Unlock instant, AI-driven research and patent intelligence for your innovation.

Three-level multi-pulse output transformer-free type inversion circuit

An inverter circuit and multi-pulse technology, applied in output power conversion devices, conversion of AC power input to DC power output, photovoltaic power generation, etc., can solve the problems that hinder the improvement of power density and the utilization rate of power switching devices is not improved.

Active Publication Date: 2017-09-05
SHANGHAI CHINT POWER SYST
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the utilization rate of power switching devices has not improved, which hinders the improvement of power density

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
  • Three-level multi-pulse output transformer-free type inversion circuit
  • Three-level multi-pulse output transformer-free type inversion circuit
  • Three-level multi-pulse output transformer-free type inversion circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] Below in conjunction with specific embodiment, further illustrate the present invention.

[0047] The invention provides a circuit for converting direct current into alternating current, which can be used for grid-connected solar power generation. Such as figure 1 As shown, the input end of the circuit is the solar generator SG, and the output end is the AC power grid Ug. It consists of three links, namely power frequency link, high frequency link, and filter link.

[0048] Among them, the high-frequency link circuit is composed of 2 to n high-frequency link units, n is a set value, and the actual number can be determined according to design requirements. The power frequency link includes two DC capacitors C1~C2 and four switch tubes T1~T4. Each high-frequency link unit includes two switch tubes Tx1, Tx2, where x is the serial number of the high-frequency link unit, and x=1, 2, . . . . The filter link includes a plurality of filter inductors Lf1, Lf2..., Lfn and a f...

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 three-level multi-pulse output transformer-free type inversion circuit which comprises a power frequency link, a high frequency link and a filtering link. The power frequency link comprises two DC capacitors and four switch tubes; the high frequency link is composed of multiple high frequency link units; each high frequency link unit comprises two switch tubes; the filtering link comprises filtering inductors and a filtering capacitor; and each high frequency link unit corresponds to one filtering inductor. The new DC-to-AC circuit is provided aimed at a transformer-free type grid-connected photovoltaic inverter, each phase of inversion voltage output includes paths of interlaced three-level pulses, and the output filtering inductance and capacitance are reduced; the utilization rate of low-frequency power switching devices is improved, and electromagnetic interference and the switching loss of the power switching devices are reduced; and higher conversion efficiency and power density and lower cost are realized, and the power capacity of the system is easy to expand.

Description

technical field [0001] The invention belongs to the technical field of new energy grid-connected power generation, and relates to a circuit for converting DC voltage into AC voltage, in particular to a three-level multi-pulse output transformerless inverter circuit. Background technique [0002] As an important part of new energy, solar power has been developing more and more. In the solar power generation system, the inverter conversion circuit that converts the direct current generated by the solar panel into alternating current is the core of the solar power generation system and plays a very important role. [0003] Solar energy systems can usually be divided into independent type and grid-connected type. The latter is the main application type of photovoltaic system at present because it can make the most of the energy emitted by solar panels. Inverter topologies can generally be classified into transformer-isolated and transformerless. Isolation transformers can real...

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): H02M7/483H02M1/12
CPCH02M1/126H02M7/483Y02E10/56
Inventor 张玉林胡伟朱国忠徐锡军
Owner SHANGHAI CHINT POWER SYST