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A seven-segment svpwm modulation method for a five-level inverter

A modulation method and seven-segment technology, applied in the fields of power electronics and power transmission, can solve the problems of multiple redundant switching states, complex algorithms, and large amount of calculation, and achieve simplified judgment methods, AC voltage balance and symmetry, and reduced harmonics. The effect of wave distortion

Active Publication Date: 2017-10-27
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, with the increase of the number of levels, the algorithm is more complex, the amount of calculation is larger, and there are more redundant switch states

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  • A seven-segment svpwm modulation method for a five-level inverter
  • A seven-segment svpwm modulation method for a five-level inverter
  • A seven-segment svpwm modulation method for a five-level inverter

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Embodiment Construction

[0040] The technical solutions of the present invention will be further described through specific embodiments below in conjunction with the accompanying drawings.

[0041] Such as figure 1 , figure 2 as shown, figure 1 It is the topology diagram of the main circuit of the diode-clamped five-level inverter, figure 2 It is a control principle block diagram of the modulation method of the present invention.

[0042] The steps of the five-level inverter seven-segment SVPWM modulation method in this embodiment include: (1) judging the large sector where the input reference voltage vector is located; (2) realizing sector normalization through coordinate system transformation; ( 3) Determine the small sector where the reference voltage vector is located, and judge the type of the small sector; (4) Calculate the action time of the three basic voltage vectors; (5) Select the three basic voltage vectors to generate a switching state with a small common-mode voltage ; (6) Composin...

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Abstract

The invention discloses a seven-section type SVPWM (space vector pulse width modulation) method of a five-level inverter. The method mainly comprises the following steps of 1, judging a large sector; 2, normalizing the sector through conversion of a coordinate system; 3, determining a small sector of reference voltage vector and the type; 4, calculating the action time of three basic voltage vectors; 5, selecting the switching state with small common mode voltage generated by the three basic voltage vectors; 6, forming a seven-section type switching sequence according to the selected switching state; 7, utilizing the PWM pulse generated by the switching sequence to drive the five-level inverter. The method has the advantages that the accurate position of the reference voltage vector can be quickly determined, and the calculation formula of the action time of the basic voltage vector is uniform and simple; the harmonic distortion is decreased by the seven-section type switching sequence, the common mode voltage is reduced, and the outputted alternating current voltage is balanced and symmetric; the method is favorable for being popularized and applied to higher levels.

Description

technical field [0001] The invention relates to a modulation technology of a five-level power electronic inverter, in particular to a seven-stage SVPWM control method for a five-level inverter, which belongs to the field of power electronics and electric transmission. Background technique [0002] With the continuous development of power electronics technology, inverters are developing in the direction of high voltage and high power. Multilevel inverters have received extensive attention due to their sinusoidal output voltage waveforms, low harmonic content, and small switching losses. [0003] The voltage space vector control technology has a high voltage utilization rate and is the most widely used modulation method for multilevel inverters. However, as the number of levels increases, the algorithm becomes more complex, the amount of calculation is greater, and there are more redundant switch states. Contents of the invention [0004] Aiming at the problems existing in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
Inventor 张辉张传金张晓许欢庆王珂
Owner CHINA UNIV OF MINING & TECH
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