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

Wide-input double-grounding non-isolated single-phase photovoltaic inverter and control method thereof

A technology of photovoltaic inverter and control method, applied in photovoltaic power generation, single grid parallel feeding arrangement, etc., can solve the problems of reducing inverter efficiency, increasing the volume of booster unit, etc., to solve the problem of common mode leakage current, The effect of reducing size and number

Active Publication Date: 2020-06-02
YANCHENG INST OF TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the additional boost unit works during the entire operation cycle of the inverter, and needs to handle all the power output by the photovoltaic cells, which reduces the efficiency of the inverter and increases the volume of the boost unit

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
  • Wide-input double-grounding non-isolated single-phase photovoltaic inverter and control method thereof
  • Wide-input double-grounding non-isolated single-phase photovoltaic inverter and control method thereof
  • Wide-input double-grounding non-isolated single-phase photovoltaic inverter and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.

[0015] The specific embodiment of the present invention will be described according to the accompanying drawings. Depend on figure 1 It can be seen that the wide-input double-ground non-isolated single-phase photovoltaic inverter includes a photovoltaic cell PV, a first power tube S with an antiparallel diode 1 , the second power tube S 2 , the third power tube S 3 , the fourth power tube S 4 , the fifth power tube S 5 , the first diode D 1 , the second diode D 2 , the third diode D 3 , the first inductance L 1 , the second inductance L 2 , the third inductance L 3 , the first capacitance C 1 , the second capacitance C 2 , input capacitance C in and the grid or load; the specific topology is: the positive pole of the photovoltaic cell PV is connected to the first capacitor C 1 One end of the first power tube S 1 One end of the input c...

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 wide-input double-grounding non-isolated single-phase photovoltaic inverter and a control method thereof. The grid-connected inverter comprises a photovoltaic cell, a first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor, an input capacitor, a first diode, a second diode, a third diode, a first power tube, a second power tube, a thirdpower tube, a fourth power tube, a fifth power tube and a power grid. The control method comprises the following steps: when the power grid voltage is in a positive half cycle and the instantaneous value of the power grid voltage is smaller than the input voltage, the fourth power tube is modulated, the fourth power tube is switched at high frequency or the fourth power tube and the fifth power tube are in complementary conduction, and the third power tube is in normal conduction; in the positive half cycle of the power grid voltage, when the instantaneous value of the power grid voltage is greater than the input voltage, the second power tube is modulated, the second power tube is switched at high frequency and the fourth power tube is normally switched on; and when the power grid voltageis in a negative half cycle, the first power tube is modulated and works at high frequency, and the fifth power tube is normally on. According to the invention, the problem of double-grounding topology leakage current is fundamentally solved; the problem that the inverter is shut down due to undervoltage of a photovoltaic panel under the shadow condition is solved, the optimal processing power ofa boosting unit is achieved, and the size of the inverter is reduced; two-stage control is changed into single-stage control, only one power tube is in a high-frequency switching state at each moment, and the efficiency is improved.

Description

technical field [0001] The invention relates to a control method of a photovoltaic grid-connected inverter, in particular to a double-grounded non-isolated single-phase photovoltaic grid-connected inverter and a control method thereof. Background technique [0002] With the development and progress of society, clean energy such as solar energy has become the object of human development and utilization in the future due to its clean and renewable advantages. Photovoltaic grid-connected inverter is an important part of solar power generation. Compared with the traditional isolated photovoltaic grid-connected inverter, the non-isolated photovoltaic grid-connected inverter has the advantages of small size, light weight and high efficiency. But there is an electrical connection between the photovoltaic cells of the non-isolated photovoltaic grid-connected inverter and the grid. When the power tube of the non-isolated photovoltaic grid-connected inverter switches at high frequen...

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 Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 姚志垒王众
Owner YANCHENG INST OF TECH
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