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34results about How to "Improved current control performance" patented technology

Current PI control system and method of direct current motor

The invention discloses a current PI control system and method of a direct current motor and belongs to the technical field of direct current motor control. The control system comprises a controller, a power drive unit, a direct current motor and a current detection sensor. The controller is composed of a comparator, a proportioner, an integrator and a summator. The control method of the control system includes the following steps that an equivalent electric inertia parameter B of the direct current motor is identified at first, and a proportion control parameter Kp and an integral control parameter Ki of the controller are adjusted. When the control system is debugged, the parameters of the PI controller are adjusted according to parameters of the direct current motor so that the parameters of the controller can be adjusted with a target. Blindness in adjusting the parameters of the PI controller is hindered, time and labor are saved and the good current control effect can be obtained.
Owner:JIANGSU YUYUE MEDICAL EQUIP&SUPPLY CO LTD +2

Model-free predictive current control system of Boost PFC converter and control method thereof

The invention relates to a model-free predictive current control system of a Boost PFC converter and a control method thereof. The control system includes a Boost PFC converter system, a current inner-loop control module, and a voltage outer-loop control module. The method realizes adaptive modeling of the converter running in different conduction modes by establishing a unified super-local modelbased on real-time update, and then designs a matched model-free predictive current controller, thereby not only improving the robustness of the parametric variation and the internal and external disturbances of the converter, but also avoiding additional pattern recognition algorithms or hardware detection circuits, increasing the dynamic response speed of the current control loop, improving thecurrent control performance of the converter in light and medium load operating conditions.
Owner:HEFEI UNIV OF TECH

Sensorless model predictive control system and method for vehicle permanent magnet synchronous motor

The invention relates to a sensorless model predictive control system and a method of a permanent magnet synchronous motor for vehicles. The system comprises a maximum torque-current ratio controllerfor obtaining a reference value of a stator current; Stator current feedback module: acquiring a stator current feedback value; A position observer module for observing the rotational speed and the rotor position angle of the permanent magnet synchronous motor; A current predictive control module, which performs current predictive control according to the stator current reference value, the statorcurrent feedback value, the speed of the permanent magnet synchronous motor and the rotor position and outputs a stator voltage reference value; A rotating high-frequency voltage injection module that generates a rotating high-frequency voltage signal and superimposes the rotating high-frequency voltage signal and a stator voltage reference value to obtain a control voltage; SVPWM modulation module: SVPWM modulation of the control voltage to obtain inverter control signal, inverter connected to the permanent magnet synchronous motor. Compared with the prior art, the invention not only can realize the optimization of the current control performance, but also can simplify the controller hardware and improve the reliability of the control system.
Owner:TONGJI UNIV

Method for improving low-gray-scale color shift and OLED display panel

ActiveCN109545128AImprove the problem of low grayscale color castReduce the ratioStatic indicating devicesPower flowRefresh cycle
The embodiment of the invention discloses a method for improving low-gray-scale color shift and an OLED display panel. The method includes the steps: setting a first lighting rule for setting a pixelunit by using a first brightness value in a set time period in each refresh cycle of the OLED display panel in any low gray state, and controlling the OLED panel for display by using the first lighting rule. Since the first brightness value for lighting the pixel unit in the first lighting rule is greater than a second brightness value for lighting all the pixel units in the entire refresh cycle and an OLED is a current-driven device, the brightness of the pixel unit is increased when the first lighting rule is used for controlling the display of the OLED display panel, the control current ofa TFT is also increased accordingly. Since the current control capability of the TFT is enhanced, the impact of a leakage current of the TFT on the color shift is also decreased, thereby effectively solving the problem of low-gray-scale color shift of the OLED display panel.
Owner:EVERDISPLAY OPTRONICS (SHANGHAI) CO LTD

Method for optimally designing parameters of double-fed wind-driven power generation control system

The embodiment of the invention provides a method for optimally designing the parameters of a double-fed wind-driven power generation control system, which comprises: firstly, building a mathematical model of a double-fed wind-driven power generator; secondly, performing Z conversion of a component of the mathematical model by using a converter in a discrete domain according to the built mathematical model so as to obtain a characteristic equation of a transfer function of a current inner loop under the discrete domain; thirdly, obtaining a proportional integral PI parameter of the current inner loop according to the characteristic equation of the transfer function of the current inner loop under the discrete domain; and fourthly, introducing the obtained PI parameter into a PI regulator in the control system to optimize the regulation capacity of the PI regulator. Therefore, the control effect on the current of a double PWM converter is improved and the operation performance of a double-fed wind-driven power generation system is optimized and improved.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)

