Method for controlling output power of photovoltaic inverter

A photovoltaic inverter and output power technology, which is applied in the direction of photovoltaic power generation, single grid parallel feeding arrangement, etc., can solve the problems of inverter bus voltage reduction, photovoltaic cell module output power reduction, photovoltaic inverter off-grid, etc. , to achieve the effect of small amount of calculation, easy application, and avoiding off-network

Inactive Publication Date: 2011-07-13
SAMIL POWER
View PDF1 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, photovoltaic cell components will encounter shadows caused by clouds or buildings, for example, resulting in a reduction in the output power of photovoltaic cell components
At this time, if the photovoltaic inverter m

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for controlling output power of photovoltaic inverter
  • Method for controlling output power of photovoltaic inverter
  • Method for controlling output power of photovoltaic inverter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] According to an embodiment of the present invention, a method for controlling the output power of a photovoltaic inverter is proposed, including: detecting the change rate of the DC bus voltage of the photovoltaic inverter; The output power of the inverter enables the photovoltaic inverter to maintain grid-connected power generation. According to the method, when the photovoltaic cell module is shaded, the output power of the inverter can be appropriately reduced according to the change rate of the photovoltaic inverter bus voltage, so as to maintain the inverter bus voltage and prevent the inverter from going off-grid.

[0016] Such as figure 1 As shown, when the photovoltaic cell module encounters the shadow of the cloud or the building, the output power of the photovoltaic cell module will decrease. reduce.

[0017] In the method according to the embodiment of the present invention, it is predicted according to the change rate of the bus voltage whether the photovo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for controlling output power of a photovoltaic inverter. The method comprises the following steps: detecting the rate of change of the direct current bus voltage of the photovoltaic inverter; and when the direct current bus voltage is reduced and the rate of change is more than the threshold, reducing the output power of the photovoltaic inverter so that the photovoltaic inverter keeps grid-connected. The method is characterized by judging whether the photovoltaic cell pack is shadowed according to the rate of change of the direct current bus voltage based on the power change prediction, reducing the output power at the right time to ensure the photovoltaic cell pack and the photovoltaic inverter to be newly balanced and maintaining the direct current bus voltage to ensure the inverter to be continuously grid-connected. The method has the following advantages: the calculation amount is small; the reliability is high; the photovoltaic inverter can be effectively avoided from breaking away from the grid when being suddenly shadowed; and the method is easily applied in practice.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation, in particular to a method for controlling output power of a photovoltaic inverter. The method is based on the output power variation prediction of the photovoltaic inverter. Background technique [0002] At present, photovoltaic grid-connected inverters are widely used in the field of photovoltaic power generation. In practical applications, photovoltaic cell components may encounter shadows caused by clouds or buildings, for example, resulting in a reduction in the output power of the photovoltaic cell components. At this time, if the photovoltaic inverter maintains the power generation before the shading occurs, the bus voltage of the inverter will drop rapidly. When the bus voltage is lower than the minimum grid-connected voltage, the photovoltaic inverter will be disconnected from the grid. This situation is most common at noon when the amount of sunlight changes drastically. I...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 周谦陈晓高
Owner SAMIL POWER
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap