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Zero-sequence current suppression method of open-winding permanent magnet motor based on extended virtual three-phase

A technology of zero-sequence current and permanent magnet motors, which is applied in motor generator control, AC motor control, electronic commutation motor control, etc., can solve problems such as insufficient control performance, and achieve enhanced system reliability, precise and stable control, and good performance. The effect of the zero-sequence current suppression effect

Active Publication Date: 2021-02-26
TIANJIN SAIXIANG M&E ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for suppressing the zero-sequence current of an open-winding permanent magnet motor based on extended virtual three-phase. The invention overcomes the disadvantage of insufficient control performance of a traditional linear controller designed in the continuous time domain at low switching frequencies. The control accuracy error caused by the approximate method used in the digital implementation process is eliminated, and the dynamic response and robustness of the control system are improved while realizing the open-winding permanent magnet motor current control and common-mode voltage suppression. See the description below for details:

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  • Zero-sequence current suppression method of open-winding permanent magnet motor based on extended virtual three-phase
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  • Zero-sequence current suppression method of open-winding permanent magnet motor based on extended virtual three-phase

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Embodiment 1

[0047] A zero-sequence current suppression method for open-winding permanent magnet motors based on extended virtual three-phase, see Figure 1-Figure 4 , the method includes the following steps:

[0048] 101: Expand the single-phase zero-sequence current into three-phase AC signals with 120° electrical angle difference between the three phases through virtual three-phase extension; then convert the extended three-phase AC signals into synchronous rotating coordinate system through virtual coordinate transformation dq two-phase DC signal;

[0049] 102: Based on the equivalent open-winding permanent magnet motor model in the discrete domain, and taking into account the time delay brought about by the digital implementation and the space vector pulse width modulation process into the motor model by adding state variables;

[0050] 103: Design dq-axis current controller and zero-sequence current controller in discrete domain to realize precise control of dq-axis current and zero...

Embodiment 3

[0164] Below in conjunction with concrete experiment, the scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0165] Figure 5 The experimental results are verified for the effectiveness of the zero-sequence current controller. The experimental conditions are: the speed of the open winding motor is 300r / m; i d,ref = 0A, i q,ref =5A,i 0,ref =0A; before 0.2s, the zero-sequence current is out of control, and the zero-sequence current controller operates at 0.2s, and then it can be seen from the graph that the zero-sequence current is well suppressed, and the three-phase current becomes normal sinusoidal waveform; at the same time, the dq axis current has been well controlled.

[0166] Those skilled in the art can understand that the accompanying drawing is only a schematic diagram of a preferred embodiment, and the serial numbers of the above-mentioned embodiments of the present invention are for description only,...

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Abstract

The invention discloses a method for suppressing zero-sequence current of an open-winding permanent magnet motor based on extended virtual three-phase. angle three-phase AC signal; then convert the extended three-phase AC signal into a dq two-phase DC signal in the synchronous rotating coordinate system through virtual coordinate transformation; based on the equivalent discrete domain open-winding permanent magnet motor model, and by adding The state variable takes the time delay brought by digital implementation and space vector pulse width modulation into account into the motor model; the dq-axis current controller and the zero-sequence current controller are designed in the discrete domain to realize the control of the dq-axis current and zero sequence current respectively. Precise control of sequence current. The invention eliminates the control precision error caused by using the approximation method in the process of digital realization, and improves the dynamic response and robustness of the control system while realizing the current control and common mode voltage suppression of the open-winding permanent magnet motor.

Description

technical field [0001] The invention relates to the field of motor system and control, in particular to a method for suppressing zero-sequence current of an open-winding permanent magnet motor based on extended virtual three-phase. Background technique [0002] As a new type of motor, the open-winding motor does not change the electromagnetic design and mechanical structure of the original motor, but opens the neutral point of the Y-connected stator winding of the conventional three-phase motor to form an open winding structure with two ports. The open-winding structure motor can not only inherit the basic performance of the traditional motor, but also improve the structure of the motor body to a certain extent because the constraint relationship between the motor windings of each phase no longer exists after the neutral point of the winding is opened, and the windings of each phase are independent. Reliability and fault tolerance of motor drive systems. In addition, the tw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/22H02P25/089
Inventor 宋战锋胡思雨
Owner TIANJIN SAIXIANG M&E ENG CO LTD