A svpwm modulation method for reducing the common-mode voltage of the inverter AC side

A modulation method and common-mode voltage technology, which are applied in the direction of converting AC power input to DC power output, electrical components, and output power conversion devices, etc. The effect of mode voltage

Active Publication Date: 2021-01-19
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the defects of the prior art, the object of the present invention is to provide a SVPWM modulation method for reducing the common-mode voltage of the inverter AC side, aiming at solving the problem of the existing method for reducing the common-mode voltage of the inverter AC side when switching between different switch states. The problem of high number of switch actions

Method used

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  • A svpwm modulation method for reducing the common-mode voltage of the inverter AC side
  • A svpwm modulation method for reducing the common-mode voltage of the inverter AC side
  • A svpwm modulation method for reducing the common-mode voltage of the inverter AC side

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Embodiment

[0075] (1) According to the reference voltage vector V α , V β judging the sector where the reference voltage vector is located, and selecting a non-zero effective vector x and a non-zero effective vector y in the sector for synthesizing the reference voltage vector;

[0076] (2) In each sector, select according to the counterclockwise direction, and the adjacent two non-zero effective vectors are non-zero effective vectors x, y; for example, in the I sector, the non-zero effective vector x is V 4 (100), non-zero effective vector y is V 6 (110);

[0077] (3) After selecting non-zero effective vector x and non-zero effective vector y, calculate the action time of non-zero effective vector Table 2 shows the action time of non-zero effective vectors in the six sectors.

[0078] Table 2

[0079]

[0080] Among them, the values ​​of X, Y, and Z are respectively:

[0081]

[0082]

[0083]

[0084] V α , V β are the components of the reference voltage vector on ...

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Abstract

The invention discloses a SVPWM modulation method for reducing the common-mode voltage of the AC side of the inverter, belonging to the field of power electronics, including: judging the sector where the reference voltage vector is located at a random moment, and selecting a non-zero effective vector counterclockwise in the sector x, y; based on the above sector, select the non-zero effective vector x and y of each sector counterclockwise; calculate the action time of each sector’s non-zero effective vector x and non-zero effective vector y; the equivalent zero The two non-zero effective vectors of the vector are symmetrically inserted into the head, tail and middle of the sampling period to obtain the action sequence of the SVPWM vector; according to the action sequence of the SVPWM vector and the action time of the non-zero effective vector x of each sector, the non-zero effective vector y The time table of the three-phase switch in each sector is obtained; the invention not only reduces the common-mode voltage of the AC side of the inverter, but also reduces the switching times when switching between different switching states.

Description

technical field [0001] The invention belongs to the field of power electronics, and more specifically relates to a SVPWM modulation method for reducing the common-mode voltage of an inverter AC side. Background technique [0002] The common-mode voltage is the zero-sequence component in the output voltage of the voltage source PWM inverter, while the positive-sequence component and negative-sequence component are the effective parts of the output voltage current. At present, the researches on the causes, hazards and harmonic components of differential mode voltage have been sufficient. Since the amplitude of common mode voltage is relatively small, its hazards are easily overlooked. In recent years, with the development of power electronic devices towards high voltage, large capacity, high switching frequency and high power density, the harm of common mode voltage has become increasingly prominent. Common-mode voltage suppression methods can be divided into active suppressi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5395H02M7/5387H02M1/12
CPCH02M1/12H02M7/53871H02M7/5395H02M1/123
Inventor 孔武斌高学鹏曲荣海
Owner HUAZHONG UNIV OF SCI & TECH
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