14 results about "Direct torque control" patented technology

The application discloses a kind of distributed drive electric vehicle stability control method and system, desired centroid side slip angle and yaw angular velocity are calculated as control target according to vehicle dynamics model, actual centroid side slip angle and yaw angular velocity are estimated in real time by Kalman filtering.Further through stability judging law, vehicle state is identified using phase plane method.According to vehicle state, it is divided into: stable domain, coordination domain and non-stable domain.Further control target value and actual value are input into model reference adaptive controller, and the size of additional yaw moment and front wheel angle is respectively solved.The weight size of the two is calculated by the vehicle stability region determined in stability law.Additional front wheel angle can be directly input into vehicle actuator, if direct torque control is needed, additional yaw moment size needs to be input into torque distribution module for real-time solution, and finally left and right wheel torque value of front axle is output to vehicle actuator.

The invention discloses an icebreaker propulsion control system and method based on self-adaptive power and rotating speed cooperation, and the method comprises the steps: inputting the operation state of an electric propulsion system, and carrying out the dynamic balance adjustment of a working point of a permanent magnet synchronous motor through a self-adaptive operation point cooperation optimization control module; the balance optimization result is evaluated through the operation index evaluation module; after balance adjustment is completed, an operation point anti-interference control module carries out anti-interference control on the dynamic working point, and periodic load disturbance is relieved; after the anti-interference control is completed, the inverter control module controls the inverter through torque direct control and space voltage vector modulation; and outputting an optimized real-time control instruction of the electric propulsion system to realize final adjustment. By the adoption of the method, the flexible adjusting capacity and the operation range of the propelling system are improved, power and speed fluctuation under load torque sudden change is effectively relieved, system efficiency and safety are improved, and a key solution is provided for technical upgrading of polar region shipping equipment.

The invention relates to a sensorless brushless direct current motor direct torque control method based on robust extended Kalman filtering. The method comprises the following steps: acquiring stator voltage and current, and estimating an estimated rotor position, an estimated speed and an estimated electromagnetic torque of a motor through a robust extended Kalman filtering algorithm; determining a voltage space sector where a rotor flux linkage vector is located based on the estimated rotor position and the estimated speed of the motor; determining a target value based on the estimated electromagnetic torque and a reference electromagnetic torque, the target value being used to characterize a magnitude of desired electromagnetic torque adjustment; based on the voltage space sector where the rotor flux linkage vector is located and the target value, a voltage vector corresponding to the motor is obtained, and the voltage vector is used for driving the rotor flux linkage vector to rotate in the needed direction. By adopting the method, accurate control of the motor is realized without adopting a sensor.

The invention provides a self-adaptive speed regulation method based on conveying belts of multiple movable telescopic belt type reversed loader. The load island phenomenon in the collaborative conveying process of a plurality of movable telescopic belt type reversed loaders can be effectively relieved, the resource utilization rate and the operation efficiency of a conveying system are improved, and meanwhile high-precision and quick-response inter-partition dynamic speed regulation is achieved through direct torque control.

This invention discloses an ALK-PEM electrolysis hydrogen production synchronous control method based on direct torque and droop control, implemented using a "DTC-adaptive droop" dual-loop collaborative control architecture, including: real-time acquisition of the total power P input from wind and solar power sources. total The absolute value of the state of charge and power change rate of the hydrogen storage system, |dP / dt|, is used to generate electrolyzer power commands. The electrolyzer includes an alkaline electrolyzer (ALK) and a proton exchange membrane electrolyzer (PEM). An adaptive droop coefficient is dynamically calculated based on the absolute value of the state of charge and power change rate of the hydrogen storage system, |dP / dt|. The electrolyzer power P of the PEM and ALK is allocated accordingly. PEM and P ALK ; P PEM and P ALK The generated instructions are input to the DTC controller, which produces PWM drive signals to drive the PEM and ALK electrolyzers respectively. The corresponding control system and a hydrogen production device including the control system are also disclosed. The hydrogen production device further includes: a PEM electrolyzer unit, an ALK electrolyzer unit, and a wind and solar power interface.

The application discloses a control system of a distributed drive vehicle and a control method thereof, and comprises a whole vehicle integrated brake controller and a motor controller. The whole vehicle integrated brake controller is used for acquiring vehicle state signals, and the vehicle state signals at least include vehicle speed, wheel speed and motor rotating speed. The motor controller is in communication connection with the whole vehicle integrated brake controller, and the motor controller is integrated with a direct torque control module. The application realizes millisecond-level fast response by sinking the slip rate control to the inside of the motor controller through the direct torque control module, and solves the problems of long control period and slow response of the traditional traction control system.

The application discloses a direct torque control method and system considering DC bus voltage imbalance, and relates to the field of motor control. The method comprises the following steps: determining the distribution law of voltage vectors in the fundamental wave alpha-beta subplane and the harmonic x-y subplane when the DC bus voltage is unbalanced; determining three groups of virtual vector groups according to the distribution law and a set condition; the set condition is that the distribution of three basic voltage vectors in the harmonic x-y subplane is greater than 180 degrees, and the three basic voltage vectors are composed of two large vectors and one medium vector in the fundamental wave alpha-beta subplane; obtaining the optimal virtual vector based on the three groups of virtual vector groups according to the DC bus voltage ratio, the sector K value, the system torque and the flux demand; sorting the switches in two two-level three-phase voltage source inverters according to the action time of the three basic vectors in a control period, obtaining the optimized switch sorting, and then controlling the voltage source inverters. The application can efficiently operate under the DC bus voltage imbalance.

The invention relates to a long-distance belt conveyor control system for TBM construction, and belongs to the technical field of long-distance belt conveyor control for TBM construction. In order to solve the technical problem that a long-distance belt conveyor is easily influenced by load fluctuation in TBM construction, the technical scheme adopted by the invention is characterized in that a load detection unit and a speed detection unit are arranged; the central controller is connected with a load detection unit, a speed detection unit and a driving unit comprising a frequency converter and a driving motor, takes 50ms-200ms as a sampling and control period, is internally provided with a model prediction control algorithm, and outputs target torque and rotating speed in a rolling optimization manner by taking energy consumption minimization as a target under the constraint of absolute values of speed and acceleration; the frequency converter adopts vector or direct torque to control the driving motor to operate. The system is mainly used for deslagging transportation control of a long-distance belt conveyor in TBM construction, and efficient and stable operation is achieved.

This specification relates to the field of permanent magnet synchronous motor control technology and provides a deadbeat direct torque control method, device, system, and storage medium. The method includes: obtaining the input voltage and stator current of the permanent magnet synchronous motor in the current control cycle; predicting the stator current of the permanent magnet synchronous motor in the next control cycle based on the input voltage and stator current; determining the electromagnetic torque and reactive torque of the permanent magnet synchronous motor in the next control cycle based on the stator current of the permanent magnet synchronous motor in the next control cycle; determining the control voltage of the permanent magnet synchronous motor in the next control cycle based on the electromagnetic torque, reactive torque, and a set of torque difference equations with the control voltage as an unknown quantity; and driving the permanent magnet synchronous motor based on the control voltage. This specification can achieve rapid electromagnetic torque response in a permanent magnet synchronous motor torque control system.

The invention discloses an ALK-PEM electrolytic hydrogen production synchronous control method based on direct torque and droop control, which is realized based on a 'DTC-adaptive droop' double-loop cooperative control architecture, and comprises the following steps: collecting the total power Ptotal input by a wind and light power supply, the charge state of a hydrogen storage system and the absolute value | dP / dt | of the power change rate in real time; a direct torque control algorithm is adopted to generate an electrolytic cell power instruction, and electrolytic cells comprise an alkaline electrolytic cell ALK and a proton exchange membrane electrolytic cell PEM; dynamically calculating an adaptive droop coefficient based on the state of charge of the hydrogen storage system and the absolute value | dP / dt | of the power change rate; distributing electrolytic cell power PPEM and PALK of a proton exchange membrane electrolytic cell PEM and an alkaline electrolytic cell ALK; and instructions formed by the PPEM and the PALK are input into a DTC controller, and PWM driving signals for driving the PEM electrolytic cell and the ALK electrolytic cell respectively are generated. The invention further discloses a corresponding control system and hydrogen production equipment comprising the control system. The hydrogen production equipment further comprises a PEM electrolytic cell unit, an ALK electrolytic cell unit and a wind-solar power interface.

The application relates to a long-distance belt conveyor control system for TBM construction and belongs to the technical field of long-distance belt conveyor control in TBM construction. In view of the technical problem that the long-distance belt conveyor in TBM construction is easily affected by load fluctuation, the technical solution points of the application are as follows: a load detection unit and a speed detection unit are arranged; a central controller is connected with the load detection unit, the speed detection unit and a driving unit containing a frequency converter and a driving motor, a sampling and control cycle of 50ms-200ms is adopted, a model prediction control algorithm is built-in, target torque and speed are output by rolling optimization under the constraints of speed and acceleration absolute values, and the frequency converter adopts vector or direct torque control to drive the motor to operate. The system is mainly used for slag transportation control of the long-distance belt conveyor in TBM construction and realizes efficient and stable operation.

The invention relates to the technical field of industrial frequency converters, and discloses a motor driver power-down synchronization method, which comprises the following steps: acquiring bus voltage of a system and motor rotating speed estimated by each motor driver; according to the bus voltage of the system, generating a total power generation torque adjusting quantity required by the lowest bus voltage capable of maintaining the work of the system in real time; calculating the power generation weight of each motor in real time according to the estimated rotating speed of each motor driver; and respectively combining the total power generation torque adjusting quantity with the power generation weight of each motor to calculate the power generation torque adjusting quantity required by each motor. The method does not need to depend on a motor position sensor or a motor rotating speed sensor, and can be directly integrated into various position-sensorless motor control strategies such as field-oriented control and direct torque control.

The application relates to the technical field of engineering vehicle control, and discloses a remote control type high-speed aerial platform truck driving energy management system and a control method. The system comprises a vehicle controller, front / rear axle driving motors, a battery management system and a remote controller. The vehicle controller directly maps a remote control rocker travel into driving or braking demand torque, realizing direct torque control. The system receives allowable charging and discharging currents and voltages of the BMS in real time, converts the currents and voltages into dynamic torque limit values based on the law of conservation of energy, and combines one-dimensional interpolation table lookup of high and low speed gears to correct power. When braking, a two-dimensional mapping model of vehicle speed and braking depth is used to give feedback torque. The application solves the problems of response lag of traditional speed loop control and inaccuracy of high-speed operation, guarantees battery safety, and significantly improves energy recovery efficiency and driving stability.