A Redundant Power Supply for H-bridge Cascaded Converter

Abstract

The invention relates to a redundant power supply for an H-bridge cascaded converter. The redundant power supply is composed of 3N power modules with the same structure, and each power module includes 1 voltage equalizing resistor, 1 controllable switch, 1 DC / AC converter, 1 single-input and three-output quad Winding isolation transformer, 3 AC / DC converters, 6 output diodes, 1 DC input side and 3 DC output sides. Each power module corresponds to an H-bridge chain link. The input terminal of the power module is connected in parallel to the positive and negative poles of the DC bus support capacitor of the corresponding chain link. The three output terminals of the power module are respectively connected to the corresponding chain link and the most Two adjacent chain links provide control power. In the redundant power supply solution, each H-bridge link has 3 control power inputs, which come from the power supply module corresponding to the link and the power supplies corresponding to the two links most adjacent to the link. module, these 3 power inputs are directly connected in parallel to provide control power for the H-bridge chain links.

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...

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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 AC power supply scheme There are high requirements on the withstand voltage level of the isolation transformer, which is simple to implement but high in cost, and to prevent AC power loss, a UPS device must be used to ensure the reliability of power supply

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