Starting method suitable for solid-state transformer

A solid-state transformer and voltage technology, which is used in output power conversion devices, conversion of AC power input to DC power output, photovoltaic power generation, etc. Overload and other problems, to reduce the impact and prolong the service life

Inactive Publication Date: 2017-11-03
TBEA SUNOASIS
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Problems solved by technology

[0004] This kind of cascade topology is mostly seen in flexible DC transmission and SVG. The capacitor voltage on the high-voltage side of the module is pre-charged through the series soft-start resistor on the high-voltage side. Since the module is charged by the AC line voltage on the high-voltage side, it cannot be charged to the high-voltage side. The capacitor voltage required for grid connection, at this time there will be an inrush current f

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  • Starting method suitable for solid-state transformer
  • Starting method suitable for solid-state transformer
  • Starting method suitable for solid-state transformer

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Embodiment Construction

[0023] 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.

[0024] The present invention is applicable to the start-up method of solid-state transformers, and is suitable for the application of solid-state transformers in photovoltaic, wind power, energy storage and other fields. Taking the field of photovoltaic power generation as an example, the system is pre-charged through the low-voltage side, and all the energy required for start-up comes from The low-voltage DC source is connected to the grid after meeting the start-up conditions. Using this method to start the solid-s...

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Abstract

The invention discloses a starting method suitable for a solid-state transformer. According to the starting method suitable for the solid-state transformer, a system is pre-charged through a low-voltage side; the energy needed in starting all comes from a low-voltage direct current source; after a starting condition is satisfied, grid-connection operation is performed; by adoption of the starting method for the solid-state transformer, introduction of soft starting matched equipment is not required; instead, control can be performed by fully depending on device characteristic of the system, so that stable and impact-free starting of the system can be realized; and meanwhile, an impact current to the equipment and a power grid in the starting process also can be suppressed.

Description

technical field [0001] The invention belongs to the technical field of power electronic transformers, and relates to a method suitable 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) in the field of high-voltage photovoltaic grid-connection, which can be called a high-voltage photovoltaic grid-connection inverter when applied to the field of photovoltaic grid-connection , can replace the overall grid-connected solution of traditional photovoltaic inverter + step-up transformer, and has the advantages of low standby loss, high system efficiency, and high degree of intelligence. Chinese patent 201610222409.7 introduces the high-voltage photovoltaic grid-connected power generation system based on solid-state transformer array in detail. [0003] The solid-state transformer adopts a cascade...

Claims

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Application Information

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IPC IPC(8): H02M1/36H02M7/5375H02J3/38
CPCH02J3/383H02M1/36H02M7/5375Y02E10/56
Inventor 于向恩轩杨刘韬
Owner TBEA SUNOASIS
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