Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Photovoltaic grid-connected inverter multi-mode control method and system with dual parallel structure

A technology of control system and inverter, applied in the direction of photovoltaic power generation, AC network circuit, single network parallel feeding arrangement, etc., to achieve the effect of small self-loss, small output harmonics, and reduce daily loss

Active Publication Date: 2016-08-17
CSIC HAIWEI ZHENGZHOU HIGH TECH CO LTD
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem of improving the service life of existing dual-type photovoltaic inverters, and provides a multi-mode control method for photovoltaic grid-connected inverters with double-parallel structures and long service life

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
  • Photovoltaic grid-connected inverter multi-mode control method and system with dual parallel structure
  • Photovoltaic grid-connected inverter multi-mode control method and system with dual parallel structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] Such as figure 1 As shown, the multi-modal control method of the photovoltaic grid-connected inverter with dual parallel structure in the present invention is actually a solution for a grid-connected photovoltaic power generation system. The grid-connected photovoltaic power generation system mentioned above includes: photovoltaic modules, three-phase photovoltaic grid-connected inverters and power grids. Three-phase grid-connected photovoltaic power generation system is the main form of large-scale photovoltaic power generation system, with complex structure, high power, high technical requirements and high efficiency. It generally uses a three-phase full-bridge inverter; photovoltaic modules are usually composed of solar cells connected in series.

[0019] The invention first detects the output power of the photovoltaic grid-connected inverter in real time. The sensors of the inverter can only detect the grid voltage and output current, and they are all three-phase A...

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 discloses a multi-mode control method for a photovoltaic grid-connected inverter with a duplex parallel structure. Real-time detection is performed on the output power of the photovoltaic grid-connected inverter; when the output power of the inverter is less than 2 percent of rated power, the inverter enters a stand-by state, and two sets of inversion unit modules respectively stop working; when the output power of the inverter is greater than 2 percent of the rated power and less than 45 percent of the rated power, the inverter enters a low-power state, and only one set of inversion unit modules is started to work; when the output power of the inverter is greater than 45 percent of the rated power, the inverter enters a high-power state, and the two inversion unit modules are both in a working state. According to the multi-mode control method for the photovoltaic grid-connected inverter with the duplex parallel structure, disclosed by the invention, under the stand-by mode, the two sets of inversion unit modules stop working; under the low-power mode, only one set of inversion unit modules works; under the high-power mode, the two sets of inversion unit modules work simultaneously, and thus, the daily loss of the inverter is reduced; the multi-mode control method for the photovoltaic grid-connected inverter with the duplex parallel structure, disclosed by the invention, has the advantages of being low in switching frequency, small in self-loss, small in output harmonic, and the like, and a greener energy resource can be provided for power grids.

Description

technical field [0001] This intellectual achievement belongs to the technical field of solar photovoltaic power generation, and specifically relates to a control method for a low-power dual solar photovoltaic grid-connected inverter. Background technique [0002] With the gradual depletion of conventional energy sources and various safety issues caused by them, renewable energy sources have received extensive attention from many countries in the world. Among the new renewable energy sources, photovoltaic power generation is the fastest growing, and all countries in the world regard the commercial development and utilization of solar photovoltaic power generation as an important development direction. [0003] As a key component in a photovoltaic grid-connected power station—a photovoltaic inverter, it must have the characteristics of high efficiency, low cost, and low power consumption. The efficiency and loss of high-power photovoltaic grid-connected inverters have attract...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCH02J3/383Y02E10/56
Inventor 王大鹏向阳谢战洪赵惠平高瑛李满马新科王笑非王旺球
Owner CSIC HAIWEI ZHENGZHOU HIGH TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com