Grid-connected and off-grid system, control method thereof, new energy grid-connected and off-grid system and multi-parallel grid-connected and off-grid system

A control method and new energy technology, applied in the direction of AC network circuit, AC network load balancing, single-network parallel feeding arrangement, etc., can solve problems such as large excitation inrush current, achieve the effect of reducing service life and avoiding damage

Pending Publication Date: 2021-04-23
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a grid-connected and off-grid system and its control method, a new energy grid-connected and off-grid system, and a multi-parallel parallel-connected and off-grid system to solve the huge excitation caused by the direct switching of transformers to the grid in the prior art. flow problem

Method used

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  • Grid-connected and off-grid system, control method thereof, new energy grid-connected and off-grid system and multi-parallel grid-connected and off-grid system
  • Grid-connected and off-grid system, control method thereof, new energy grid-connected and off-grid system and multi-parallel grid-connected and off-grid system
  • Grid-connected and off-grid system, control method thereof, new energy grid-connected and off-grid system and multi-parallel grid-connected and off-grid system

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Embodiment Construction

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0056]In this application, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. an actual relationship or order. Moreover, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements incl...

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Abstract

The invention provides a grid-connected and off-grid system, a control method of the grid-connected and off-grid system, a new energy grid-connected and off-grid system and a multi-parallel grid-connected and off-grid system. In the grid-connected and off-grid system, a direct-current side of a power converter is connected with a grid-connected and off-grid switching cabinet through a transformer branch and is connected with the power grid and a load through the grid-connected and off-grid switching cabinet, and a bypass branch is connected with the transformer branch in parallel, so that the transformer can be prevented from being directly switched to the power grid, and excitation surge current cannot be caused; therefore, the damage of power distribution equipment or the triggering of a protection device or the reduction of the service life of a transformer caused by magnetizing inrush current is avoided.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a grid-connected and off-grid system and a control method thereof, a new energy grid-connected and off-grid system, and a multi-parallel connected and off-grid system. Background technique [0002] Under normal circumstances, the existing new energy power generation system or energy storage system, in addition to the grid-connected charging and discharging function, also needs to have off-grid power generation or backup power function, that is, in the corresponding system, add an AC output as a load access port , to ensure the normal power supply of the load when the grid is powered off and the system switches to the off-grid state. [0003] Such as figure 1 In the energy storage system shown, in the energy storage system, the battery 01 is connected to one side of the winding of the transformer 03 through the PCS 02 (Power Conversion System, energy storage converter),...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/38H02J3/381H02J3/388H02J3/32H02J2300/24H02J2300/28H02J2300/30Y02E10/56
Inventor 刘高文曹伟刘洋
Owner SUNGROW POWER SUPPLY CO LTD
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