30results about How to "Good dynamic and static characteristics" patented technology

The invention discloses a speed and current double closed-loop control system and method for a permanent magnet synchronous linear motor. The method comprises the steps of: designing a permanent magnet synchronous linear motor vector control system; designing a fuzzy adaptive sliding-mode speed controller; designing a nonlinear disturbance observation; designing a d-axis fuzzy PID controller; designing a q-axis fuzzy PID controller; obtaining a desired q-axis current reference value as an input of the q-axis fuzzy PID controller according to the designed nonlinear disturbance observer and thedesigned fuzzy adaptive sliding-mode speed controller; setting a d-axis reference current value as 0, and using the id obtained by subtracting park transform from 0 as the input of the d-axis fuzzy PID controller; after the processing by the d-axis fuzzy PID controller and the q-axis fuzzy PID controller, obtaining the ud, uq of the vector control system, and finally outputting the current operating driving voltage of the permanent magnet synchronous linear motor by the anti-park transformation and SVPWM modulation through the vector control and an inverter. The method enhances the robustnessof the system.

The invention discloses a fuzzy sliding mode and neural network based composite control system of a permanent synchronous motor. The control system comprises a rotation speed control outer ring and a current control inner ring, wherein a control unit in the rotation speed control outer ring adopts a composite control module; the composite control module comprises a fuzzy sliding mode control module and a neural network control module; and the fuzzy sliding mode control module and the neural network control module are combined together through two weighing factors lambda n and lambda f. The control system has the advantages of both the fuzzy sliding mode control module and the neural network control module, so that the strong robustness and high stability of the control system of the permanent synchronous motor are realized, the steady state precision is improved, and moreover, the rapidness in control and the strong load disturbance resistance are achieved.

The invention belongs to the technical field of building construction equipment, and relates to a device and method for testing pile-soil interface soil pressure and pore water pressure. Silicon piezoresistive earth pressure gauges and silicon piezoresistive pore water pressure gauges are symmetrically mounted on different sections and at different pile ends on the outer side wall of the high-strength prestressed concrete pipe pile in an embedded manner; pile body drill holes are formed in the inner side of the top of the high-strength prestressed concrete pipe pile; armored cables are communicated with a high-speed static strain indicator YE2539 through the pipe body drill holes; the pile end of the high-strength prestressed concrete pipe pile adopts a steel plate to cover the bottom; the silicon piezoresistive earth pressure gauges and the silicon piezoresistive pore water pressure gauges arranged at the bottommost end are mounted at the bottom of the steel plate, and the gaging heads face downwards. Grooves matched with the armored cables are formed in the steel plate. The device is simple and compact in structure, small in size, light in weight, low in cost, convenient to operate, firm and durable, has excellent dynamic-static features, and is wide in measurement range, and high in measurement accuracy and sensitivity, and easily realizes the test on the soil pressure and pore water pressure at the pile-soil interface adjacent to the pile body.

The invention belongs to the field of controlling power converters of wind power generation systems and relates to a deadbeat power control method for a grid-side converter under network voltage unbalance. The deadbeat power control method comprises the steps that three-phase network voltage, a three-phase alternating side current and direct current side voltage of the grid-side converter are detected, a network voltage sampling value and an alternating side current sampling value under a two-phase rest frame through 3 / 2 coordinate transformation, and network voltage retardation is obtained by delaying one fourth of a power grid period of the network voltage sampling value; an active power reference value is calculated, and an alternating side current reference value is calculated and obtained; transformer alternating current side voltage controlled by the deadbeat power is calculated; in order to compensate for time delay in the calculation and control process, the transformer alternating current side voltage at the next moment is predicted and serves as control voltage; a switch signal controlling a power switch component is obtained and is used for controlling on-off sequence and on-off time of the power switch component. According to the deadbeat power control method for the grid-side converter under network voltage unbalance, the grid-side converter can be effectively controlled to have good dynamic and static characteristics under the condition of network voltage unbalance, and reliable grid connection operation of a wind generating set is ensured.

