Compensation method for parameters (below base speed) of permanent magnet synchronous motor based on feedforward voltage compensation

A permanent magnet synchronous motor and voltage compensation technology, which is applied in the field of rail transit, can solve problems such as large calculation errors and complex calculation formulas, and achieve the effect of reducing calculation errors

Active Publication Date: 2019-12-06
BEIJING JIAOTONG UNIV
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Problems solved by technology

However, this method requires that there must be a speed outer loop in the control. The current amplitude obtained through the adjustment of the speed outer loop can be combined with the calculated stator current angle for d-q axis current synthesis, which is not applicable to the control method with only the torque inner loop. And using the formula to directly calculate in the small torque condition will lead to a large calculation error, and the calculation formula is more complicated

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  • Compensation method for parameters (below base speed) of permanent magnet synchronous motor based on feedforward voltage compensation
  • Compensation method for parameters (below base speed) of permanent magnet synchronous motor based on feedforward voltage compensation
  • Compensation method for parameters (below base speed) of permanent magnet synchronous motor based on feedforward voltage compensation

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[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] Such as figure 2 , 3 As shown, the present invention is based on the compensation method for parameters below the base speed of the permanent magnet synchronous motor based on feedforward voltage compensation. The specific steps are as follows:

[0039] S1. Obtain the DC bus voltage U through the voltage and current sampling circuit dc and three-phase current i a i b i c , the rotor position angle θ is obtained through the resolver decoding circuit;

[0040] Then transform the three-phase current from the three-phase stationary coordinate system to the two-phase synchronous rotating coordinate system to obtain the d-axis current i d and q-axis current i q , the transformation matrix is:

[0041]

[0042]Calculate the motor speed ω from the rotor position angle θ s , the calculation formula is:

[0043]

[0044] S2. The motor control me...

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Abstract

The invention relates to a compensation method for parameters (below base speed) of a permanent magnet synchronous motor based on feedforward voltage compensation. The method comprises the following steps: S1, performing calculation to obtain a d-axis current and a q-axis current; S2, obtaining a d-axis current instruction through the calculation of a torque instruction; S3, obtaining two values shown in the description through a current loop PI regulator; S4, calculating two values shown in the description, and respectively calculating the sums of the two values with the two values in step S3to obtain two new values; S5, inputting the two new values in step S4 into a space vector modulation module to obtain six paths of pulses which act on a voltage type inverter control motor; S6, compensating for the q-axis inductor and the d-axis flux linkage, wherein the compensated q-axis inductance and d-axis flux linkage are used for calculation in step S2 and the step S4 in the next calculation period; and the steps S1-S6 are circulated in a reciprocating manner, that is, the output torque of the motor is accurately controlled through the compensation of motor parameters.

Description

technical field [0001] The invention relates to the field of rail transit, in particular to a method for compensating parameters of a permanent magnet synchronous motor below a base speed based on feedforward voltage compensation in a rail transit traction system. Background technique [0002] Permanent magnet synchronous motors have the advantages of high power density, high power factor, high efficiency, and small size, and are widely used in rail transit traction systems. The main control method of permanent magnet synchronous motor is vector control based on synchronous rotating coordinate system (d-q axis), which is suitable for operating conditions in the full speed range. [0003] The core control object of the permanent magnet synchronous motor is the torque. In order to ensure the accurate issuance of the torque command, accurate motor parameters are required. In order to obtain more accurate motor parameters, the main method currently used is the online parameter ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/16H02P21/14
CPCH02P21/141H02P21/16
Inventor 王琛琛张梓绥周明磊游小杰王剑江龙谢冰若
Owner BEIJING JIAOTONG UNIV
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