation, a known part, i.e., the ambiguity compensation sc of the rotation speed working characteristics of the alternating current induction motor is input to an expanded state observer, a sum action quantity Omega 3 of a variety of interference of an actual rotation speed Omega of the motor is an estimation of an unknown part instead of an overall rotation speed, thus burdens of the expanded state observer are relieved, meanwhile a variation scope of a parameter adapting object is enlarged, and the estimation precision of the expanded state observer is increased. By the adoption of the control system, better control effects compared with that of the alternating induction motor system based on the traditional self-immunity to interference control are obtained, the robustness and the immunity to interference are stronger, and the dynamic quality is improved.

The invention relates to an automatic setting method for control parameters of a water turbine speed regulating system. According to the method, firstly, T-S fuzzy model identification is conducted on a control object of the water turbine speed regulating system of a real unit to obtain a high-precision simulation system of the water turbine speed regulating system; secondly, according to the simulation system, a target function with the PID control parameters as optimization variables is set up, and the target function is worked out through a gravitational search algorithm to obtain the optimal PID control parameters. Due to the fact that the precision of the set simulation system is high, the characteristics of the real unit can be really reflected, the control parameter optimization result obtained through the simulation system can be directly applied to the real unit, and the dynamic quality of the unit speed regulating system is effectively improved.

An inexpensive and simple circuit for improving the quality of a dynamic image, with appropriate, flexible dynamic image qualities processing, even with plural input signal sources. A memory unit has a region for storing images of at least one screen, and a memory control unit for writing image data to the memory unit on the basis of a first clock and a first image synchronizing signal and for outputting image data read out from the memory unit on the basis of a second clock and a second image synchronizing signal. A clock generating unit provides the second clock, and a synchronizing control unit inputs the second clock and outputs the second image synchronizing signal. The synchronizing control unit generates one signal asynchronous to the first image synchronizing signal, by dividing the second clock, and another that is and synchronized with the first synchronizing signal, by using the second clock, and selects one of the signals it has produced to be output as the second image synchronizing signal. In a case of multiple input signals, then such fourth image synchronizing signals equal in number to the input signals are produced.

An image display device comprising: a display 18 to display an input image and a black image within one frame period; a motion detector 14 to detect a motion information from the input image; a display ratio controller 16 to set a black display time ratio as a ratio of a black period to said one frame period based on the motion information, the black period being a period for displaying the black image within said one frame period; and a display luminance controller 30 to suppress, within a predetermined range, a luminance fluctuation caused by a change in the black display time ratio, the luminance fluctuation corresponding to a fluctuation of a total luminance for said one frame period.

The invention discloses a control system of a high frequency switching power supply for a Cz silicon single crystal furnace and a control method. The control method includes the steps of combining self-adaptive fuzzy control and sliding mode variable structure control, and aiming at a high-frequency switch heating electric power for the Cz silicon single crystal furnace to design a power controller based on a self-adaptive fuzzy control and sliding mode variable structure control method. The control system of the high frequency switching power supply for the Cz silicon single crystal furnace and the control method play respective advantages of fuzzy control and sliding mode variable structure control, further improve dynamic performance of the system, have good robustness for input voltage or load disturbance, and relieve or avoid vibration which generally happens to a sliding mode.

The invention relates to a maglev train system control method based on integral sliding mode control of a double power reaching law (DPRL-I-SMC), and especially relates to a maglev train system control method based on integral sliding mode control of an improved double power reaching law. A sliding mode controller is designed by combining the double power reaching law and the exponential reachinglaw and using a saturation function and an integral function. The improved DPRL-I-SMC method is superior to the traditional sliding mode control (SMC) and power reaching law-integral sliding mode control (PRL-I-SMC) methods in all aspects, can effectively eliminate the chattering of the system, reduce overshoot, accelerate convergence and overcome nonlinear factors to make a nonlinear system stably suspended, and shows excellent dynamic performance and anti-jamming performance.