The invention discloses a hybrid electric vehicle belt-driven started generator (BSG) torque ripple compensating controller and a construction method of the hybrid electric vehicle BSG torque ripple compensating controller. The torque ripple compensating controller controls a composite controlled object. The torque ripple compensating controller comprises a PI adjuster, an extended inverter control module and a current compensating module. The composite controlled object comprises a hybrid electric vehicle BSG, a photoelectrical coded disk and a revolving speed and electrical degree calculation module. A neural network is adopted to build the current compensating module, the neural network is of a four-layer structure, and the neural network is trained by the adoption of the Powell algorithm. According to the hybrid electric vehicle BSG torque ripple compensating controller and the construction method of the hybrid electric vehicle BSG torque ripple compensating controller, the current compensating module is recognized through the neural network, the current harmonic wave of a BSG motor can be restrained effectively, and the torque ripple of the motor is reduced significantly, so that the hybrid electric vehicle BSG system has good dynamic and static characteristics and very strong robustness.

The invention discloses an electromagnetically-driven micro mirror H-infinity control method and an H-infinity control system, which are applied to an electromagnetically driven micro mirror platform composed of an NI PXI controller and LabVIEW software and other hardware equipment. The control method comprises the following steps: S1, selecting an optimization model; S2, selecting a weighting function; S3, regulating the parameters of the weighting function; S4, solving an H-infinity controller; S5, analyzing the performance of a closed-loop system; and S6, discretizing the H-infinity controller through a Z transformation method. The electromagnetically-driven micro mirror H-infinity control method is disclosed in view of the shortcomings of the existing electromagnetically driven micro mirror PID control method. On the basis of ensuring good dynamic and static characteristics of the micro mirror system, the method improves the un-modeled dynamic robust performance of the system, reduces the power consumption of the controller, and restrains the output noise. The method achieves a good control effect, and is more in line with the requirements of practical application.

The invention relates to a brushless DC motor simulation control method and a brushless DC motor simulation system. The brushless DC motor simulation control method comprises steps that S1, back electromotive force in a BLDCM body is acquired; S2, a PI controller is used to establish a speed control module; S3, a Hall signal generating module is established; S4, a reference current module and a current hysteresis control module are established; S5, an inversion circuit module is established. On basis of analysis of brushless DC motor mathematic model, by combining with conventional PI control and fuzzy control advantages, fuzzy PI control and current hysteresis control are used for a permanent magnet brushless DC motor double-closed loop control system used for an electric vehicle, and then simulation verification of a control strategy is carried out, and therefore the rotation speed response of the DC brushless motor is fast and overshoot-free, and strong inhibition performance related to load disturbance is provided, good dynamic, static characteristics are provided, and then the acceleration performance and the driving stability of the electric vehicle are improved.

The invention discloses a method used for prediction convergence control of inductive current in a booster circuit. The method includes: predicting an inductive current value of a next moment through an inductive current value iL(n-1) of a previous moment; predicting to acquire a value of a duty ratio of a switch tube at an nTS time moment according to power conservation; subjecting a calculation result to convergence processing according to a steady-state expected value; predicting to acquire an average value of the duty ratio of the switch tube and the duty ratio of the switch tube in a steady state in the process of convergence so as to acquire a final duty ratio Dx(n) of the switch tube and generate PWM (pulse width modulation) with the duty ratio of Dx(n) to control the switch tube to realize control on inductive current. By the method, the duty ratio of the switch tube is calculated quickly by taking the inductive current as controlled amount; when a given is suddenly increased or reduced, the given can be tracked quickly, so that an algorithm can acquire good dynamic-steady state characteristics.

The invention discloses a bus current sampling asymmetric pulse width modulation method, which comprises a three-phase bridge inverter circuit and a bus current detection unit, and comprises the stepsof generating an initial phase; checking the initial moment; determining a sampling moment according to the rising edge position of the PWM initial phase; sampling the current value of a direct current bus; and calculating the magnitude of the third phase current ib according to a formula ia+ib+ic=0. According to the invention, by analyzing related factors which may influence the current stability, reasonable sampling delay is set, and the current sampling accuracy of the direct current bus is ensured.

