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Field weakening control method and device for single pi current loop during overmodulation

A field-weakening control and over-modulation technology, which is applied in the control of electromechanical transmission devices, motor generator control, AC motor control, etc., can solve the problems of generating large current, high-frequency operation out of step, and affecting the stable operation of permanent magnet synchronous motors. , to achieve the effect of simplifying PMSM control system and stable operation

Active Publication Date: 2019-06-07
GUANGDONG MEIZHI COMPRESSOR
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Problems solved by technology

And when deep field weakening and overmodulation are combined, it may cause problems such as high-frequency operation out of step and high current generation, which seriously affects the stable operation of permanent magnet synchronous motors

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  • Field weakening control method and device for single pi current loop during overmodulation
  • Field weakening control method and device for single pi current loop during overmodulation
  • Field weakening control method and device for single pi current loop during overmodulation

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Embodiment Construction

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0038] The method and device for field weakening control of a single PI current loop when a permanent magnet synchronous motor is overmodulated and the control system for a permanent magnet synchronous motor according to embodiments of the present invention will be described below with reference to the accompanying drawings.

[0039] figure 2 According to an embodiment of the present invention, the invention relates to a field weakening control method of a single PI current loop when a permanent magnet synchronous motor is overm...

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Abstract

The invention discloses a field weakening control method and device for a single PI current ring during over-modulation as well as a control system for a permanent magnet synchronous motor. The method comprises the following steps: obtaining an over-modulation coefficient KH of the permanent magnet synchronous motor, and calculating action time T1 and T2 of two of six basic effective vectors when the permanent magnet synchronous motor performs SVPWM control; judging whether the permanent magnet synchronous motor enters an over-modulation and single PI current ring field weakening control mode or not according to the over-modulation coefficient KH, T1 and T2; if the permanent magnet synchronous motor enters the over-modulation and single PI current ring field weakening control mode, taking output of a speed ring as a D-axis current given value, and performing D-axis PI current ring regulation according to the D-axis current given value and D-axis feedback current to obtain D-axis voltage, and performing field weakening control on the permanent magnet synchronous motor according to Q-axis voltage before the permanent magnet synchronous motor enters the over-modulation and single PI current ring field weakening control mode according to D-axis voltage, thereby ensuring stable operation during over-modulation and field weakening control of the permanent magnet synchronous motor.

Description

technical field [0001] The present invention relates to the field of permanent magnet synchronous motors, in particular to a field weakening control method for a single PI current loop when a permanent magnet synchronous motor is overmodulated, a field weakening control device for a single PI current loop when a permanent magnet synchronous motor is overmodulated, and a A control system for a permanent magnet synchronous motor. Background technique [0002] PMSM (permanent magnet synchronous motor, permanent magnet synchronous motor) control requires a classic three-loop control, that is, a speed loop, D-axis current loop, and Q-axis current loop, such as figure 1 shown. [0003] The voltage equations of the D and Q axes of the permanent magnet synchronous motor are: [0004] [0005] The electromagnetic torque is: [0006] [0007] Among them, T e is the electromagnetic torque of the permanent magnet synchronous motor, P n is the number of pole pairs of the perma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/22H02P27/12
CPCH02P21/0003H02P27/12
Inventor 宋万杰任新杰王世超
Owner GUANGDONG MEIZHI COMPRESSOR
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