Current detection circuit of resonant converter and control method thereof

The invention discloses a current detection circuit of a resonant converter and a control method thereof. The current of a controlled branch is converted into an induction signal through a current sampling circuit, the induction signal is integrated through a resettable integrating circuit and then is output to an ADC of a digital controller for sampling, a current operation unit calculates the average information of the current of the controlled branch in an integration time period according to a sampling value, a PWM module and a drive amplifying unit output a drive signal after the averageinformation of the current is operated through a current regulator, a switch bridge arm of the converter is controlled, and the resettable integrating circuit is reset. The current of the resonance converter is rapidly detected and controlled, and dynamic performances of the converter can be improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Novel power quality controller based on current-mode inverter and control method thereof

The invention relates to a novel power quality controller based on a current type inverter and a control method thereof. The technical characteristics are that the novel power quality controller comprises an energy storage inductor, an inverter circuit, a low-pass filter circuit and a connection inductance unit. The energy storage inductor is connected with the inverter circuit and used for providing inverter DC side current. The inverter circuit is used for generating AC current required for regulating the power quality and charging the energy storage inductor. The inverter circuit is connected with the low-pass filter circuit and used for filtering the high-order harmonics in the output PWM current of the inverter circuit. The connection inductance unit is connected in series between a power supply and a load and used for generating a bias voltage required for compensating the load voltage. The novel power quality controller is simple in structure and convenient to control.
Owner:河北德瑞特电器有限公司 +1

Motor model prediction current control method and device, electronic equipment and medium

One or more embodiments of the invention provide a motor model prediction current control method and device, electronic equipment and a medium. According to the method, an optimal voltage vector is selected from non-zero voltage vectors according to the principle of proximity after a sector where a reference voltage vector is located is obtained in a fast vector selection mode; a dead zone is configured for each inverter bridge arm; the dead-zone voltage vector is obtained according to the flow direction of the three-phase current of a motor; the influence of the high-amplitude common-mode voltage generated by the zero vector equivalent to the dead-zone voltage vector and the zero vector in the to-be-selected vectors on the service life of the motor is solved; and the dead-zone voltage vector duration is used as a variable for optimization, and the control effect is improved.
Owner:NORTH CHINA UNIVERSITY OF TECHNOLOGY

Doubly-fed wind power converter low-voltage traversing topological structure and control method thereof

The invention discloses a doubly-fed wind power generator low-voltage traversing converter topological structure and a control method thereof. The low-voltage traversing converter topological structure mainly consists of a triangular structure consisting of bidirectional controllable silicon, and a voltage source type back-to-back converter, and is characterized in that: the triangular structure is formed by connecting three pieces of bidirectional controllable silicon and resistors sequentially; and the three peaks of the triangular structure are connected with three alternating-current output points of a doubly-fed motor rotor side converter respectively. Aiming at the capacity requirement on the rotor side converter during low-voltage traversing of the doubly-fed wind power generator, the invention adopts that: the triangular structure consisting of the bidirectional controllable silicon is arranged in the doubly-fed motor rotor side converter; two working modes, namely active bar crowing and cooperative control, are formed due to matched control of the controllable silicon in the triangular structure and a bridge-arm switch of the doubly-fed motor rotor side converter, so thatthe processing capability to the current of a doubly-fed motor rotor; therefore, the low-voltage traversing function of the doubly-fed wind power generator is realized better due to low-cost and high-reliability converter structural variation.
Owner:HEFEI UNIV OF TECH

A model-free predictive current control system and control method for boost PFC converter

The invention relates to a model-free predictive current control system of a Boost PFC converter and a control method thereof. The control system includes a Boost PFC converter system, a current inner-loop control module, and a voltage outer-loop control module. The method realizes adaptive modeling of the converter running in different conduction modes by establishing a unified super-local modelbased on real-time update, and then designs a matched model-free predictive current controller, thereby not only improving the robustness of the parametric variation and the internal and external disturbances of the converter, but also avoiding additional pattern recognition algorithms or hardware detection circuits, increasing the dynamic response speed of the current control loop, improving thecurrent control performance of the converter in light and medium load operating conditions.
Owner:HEFEI UNIV OF TECH