The invention discloses a feedback linearization sliding-mode control method of a three-phase three-wire system shunt active power filter. According to the control system, an indirect current control method is adopted, and reference supply current is selected as a reference signal for current tracking control. The feedback linearization technology is used for controlling direct current-side voltage of the shunt active power filter. An integral position tracking sliding-mode control is used for tracking control of the reference signal. The problem that the computing method of a sinusoidal signal in traditional unit is inapplicable in case that the harmonic content of the power voltage is higher is solved. According to the feedback linearization control method, the control of the direct current-side voltage is realized, and the system has good dynamic and static characteristics and possesses good adaptability to variation in load. With the adoption of an integral position tracking sliding-mode controller, the harmonic content of the power current after being compensated can be effectively reduced, and the harmonic compensation effect of the active filter can be improved. The whole control system of the active filter is simple in structure and easy to realize, and has good theoretical and practical significance.

The invention discloses an arbitrary level real-time sector subdivision direct torque control method, which comprises the following steps that: S1: the total number x of sectors of the current motor control system is determined, and the sector correlation coefficient n is determined according to a formula; S2: according to the sector correlation coefficient n and the total number m of basic vectors, the m-layer sector layout is built; S3: the position of motor flux is judged, and the used vectors at the current position in the sector layout is locked at the position; S4, the instantaneous speed of a motor is detected for the synthesis of control vectors; S5: the lock-in positions of the control vectors are determined, so that a coordinate axis of a motor control system is built; S6: zero sectors are determined according to the instantaneous speed of the motor, and in accordance with the zero vectors, a real-time vector table is synthesized; and S7: appropriate vector values are selected from the vector table to be used for controlling the motor. In the method, according to the real-time situation, the optimal vector is synthesized to be used to reduce the torque ripple so as to achieve better static and dynamic characteristics.

The invention discloses an anode hydrogen decoupling control method and system suitable for a proton exchange film fuel cell, and the method comprises the following steps: S100, building a PEMFC hydrogen injection system model: S101, the PEMFC hydrogen injection system is a double-input double-output system, the input of the system is the duty ratio of a hydrogen injection solenoid valve and the opening degree of a back pressure valve, the output is the flow and the pressure of anode hydrogen, and the transfer function of the PEMFC hydrogen injection system is a second-order matrix; and S102,atransfer function of the PEMFC hydrogen injection system is identifiedby adopting an M sequence system identification method; and S200, designing a decoupling controller, which sequentially comprisesthe following steps: S201, designing a feedforward compensation decoupler based on a feedforward compensation principle; and S202, designing two paths of PI controllers to respectively control flow and pressure. According to the invention, the optimal coordination control of the hydrogen flow and the back pressure is realized, so that the PEMFC system obtains good dynamic and static characteristics.

The invention relates to a decoupling control method and system of a fuel cell air system. The method comprises the following steps of recognizing and calculating air parameters, and generating a gaincoefficient and a time coefficient of a decoupling control matrix, wherein the air parameters are an input variable and an output variable obtained through a test; generating an input and output parameter model in an air parameter control loop according to the autoregressive moving average model with the control quantity; substituting the gain coefficient and the time coefficient of the decoupling control matrix into the input and output parameter model in the air parameter control loop to generate a system transfer function relation matrix; and decoupling the system transfer function relationship matrix to generate a decoupling control matrix, and designing a decoupling controller according to the decoupling control matrix. The invention provides the method capable of relatively independently controlling parameters with strong coupling in the fuel cell air system, namely the decoupling control, so that the real-time online operation is realized, and the stable operation of the wholesystem is facilitated.

