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

A Modular Multilevel AC-DC Conversion System

A modular multi-level, DC conversion technology, applied in the field of AC-DC conversion systems, can solve the problems of low integration, high cost, large size, etc., and achieve the effects of high integration, compact cost, and easy engineering implementation.

Active Publication Date: 2022-08-02
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, a modular multi-level AC-DC conversion system provided by the present invention overcomes the defects of low integration, large volume and high cost of the AC-DC conversion system in the prior art

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
  • A Modular Multilevel AC-DC Conversion System
  • A Modular Multilevel AC-DC Conversion System
  • A Modular Multilevel AC-DC Conversion System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The modularized multi-level AC-DC conversion system provided by the embodiment of the present invention can be used for AC voltage transformation of a medium and low voltage distribution network system. image 3 As shown, it includes: a controller, multiple sub-module units, isolation transformers, and DC support capacitors, wherein the DC side of each sub-module unit is connected in parallel with a DC support capacitor, and the output of the DC support capacitor forms the DC end of the conversion system; The AC side of each sub-module unit is connected to the output terminal of an isolation transformer, and the input terminals of the isolation transformer are connected in series to form the AC terminal of the conversion system; the controller collects the AC side current and the capacitor voltage of each sub-module unit, and outputs the power devices of all sub-module units. Trigger signal for AC power control, AC output voltage control, DC support capacitor average vol...

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 modularized multi-level AC-DC conversion system, comprising: a controller, a plurality of sub-module units, an isolation transformer, and a DC support capacitor. The DC side of each sub-module unit is connected in parallel with a DC support capacitor, and the DC The output of the support capacitor forms the DC terminal of the conversion system; the AC side of each sub-module unit is connected to the output terminal of an isolation transformer, and the input terminals of the isolation transformer are connected in series to form the AC terminal of the conversion system; the controller collects the AC side current and each sub-module unit. Capacitor voltage, output the trigger signal of power devices inside all sub-module units, used for AC power control, AC output voltage control, DC support capacitor average voltage control, DC output voltage control and sub-mode capacitor voltage equalization control. The system provided by the invention has the characteristics of high integration, compactness and low cost, is easy to implement in engineering, and can be suitable for high-voltage large-capacity and medium-low-voltage small-capacity applications.

Description

technical field [0001] The invention relates to the field of AC-DC conversion systems, in particular to a modularized multi-level AC-DC conversion system. Background technique [0002] Modular multi-level AC-DC converters are widely used in power conversion fields such as flexible DC transmission systems, DC distribution network systems, and medium-voltage motor control. Among them, the most widely used half-bridge modular multi-level converter is converter (Modular Multilevel Converter, MMC) and cascaded full-bridge converter (Cascaded H-bridge Converter, CHC), the electrical topology such as figure 1 and 2 shown. At this stage, most of the flexible DC transmission projects and DC distribution network projects around the world use MMC converter solutions, such as the Trans Bay Cable ±200kV project in the United States, Xiamen ±320kV flexible DC project, and Shanghai 220kV Unified Power Flow Controller (UPFC). Engineering and Suzhou DC distribution network project, etc. ...

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): H02J3/36H02M7/797
CPCH02J3/36H02M7/797Y02E60/60
Inventor 王新颖贺之渊魏晓光庞辉李强吕铮客金坤白建成许航宇
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD