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AC motor driver DC bus ripple voltage prediction and compensation method and device

A technology of DC bus voltage and ripple voltage, which is applied in the direction of AC motor control, output power conversion device, irreversible DC power input conversion to AC power output, etc., can solve the problems of large difference and avoid distortion, Solve the time delay and reduce the effect of output harmonic content

Active Publication Date: 2018-08-24
天索(苏州)控制技术有限公司
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  • Application Information

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Problems solved by technology

[0005] like figure 2 and image 3 As shown, the sampling voltage value (shown in voltage value point 1) used in modulation calculation and the DC bus voltage value after one carrier cycle (shown in voltage value point 2) may differ greatly

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  • AC motor driver DC bus ripple voltage prediction and compensation method and device
  • AC motor driver DC bus ripple voltage prediction and compensation method and device
  • AC motor driver DC bus ripple voltage prediction and compensation method and device

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Embodiment Construction

[0061] The present invention will be described in detail below in conjunction with specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and structural, method, or functional changes made by those skilled in the art according to these embodiments are included within the protection scope of the present invention.

[0062] The invention discloses a method for predicting and compensating the DC bus ripple voltage of an AC motor driver, which includes the following steps:

[0063] S1, PWM overload interrupt step;

[0064] S2. Calculation and processing steps of the voltage prediction value Vdc;

[0065] S3, the current control step, execute the motor control algorithm, obtain the flux linkage control voltage component and torque control voltage component according to the flux linkage oriented vector control, and obtain the Ualpha voltage under the alpha axis and beta axis in the stator voltage reference coord...

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Abstract

The present invention provides a method and device for predicting and compensating DC bus ripple voltage of an AC motor driver, using the predicted value of DC bus voltage, performing voltage compensation calculation through a ripple voltage compensation algorithm, and obtaining Ualpha* and Ualpha* required by the SVPWM space vector modulation algorithm Ubeta*, then execute the SVPWM space vector modulation algorithm, set the PWM buffer register, update the flag, and the CPU will automatically load the new value and output the PWM waveform in the next reload cycle. The present invention solves the problem of time delay in the implementation of the DC bus voltage sampling and compensation method in the prior art, performs precise compensation control on the DC bus ripple voltage, and avoids the distortion of the pulse width modulation output of the driver as much as possible, and the distortion of the output voltage and current waveform , reduce the output harmonic content and improve the driving performance of the driver.

Description

technical field [0001] The present invention relates to the technical field of motor drivers, in particular to a method and device for predicting and compensating ripple voltage of a DC bus of an AC motor driver. Background technique [0002] For motor drives, the amplitude modulation of the inverter output PWM pulses by the DC bus ripple will cause distortion of the pulse width modulation. The DC bus ripple mainly comes from two reasons: 1. The pulsating DC generated by single-phase or three-phase AC through full-bridge rectification contains low-frequency ripples twice or six times the frequency of the input AC; 2. The DC bus When the DC input power and AC output power of the capacitor cannot be matched in real time, that is, when the inverter voltage is near the zero-crossing point, the instantaneous output power of the AC side is much smaller than the input power of the DC side, so the ripple voltage is at the peak position; when the inverter When the voltage is near th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02P27/08
CPCH02M7/48H02P27/085H02M1/0025
Inventor 朱利东吴冰程军陈峰
Owner 天索(苏州)控制技术有限公司
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