Redundant control system and method applied to three-phase solid-state transformer

Abstract

The invention relates to a redundant control system and method applied to a three-phase solid state transformer. According to the technical schemes of the invention, the redundant control system applied to the three-phase solid state transformer is characterized in that the system comprises a plurality of power modules in an A phase, a B phase and a C phase and one redundant power module; the input stages of the plurality of power modules are connected in series, and the output stages of the plurality of power modules are connected in parallel; and the A phase, the B phase and the C phase share one redundant power module; and the redundant power module is divided into three parts, namely, an input stage, an isolation stage and an output stage, wherein the input stage of the redundant powermodule is connected with three high-voltage half-controlled bypass switches SR_1-SR_3, the output stage of the redundant power module is connected with three low-voltage full-control switches SR_4-SR_6, the input stage is a rectifying unit composed of 6 switching tubes, and the output stage is an inverter unit composed of 4 switching tubes. With the redundant control system and method applied tothe three-phase solid state transformer of the invention adopted, the number of the applied redundant power modules is decreased, transition time for replacing a faulty power module is shortened, andthe operational reliability of the system is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of AC-DC interface solid-state transformers in distribution networks, in particular to a redundant control system and method applied to three-phase solid-state transformers. Background technique [0002] In recent years, the application of power electronic devices in all aspects of the power system has become more and more extensive, and the power electronic power system has become a foreseeable trend in the development of the future power grid. The continuous growth of energy demand and the increasingly serious problems of environmental pollution have promoted the adjustment of energy structure centered on electricity and characterized by clean energy. The development and utilization of clean energy has become the common choice of major countries in the world. In the process of urban distribution network with power electronics, AC-DC interface power electronic equipment occupies a large proportion. Formal ...

AI Technical Summary

Problems solved by technology

As a result, a certain surge current may be generated, affecting the safety of equipment and systems

In addition, for three-phase solid-state transformers, this kind of redundant control of cooling and heating requires three redundant power modules, thereby increasing the redundancy cost of equipment

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