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A Current Predictive Control Method of Open-winding Permanent Magnet Motor Based on Virtual Vector

A control method and current prediction technology, applied in vector control systems, motor generator control, AC motor control, etc., can solve the problems of design difficulties, unstable switching frequency, inability to completely eliminate common mode voltage, etc., to enhance the reliability of the system stability, stable switching frequency, and the effect of simplifying the system structure

Active Publication Date: 2019-02-01
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 traditional predictive control is to suppress the common-mode voltage in the open-winding permanent magnet motor drive system by adding the common-mode voltage suppression term in the evaluation function, but this method is only a soft constraint and cannot completely eliminate the common-mode voltage, and in this method The switching frequency is not fixed, which also brings some difficulties to the design of the system

Method used

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  • A Current Predictive Control Method of Open-winding Permanent Magnet Motor Based on Virtual Vector
  • A Current Predictive Control Method of Open-winding Permanent Magnet Motor Based on Virtual Vector
  • A Current Predictive Control Method of Open-winding Permanent Magnet Motor Based on Virtual Vector

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Embodiment 1

[0045] A current predictive control method for open-winding permanent magnet motors based on virtual vector, see figure 1 , the method includes the following steps:

[0046] 101: In order to eliminate the common-mode voltage, discard the switch combination containing the common-mode voltage and some zero-vector switch combinations, and obtain the voltage vector without the common-mode voltage;

[0047] Through the above steps, a total of 20 switch combinations without common mode voltage are screened out. The 20 switch combinations are divided into 2 groups, each group corresponds to 6 effective vectors and 1 zero vector. The 6 effective vectors and 1 zero vector as 7 intrinsic vectors.

[0048] 102: Use the screened voltage vector without common mode voltage to synthesize 6 virtual vectors whose amplitude varies with the load and whose direction is the same as the effective vector; the switching function is composed of 7 intrinsic vectors and 6 virtual vectors; the switching...

Embodiment 2

[0058] The following is combined with the specific calculation formula, Table 1-Table 3, Figure 2-Figure 5 The scheme in embodiment 1 is further introduced, see the following description for details:

[0059] Table 1 Synthesized space voltage vector u under different switch combinations for dual-converter power supply s and its common mode voltage amplitude

[0060]

[0061]

[0062] from Table 1 and image 3 It can be seen that the voltage vector corresponds to a variety of switch combinations when the dual-converter is powered, and the switch combinations have redundancy. The inherent vectors without common mode voltage are divided into 2 groups:

[0063] The first group: 1 zero vector [88'(1 1 1 1 1 1)]; 6 non-zero vectors [24'(1 1 0 0 1 1)], [26'(1 1 0 1 0 1) ],[46′(0 1 1 1 0 1)],[42′(0 1 1 1 1 0)],[62′(1 0 1 1 1 0)],[64′(1 0 1 0 1 1)].

[0064] The second group: 1 zero vector [77'(0 0 0 0 0 0)]; 6 non-zero vectors [15'(1 0 0 0 0 1)], [35'(0 1 0 0 0 1) ],[31′...

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Abstract

The invention discloses a virtual vector-based current forecast control method of open-winding permanent-magnet motor. The virtual vector-based current forecast control method comprises the steps of removing a switch combination containing a common-mode voltage and a part of zero vector switch combinations, and acquiring a voltage vector which does not contain the common-mode voltage; synthesizing six virtual vectors of which amplitudes change with a load and directions and effective vectors are same by the screened voltage vector which does not contain the common-mode voltage; combining seven inherent vectors and the six virtual vectors to form a switch function; obtaining the switch combination by virtual vector modulation step on the switch function; acquiring evaluation functions of the switch function only comprising current error items, and selecting optimal switch function according to thirteen evaluation function values; and generating a signal to be acted on a system after external virtual vector modulation is performed on the optimal switch function so that the simultaneous and stable switch frequency on current control can be achieved. By the virtual vector-based current forecast control method, the defects that the switch frequency in forecast control of a traditional open-winding permanent-magnet motor is not stable and the common-voltage voltage suppression effect is needed to be improved are overcome.

Description

technical field [0001] The invention relates to the field of motor systems and control, in particular to a current prediction control method of an open-winding permanent magnet motor based on a virtual vector. Background technique [0002] The open-winding motor is to open the neutral point of the traditional three-phase motor to form an open-winding structure with two ports. The magnetic circuit and structure of the motor are not changed. The open-winding structure motor does not change the basic performance of the traditional motor, and due to the neutral After the point is opened, the constraint relationship between the motor windings of each phase no longer exists, and the windings of each phase are independent, which can improve the reliability of the motor body and the fault tolerance of the motor drive system to a certain extent. The two ports of the motor are respectively connected to the converters, and the power can be distributed to the two converters through the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/22H02P25/092
Inventor 宋战锋张志朋陈炜
Owner TIANJIN SAIXIANG M&E ENG CO LTD
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