Robust model predictive current control method and device for permanent magnet synchronous motor

ActiveCN113258837AReduce current errorReduce parameter sensitivityAC motor controlElectric motor controlVoltage vectorPermanent magnet synchronous motor
The invention discloses a robust model predictive current control method and device of a permanent magnet synchronous motor. According to the device, target stator current d-axis and q-axis current components output by a stator current instruction generation module, rotor electrical angular velocity output by a conversion module and stator current direct-axis and quadrature-axis components under a rotating coordinate system output by a current vector conversion module are calculated, and an optimal voltage vector is obtained; a driving signal required by an inverter power switch device according to the obtained optimal voltage vector is generated; and the driving signal of the inverter power switch device acts on a three-phase inverter module, so that the permanent magnet synchronous motor realizes robust model predictive current control. The device effectively reduces the current error caused by parameter change when the predicted current is calculated by the algorithm, reduces the parameter sensitivity of the control algorithm, improves the current control effect, and is small in calculation burden and convenient to apply.
Owner:CHINA UNIV OF MINING & TECH

Semiconductor structure and manufacturing method thereof

The invention provides a semiconductor structure and a manufacturing method thereof. The manufacturing method comprises the steps of providing a semiconductor substrate and an epitaxial layer located on the semiconductor substrate; a plurality of main grooves are formed in the epitaxial layer, the bottom surfaces of the main grooves are exposed out of the semiconductor substrate, and the remaining epitaxial layer serves as a plurality of dummy grids; the dummy gate is provided with a top surface and a bottom surface which are opposite to each other, the width of the top surface of the dummy gate is greater than that of the bottom surface, and a contraction part is arranged between the top surface and the bottom surface, so that the subsequently obtained metal gate structure is also in a shape with a wide upper part and a narrow lower part and is provided with the contraction part, and the current control capability of the metal gate structure is improved; the stray capacitance of the metal gate structure is reduced, and the electrical performance of the semiconductor device is further improved. The semiconductor structure provided by the invention comprises the dummy gate or metal gate structure.
Owner:NEXCHIP SEMICON CO LTD

Current prediction control method of duplex winding induction generator system

The invention discloses a current prediction control method of a duplex winding induction generator system, which relates to the technical field of induction motor driving control, and a PI regulator is used to control bus voltage of a control winding side and a power winding side of a five-phase duplex winding induction generator system as an object. A rotor flux linkage amplitude and an orientation angle are calculated by using a voltage model rotor flux linkage, a current prediction model of a double-winding induction generator system is established, and a predicted value of a control winding current in a next control period is calculated in the current prediction model through the control winding current and the rotor flux linkage amplitude, with a target that the predicted value of the control winding current follows the given value, calculation is performed to obtain the required control winding voltage, the control winding voltage is sent into space vector pulse width modulation, and then a switching signal is output. The current prediction control method is easy to implement, effectively overcomes the problem that parameter setting is difficult in a traditional method, has good current control performance, and enables the dynamic performance of the whole control system to be improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

New energy grid-connected inverter self-synchronizing voltage source control method

The invention discloses a new energy grid-connected inverter self-synchronizing voltage source control method, and belongs to the field of new energy power control. The control comprises the following steps that a new energy grid-connected inverter provides a frequency and voltage active support control method with a large power grid self-synchronization characteristic according to active power and reactive power of a system; in order to adjust the impedance characteristic between the internal potential of the self-synchronizing voltage source of the new energy grid-connected inverter and the large power grid voltage, an impedance adaptive control algorithm is adopted while a current instruction of the self-synchronizing voltage source is given; and finally, a current closed-loop control algorithm based on a resonance controller is adopted in a two-phase synchronous rotating coordinate system, so that the new energy grid-connected inverter gives consideration to the improvement of the grid-connected current performance while realizing the white synchronization characteristic, the current control capability under the unbalanced condition of the power grid is improved, and the overall performance of the new energy grid-connected inverter is improved.
Owner:HEFEI UNIV OF TECH

