Redundant power supply of H-bridge cascading converter

A power supply and converter technology, applied in AC network circuits, converting irreversible DC power input to AC power output, and converting AC power input to DC power output, etc., can solve the problem of high cost and ensure reliability. Effect

Active Publication Date: 2013-09-25
苏州四方智电能源科技有限公司
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Problems solved by technology

In the working process of high-voltage applications, each H-bridge chain link is suspended at different potentials, and there is a large potential difference between them. The power supply mode of each H-bridge unit becomes a technical problem. The general

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  • Redundant power supply of H-bridge cascading converter
  • Redundant power supply of H-bridge cascading converter
  • Redundant power supply of H-bridge cascading converter

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Embodiment Construction

[0014] The redundant power supply of the H-bridge cascaded converter designed in the present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] The topology of a typical H-bridge cascaded converter is shown in the attached figure 1 As shown in , it is assumed that each phase of the H-bridge cascaded converter contains N H-bridge links, and N is an integer greater than 1. The redundant power supply of the H-bridge cascaded converter proposed by the present invention is composed of 3N power supply modules with the same structure, and the structure of the power supply modules is as attached figure 2 As shown in , it includes 1 DC / AC converter S1, 1 single-input and 3-output four-winding isolation transformer T1, 3 AC / DC converters U1, U2, U3, 6 output diodes (D1~D6), 1 DC input side and 3 DC output sides, the DC input side includes two terminals IN+, IN-, and the 3 DC output sides each include two terminals, namely OUT1+, OUT1-, ...

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Abstract

The invention relates to a redundant power supply of an H-bridge cascading converter. The redundant power supply is composed of 3N power modules with identical structures, each power module comprises an equalizing resistor, a controllable switch, a DC/AC converter, a single-input three-output four-winding isolation transformer, three AC/DC converters, six output diodes, a direct current input side and three direct current output sides. Each power module corresponds to an H-bridge chain link, the input ends of the power modules are connected to the positive electrodes and the negative electrodes of the direct current bus supporting capacitors of the corresponding chain links in parallel, and the three output ends of the power modules provide control power supplies for the corresponding chain links and two chain links most adjacent to the power modules respectively. According to the scheme of the redundant power supply, each H-bridge chain link is provided with three channels of control power inputs, and the three channels of power inputs are from the power module corresponding to each H-bridge chain link and the power modules corresponding to two chain links most adjacent to each H-bridge chain link respectively, and are connected together in parallel to provide the control power supplies for each H-bridge chain link.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters, and in particular relates to a redundant power supply for H-bridge cascaded converters. Background technique [0002] H-bridge cascaded multi-level structure has been widely used in high-voltage frequency converters, static synchronous compensators (STATCOM) and other fields due to its outstanding advantages such as large number of levels, good harmonic characteristics, and easy realization of high-voltage and large-capacity. The H-bridge cascaded converter can achieve a very high output voltage (10kV and above) by connecting multiple H-bridge links in series. In the working process of high-voltage applications, each H-bridge chain link is suspended at different potentials, and there is a large potential difference between them. The power supply mode of each H-bridge unit becomes a technical problem. The general AC power supply scheme There are high requirements on the withst...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M7/49
CPCH02J3/1857H02M1/36Y02E40/20H02M7/4835
Inventor 梅红明刘建政
Owner 苏州四方智电能源科技有限公司
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