Redundant power supply of H-bridge cascading converter

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...

AI Technical Summary

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

Images