The invention belongs to the technical field of building construction equipment, and relates to a device and method for testing pile-soil interface soil pressure and pore water pressure. Silicon piezoresistive earth pressure gauges and silicon piezoresistive pore water pressure gauges are symmetrically mounted on different sections and at different pile ends on the outer side wall of the high-strength prestressed concrete pipe pile in an embedded manner; pile body drill holes are formed in the inner side of the top of the high-strength prestressed concrete pipe pile; armored cables are communicated with a high-speed static strain indicator YE2539 through the pipe body drill holes; the pile end of the high-strength prestressed concrete pipe pile adopts a steel plate to cover the bottom; the silicon piezoresistive earth pressure gauges and the silicon piezoresistive pore water pressure gauges arranged at the bottommost end are mounted at the bottom of the steel plate, and the gaging heads face downwards. Grooves matched with the armored cables are formed in the steel plate. The device is simple and compact in structure, small in size, light in weight, low in cost, convenient to operate, firm and durable, has excellent dynamic-static features, and is wide in measurement range, and high in measurement accuracy and sensitivity, and easily realizes the test on the soil pressure and pore water pressure at the pile-soil interface adjacent to the pile body.

The invention belongs to the field of controlling power converters of wind power generation systems and relates to a deadbeat power control method for a grid-side converter under network voltage unbalance. The deadbeat power control method comprises the steps that three-phase network voltage, a three-phase alternating side current and direct current side voltage of the grid-side converter are detected, a network voltage sampling value and an alternating side current sampling value under a two-phase rest frame through 3 / 2 coordinate transformation, and network voltage retardation is obtained by delaying one fourth of a power grid period of the network voltage sampling value; an active power reference value is calculated, and an alternating side current reference value is calculated and obtained; transformer alternating current side voltage controlled by the deadbeat power is calculated; in order to compensate for time delay in the calculation and control process, the transformer alternating current side voltage at the next moment is predicted and serves as control voltage; a switch signal controlling a power switch component is obtained and is used for controlling on-off sequence and on-off time of the power switch component. According to the deadbeat power control method for the grid-side converter under network voltage unbalance, the grid-side converter can be effectively controlled to have good dynamic and static characteristics under the condition of network voltage unbalance, and reliable grid connection operation of a wind generating set is ensured.

The invention discloses a sliding mode variable structure Buck circuit control method based on an extreme learning machine, and the method comprises the following steps: S10, carrying out the analysis of a Buck circuit topological structure, and building a system mathematical model through a state space averaging method; S20, defining a sliding mode surface of a controller, designing an extreme learning machine adaptive law, and designing the controller according to the system mathematical model in the S10; S30, verifying the existence of the sliding mode and the stability of the system by using the Lyapunov theorem according to the controller in the S20. Voltage and current signal changes of the circuit are monitored at the same time, and duty ratio signals output by a system are corrected in real time; the system can rapidly reach the sliding mode surface from any initial state, loads are switched when the circuit is in a steady state, the system can be stabilized to a steady-state output voltage value in a short time, the robustness of a controller is guaranteed, and system buffeting is weakened.

The invention discloses a low-energy-consumption high-pollution-resistance ultrahigh-frequency-response digital hydraulic servo control system and a control method. The system comprises digital hydraulic switch valves, a hydraulic cylinder, a displacement sensor, pressure sensors and a digital controller, main pressure oil is respectively connected with main pressure oil ports of a first digital hydraulic switch valve and a second digital hydraulic switch valve, main return oil is respectively connected with secondary pressure oil ports of a third digital hydraulic switch valve and a fourth digital hydraulic switch valve, a secondary pressure oil port of the first digital hydraulic switch valve and a main pressure oil port of the third digital hydraulic switch valve are respectively connected with a hydraulic cylinder piston cavity oil port, a secondary pressure oil port of the second digital hydraulic switch valve and a main pressure oil port of the fourth digital hydraulic switch valve are respectively connected with a hydraulic cylinder rod cavity oil port, the displacement sensor, a first pressure sensor and a second pressure sensor are respectively connected with a comparator, and a signal generator is respectively connected with magnet exciting coils of the four digital hydraulic switch valves. According to the system, ultrahigh-frequency fluid pulse signals are directly converted, and therefore accurate control of hydraulic servo is realized.

