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Method and device thereof for generating three-phase sine waves

A sine wave, a technology for generating circuits, applied in the field of generating three-phase sine waves

Inactive Publication Date: 2009-12-16
LEIQI ENERGY SAVING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As we all know, when the traditional three-phase phase voltage is a sine wave, its line voltage is equal to the phase voltage Although the phase voltage can be appropriately reduced and the voltage utilization rate can be improved by inserting the third harmonic, the waveform of the line voltage still contains the third harmonic

Method used

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  • Method and device thereof for generating three-phase sine waves
  • Method and device thereof for generating three-phase sine waves
  • Method and device thereof for generating three-phase sine waves

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Embodiment Construction

[0101] Embodiments, the present invention will be described in detail by taking a multi-level cascaded high-voltage converter as an example.

[0102] figure 1 It is the topological structure diagram of the multi-level cascaded high-voltage frequency converter. For a three-phase power supply connected in star form, 9 phase A power units are connected in series on the A phase power supply, 9 B phase power units are connected in series on the B phase power supply, and 9 C phase power units are connected in series on the C phase power supply. The units respectively include a PWM generator and a switching device, and the A-phase power unit, the B-phase power unit and the C-phase power unit are respectively electrically connected to the phase voltage generating circuit.

[0103] figure 2 For a block diagram of a phase voltage generating circuit in a device for generating three-phase sine waves, the phase voltage generating circuit includes:

[0104] Angle generating circuit for ...

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Abstract

The invention relates to a method for generating three-phase sine waves, comprising an angle generation step and a phase voltage waveform data generation step. In the method, the range of a phase angle theta in a certain sampling period is judged according to the value of the phase angle theta, data conversion processing is carried out, the duty ratio data u of phase voltage in the sampling period are obtained and transmitted to a PWM generator, and the PWM generator sends out a pulse control signal for controlling the operation of a switching component, so that a phase voltage waveform of a certain phase is output, and a three-phase phase voltage waveform vector with the phase angle phase difference of 120 degrees is synthesized to obtain a three-phase line voltage sine wave; and when the maximum value of phase voltage is U, the maximum value of line voltage is 2U, and the obtained three-phase line voltage is sequentially symmetrical. Compared with a traditional mode that the line voltage is 2 times of the phase voltage when the three-phase phase voltage is a sine wave, the voltage utilization rate of a switching component in a power unit is enhanced, so that the purpose of lowering the power supply voltage of the power unit is realized.

Description

technical field [0001] The invention relates to a method and a device for generating three-phase sine waves, belonging to the technical field of power electronics. Background technique [0002] With the development of multi-level unit cascaded high-voltage inverters, people realize that reducing the power supply voltage of the inverter power unit can improve the voltage utilization of the power unit, improve the reliability of the high-voltage inverter, and reduce the withstand voltage requirements of the device. , It is of great significance to improve the efficiency of electricity consumption. As we all know, when the traditional three-phase phase voltage is a sine wave, its line voltage is equal to the phase voltage times, although the phase voltage can be appropriately reduced and the voltage utilization rate can be improved by inserting the third harmonic, but the waveform of the line voltage still contains the third harmonic. Contents of the invention [0003] The...

Claims

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Application Information

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IPC IPC(8): H03B28/00H03K3/80
Inventor 张金刚常大刚
Owner LEIQI ENERGY SAVING TECH
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