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Simplified three-level space vector modulation method

A space vector modulation and space vector technology, which is applied in the field of power electronics, can solve the problems of not restricting the utilization rate of DC voltage, the control effect is not large, and the space complexity is increased, so as to reduce the algorithm time, simplify the judgment process, and reduce the calculation delay. effect when

Inactive Publication Date: 2014-04-16
SOUTHEAST UNIV
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Problems solved by technology

In fact, the large vector does not affect the balance of the capacitor voltage on the DC side, nor restricts the utilization of the DC voltage. It has little effect on the entire control, but increases the complexity of the space.

Method used

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  • Simplified three-level space vector modulation method
  • Simplified three-level space vector modulation method
  • Simplified three-level space vector modulation method

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] The simplified three-level space vector modulation method of the present invention considers that the large vector neither affects the balance of the capacitor voltage on the DC side nor restricts the utilization rate of the DC voltage, so it is considered to be removed, so that not only will it not affect the control effect, And the space complexity is reduced. figure 1 is the voltage space vector partition diagram of the method of the present invention, figure 2 is the traditional voltage space vector partition map, compared with figure 1 with figure 2 It can be seen that a simplified three-level space vector modulation method provided by the present invention reduces the effective vector from 27 to 21, and the effective area is reduced from 24 to 18, which reduces the space complexity and is beneficial to the three-level space vector modul...

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Abstract

The invention discloses a simplified three-level space vector modulation method. The method comprises the following steps of (1) obtaining a reference voltage synthesizing vector according to the three-phase voltage of a control system; (2) determining a large sector which the reference voltage synthesizing vector belongs to; (3) determining a small sector which the reference voltage synthesizing vector belongs to (4) calculating the action time of the reference voltage synthesizing vector in the small sector; (5) arranging the switching sequence of every vector in the small sector which the reference voltage synthesizing vector; (6) calculating the duty ratio according to the switching sequence. According to the simplified three-level space vector modulation method, by deprecating 6 large vectors and dividing voltage vector space through the other 21 fundamental space vectors, the quantity of the voltage vectors and sectors can be reduced, the space complexity can be reduced, the algorithm running time can be effectively shortened, the running efficiency can be improved and popularization and application of the three-level space vector modulation technology can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of power electronics and relates to a three-level space vector modulation method. Background technique [0002] For three-phase inverters, the commonly used modulation methods mainly include sinusoidal pulse width modulation technology SPWM and space vector pulse width modulation technology SVPWM. SPWM technology is to use the PWM waveform equivalent to sine wave to control the on-off of the switching device in the inverter circuit with the pulse width changing according to the sine law, which is simple, effective and easy to implement; SVPWM technology is based on different switching modes of the three-phase inverter. Switching to form a PWM wave, so that the actual flux vector formed to track its accurate flux circle requires additional calculation time, but it can improve the utilization of the DC bus voltage, especially in the field of motor speed regulation. application. According to the space vector ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
Inventor 谭风雷白晨阳
Owner SOUTHEAST UNIV
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