The invention, which belongs to the technical field of permanent magnet synchronous motor controlling, relates to a permanent-magnet synchronous motor, and a power generation alternating operation system and adjusting method. On the basis of a bidirectional transmission circuit of energy, the permanent-magnet synchronous motor converts the electric energy into the mechanical energy in a motor operating state and converts the mechanical energy into the electric energy in a generator operating state, and then the electric energy is returned back to a power supply. With a direct-current voltage variable circuit of a direct-current link, the direct-current voltage is reduced when the permanent magnet synchronous motor works at a low speed; and the direct-current voltage is boosted when the permanent magnet synchronous motor works at a high speed. The direct-current voltage matches the operating speed of the permanent magnet synchronous motor, so that the control performance of the permanent magnet synchronous motor is improved.

The invention discloses a torque fluctuation compensation controller for a hybrid vehicle belt-type drive starter generator (hereinafter referred to as BSG) and a construction method thereof. The torque fluctuation compensation controller controls the compound controlled object, and the rotating The torque fluctuation compensation controller includes a PI regulator, an extended inverter control module and a current compensation module, and the composite controlled object includes a hybrid electric vehicle BSG, a photoelectric encoder disc, and a calculation module for rotational speed and electrical angle; the neural network is used to construct The current compensation module, the neural network adopts a four-layer structure, and uses the Powell algorithm to train the neural network. The method of the present invention can effectively suppress the current harmonics of the BSG motor by using the neural network to identify the current compensation module, significantly Reduce the torque ripple of the motor, so that the BSG system of the hybrid electric vehicle has good dynamic and static characteristics and strong robustness.

The invention discloses a method used for prediction convergence control of inductive current in a booster circuit. The method includes: predicting an inductive current value of a next moment through an inductive current value iL(n-1) of a previous moment; predicting to acquire a value of a duty ratio of a switch tube at an nTS time moment according to power conservation; subjecting a calculation result to convergence processing according to a steady-state expected value; predicting to acquire an average value of the duty ratio of the switch tube and the duty ratio of the switch tube in a steady state in the process of convergence so as to acquire a final duty ratio Dx(n) of the switch tube and generate PWM (pulse width modulation) with the duty ratio of Dx(n) to control the switch tube to realize control on inductive current. By the method, the duty ratio of the switch tube is calculated quickly by taking the inductive current as controlled amount; when a given is suddenly increased or reduced, the given can be tracked quickly, so that an algorithm can acquire good dynamic-steady state characteristics.

The invention discloses a speed and current double closed-loop control system and method for a permanent magnet synchronous linear motor. The method comprises the steps of: designing a permanent magnet synchronous linear motor vector control system; designing a fuzzy adaptive sliding-mode speed controller; designing a nonlinear disturbance observation; designing a d-axis fuzzy PID controller; designing a q-axis fuzzy PID controller; obtaining a desired q-axis current reference value as an input of the q-axis fuzzy PID controller according to the designed nonlinear disturbance observer and thedesigned fuzzy adaptive sliding-mode speed controller; setting a d-axis reference current value as 0, and using the id obtained by subtracting park transform from 0 as the input of the d-axis fuzzy PID controller; after the processing by the d-axis fuzzy PID controller and the q-axis fuzzy PID controller, obtaining the ud, uq of the vector control system, and finally outputting the current operating driving voltage of the permanent magnet synchronous linear motor by the anti-park transformation and SVPWM modulation through the vector control and an inverter. The method enhances the robustnessof the system.

The invention discloses a hybrid magnetic bearing LM neural network inverse decoupling controller for flywheel energy storage, the output ends of two dynamic prediction modules are connected in series with the input end of an LM neural network inverse system, the first dynamic prediction module is composed of two series branches, and the second dynamic prediction module is composed of three series branches and a composite signal calculation module. Each series branch is formed by sequentially connecting a feedback correction module, a control increment calculation module, a predicted value calculation module and an optimal value calculation module in series; the input of the first series branch is a weight value and a reference weight value, the output of the first series branch is an optimal initial weight value, the input of the second series branch is a threshold value and a reference threshold value, the output of the second series branch is an optimal initial threshold value, the advantages of dynamic prediction, LM neural network control and an inverse system are combined, the initial weight value and the threshold value of the LM neural network are optimized by adopting a dynamic prediction module, and the optimal initial weight value is obtained. And independent accurate control among three degrees of freedom of the hybrid magnetic bearing for flywheel energy storage is realized.

