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A method for starting a solid-state transformer

A solid-state transformer and high-voltage side technology, applied in the direction of irreversible DC power input conversion to AC power output, output power conversion device, AC power input conversion to DC power output, etc., can solve the problem that the capacitor voltage cannot be charged, and Grid impact current and other problems to achieve the effect of solving grid-connected start-up impact, prolonging service life, and avoiding large current

Inactive Publication Date: 2017-09-01
TBEA SUNOASIS
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  • Abstract
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AI Technical Summary

Problems solved by technology

Since flexible DC transmission and SVG use the AC line voltage on the high-voltage side to charge the module, they cannot charge the capacitor voltage required for grid-connection on the high-voltage side, and there will be an inrush current for grid-connection at this time

Method used

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  • A method for starting a solid-state transformer

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Embodiment Construction

[0025] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Apparently, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] The topology structure of the solid-state transformer mentioned in the present invention applied to the photovoltaic power generation system is composed of a DC input module, a cascaded solid-state transformer module, and an AC output module. The DC side of the cascaded solid-state transformer module is connected in parallel with multiple photovoltaic arrays, so The solid-state transformer is divided into three phases, and each phase adopts multiple sub-modules connected in series with H-bridges on the high-vo...

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Abstract

The invention discloses a method for starting a solid-state transformer. The solid-state transformer allows grid-connecting to be conducted after high-voltage side capacitance rushes to a rated voltage, so that stable and impact-free starting of the solid-state transformer can be realized. The starting process includes dual active bridge operation and high-voltage side grid-connected operation; impact-free operation is realized in the two links; no harmful impact will be generated on equipment and power grids; the whole process will not generate any harmful impact on the system itself and the power grids; and the usage life of the equipment is prolonged.

Description

technical field [0001] The invention belongs to the technical field of power electronic transformers, and relates to a method for starting a solid-state transformer. Background technique [0002] The present invention relates to the application of power electronic transformer (PET-PowerElectronic Transformer) / solid state transformer (SST-Solid State Transformer) / electric energy router (EER-Electrical Energy Router) in the field of high-voltage photovoltaic grid-connection, which can be applied to the field of photovoltaic grid-connection It is called a high-voltage photovoltaic grid-connected inverter, which can replace the overall grid-connected solution of traditional photovoltaic inverter + step-up transformer. It has low standby loss, high system efficiency, and high degree of intelligence, and will not pollute the environment. and other advantages. [0003] The solid-state transformer adopts a cascaded topology, and the module is a H-bridge + dual active bridge direct ...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02J3/38
CPCH02J3/383H02M7/4807Y02E10/56
Inventor 于向恩刘韬轩杨
Owner TBEA SUNOASIS
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