A corner-type statcom based on grid voltage feed-forward control and its control method

The invention relates to an angle-type STATCOM based on feedforward control of power grid voltage and a control method of the angle-type STATCOM. The control method comprises steps of superposing output quantity of a feedforward controller on the output quantity of a current inner ring, and judging whether the power grid is in a steady state or in a transient state before the STATCOM is unlocked; if the power grid is in the steady state, using a feedforward item based on power grid voltage phase angle compensation as the output quantity of the feedforward controller, and after a control system is stable, switching to take the feedfoward item based on direct acquisition of power grid voltage as the output quantity of the feedforward controller; and if the power grid is in the transient state, using the feedfoward item based on direct acquisition of power grid voltage as the output quantity of the feedforward controller. According to the invention, it can be achieved that the impact current is smallest during unlocking under the condition that the power grid is in the steady state; based on the feedforward item of the power grid voltage, true conditions of the power grid voltage can be well reflected under the condition that the power grid is in the transient state; the smaller the sampling delay time of the power grid voltage is, the smaller the delay time of the control system is; and excellent current control performance can be acquired. Thus, by combining advantages and avoiding the disadvantages of two kinds of the feedforward items, the performance of the STATCOM is improved.
Owner:XJ ELECTRIC +2

Position sensorless model predictive control system and method for vehicle permanent magnet synchronous motor

The invention relates to a sensorless model predictive control system and a method of a permanent magnet synchronous motor for vehicles. The system comprises a maximum torque-current ratio controllerfor obtaining a reference value of a stator current; Stator current feedback module: acquiring a stator current feedback value; A position observer module for observing the rotational speed and the rotor position angle of the permanent magnet synchronous motor; A current predictive control module, which performs current predictive control according to the stator current reference value, the statorcurrent feedback value, the speed of the permanent magnet synchronous motor and the rotor position and outputs a stator voltage reference value; A rotating high-frequency voltage injection module that generates a rotating high-frequency voltage signal and superimposes the rotating high-frequency voltage signal and a stator voltage reference value to obtain a control voltage; SVPWM modulation module: SVPWM modulation of the control voltage to obtain inverter control signal, inverter connected to the permanent magnet synchronous motor. Compared with the prior art, the invention not only can realize the optimization of the current control performance, but also can simplify the controller hardware and improve the reliability of the control system.
Owner:TONGJI UNIV

Single-phase rectifier and control method thereof

The invention discloses a single-phase rectifier and a control method thereof. The single-phase rectifier comprises a diode single-phase bridge which is used for rectifying an input alternating current into a direct current and of which the output is connected to the midpoint of a bridge arm of a boost half-bridge, the boost half-bridge which comprises a fast recovery diode and a full-controlled device connected in series and is used for controlling the waveform of the input alternating current to be sinusoidal, a direct-current capacitor which is connected with the boost half-bridge in parallel, and a controller which is used for converting the input alternating current into multi-phase currents with different frequencies, carrying out harmonic control on the multi-phase currents, obtaining a given voltage value through multi-phase coordinate transformation, converting the given voltage value into a control pulse and sending the control pulse to the boost half-bridge. By adopting thescheme provided by the invention, independent suppression of each harmonic wave is realized in a virtual multi-phase mode.
Owner:BEIJING UNIV OF CIVIL ENG & ARCHITECTURE

A current predictive control method for a double-winding induction generator system

The invention discloses a current prediction control method of a dual-winding induction generator system, which relates to the technical field of induction motor drive control. Taking a five-phase dual-winding induction generator system as an object, a PI regulator is used to control the control winding side and the power winding of the induction generator system. The side bus voltage is calculated by using the voltage model rotor flux linkage to obtain the rotor flux linkage amplitude and orientation angle, and the current prediction model of the dual-winding induction generator system is established. By controlling the winding current and the rotor flux linkage amplitude, the current prediction model is calculated In the next control cycle, the predicted value of the control winding current is set to keep up with the given value, and the required control winding voltage is calculated and sent to the space vector pulse width modulation to output the switch signal. The current predictive control method is simple to implement, effectively overcomes the problem of difficult parameter setting in the traditional method, and has better current control performance, thereby improving the dynamic performance of the entire control system.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Angle-type STATCOM based on feedforward control of power grid voltage and control method of angle-type STATCOM

