Vector control method based on counter potential feedforward control
A vector control, feedforward control technology, applied in vector control systems, motor generator control, control of electromechanical brakes, etc., can solve problems such as low control accuracy, oversaturation of current or voltage, and easy torque pulsation. High precision and wide application range
Inactive Publication Date: 2012-12-26
XIANGTAN ELECTRIC MFG CORP LTD
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Problems solved by technology
In addition, the constant voltage area of the traction motor usually adopts square wave modulation. If the traditional vector control method is used, the current or voltage will be oversaturated, the torque will easily pulsate, and the control accuracy will be low.
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[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0023] This embodiment includes the following steps:
[0024] (1) Obtain the V / F ratio of the motor through the characteristic curve of the asynchronous traction motor, and obtain the required amplitude of the back EMF of the asynchronous traction motor according to the product of the inverter output frequency and the V / F ratio;
[0025] (2) Given excitation current and torque current;
[0026] (3) The phase angle of the back EMF of the asynchronous traction motor is obtained by the integral of the inverter output frequency;
[0027] (4) Obtain the three-phase stator current of the asynchronous traction motor by sampling the current sensor, and calculate the amplitude and phase angle of the stator current vector of the asynchronous traction motor;
[0028] (5) The amplitude and phase angle of the compensation voltage vector of the current on the stator ...
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The invention relates to a vector control method based on counter potential feedforward control, comprising the following steps: the V / F ratio of a motor is solved to obtain the needed counter potential amplitude of an asynchronous traction motor; exciting current and torque current are given; a counter potential phase angle is obtained by output frequency integral of an inverter; sampling is carried out to obtain the current of a three-phase stator of the motor, and the stator current vector amplitude and the phase angle are calculated; the offset voltage vector amplitude for stator impedance and the phase angle are solved; the stator current vector is decoupled into the torque current and the exciting current; the decoupled exciting current and the given exciting current form a PI(proportional-integral) regulator, and the output of the PI regulator is the counter potential amplitude regulated value; the decoupled torque current and the given torque current form a PI regulator, and the output of the PI regulator controls the slip of the motor directly; and the stator voltage amplitude output by the inverter is the sum of the regulated values of the counter potential amplitude of the motor, the offset voltage vector and the counter potential amplitude. In the invention, the control precision is high and the application range is wide.
Description
technical field [0001] The invention relates to a vector control method of an asynchronous traction motor, in particular to a vector control method based on back-EMF feedforward control. Background technique [0002] Since the dynamic mathematical model of the asynchronous traction motor is a high-order, nonlinear and strongly coupled multivariable system, how to control the asynchronous traction motor accurately has always been a concern. In the 1970s, Siemens engineer F. Blaschke first proposed the use of asynchronous motor vector control theory to solve the control problem of AC motor torque. The basic principle of vector control is to measure the stator current vector of the asynchronous motor, and decompose the stator current vector of the asynchronous motor into the current component that generates the magnetic field (called the excitation current) and the current component that generates the torque (called the current component) according to the vector transformation ...
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IPC IPC(8): H02P21/14H02P27/12H02P21/22
Inventor 杨北辉陈鸿蔚黄兴吴能峰黄洁萍
Owner XIANGTAN ELECTRIC MFG CORP LTD