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Diode clamping three-level frequency converter

A technology of three-level frequency converter and diode clamping, which is applied in the transformation equipment for intermediate conversion to DC, and the conversion of irreversible DC power input into AC power output, etc., which can solve the problem of large loss of switching tube and harmonic output waveform. wave, affecting the overall performance of diode-clamped three-level inverters, etc., to achieve the effects of improving quality, reducing switching losses, and reducing changes in distributed parameters

Inactive Publication Date: 2014-05-07
ROCKWELL AUTOMATION CONTROL SOLUTIONS (HARBIN) CO LTD
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Problems solved by technology

[0003] In order to solve the above technical problems, the present invention aims to provide a diode-clamped three-level inverter realized by a new type of power device module, which solves the problem that the switching tube loss is too large, the output waveform contains large harmonics, etc., which affect the diode clamp. Problems with the overall performance of the bit type three-level inverter

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Embodiment Construction

[0010] The present invention will be further explained in conjunction with the drawings:

[0011] Combine figure 2 , image 3 , A diode-clamped three-level inverter, mainly composed of a 12-pulse rectification link and a three-phase H-bridge power inverter unit, characterized in that the 12-pulse rectification link consists of a phase-shifting transformer 1 and two The diode full-bridge rectifier unit is composed together; the phase-shifting transformer 1 has two secondary windings, respectively a star connection and a delta connection, and the phase difference is 30°. The line voltage of the secondary winding is the line voltage of the primary winding. Half; the DC output ends of the two rectifiers 2 and rectifier 3 are connected in series, and the series point is drawn as the midpoint; 12-pulse rectification is beneficial to eliminate harmonics and improve the utilization rate of the power grid. 4, 5, and 6 are A, B, C three-phase H-bridge power inverter units, which are main...

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Abstract

The invention discloses a diode clamping three-level frequency converter, and relates to the field of intermediate pressure motor control. A 12-pulse rectifying link is mainly formed by a phase-shifting transformer and a diode full-bridge rectifying unit, an inversion unit consists of an insulated gate bipolar transistor (IGBT) and a fast recovery diode which are packaged in a module, and a main inversion circuit of the diode clamping three-level frequency converter consists of two power modules formed by serially connecting an anode with an IGBT collector and parallelly connecting an IGBT emitter with a cathode. The diode clamping three-level frequency inverter has the advantages that: the IGBT and the fast recovery diode for clamping have matched voltage current characteristics; meanwhile, the change of a distribution parameter caused by external wiring is reduced, the switching loss of a switching tube is reduced, and the quality of an output waveform and the efficiency of the whole frequency converter are improved.

Description

Technical field [0001] The technology of the present invention relates to the field of medium voltage motor control, in particular to a diode clamped three-level frequency converter. Background technique [0002] At present, the mid-point clamped medium-voltage three-level inverter has been widely used due to its simple structure, convenient control, and small output harmonics. Most diode-clamped three-level inverters use such figure 1 Circuit structure shown. Among them, C1 and C2 are DC filter capacitors, and divide the DC voltage into three potentials: P, O, and N. Taking phase A as an example, S1, S2, S3, and S4 are four power switch tubes connected in series, mostly using IGBTs, and d1, d2, d3, and d4 are their body diodes respectively. D1 and D2 are fast recovery diodes clamped at the midpoint. S1, S2 and S3, S4 are two dual-unit IGBT modules respectively. D1 and D2 are two external fast recovery diode modules. Because in the working process of the three-level inverter...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/44H02M7/48
Inventor 冷严冬孙敬华赵鹏曲文超
Owner ROCKWELL AUTOMATION CONTROL SOLUTIONS (HARBIN) CO LTD
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