Asynchronous traction motor stator resistance online detection method
A technology of stator resistance and traction motor, applied in the control of generator, motor control, motor-generator control, etc., can solve the problems of affecting the control process, time-consuming and other problems, and achieve the guarantee of accuracy, simple calculation, and improved accuracy. Effect
Active Publication Date: 2020-03-10
XIANGTAN ELECTRIC MFG CORP LTD
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In the practical operation of this method, the input of the initial parameters is very important. If the deviation is too large, it will take a long time for the adaptive calculation process to reach a stable equilibrium state. In addition, the selection of the reference model and the adaptive model is also very critical. affect the entire control process
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[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0025] Such as figure 1 As shown, an online detection method for the stator resistance of an asynchronous traction motor includes the following steps:
[0026] 1) First, the traction converter outputs high-frequency three-phase alternating current to the asynchronous motor end for 10 cycles.
[0027] The output fixed frequency of the traction converter is F, and the excitation current is i sd * , the torque current is i sq * The three-phase alternating current to the asynchronous motor end, the output U, V, W three-phase sinusoids are equal in magnitude, the phase difference is 120 degrees, and the output is 10 cycles, where F is 4-6 times the rated frequency fr of the asynchronous motor, i sd * 0.2-0.4 times of the rated current Ir of the asynchronous motor, i sq * is 0. Since the frequency F of the output three-phase alternating current is ve...
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The invention discloses an asynchronous traction motor stator resistance online detection method. The method comprises the following steps of outputting high-frequency three-phase alternating currentto an asynchronous motor end; calculating total power; calculating a square of a total current; calculating Rsd, and calculating an initial value of a stator resistance self-adaptive model; calculating a voltage type rotor flux linkage, and calculating a current type rotor flux linkage; using a difference value of the voltage type rotor flux linkage and the current type rotor flux linkage as inputof a reference adaptive model; taking the voltage type rotor flux linkage as an adjustable model, and taking the current type rotor flux linkage as a reference model; and after the adaptive model outputs a stator resistance value, feeding back to the adjustable model to update the resistance value, and then carrying out calculation. The adjustable model continuously tracks the reference model ina whole process till that a deviation between the voltage type rotor flux linkage and the current type rotor flux linkage tends to zero, and the calculated stator resistance is used as an accurate true value at the moment. In the invention, the self-adaptive reference model is adopted to test the stator resistance value on line, and the calculated result is updated to a vector control or direct torque control algorithm in real time so that accurate output of a motor control strategy can be effectively ensured.
Description
technical field [0001] The invention relates to the field of motor control, in particular to an online detection method for the stator resistance of an asynchronous traction motor. Background technique [0002] In the control process of asynchronous traction motor, the parameters of the motor have a great influence on the performance of the control system, especially the stator resistance of the motor, which is affected by factors such as temperature and has characteristics of uncertainty and nonlinearity. However, in the control strategy of asynchronous traction motors, whether vector control or direct torque control and other control algorithms are used, the stator resistance of the motor needs to be introduced into the calculation. If there is a large deviation in the motor parameters, the control performance of the asynchronous traction motor will be greatly reduced. , and even affect the function and stability of the entire electric transmission system. Therefore, it i...
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IPC IPC(8): H02P21/16
CPCH02P2207/01H02P21/16
Inventor 张静萌陈鸿蔚周志华曾志超
Owner XIANGTAN ELECTRIC MFG CORP LTD