This invention relates to a correctional method of water level in the steam drum based on the temperature and pressure that belongs to the heat process control field including the following steps: the temperature difference DeltaT is linear to the water supply flow increment in small range, DeltaQ=-kDeltaT, theDeltaQ is used as the feedforward value in the main circuit of the cascade control of the water level in the steam drum, to eliminate the adverse effect of 'false water level' on the water supply control. When the load increases,DeltaQ>0, and the steam drum working condition is nearly stable, the correctional value is 0; when the load decreases, the controlled water supply is suppressed, DeltaQ<0; when the water flow increases, the temperature T of the steam drum decreases and the water supply flow increment DeltaQ<0; when the water supply flow is nearly constant, the correctional value is 0; when the water supply flow decreases, the controlled supply flow increases, DeltaQ>0. This method introduces the effect of steam drum pressure and water temperature on the steam bubble in the steam drum water to correct the water level control, which suppresses the overshoot phenomenon and ensures the steady operation of the boiler.

An inexpensive and simple circuit for improving the quality of a dynamic image, with appropriate, flexible dynamic image qualities processing, even with plural input signal sources. A memory unit has a region for storing images of at least one screen, and a memory control unit for writing image data to the memory unit on the basis of a first clock and a first image synchronizing signal and for outputting image data read out from the memory unit on the basis of a second clock and a second image synchronizing signal. A clock generating unit provides the second clock, and a synchronizing control unit inputs the second clock and outputs the second image synchronizing signal. The synchronizing control unit generates one signal asynchronous to the first image synchronizing signal, by dividing the second clock, and another that is and synchronized with the first synchronizing signal, by using the second clock, and selects one of the signals it has produced to be output as the second image synchronizing signal. In a case of multiple input signals, then such fourth image synchronizing signals equal in number to the input signals are produced.

The invention discloses a fractional periodic repetitive controller suitable for a position servo. The fractional periodic repetitive controller constructs a chattering-free attractive rule based on sine switching, further introduces a suppression idea of repetitive control on tracking and periodic disturbance of periodic signals, designs a fractional periodic repetitive control method based on the sine switching attractive rule according to fractional periodic symmetrical characteristics of disturbance signals in a time domain, and seeks a control sequence so that the output can track the periodic reference input accurately after limited control steps. The fractional periodic repetitive controller effectively suppresses the periodic disturbance at the same frequency of the reference position signals in the position servo system, and has good dynamic quality.

The invention discloses a sliding formwork control method used in motion control of a virtual axis machine tool cutter, comprising the following steps: planning the space motion trail of the cutter in the processing procedure of a virtual axis machine tool; determining the expected motion trail of each active pair of the virtual axis machine tool in the processing procedure; then establishing the mathematical models of the controlled objects of each control branch circuit of the virtual axis machine tool; detecting and determining the actual motion state of each active pair of the virtual axis machine tool; calculating the function of the switching surface according to the sliding formwork control theory; determining the motor drive controlled variable of each control branch circuit of the virtual axis machine tool and sending to each motor driver; and finally driving each active pair by the motor drive controlled variable of each control branch circuit so as to drive the virtual axis machine tool cutter to realize the expected motion. In the invention, the precise models of the controlled objects of each branch circuit are not needed to be established, and the high-precision control towards the motion of the cutter can be realized by utilizing the excellent characteristics of the sliding formwork control technology; and the controlled variable of the sliding formwork is constituted by continuous functions with no trembling problems.

The invention discloses a system and a method for stabilizing frequency and voltage of the system during large load phase step of the isolated power grid system. The method includes: S1, increasing evaporation capacity of a boiler, starting a bypass system to maintain stability of steam pressure and automatically regulating opening of a bypass valve via a pressure control mode; and S2, opening a regulating valve of a steam turbine after a DEH (digital electric hydraulic) speed regulating system detects that the rotation speed of a generator set is reduced, and simultaneously reducing the opening of the bypass valve under a pressure feedback effect of the bypass system. By the aid of a large-capacity energy storage effect of the bypass system, the bypass valve is opened quickly, load of the boiler is reduced, and the system is protected against being in an over-voltage state; the bypass valve is closed quickly, output power of the generator set is quickly adjusted, large motor load is carried, balance of total power supply quantity is realized, and accordingly an isolated power grid outputs current with stable frequency and voltage under the condition of large load phase step; and required high power electric energy does not need to be outputted in advance, heat dissipation of the generator set of the isolated power grid can be realized effectively, debugging of the set is carried out conveniently, and cost is saved.

The invention provides an inversion sliding mode mechanical arm controller design method based on a finite time disturbance observer. According to the method, a dynamic model of a mechanical arm is established at first, then a finite-time disturbance observer for external disturbance is designed and stability analysis is carried out, real-time detection and online estimation on unknown disturbancequantity are carried out, a controller of a nonsingular terminal sliding mode is designed by using the obtained disturbance estimation information, in combination with an inversion and sliding mode control method, the control law of a system is solved by designing an intermediate virtual quantity, moreover, a reaching law control method is added, then the asymptotic stability of the system is proved by a lyapunov function theory, and finally, the asymptotic stability of the system is verified through simulation.

The invention relates to a pilot-operated electrical feedback proportional direction valve comprising a pilot-operated level and a main level, wherein a decompression base plate is arranged between the pilot-operated level and the main level; the pilot-operated level comprises a stroke control type proportional direction valve, a proportional electromagnet A and a proportional electromagnet B; the lower part of the pilot-operated valve body is provided with a plurality of hydraulic fluid ports; the pilot-operated valve core is communicated with each hydraulic fluid port through an oil duct; each hydraulic fluid port is communicated with the oil duct of the main level; the main level comprises a main valve body, a main valve core, a main valve core centering spring, a main valve end cover A and a main valve end cover B, wherein the lower part of the main valve body is provided with a hydraulic pressure fluid port P, an oil inlet and outlet A, an oil inlet and outlet B, a return opening T, a control hydraulic fluid port X and an oil drain port Y; the main valve body leads to the hydraulic fluid port via the oil duct; a pin fixed on the main valve end cover B is arranged in a chute; and the end part of the main valve core provided with the chute is fixedly connected with a position sensor. The invention has the advantages of high sensitivity, high dynamic quality and high reliability.

The invention discloses a display system and a method thereof for promoting the image display quality. The system comprises a provided image control signal at least comprising a vertical synchronizing signal and a provided image area divided by at least one light source, wherein the image area comprises a plurality of pixels and each pixel receives one image signal for displaying image. A plurality of first gain coefficients are obtained by aid of the image control signal, wherein each first gain coefficient depends on the position relation of each pixel and each light source in the image area divided by each light source. And a dynamic compensation is carried out to obtain a compensation picture calculated by an operation of the image signal, received by each pixel, and each first gain coefficient in the image area divided by each light source. The different phase relationship of the control signal and pixel gray scale of backlight lighting tubes can be improved, and ghost images generated in dynamic images can be avoided by aid of measuring a plurality of the gain coefficients and engaging with the overload driving method, thereby improving animation quality.

The invention discloses a heuristic gain adaptive PID control method for a complex nonlinear pumped storage power unit speed regulating system. First, a heuristic gain adaptive PID controller is set up based on a simple and practical parallel PID control structure; then, a fine model of a nonlinear pumped storage power unit speed regulating system is constructed; next, a multi-objective function of nonlinear pumped storage power unit speed regulating system HGS-NPID control parameter optimization is built; and finally, nonlinear pumped storage power unit speed regulating system HGS-NPID control parameters are optimized using a multi-objective artificial sheep flock algorithm. The heuristic gain adaptive PID control method for a nonlinear pumped storage power unit speed regulating system presented by the invention is simple to implement, and has strong real-time performance. The control gain can be adjusted online and adaptively according to the change of the operating point. The method fully adapts to the hydraulic shock and nonlinearity of the pumped storage power unit speed regulating system, and can improve the dynamic quality of the conventional control method under different working conditions of a water head.

The invention discloses a discrete two-cycle repeating control method based on a hyperbolic secant attraction law. A reference signal formed via superposition of two different cyclic symmetries is given; according to cyclic symmetry characteristics of interference signals of different cycles in a time domain, ideal error dynamics are respectively produced based on the hyperbolic secant attractionlaw; according to the ideal error dynamics, an e / v signal conversion module is established, output signals are used for correction of sub-repetitive controllers, and a discrete double cycle repetitivecontroller is formed after the sub-repetitive controllers are connected in parallel; output signals of the discrete double cycle repetitive controller are calculated as input to a servo object, and aservo system is enabled to change along with reference signals. Specific controller parameter setting work can be performed according to amplitudes of different periodic interference and indexes indicating system tracking error convergence performance and steady state performance; a method for calculating a monotonous decreasing region indicating the tracking error convergence performance and thesteady state performance, an absolute attraction layer and a steady state error band boundary is provided. The invention provides a discrete double cycle repetitive controller based on the hyperbolicsecant attraction law; the controller is advantaged by time domain design, fast suppression of multi-cycle interference, good dynamic quality, reduced memory occupancy and high control precision.

The invention provides a vehicle built-in permanent magnet synchronous motor controlling method. The method comprises steps of 1, establishing permanent magnet synchronous motor mathematic models including a voltage equation model, an electromagnetic torque equation model and a torque balance equation model; 2, designing a sliding mode surface and a sliding mode control law, so as to achieve sliding mode control of the electromagnetic torque of a motor; 3, based on the electromagnetic torque value Te, performing decomposition to obtain a quadrature-axis current iq and a direct-axis current id; 4, based on iq, id, Udc, quadrature-direct axis voltage references U'q and U'd, obtaining quadrature-direct axis current reference values i<*>[q] and i<*>[d] by decomposition; 5, decomposing i<*>[q] and i<*>[d] to obtain the quadrature-direct axis voltage references U'q and U'd; and 6, based on the U'q and U'd, obtaining two phase stationary voltages U[alpha] and U[beta] by coordinate conversion, taking the U[alpha] and U[beta] as the input, and obtaining three phase reference voltages Ua, Ub and Uc after modulating the models to drive an inverter and the motor to work. The control method can ensure stable operation of the motor under any working condition.

The present invention discloses a model identification-based fuzzy PID control method and device. The method includes the following steps that: input parameters are acquired; variable universe controlis performed according to the input parameters, so that self-adjusting control parameters deltakp, deltaki and deltakd are obtained; identified control model parameters are acquired; the identified control model parameters are parameterized, and control parameters are outputted; the control parameters are optimized, and basic control parameters kp0, ki0 and kd0 are outputted; and superposition operation is performed on the self-adjusting control parameters deltakp, deltaki and deltakd, and the basic control parameters kp0, ki0 and kd0, so that real-time PID parameters kp, ki and kd are obtained. According to the method and device provided by the present invention, a model identification module is introduced based on an existing fuzzy PID control, and therefore, it can be ensured that themodel identification algorithm can effectively accomplish identification, the stability, rapidity and accuracy of a control system are obviously improved, and the dynamic quality of the control systemis improved.

The invention discloses a nonlinear compensation and control method and system for an inductance model of a switched reluctance motor. The method comprises the steps of designing a fuzzy reasoning rule by using a torque deviation capable of reflecting errors of an SRM linear model and a change rate of the torque deviation as fuzzy reasoning input information, constructing a fuzzy compensator, andachieving the nonlinear feedforward compensation for a linear inductance model; and introducing reinforcement learning, designing a return function, and matching the return function with the fuzzy compensator to further realize nonlinear adaptive optimization compensation of the inductance model and achieve the purpose of indirectly describing strong nonlinear characteristics of the inductance. According to the invention, the dynamic quality of the control system can be effectively improved, and the SRM torque ripple is inhibited. The system can form an embedded system, avoids direct modelingof nonlinear characteristics, is small in calculation amount, and facilitates the online control of the switched reluctance motor.

