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Grid-connected inverter startup method, photovoltaic power generation system and terminal equipment

An inverter and inverter circuit technology, applied in the power grid field, can solve problems such as high cost and filter capacitor impact, achieve the effects of small inrush current, prevent device damage, and reduce the cost of the whole machine

Active Publication Date: 2021-04-09
厦门科华数能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a method for starting a grid-connected inverter, a photovoltaic power generation system and terminal equipment to solve the problems of high cost and certain impact on the filter capacitor in the prior art

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  • Grid-connected inverter startup method, photovoltaic power generation system and terminal equipment
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  • Grid-connected inverter startup method, photovoltaic power generation system and terminal equipment

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Embodiment Construction

[0021] In the following description, for the purpose of illustration rather than limitation, specific details such as a specific system structure and technology are set forth in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0022] In order to illustrate the technical solutions of the present invention, the following specific embodiments are used for description.

[0023] figure 1 This is a schematic diagram of an implementation flow of a method for starting a grid-connected inverter provided by an embodiment of the present invention. For convenience of description, only parts related t...

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Abstract

The present invention is applicable to the technical field of power grid, and discloses a method for starting a grid-connected inverter, a photovoltaic power generation system and terminal equipment. Instructing the inverter circuit to control the voltage of the filter capacitor to rise at a first preset rate; obtaining the three-phase voltage of the grid and the inverter output three-phase voltage of the grid-connected inverter, and judging whether the three-phase voltage of the grid and the inverter output three-phase voltage Keep consistent; if the three-phase voltage of the power grid and the three-phase voltage of the inverter output are consistent, then send a pull-in command to the main contactor; when the pull-in feedback signal of the main contactor is detected, after the first preset time, stop feeding to the main contactor. The inverter circuit sends a pulse signal; after a second preset time, the control loop of the grid-connected inverter is switched to the grid-connected control loop. The invention can ensure that the momentary impact current of the main contactor is small, the impact on the filter capacitor is small, and the cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of power grids, and in particular relates to a starting method of a grid-connected inverter, a photovoltaic power generation system and terminal equipment. Background technique [0002] The topology of the grid-connected inverter is basically an LC or LCL structure. Before the grid-connected inverter works, it is basically necessary to buffer, so that the voltage on the filter capacitor can be buffered to a certain extent, and then the main contactor is pulled in. [0003] At present, when the grid-connected inverter starts up, the voltage on the filter capacitor is buffered in the form of an auxiliary contactor and a buffer resistor. This method is costly and has a certain impact on the filter capacitor. SUMMARY OF THE INVENTION [0004] In view of this, embodiments of the present invention provide a method for starting a grid-connected inverter, a photovoltaic power generation system, and a terminal devi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M1/36H02J3/38H02J3/42
CPCH02J3/42H02M1/36H02M7/53875
Inventor 胡斌黄凯伦郑立宾
Owner 厦门科华数能科技有限公司