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A Three-phase PWM Rectification System Interleaved and Parallel

A technology of rectification system and parallel connection, which is applied in the direction of converting AC power input to DC power output, irreversible AC power input into DC power output, and output power conversion device, etc., which can solve problems such as current fluctuations in DC systems and achieve reduction Effects of high-frequency fluctuations, volume reduction, and interference reduction

Active Publication Date: 2019-10-11
XJ POWER CO LTD +3
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a three-phase PWM rectification system interleaved in parallel to solve the problem of large current fluctuations in traditional DC systems

Method used

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] Such as figure 1 As shown, this embodiment provides an interleaved parallel three-phase PWM rectification system including a three-phase input terminal, a first transformer, a second transformer, a third transformer and N PWM rectifier converters, N≥2, and the specific value of N Set according to actual requirements, where the three-phase input terminal is divided into A-phase input terminal, B-phase input terminal and C-phase input terminal, the first transformer is transformer T1, the second transformer is transformer T2, and the third transformer is transformer T3 , each PWM rectifier converter is a common three-phase six-switch topology, such as figure 2 shown.

[0021] Such as figure 1 As shown, the input terminal of phase A is connected to the primary winding of transformer T1, the input terminal of phase B is connected to the primary winding...

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Abstract

The present invention relates to a staggered parallel-connection type three-phase PWM rectifier system, which comprises N PWM rectifying converters, wherein N is larger than or equal to 2. An A-phaseinput end is connected with the original winding of a first transformer, and a B-phase input end is connected with the original winding of a second transformer. A C-phase input end is connected to theoriginal winding of a third transformer. The above three transformers are respectively provided with N secondary windings. The n secondary windings of the first transformer, the n secondary windingsof the second transformer and the n secondary windings of the third transformer are correspondingly connected with the alternating-current side of an n PWM rectifying converter, wherein n=1, 2, .., N. The direct-current sides of all PWM rectifying converters are connected in parallel to form a system output end. The PWM rectifying converters are connected in parallel, so that the current stress inside a switching tube can be reduced. Meanwhile, based on the staggered parallel technology, the fluctuation of the total input current and the harmonic of the current are reduced. Meanwhile, thehigh-frequency fluctuation of the total output voltage and the interference are reduced.

Description

technical field [0001] The invention relates to an interleaved and parallel three-phase PWM rectification system. Background technique [0002] Today, when green energy is vigorously advocated, higher requirements are placed on the power factor of the power module. At present, the application of single-phase power factor correction technology has been very mature, and low-power single-phase PFC power supplies have been able to be mass-produced. Now the power grid system has higher and higher requirements on the current harmonic content of the three-phase AC input of the equipment connected to the power grid. The high-power power supply module with its own power factor correction will be the development trend of the power supply module in the future. In general, there are two ways to expand the capacity of power modules: one is to increase the capacity of components, that is, to use power tubes with higher voltage and current stress to increase the capacity and volume of ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/23H02M7/219
Inventor 胡永华邓长吉曹亚曹智慧马瑞黄栋杰朱子庚李杰董钦
Owner XJ POWER CO LTD
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