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Three phase inverter control method and apparatus thereof

A three-phase inverter and power control technology, applied in the direction of pulse duration/width modulation, conversion equipment with intermediate conversion to AC, etc., can solve the problems of difficult to achieve real-time performance, large amount of calculation, low quality of output voltage waveform, etc. question

Inactive Publication Date: 2009-07-08
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the quality of the output voltage waveform obtained by this control method is not high
Moreover, the control algorithm has a large amount of calculation and is complex. Even if advanced high-speed DSP digital signal processing is used, it is difficult to achieve real-time performance in practical applications.

Method used

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  • Three phase inverter control method and apparatus thereof
  • Three phase inverter control method and apparatus thereof
  • Three phase inverter control method and apparatus thereof

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Embodiment 1

[0024] use as Figure 4 In the specific circuit shown, the main circuit is a three-phase three-leg inverter bridge composed of six power switch tubes, which is composed of a three-phase filter reactor, a three-phase filter capacitor, and a three-phase step-up / step-down isolation transformer Δ / Y The output filter circuit is formed, and the three-phase filter reactor can be included in the three-phase step-up / step-down isolation transformer Δ / Y: V DC is the DC voltage, T 1 ~T 6 is the switch tube, L is the reactor, T is the Δ / Y transformer, and C is the filter capacitor. The structure of the circuit is simple. In practical applications, the three-phase filter reactor can be independent in the circuit, for example, independently at the output end of the three-phase three-leg inverter bridge, or it can be designed in the Δ / Y transformer. The three-phase filter capacitor is connected after Δ / Y, and the filtering effect is better. At the same time, the three-phase filter capacito...

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Abstract

The invention discloses a method of controlling a three-phase inverter and a device thereof. The device comprises a three-phase three-leg inverter bridge consisting of six power switch tubes, an output filter circuit including a three-phase filter reactor and a three-phase filter capacitor and a main circuit consisting of a three-phase boosting / decompression isolation transformer Delta / Y; a load voltage is processed through phase-separation PI proportional plus integral control; the three-phase inverter is led to keep the balance of three-phase output voltage under any linear or nonlinear unbalanced load. When in unbalanced load, symmetrical output voltage of the three-phase inverter, the equivalent three-phase magnitude, orthoscopic voltage waveform and high output voltage quality can be kept all the time, and the load is enabled to work normally.

Description

technical field [0001] The invention relates to a main circuit structure of a three-phase inverter power supply and a control method for the structure circuit, and is especially suitable for any unbalanced load of three phases, and is also suitable for a balanced load of a three-phase inverter power supply, such as: in a photovoltaic power generation system Three-phase inverter, unbalanced load of industrial control three-phase inverter power supply, etc. Background technique [0002] Three-phase inverter power supply is a power electronic device widely used at present. In many civil applications, three-phase inverters are usually required to have the ability to supply power to balanced / unbalanced, linear / nonlinear loads at the same time. Ideally, the output of a three-phase inverter power supply is not affected by the load, but the actual power supply has a certain output impedance. When the traditional three-phase inverter supplies power to an unbalanced load, the three-ph...

Claims

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Application Information

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IPC IPC(8): H02M3/28H03K7/08
Inventor 许建平曹太强徐顺刚张斐何圣仲
Owner SOUTHWEST JIAOTONG UNIV
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