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Oscillation suppression method, system, device and readable storage medium

A technology of oscillation component and instantaneous oscillation, which is applied in the fields of devices, readable storage media, systems, and oscillation suppression methods, and can solve problems such as poor vibration suppression effect of permanent magnet synchronous motors

Active Publication Date: 2020-02-04
SHENZHEN INVT ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has good parameter consistency for induction motors, but poor oscillation suppression for permanent magnet synchronous motors

Method used

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  • Oscillation suppression method, system, device and readable storage medium
  • Oscillation suppression method, system, device and readable storage medium
  • Oscillation suppression method, system, device and readable storage medium

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Embodiment Construction

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0055] The embodiment of the present invention discloses an oscillation suppression method, which is applied when the frequency converter drives the motor in VVVF mode, see figure 1 shown, including the following steps:

[0056] Step S1: Obtain the instantaneous active current i_q and instantaneous reactive current i_d of the motor;

[0057] Among them, the motors here include induction motors and permanent magnet synchronous motors.

[0058] Generally, quad...

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Abstract

The invention discloses an oscillation suppression method. The oscillation suppression method is used when a frequency converter drives a motor in a VVVF (variable voltage and variable frequency) modeand comprises the following steps: acquiring instantaneous active current and instantaneous reactive current of the motor; obtaining an instantaneous active oscillation component through the instantaneous active current and obtaining an instantaneous reactive oscillation component through the instantaneous reactive current; adding the instantaneous active oscillation component and the instantaneous reactive oscillation component to obtain an instantaneous oscillation component; obtaining oscillation suppression compensation frequency through the instantaneous oscillation component; modulatinga power supply circuit of the motor by means of the oscillation suppression compensation frequency. With adoption of the method, current oscillation probably generated under VVVF open-loop control issuppressed, the method is applicable to both an induction motor and a permanent magnet synchronous motor, parameter consistency is better, and full-band oscillation suppression can be realized. All that is needed is to add a simple software module to the original control system, and hardware cost is not increased. The invention further discloses an oscillation suppression system and device as well as a readable storage medium.

Description

technical field [0001] The invention relates to the field of motor drive and frequency conversion speed regulation, in particular to an oscillation suppression method, system, device and readable storage medium. Background technique [0002] VVVF (Variable Voltage and Variable Frequency, variable voltage and variable frequency) control mode is a control method widely used in inverters. Its advantage is that it can adapt to most applications without depending on the motor parameters; the disadvantage is that Powered by an inverter, this control mode will cause the motor to oscillate in certain frequency bands, and in severe cases, trip protection will occur. This current oscillation is related to the dead time, the damping strength of the motor winding, and the load change. For permanent magnet synchronous motors, the torque fluctuation caused by this oscillation can easily cause out of step. The continuous oscillation of the current limits the application range of the VVVF...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/05H02P21/22H02P27/08
CPCH02P21/05H02P21/22H02P27/085
Inventor 刘军锋王二峰曾川
Owner SHENZHEN INVT ELECTRIC
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