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Three-dimensional space vector modulation algorithm of multi-level inverter

A multi-level inverter, three-dimensional space technology, applied in electrical components, AC power input into DC power output, output power conversion devices, etc., can solve the impact of inverter output performance, increase in redundancy, Complex problems, to achieve the effect of simplifying the SVPWM algorithm, low switching frequency, and improving the response speed

Active Publication Date: 2015-03-25
NANCHANG INST OF TECH
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Problems solved by technology

[0003] The traditional space vector modulation algorithm first samples the reference voltage, then calculates the three nearest basic vectors of the sampled reference voltage vector, and uses the volt-second balance principle to calculate the action time of the three nearest basic vectors, and uses the three basic vectors to synthesize the reference Vector, this kind of algorithm usually involves trigonometric function operations, and the calculation workload is heavy
[0004] On the other hand, with the increase of the number of levels in the traditional space vector modulation algorithm, the redundancy of the switch state vector corresponding to a basic vector will increase greatly, and it is a complicated task to find the appropriate switch state vector corresponding to the basic vector , and different switch state vectors will have a great impact on the output performance of the inverter

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Embodiment Construction

[0033]Taking the seven-level inverter as an example, the phase a, phase b, and phase c of the switch state vector are respectively mapped to the A, B, and C coordinates of the ABC coordinate system, and the switch state vector of the seven-level inverter is obtained Distributed on the integer coordinate points in a cube with a side length of 6 centered on the origin of the coordinates, as shown in the attached figure 2 shown. Similarly, the reference vector V r (a r , b r , c r ) is mapped to the ABC coordinate system. on the reference vector V r (a r , b r , c r ) Each phase component is rounded to get V 1 (a, b, c), V 1 is the distance reference vector V r The nearest basis vector. According to V 1 with V r positional relationship, calculate V 2 , V 3 , V 4 :

[0034] if (a r -a)≥0, (b r -b)≥0, (c r -c)≥0, then V 2 (a+1, b, c), V 3 (a+1, b+1, c), V 4 (a+1, b+1, c+1);

[0035] if (a r -a)≥0, (b r -b)≥0, (c r -c)2 (a+1, b, c), V 3 (a+1, b+1, c), V...

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Abstract

The invention discloses a three-dimensional space vector modulation algorithm of a multi-level inverter. According to the algorithm, coordination transformation and trigonometric function operation are avoided, a three-phase reference voltage is directly mapped to a three-dimensional space coordinates system and sampled, the switching state vector closest to the sampled reference voltage vector is obtained through a round function, three coordinate components of the switching state vector are changed in sequence with the switching state vector as the starting point according to the relation between the switching state vector and the reference voltage vector, four switching state vectors are obtained, the reference voltage vector is combined through the four switching state vectors, and switching among the four switching state vectors is achieved. According to the algorithm, the space vector modulation algorithm of the multi-level inverter is simplified and is suitable for any multi-level inverter, and the output voltage zero-sequence component is controlled within the range shown in the specification, and the space vector modulation algorithm can be applied and popularized in the multi-level inverter.

Description

technical field [0001] The invention relates to the field of multilevel inverter modulation, in particular to a multilevel inverter three-dimensional space vector modulation algorithm. Background technique [0002] Because multilevel inverters can meet the requirements of high-power and high-quality output waveforms, and at the same time reduce harmonic distortion and electromagnetic interference, they are widely used in high-power, medium- and high-voltage applications. The modulation methods of multi-level inverter mainly include: carrier modulation method, space vector modulation method, specific harmonic elimination method and other modulation algorithms derived from these three main modulation algorithms. Among them, the space vector modulation algorithm has attracted much attention because of its low switching frequency, high DC voltage utilization rate, and good harmonic suppression effect. [0003] The traditional space vector modulation algorithm first samples the ...

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Application Information

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IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/0003
Inventor 王翠欧阳俊铭
Owner NANCHANG INST OF TECH
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