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Implementation method of thyristor-based high-quality active front-end converter

An implementation method and thyristor technology, which are applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc.

Inactive Publication Date: 2015-04-29
北京凯德中天科技发展有限公司
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Problems solved by technology

[0008] There is no published literature on thyristor-based high-quality active front-end converters

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  • Implementation method of thyristor-based high-quality active front-end converter

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Embodiment Construction

[0023] In order to realize the functions of low harmonics, high power factor, and energy feedback, the implementation method of high-quality active front-end converters based on thyristors adopts the topology of phase-shifting transformers. The system consists of a primary winding and two mutual difference 30 The phase-shifting transformer of the Y and △ secondary side windings of high degree, a 12-pulse thyristor converter and a set of multi-level DC current control and distribution unit, the control strategy is based on (1) and (2) A method for asymmetrically controlling the current of a three-phase converter bridge.

[0024] Analyzing the harmonic situation, the traditional 12-pulse rectifier distributes the DC flow evenly to two three-phase converter bridges for conversion. When the DC flow is evenly distributed to the two three-phase converter bridges, the two The AC output of three three-phase converter bridges contains 6k±1(k=1, 2,…) sub-harmonics, of which two three-ph...

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Abstract

The invention discloses an implementation method of a thyristor-based high-quality active front-end converter, belongs to the alternating-current converter control technology, and aims to intensively study the rectification system conversion mechanism of a frequency converter, a topological structure and a control technology and develop a thyristor-based high-quality active front-end converter with low harmonic wave, high power factor and electric power feedback capacity. The implementation method of the thyristor-based high-quality active front-end converter is characterized in that an active front-end conversion system of the converter comprises a phase-shifting transformer, a 12-pulse bridge inverter and a multi-level direct current control and synthesis unit, wherein the 12-pulse bridge inverter is formed by two completely identical 6-pulse thyristor bridge inverters. An asymmetrical current control strategy is adopted, two three-phase bridge inverters are controlled according to a given conversion rule, so that current on line side of the phase-shifting transformer is sine-wave current, the functions of low harmonic wave, free adjustability of a power factor, electric power feedback brake, adjustable large range of direct-current voltage and current are realized, and the method is applicable to green and energy-saving type active front-end converters with various voltage classes and various power ranges.

Description

technical field [0001] The invention belongs to the AC frequency converter control technology. Background technique [0002] The frequency converter has been in existence for more than 30 years, and its application has been developed rapidly. At present, it has been widely used in various industries, and has replaced the DC speed control system in some fields. The wide application of frequency converters has benefited from the rapid development of power electronic device manufacturing technology, converter technology, control technology, microcomputer technology, and large-scale integrated circuit technology. Similarly, the wide application of frequency converters has also effectively promoted the development of related technologies. . Under the mutual promotion of this technology, the frequency converter has been continuously developed and perfected in terms of miniaturization, high power, strong function, and easy operation. [0003] On the other hand, frequency converte...

Claims

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Application Information

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IPC IPC(8): H02M7/155
CPCH02M1/42H02M7/1555
Inventor 高毅夫陈琳琳刘昆
Owner 北京凯德中天科技发展有限公司
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