Space Vector Modulation Method for Suppressing the Common-mode Voltage of Double-y-shifted 30-degree Six-Phase Motor

A technology of space vector modulation and common-mode voltage, which is applied in the direction of electrical components, control systems, motor control, etc., can solve problems such as difficult to effectively suppress common-mode voltage, achieve increased hardware costs, unchanged electromagnetic torque and speed performance, The effect of suppressing the common-mode voltage

Active Publication Date: 2018-08-21
HUNAN UNIV
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Problems solved by technology

From the point of view of the common mode voltage output, the worst case is switching from an odd zero vector to an even zero vector, which will produce a positive peak as U d / 2, the negative peak value is -U d / 2, the peak-to-peak value is U d (U d is the common-mode voltage of the inverter DC bus voltage), it is difficult to effectively suppress the common-mode voltage of the double Y-shifted 30-degree six-phase motor

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  • Space Vector Modulation Method for Suppressing the Common-mode Voltage of Double-y-shifted 30-degree Six-Phase Motor
  • Space Vector Modulation Method for Suppressing the Common-mode Voltage of Double-y-shifted 30-degree Six-Phase Motor
  • Space Vector Modulation Method for Suppressing the Common-mode Voltage of Double-y-shifted 30-degree Six-Phase Motor

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Embodiment Construction

[0046] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0047] refer to figure 1 , this embodiment includes the following steps:

[0048] (1) Generate 64 basic vectors;

[0049] (2) Construct 12 intermediate vectors;

[0050] (3) Calculate the action time of 8 basic vectors;

[0051] (4) Design the action sequence of 8 basic vectors.

[0052] In step (1), the process of generating 64 basic vectors is as follows:

[0053] Coordinate transformation matrix of six-phase motor with double Y shift of 30 degrees

[0054]

[0055] The 64 switching states of the voltage-type two-level inverter are transformed into three mutually perpendicular planes, which are called the fundamental wave plane, the third harmonic plane, and the fifth harmonic plane, respectively, and 64 fundamental vectors are obtained. refer to figure 2 And Figure 3, the vector numbers in the figure are represented by dec...

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Abstract

The invention relates to a space vector modulation method capable of suppressing the common-mode voltage of a dual-Y shift 30-degree six-phase motor. The method includes the following steps that: (1) 64 basic vectors are generated; (2) 12 intermediate vectors are constructed; (3) the action time of 8 basic vectors is calculated; and (4) the action sequence of the 8 basic vectors is designed. With the space vector modulation method of the invention adopted, the common-mode voltage of the dual-Y shift 30-degree six-phase motor can be effectively suppressed, and the current response, magnetic flux linkage track, electromagnetic torque and rotation speed performance of the motor is unchanged.

Description

technical field [0001] The invention relates to the field of power electronics and electric drive, in particular to a space vector modulation method for suppressing the common mode voltage of a six-phase motor with a double Y shift of 30 degrees. Background technique [0002] When the motor is powered by a PWM (pulse width modulation) inverter, a common-mode voltage (CMV) will be generated, which can be measured by the voltage between the common point of the star winding of the motor stator and the midpoint of the inverter's DC bus. . The common mode voltage will bring adverse effects such as leakage current, winding insulation deterioration, shaft voltage, electromagnetic interference, etc. to the motor drive device. Therefore, it is necessary to provide a method for suppressing the common mode voltage in engineering practice. The existing methods for suppressing common mode voltage mainly focus on changing the motor structure, inverter structure or improving modulation al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/12H02P29/00
CPCH02P27/12H02P29/00
Inventor 何怡刚郑剑罗旗舞于文新吴先明谭阳红刘慧
Owner HUNAN UNIV
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