The invention relates to a method for controlling the outlet temperature of an electric heater in a supercritical water treatment system. The method is characterized by comprising the following steps: introducing a furnace temperature controller as an auxiliary controller in a cascade control mode to control the power output of the electric heater; forming a negative feedback loop by utilizing a control variable introduced to an inner ring; and introducing fluid flow as feedforward into the control so as to directly act on the power output of the electric heater; performing difference value comparison on the inlet temperature and outlet temperature of the heater, and limiting the amplitude of the whole control output according to the required power fitting calculation formula. The method can be used for effectively overcoming the disturbance of self thermal inertia, inlet temperature changes and fluid flow changes of the electric heater on the outlet temperature control of the electric heater, and realizing quick and accurate control on the outlet temperature of the electric heater.

The invention discloses a fuzzy predictive control system for a combustion process of a lime kiln as well as a control method of the system and belongs to the field of control on the combustion process. The fuzzy predictive control system comprises a reference information input module, a fuzzy controller, a fuel valve, a lime kiln control device, a prediction module, a feedback module and a correction module. A combustion temperature control system of the lime kiln has the characteristics of nonlinearity, time variability, model structure uncertainty and the like, a predictive control and fuzzy decision combined control method is adopted, an advanced prediction function of predictive control and the optimal control effect of fuzzy control in a large deviation range are integrated, and the temperature control problem of a large-time-delay nonlinear system is solved; the system can be put into actual production operation, the dynamic quality in the lime calcining temperature adjustment process is effectively improved, and the good actual application effect is realized.

The invention relates to a novel approaching sliding mode control method for a permanent magnet synchronous motor, belonging to the field of motor control. The method comprises a step of inputting a speed deviation between a motor speed set value and a motor speed into a sliding mode variable structure controller and outputting a q-axis current set value, a step of collecting three-phase alternating current and obtaining d-axis current and q-axis current through coordinate system conversion, a step of obtaining d-axis voltage and q-axis voltage by conversion and regulating a three-phase inverter by a switching signal obtained by voltage space vector pulse width modulation, and a step of finally, controlling the motor by using the output amount of a three-phase inverter. The sliding mode variable structure controller designed based on the novel approaching law in the invention can improve the dynamic quality of a controlled system, the controller has faster response speed and smaller overshoot, and the robustness and rapidity of the system are improved.

The invention relates to a direct-drive type permanent magnet synchronous motor dedicated to mine hoister, which is a driver motor dedicated to large machinery equipment, belonging to the technical field of electromotor. The direct-drive type permanent magnet synchronous motor dedicated to mine hoister provided by the invention can improve driving efficiency of the mine hoisting system, reinforce reliability of system running, reduce maintenance difficulty and dispense with reduction gears. The direct-drive type permanent magnet synchronous motor dedicated to mine hoister comprises a motor shell, a rotor embedded with a permanent magnet is arranged at the center in the motor shell, a stator magnetic core winded with stator winding is arranged at the outside of the rotor, and the stator magnetic core is fixed on the motor shell. The invention is characterized in that the stator winding is connected with a frequency converter by leads.

The invention discloses a control method for a sliding mode variable structure of a PMSM speed regulation system. According to the method, a sliding mode variable structure controller based on a novelreaching law is used, an integration item of an error signal is introduced into design of a sliding-mode surface, requirement for an acceleration signal in a controlled variable is avoided, and stable-state errors of the system are reduced; a speed-change reaching law is introduced, so that the reaching speed of the system is associated with change of a system quantity of state, and the dynamic quality of the system is improved; and in addition, a continuous function sigmoid(s) is used to replace a sign function sgn(s) in the routine reaching law, and buffeting is reduced further. Compared with a traditional PI control method, the given speed signal can be tracked in a better and rapider way, and higher robustness for the external disturbance of the system is provided.