The invention provides a winding machine control system, belongs to the field of electrics, particularly relates to improvement of the winding machine control system, and provides the winding machine control system which is convenient in automatic control and high in control precision. The winding machine control system comprises a microprocessor, a displayer, a 6264 extended RAM interface circuit, a clock terminal TL7705 reset circuit, a working state indication interface circuit, a stepping motor interface circuit and an actuating mechanism interface circuit. The winding machine control system is characterized in that the displayer is connected with the output port of a single-chip microcomputer through a displayer interface circuit. The 6264 extended RAM interface circuit, the clock terminal TL7705 reset circuit and the working state indication interface circuit are connected with the state control port of the microprocessor. The output port of the single-chip microcomputer is connected with the stepping motor interface circuit and the actuating mechanism interface circuit through an optical coupler. A switching value input interface circuit and a rotating speed detection interface circuit are connected with the input port of the microprocessor through the optical coupler.

The invention discloses an arbitrary level real-time sector subdivision direct torque control method, which comprises the following steps that: S1: the total number x of sectors of the current motor control system is determined, and the sector correlation coefficient n is determined according to a formula; S2: according to the sector correlation coefficient n and the total number m of basic vectors, the m-layer sector layout is built; S3: the position of motor flux is judged, and the used vectors at the current position in the sector layout is locked at the position; S4, the instantaneous speed of a motor is detected for the synthesis of control vectors; S5: the lock-in positions of the control vectors are determined, so that a coordinate axis of a motor control system is built; S6: zero sectors are determined according to the instantaneous speed of the motor, and in accordance with the zero vectors, a real-time vector table is synthesized; and S7: appropriate vector values are selected from the vector table to be used for controlling the motor. In the method, according to the real-time situation, the optimal vector is synthesized to be used to reduce the torque ripple so as to achieve better static and dynamic characteristics.

The invention discloses a three-phase two-level inverter bus current zero-point drift self-correction device and method. The method includes the following steps: (1) installing a single current sensor on the DC bus to collect phase current information and undergoing static coordinate transformation , the synthetic reference voltage vector V ref ; (2) According to the reference voltage vector V ref The amplitude and phase angle determine the sector; the sector includes the normal operation area and the error self-correction area; (3) when the reference voltage vector V ref When located in the error self-correction area, modify the PWM wave transmission mode in the sector; (4) perform zero-point error self-correction on the collected complementary phase current. The self-calibration method of the invention can keep the control system with good steady-state performance and is easy to implement.

The invention discloses a drive control method of a three-phase single-winding bearingless motor. The drive control method performs closed-loop control on the rotational speed to obtain a current signal of one circuit , through the closed-loop control of the levitation force, three current signals are obtained , and ; and then respectively with , and Three sets of current control signals are formed, which respectively pass through current controllers a, b and c to independently control the three areas a, b and c of a set of armature windings of a three-phase single-winding bearingless motor, and at the same time realize the rotor self-suspension and rotation. The invention overcomes the problem of the coupling relationship between the two sets of windings of the double-winding bearingless motor and the included angle between the two sets of windings, can effectively eliminate the coupling relationship between the torque and the suspension force, and improves the stability and reliability of the system.

The invention discloses a feedback linearization sliding-mode control method of a three-phase three-wire system shunt active power filter. According to the control system, an indirect current control method is adopted, and reference supply current is selected as a reference signal for current tracking control. The feedback linearization technology is used for controlling direct current-side voltage of the shunt active power filter. An integral position tracking sliding-mode control is used for tracking control of the reference signal. The problem that the computing method of a sinusoidal signal in traditional unit is inapplicable in case that the harmonic content of the power voltage is higher is solved. According to the feedback linearization control method, the control of the direct current-side voltage is realized, and the system has good dynamic and static characteristics and possesses good adaptability to variation in load. With the adoption of an integral position tracking sliding-mode controller, the harmonic content of the power current after being compensated can be effectively reduced, and the harmonic compensation effect of the active filter can be improved. The whole control system of the active filter is simple in structure and easy to realize, and has good theoretical and practical significance.