Multi-level photovoltaic grid-connected inverter with isolation transformer

An isolation transformer and multi-level technology, applied in the field of power conversion, can solve the problems of filter device loss, rectifier device loss, transformer primary modulation device loss, etc., to achieve high conversion efficiency and reduce loss

Inactive Publication Date: 2012-10-03
JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO LTD
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in most of the mains cycle, high pulses will cause loss of filter devices, rectifier device losses, and also cause unnecessary loss of transformer primary modulation devices

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
  • Multi-level photovoltaic grid-connected inverter with isolation transformer
  • Multi-level photovoltaic grid-connected inverter with isolation transformer
  • Multi-level photovoltaic grid-connected inverter with isolation transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0019] refer to figure 1 and figure 2 As shown, the multi-level photovoltaic grid-connected inverter with isolation transformer consists of power supply A, pre-DC / DC converter B, high-frequency SPWM modulation circuit C, high-frequency isolation transformer D, rectifier unit E, filter and converter Composed of the unit F, the first capacitor C1 and the second capacitor C2, the power supply A is connected in parallel with the first capacitor C1, the front DC / DC converter B is connected with the first capacitor C1, and the second capacitor C2 In parallel, the high-frequency SPWM modulation circuit C is connected in parallel with the second capacitor C2, the high-frequency SPWM modulation circuit C is connected to the rectifier unit E through a high-frequency isolation transformer D, and the rectifier unit E is connected to the filter...

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-level photovoltaic grid-connected inverter with an isolation transformer. The multi-level photovoltaic grid-connected inverter comprises a power source, a preposed DC/DC converter, a high-frequency SPWM (sinusoidal pulse width modulation) modulation circuit, a high-frequency isolation transformer, a rectification unit, a filtering and inverting unit, a first capacitor and a second capacitor, wherein the power source is connected with the first capacitor in parallel; the preposed DC/DC converter is connected with the first capacitor in parallel and is connected with the second capacitor in parallel; the high-frequency SPWM modulation circuit is connected with the second capacitor in parallel, and is connected with the rectification unit through the high-frequency isolation transformer; the rectification unit is connected with the filtering and inverting unit; and the high-frequency isolation transformer is formed by a first inductor and a second inductor in coupling. With the adoption of the multi-level photovoltaic grid-connected inverter with the isolation transformer, the loss of switch devices is reduced as far as possible; and high conversion efficiency is achieved.

Description

technical field [0001] The invention relates to the technical field of power conversion, in particular to a multi-level photovoltaic grid-connected inverter with an isolation transformer. Background technique [0002] The voltage on the primary side of the high-frequency transformer of the traditional high-frequency isolated photovoltaic grid-connected inverter is constant for a certain period of time. After modulation, the secondary side of the transformer outputs a pulse with a fixed amplitude, and then transmits the energy to the power grid. Since the grid voltage changes sinusoidally, in order to ensure that the energy of the inverter can be transmitted to the grid during the entire grid cycle, the voltage pulse amplitude output by the secondary side of the transformer must be greater than the peak value of the grid. In fact, due to the constant input voltage of the primary side of the transformer, the pulse amplitude output by the secondary side is kept above the peak ...

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): H02J3/38H02M7/48
Inventor 向军
Owner JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO LTD
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