Control method for three-phase four-arm converter

A technology of three-phase four-bridge arm and control method, which is applied in the direction of converting irreversible DC power input into AC power output, output power conversion device, electrical components, etc., can solve the complex control circuit and is not suitable for medium and high frequency output applications. It can reduce the volume and weight of the system, improve the reliability and conversion efficiency of the system, and achieve the effect of small unbalance.

Inactive Publication Date: 2005-09-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

The disadvantages of this technology are: 1) the control circuit is complicated; 2) it is not suitable for the application of medium and high frequency output

Method used

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  • Control method for three-phase four-arm converter
  • Control method for three-phase four-arm converter
  • Control method for three-phase four-arm converter

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Embodiment Construction

[0024] The control technology of the present invention is suitable for figure 1 (a) and figure 1 (b) The switching point is preset for specific harmonic cancellation techniques.

[0025] consists of six switching tubes S 1 , S 2 , S 3 , S 4 , S 5 , S 6 The switching time of the three bridge arms is obtained by calculation. The calculation principle is that the fundamental wave meets the requirements, and the low-order harmonics of the 6k±1 order (where k is a natural number such as 1, 2, 3, 4) meet certain optimization principles. A cycle of switching pulses satisfies odd symmetry and half-wave even symmetry. Switch tube S 5 , S 6 The switching time of the composed bridge arm lags behind the switching tube S 3 , S 4 The switching time of the composed bridge arm; the switching tube S 3 , S 4 The switching time of the composed bridge arm lags behind the switching tube S 1 , S 2 Composed of switching moments of the bridge arm.

[0026] By the switch tube S 7 , S ...

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Abstract

The invention relates to a method for controlling three-phase four-leg converter, belonging to the field of power electronics converter. The method is that: the idea of generating switch tube control pulses of the four legs is that: the front three of the four legs adopt SPWM control or harmonic filtering technique to eliminate the 6k+/-1th harmonics (wherein, k is a natural number 1, 2, 3, 4,í¡), the control pulse for the fourth leg eliminates the phase voltage zero-sequence harmonics generated by the front three ones, by the SPWM control or harmonic filtering technique, i.e. by the mutually or approximately counteraction of the 3kth harmonics generated by the fourth leg and the 3kth harmonics generated by the front three ones. The invention eliminates all the low-order harmonics to ensure the quality of the output waveforms of the converter, applied to the application occasions of medium-high frequency output. The method makes the converter possess the advantages of low switching frequency, small total harmonic distortion (THD) of output voltage, etc.

Description

technical field [0001] The invention relates to a control method for a three-phase four-bridge arm converter, which belongs to a power electronic converter. Background technique [0002] There are three traditional control methods for three-phase four-leg converters: [0003] 1. Three-dimensional space vector control technology [0004] This technology utilizes 16 switching vectors formed by the switching states of the four bridge arms to dynamically synthesize the three-phase output vector, making its motion trajectory approximate to a flux linkage circle. The disadvantage of this technology is that the switching frequency is high, and it is not suitable for the application of medium and high frequency output. [0005] 2. Voltage and current double closed-loop control technology [0006] This technology realizes the adjustment of the output voltage according to the load condition through the dynamic tracking of the output current, and ensures the waveform quality of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12
Inventor 张方华王慧贞陈新龚春英丁勇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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