The invention discloses an electric power system stabilizer and a method, relates to the technical field of electric power, and mainly aims to overcome the shortcoming of relatively poor low-frequency oscillation suppression effect of the existing electric power system stabilizer. The electric power system stabilizer comprises a voltage regulator, an active compensation frequency regulator, an automatic exciting regulator, a stabilizer, a control additional apparatus and a generator network, wherein the stabilizer comprises a sensor, a high-frequency filter, a compensator and an amplifier; the automatic exciting regulator comprises an exciting power unit and an exciting regulator; and the voltage regulator comprises a voltage measurement comparison unit, a pulse width modulator, a low-frequency protection unit and a voltage-stabilizing circuit.

An air compressor anti-surge generalized predictive control system and method relate to the field of anti-surge predictive control of air compressor control systems in the steel and chemical industries. The system includes a forward collector, a predictor and a backward actuator. The forward collector monitors the inlet and outlet pressure and flow of the pipe network, and is connected to the predictor in the form of PCI bus; the backward actuator controls the vent valve, has the function of sound and light alarm, and is connected to the predictor in the form of RS485; the predictor The controller adopts the air compressor anti-surge generalized predictive control method, combines the production load setting information input by the keyboard and the on-site operation data obtained by the forward collector, calculates, displays and stores the air compressor operating parameters, and uses the RS485 method to backward The actuator outputs predictive control information to realize predictive control of air compressor anti-surge. The system adjustment process of the invention is gentle, the control precision and dynamic quality are high, the operation is stable and reliable, and the surge phenomenon of the air compressor can be effectively prevented.

The present invention discloses a liquid crystal display panel and a black picture inserting method thereof. A plurality of coupling scanning beams are added to a plurality of scanning beams which are originally vertical to each other. The coupling scanning beams are connected with the stored capacitor of each pixel. The switch of each pixel is controlled by the scanning beams, so a data signal is selectively conveyed from a data wire to a liquid crystal capacitor and the stored capacitor. The coupling scanning beams can couple the stored capacitor and a pixel electrode by using voltage difference to reach a black picture inserting effect. In this way, a black inserting effect can be reached without increasing a time pulse frequency and without changing a black lighting module design. Then, the dynamic quality of a display picture is enhanced.

The invention relates to an uninterruptible power supply for a high-frequency soft switch of a locomotive air conditioner, which mainly comprises an access port of a contact network and a three-phase inverter. The uninterruptible power supply is characterized in that after passing a multiple filter network, an input voltage introduced by the access port of the contact network is converted into an output voltage by passing a primary rectification filter circuit, a high-frequency inverter, a high-frequency boost transformer, a secondary rectification filter circuit, a PWM (Pulse-Width Modulation) chopper circuit and the three-phase inverter in sequence; and a battery circuit is connected in parallel between the PWM (Pulse-Width Modulation) chopper circuit and the three-phase inverter. The invention also discloses a realization method of the uninterruptible power supply for a high-frequency soft switch of a locomotive air conditioner. The uninterruptible power supply can inhibit the peak pulse voltage of the contact network, and the PWM (Pulse-Width Modulation) chopper circuit adopts a single-phase bridge inverter booster circuit and is controlled by an analog circuit method, and thus, the uninterruptible power supply has the characteristics of good dynamic quality, high anti-jamming capability, and the like.

The invention discloses a model-free adaptive PID control method for a hydroelectric generating set adjusting system. The model-free adaptive PID control method is used for effectively regulating andcontrolling a hydroelectric generating set and comprises the following steps of: performing dynamic linear conversion on a nonlinear hydraulic turbine set adjusting system by using a compact format dynamic linearization (CFDL) method; setting initial values of an input quantity and an output quantity of a control system according to historical operation data of the set; introducing a concept of apseudo partial derivative, and setting an initial value; setting a control performance index function and a pseudo partial derivative estimation criterion function; and acquiring current actual outputand expected output, and calculating a system control law in combination with the pseudo partial derivative. Besides, PID control and a model-free adaptive controller (MFAC) based on the CFDL are partially connected in parallel to obtain a new control method, rotating speed oscillation in the starting process of the set can be effectively reduced, better adjusting quality is achieved, and the actual production requirement of a hydropower station is better met.