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Single phase AC-AC (Alternating Current-Alternating Current) direct frequency convertor topological structure and control method thereof

A technology of frequency converter and topology structure, which is applied in the field of single-phase AC-AC direct frequency converter topology and control, can solve the problems of complex control strategy of matrix converter, lower system reliability, heavy calculation work, etc., and achieve topological Simple, simple control strategy, high conversion efficiency and high power density

Inactive Publication Date: 2014-08-20
HARBIN ENG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the control strategy of the matrix converter is complex and the calculation work is heavy; in order to achieve safe commutation, a four-step commutation method is usually used, which increases the difficulty of control and reduces the reliability of the system. The number of switches is large and the system cost is high.

Method used

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  • Single phase AC-AC (Alternating Current-Alternating Current) direct frequency convertor topological structure and control method thereof
  • Single phase AC-AC (Alternating Current-Alternating Current) direct frequency convertor topological structure and control method thereof
  • Single phase AC-AC (Alternating Current-Alternating Current) direct frequency convertor topological structure and control method thereof

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Embodiment Construction

[0015] The present invention will be described in more detail below in conjunction with the drawings:

[0016] Combine figure 1 . U is a single-phase AC power supply; L and C are filters; the first full control device V1, the second full control device V2, the third full control device V3, the fourth full control device V4, the fifth full control device Type device V5, sixth full control device V6, seventh full control device V7, eighth full control device V8 are 8 unidirectional full control devices (take IGBT as an example, other full control devices such as PowerMOSFET , IGCT, etc. can also achieve this function), the first diode D1, the second diode D2, the third diode D3, the fourth diode D5, the fifth diode D6, and the sixth diode D7 is 6 diodes connected in anti-parallel with the corresponding full control device.

[0017] If constructing a positive output voltage U ab , In the power U AB The first full-control device V1 and the third full-control device V3 are turned o...

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Abstract

The invention provides a single phase AC-AC (Alternating Current-Alternating Current) direct frequency convertor and a control method thereof. The single phase AC-AC direct frequency convertor comprises a power supply, a filter circuit, a main circuit and a buffering circuit, wherein the power supply U is connected with the filter circuit and the main circuit; and the main circuit is connected with the buffering circuit. The control method of the single phase AC-AC direct frequency convertor is a single polarity control method or a hysteresis current control method. The single phase AC-AC direct frequency convertor has a simple topological structure, the control method is simple and practicable, the power conversion stage number is small, and the reliability is high.

Description

Technical field [0001] The invention relates to an electric energy conversion method, in particular to a single-phase AC-AC direct frequency converter topology and control method. Background technique [0002] In the conversion and utilization of electric energy, the AC-AC converter has an important position. It can realize the direct conversion of electric energy without intermediate links, thereby improving efficiency. It is generally divided into two aspects: voltage conversion without frequency conversion and direct voltage conversion and frequency conversion. In terms of voltage and frequency conversion, more mature technologies include thyristor voltage regulator controllers, PWM controlled AC-AC converters, etc. In terms of realizing AC-AC direct frequency conversion, the earlier technology is the thyristor-based cycloconverter technology, which has been very mature. The disadvantages are the large number of devices used, poor input and output characteristics, severe AC in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458
Inventor 赵凯岐白成彪张强
Owner HARBIN ENG UNIV
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