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

A technology of solid-state transformer and redundant control, which is applied in the direction of control/regulation systems, instruments, and regulation of electrical variables, etc. It can solve problems such as inrush current, affecting the safety of equipment and systems, and increasing the cost of equipment redundancy, so as to achieve fast dynamic Response, redundant cost saving, design and production cost saving effects

CN109802571AInactive Publication Date: 2019-05-24ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-05-24
Estimated Expiration
Not applicable · inactive patent

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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.
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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 ...

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Embodiment Construction

[0049] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0050] A redundant control system applied to a three-phase solid-state transformer, characterized in that it includes: its topology includes a plurality of power modules and a redundant power module in the three phases A, B, and C, and a plurality of power modules adopt The input stage is connected in series and cascaded, and the output stage is connected in parallel and cascaded; in addition, the three phases A, B, and C share a redundant power module, which is divided into three parts: input stage, isolation stage and output stage. Its input stage is connected to three high-voltage semi-controlled bypass switches S R_1 -S R_3 , the output stage is connected to three low-voltage full-control switches S R_4 -S R_6 ; The input stage is a rectifier unit composed of 6 switching tubes, and the output stage is an inverter unit composed of 4 switching...