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Three-phase sine wave inverter control method with high DC voltage utilization

A technology of high DC voltage and control method, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc. PWM type PWM DC voltage utilization rate is high, to achieve the effect of expanding the normal operating voltage range, high DC voltage utilization rate, high DC voltage utilization rate

Inactive Publication Date: 2017-05-03
NORTHWESTERN POLYTECHNICAL UNIV
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AI Technical Summary

Problems solved by technology

Due to the combination of switch point preset PWM and unipolar SPWM, the technical problem of difficult online voltage regulation of switch point preset PWM is solved, and at the same time, the characteristic of high DC voltage utilization rate of switch point preset PWM is retained

Method used

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  • Three-phase sine wave inverter control method with high DC voltage utilization
  • Three-phase sine wave inverter control method with high DC voltage utilization
  • Three-phase sine wave inverter control method with high DC voltage utilization

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Embodiment Construction

[0025] refer to Figure 1-3 . The specific steps of the three-phase sine wave inverter control method with high DC voltage utilization rate of the present invention are as follows:

[0026] Determine the number of switch points m within the 1 / 4 period of the switch point preset PWM wave, and the switch angles are respectively used by θ 1 , θ 2 ,...,θ m Indicates that, taking the DC side voltage of the inverter bridge as the unit 1, the nth harmonic voltage amplitude U in the PWM wave n for:

[0027] m is an even number

[0028] m is an odd number

[0029] According to the fundamental amplitude U 1 Optimize based on the principle that the maximum or low-order harmonic content is zero, and obtain the switching angle value within 1 / 4 cycle, and then determine the entire cycle according to the characteristics of 1 / 2 cycle symmetry and 1 / 4 cycle symmetry of the preset PWM wave at the switch point The internal switching point presets the PWM waveform.

[0030] Determine...

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Abstract

The invention discloses a three-phase sine wave inverter control method having a high DC voltage utilization ratio, and aims to solve the technical problem of difficulty in online voltage regulation in the prior art. The technical scheme is that through the mixing of switching node preset PWM and unipolar SPWM, the purpose of regulating output voltage by adjusting the modulation ratio of a unipolar SPWM wave is achieved; and meanwhile, when the modulation ratio M of the unipolar SPWM wave is equal to 0, the control method provided by the invention is degraded to the switching node preset PWM, thereby retaining the characteristic of high DC voltage utilization ratio. With the combination of the switching node preset PWM and the unipolar SPWM, the technical problem of difficulty in online voltage regulation for the switching node preset PWM is solved. According to the invention, the output voltage fundamental voltage amplitude and the modulation ratio M are in linear relationship that U1=-1.7299*M+1.0134, and thus the inverter applying the method is allowed to work at low voltage.

Description

technical field [0001] The invention relates to a control method for a three-phase sine wave inverter, in particular to a control method for a three-phase sine wave inverter with high DC voltage utilization. Background technique [0002] Among the commonly used three-phase bridge inverter control methods, the PWM control methods include pure sine modulation SPWM, third harmonic injection PWM and switch point preset PWM. [0003] Document 1 "Power Electronics Technology, 2000, p150-162" expounds the characteristics of the pure sine modulation SPWM control method. Its main implementation method is to determine the high and low levels of the output PWM through the real-time comparison of high-frequency triangular waves and sine waves. This method Simple and easy to implement, but its DC voltage utilization rate is only 0.866. [0004] Document 2 "The use of harmonic distortion to increase the output voltage of a three-phase PWM inverter, Industry Applications, IEEE Transaction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387
Inventor 郑先成宋勇刚吴小华张晓斌李伟林宋丹
Owner NORTHWESTERN POLYTECHNICAL UNIV
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