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Zero-sequence current pi control method with 2 degrees of freedom for open-winding permanent magnet motors

A permanent magnet motor, zero sequence current technology, applied in motor generator control, AC motor control, electronic commutation motor control and other directions, can solve the problems of complex parameter setting and structure of PR controller, and achieve simplified structure and parameters. Tuning process, overcoming the complex effects of parameter tuning

Active Publication Date: 2019-12-17
TIANJIN SAIXIANG M&E ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a two-degree-of-freedom PI control method for the zero-sequence current of a permanent magnet motor. Due to the complex structure of the analog voltage compensation method, a new type of controller with simpler and more reliable parameter setting is proposed. See the description below for details:

Method used

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  • Zero-sequence current pi control method with 2 degrees of freedom for open-winding permanent magnet motors
  • Zero-sequence current pi control method with 2 degrees of freedom for open-winding permanent magnet motors
  • Zero-sequence current pi control method with 2 degrees of freedom for open-winding permanent magnet motors

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Embodiment 1

[0029] The embodiment of the present invention provides a common DC bus type open-winding permanent magnet motor control system, the control system adopts three closed-loop control, that is, the speed outer loop, the current inner loop, and the zero-sequence current control loop. The three control loops all adopt 2-DOF PI (2-DOF PI) controllers, and the speed outer loop and current inner loop are designed and adjusted by referring to existing literature, which is not explained in this patent. The zero-sequence current control loop is the core of the embodiments of the present invention, which will be described in detail in the embodiments of the present invention.

[0030] When only considering the third back EMF in the motor, the zero-sequence current in the motor mainly contains the third harmonic. In the embodiment of the present invention, after the zero-sequence current is obtained, the sampled zero-sequence current is respectively delayed by 120° after a certain time del...

Embodiment 2

[0035] Combine below Figure 1-Figure 3 , and the specific calculation formula further introduces the scheme in embodiment 1, see the following description for details:

[0036] figure 1 Shown is the zero-sequence current 2-DOF PI control structure diagram of the open-winding permanent magnet motor, and the speed outer loop and current inner loop are both controlled by 2-DOF PI. The design and parameter setting methods of the speed outer loop and the current inner loop refer to the traditional motor closed-loop control design method, and a large number of documents have explained this in detail, and the embodiments of the present invention will not repeat it here. The following focuses on the design of the zero-sequence loop controller:

[0037] When power is supplied by dual converters, the common-mode voltages output by the two converters are respectively u 01 , u 02 , then the common-mode voltage u applied to the motor 0 for:

[0038]u 0 = u 01 -u 02 (1)

[0039]...

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Abstract

The invention discloses an open-winding permanent magnet motor zero-sequence current 2-degree-of-freedom PI control method. A zero-axis single-phase alternating current loop is expanded into a virtual three-phase alternating current loop system through delay, and is transformed to a dq coordinate system, and conversion of alternating quantity to direct current quantity is realized. A feedback controller adopts a 2-degree-of-freedom PI controller, and the only controller parameter is controller bandwidth. The open-winding permanent magnet motor zero-sequence current 2-degree-of-freedom PI control method provided by the invention overcomes the deficiencies that in traditional open-winding permanent magnet motor zero-sequence current feedback control, parameter setting of a PR controller is complicated and in adoption of a common-mode voltage compensating method based on a phase-locked loop, the structure is complicated, and proposes a novel controller which is simpler and more reliable in parameter setting.

Description

technical field [0001] The invention relates to the field of motor system and control, in particular to a zero-sequence current control method of an open-winding permanent magnet motor. Background technique [0002] The open-winding motor is to open the neutral point of the traditional three-phase AC motor to form an open winding structure with two ports. There is no change in the magnetic circuit and structure of the motor, and the open-winding structure motor does not change the basic performance of the traditional motor, and since the constraint relationship between the motor windings of each phase no longer exists after the neutral point is opened, the windings of each phase are independent, and can be used in a certain To a certain extent, the reliability of the motor body and the fault tolerance of the motor drive system are improved. The two ports of the open-winding motor can be connected to the converter respectively. Through the coordinated control of the converte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/22H02P25/02
CPCH02P21/0003H02P21/22H02P25/02
Inventor 宋战锋张志朋
Owner TIANJIN SAIXIANG M&E ENG CO LTD
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