Medium-voltage frequency converter capable of realizing AC-AC (alternating-current) direct transformation

A frequency converter and converter technology, applied in the field of frequency converter, can solve the problems of large volume, poor performance and high cost of the whole machine, and achieve the effects of electrical isolation and step-up ratio, no harmonic current pollution, and low line loss

Inactive Publication Date: 2011-09-14
XINGTAI SIDA ELECTRIC
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] After searching the existing technical literature, it was found that the Chinese patent application number: 02104140.7, the patent titled "High Voltage High Power Frequency Converter Without Harmonic Pollution"; "Research on Technology" (Shanghai University Doctoral Dissertation. February 2006) also discloses the application of cascade multiplexing, that is, multi-stage series connection in a certain range, which plays the role of frequency conversion, voltage regulation and speed regulation, energy saving and consumption reduction, both in theory and practice. It proves that the cascaded inverter

Method used

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  • Medium-voltage frequency converter capable of realizing AC-AC (alternating-current) direct transformation
  • Medium-voltage frequency converter capable of realizing AC-AC (alternating-current) direct transformation
  • Medium-voltage frequency converter capable of realizing AC-AC (alternating-current) direct transformation

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Embodiment 1

[0017] like figure 1 As shown, this embodiment includes: a step-down transformer 1 and three converter arrays 2, 3, 4, wherein: the three three-phase secondary windings of the step-down transformer 1 are connected with the three converter arrays 2, 3, 4 respectively input connection.

[0018] The initial phase of the step-down transformer is 0 °, and the adjacent three-phase secondary windings of the step-down transformer have different phases, and the absolute value of the basic phase difference is 20 °, that is, the secondary winding of +20 ° phase 5, Secondary winding 6 for 0° phase and secondary winding 7 for -20° phase.

[0019] The primary winding of the step-down transformer and the secondary winding 6 of the 0° phase adopt the Yg connection method, and the secondary winding 5 of the +20° phase and the secondary winding 7 of the -20° phase adopt the zigzag connection method.

[0020] The converter array 2 includes: three matrix transformation circuits M1, M2, M3 and t...

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Abstract

The invention provides a medium-voltage frequency converter capable of realizing AC-AC (alternating-current) direct transformation, belonging to the technical field of frequency converters and comprising a reduction transformer and three converter arrays, wherein three three-phase secondary windings of the reduction transformer are respectively connected with input ends of the three converter arrays. The medium-voltage frequency converter is novel in conception, strong in generality and simple in overall structure, and can improve power factors of network sides.

Description

technical field [0001] The invention relates to a device in the technical field of frequency converters, in particular to a medium-voltage frequency converter for AC-AC direct conversion. Background technique [0002] In the field of three-phase medium-voltage frequency conversion speed regulation, a cascaded inverter of multi-stage series voltage source inverter is commonly used, which belongs to the high-low-high type, and the maximum input voltage is 10kV. Generally, uncontrolled rectifiers are used, and a few use three-phase controlled rectifiers. High-low-high type cascaded inverter, the general structure includes 3x stages of three-phase uncontrolled rectifiers, 3x stages of single-phase voltage source inverters, a step-down transformer with high-voltage input and low-voltage output, and the characteristics of the step-down transformer The primary is a Y-connected three-phase winding, and the secondary is a number of meandering three-phase windings with 3x series. The...

Claims

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Application Information

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IPC IPC(8): H02M5/16H02P27/16
Inventor 蒋婷李华武马红星江剑锋杨喜军
Owner XINGTAI SIDA ELECTRIC
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