Space vector pulse width modulation method for six-phase variable-frequency power source

A technology of space vector pulse width and variable frequency power supply, which is applied in the direction of electrical components, output power conversion devices, AC power input conversion to DC power output, etc. It can solve the increase in the calculation amount of equations and the large amount of calculations in five-element linear equations and other problems, to achieve the effect of suppressing harmonic current and reducing switching loss
CN103227582AActive Publication Date: 2013-07-31HUNAN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN UNIV
Publication Date
2013-07-31

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Abstract

The invention discloses a space vector pulse width modulation method for a six-phase variable-frequency power source, which comprises the following steps 1), a six-phase / two-phase coordinate transformation matrix is used for mapping sixty-four switching states of a six-phase voltage source inverter to a dq sub-plane, a z1z2 sub-plane and an o1o2 sub-plane, and sixty-four fundamental voltage space vectors are obtained, wherein four zero vectors are included in the sixty-four vectors; 2), twelve vectors with the maximum amplitudes in the sixty-four vectors are selected from the dq sub-plane, and twelve new vectors are constructed according to a principle that voltseconds of the z1z2 sub-plane and o1o2 sub-plane are zero; 3), expected vectors are synthesized in the dq sub-plane by using the twelve new vectors and the zero vectors, and the action time of fundamental vectors corresponding to the new vectors is determined; and 4), action sequences of the fundamental vectors corresponding to the new vectors are determined according to a design principle that the switching times of the six-phase voltage source inverter is least and an output voltage waveform is in a 1 / 2 periodically symmetrical state. The method can be applied to modulation of the output voltage waveform of a multi-phase variable-frequency power source; the switching loss of the inverter can be reduced; load harmonic current can be inhibited.
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Description

technical field

[0001] The invention belongs to the field of power electronic system control engineering and relates to a space vector pulse width modulation method for a six-phase variable frequency power supply. Background technique

[0002] The variable frequency power supply is generally three-phase, because the power system is three-phase, and most of the electric loads are also three-phase. With the development of power electronics technology, multi-phase power supply can be realized through power converters. The load of multi-phase power supply is generally multi-phase motor. At present, it is mainly used in high-reliability electrical drive fields such as aerospace, ship propulsion, and electric vehicles. The six-phase frequency conversion power supply is a representative special power supply in the multi-phase power supply. The main circuit is generally an AC-DC, voltage source type, two-level frequency conversion circuit.

[0003] The modulation technology of the ...

Claims

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