The invention relates to an angle-type STATCOM based on feedforward control of power grid voltage and a control method of the angle-type STATCOM. The control method comprises steps of superposing output quantity of a feedforward controller on the output quantity of a current inner ring, and judging whether the power grid is in a steady state or in a transient state before the STATCOM is unlocked; if the power grid is in the steady state, using a feedforward item based on power grid voltage phase angle compensation as the output quantity of the feedforward controller, and after a control system is stable, switching to take the feedfoward item based on direct acquisition of power grid voltage as the output quantity of the feedforward controller; and if the power grid is in the transient state, using the feedfoward item based on direct acquisition of power grid voltage as the output quantity of the feedforward controller. According to the invention, it can be achieved that the impact current is smallest during unlocking under the condition that the power grid is in the steady state; based on the feedforward item of the power grid voltage, true conditions of the power grid voltage can be well reflected under the condition that the power grid is in the transient state; the smaller the sampling delay time of the power grid voltage is, the smaller the delay time of the control system is; and excellent current control performance can be acquired. Thus, by combining advantages and avoiding the disadvantages of two kinds of the feedforward items, the performance of the STATCOM is improved.
Owner:XJ ELECTRIC +2

A motor model predictive current control method and device, electronic equipment and medium

One or more embodiments of this specification provide a motor model predictive current control method and device, electronic equipment, and media. The method obtains the sector where the reference voltage vector is located by means of fast vector selection, and uses the principle of proximity from non- The optimal voltage vector is selected from the zero voltage vector, and a dead zone is configured for each inverter bridge arm, and the dead zone voltage vector is obtained according to the flow direction of the three-phase current of the motor, which solves the zero vector equivalent of the dead zone voltage vector and the waiting time The impact of the high-amplitude common-mode voltage generated by the zero vector in the selected vector on the life of the motor is optimized, and the duration of the dead-zone voltage vector is used as a variable to optimize the control effect.
Owner:NORTH CHINA UNIVERSITY OF TECHNOLOGY

CBTC (Communication Based Train Control) vehicle-mounted information storage device

The CBTC vehicle-mounted information storage device comprises a heat dissipation structure and a transmission structure, the heat dissipation structure is arranged on the inner side of a protective shell, and a filter screen plate, a flow guide fan and other components are limited through a first mounting side plate and a second mounting side plate correspondingly; according to the heat dissipation device for the PCB, the heat dissipation frame body and the heat dissipation fin plates are arranged, so that airflow is driven to flow through the flow guide fan and is filtered through the filter screen plate, then heat of components such as the PCB is rapidly discharged through the efficient heat conduction effect of the heat dissipation frame body and the heat dissipation fin plates, and the rapid heat dissipation effect of the components such as the PCB can be improved; the front sealing plate and the mounting main plate are mounted and limited through the mounting lug plate and the limiting side plate, then the mounting main plate is limited and positioned through the elastic effect of the limiting elastic plate and the positioning effect of the positioning rod, and the power input constant value of the power plug is controlled through the power switch.
Owner:上海长合信息技术股份有限公司

Doubly-fed wind power converter low-voltage traversing topological structure and control method thereof

The invention discloses a doubly-fed wind power generator low-voltage traversing converter topological structure and a control method thereof. The low-voltage traversing converter topological structure mainly consists of a triangular structure consisting of bidirectional controllable silicon, and a voltage source type back-to-back converter, and is characterized in that: the triangular structure is formed by connecting three pieces of bidirectional controllable silicon and resistors sequentially; and the three peaks of the triangular structure are connected with three alternating-current output points of a doubly-fed motor rotor side converter respectively. Aiming at the capacity requirement on the rotor side converter during low-voltage traversing of the doubly-fed wind power generator, the invention adopts that: the triangular structure consisting of the bidirectional controllable silicon is arranged in the doubly-fed motor rotor side converter; two working modes, namely active bar crowing and cooperative control, are formed due to matched control of the controllable silicon in the triangular structure and a bridge-arm switch of the doubly-fed motor rotor side converter, so thatthe processing capability to the current of a doubly-fed motor rotor; therefore, the low-voltage traversing function of the doubly-fed wind power generator is realized better due to low-cost and high-reliability converter structural variation.
Owner:HEFEI UNIV OF TECH
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