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

Hybrid modular multilevel converter suitable for low frequency operation and control method thereof

A modularized multi-level and control method technology, applied in the field of power electronics, can solve problems such as capacitor voltage fluctuations, and achieve the effect of reducing capacitor voltage fluctuations and avoiding increased loss

Active Publication Date: 2016-08-31
HARBIN INST OF TECH
View PDF7 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of capacitor voltage fluctuations in MMC low-frequency operation, and the present invention provides a hybrid modular multi-level converter device and its control method suitable for low-frequency operation

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
  • Hybrid modular multilevel converter suitable for low frequency operation and control method thereof
  • Hybrid modular multilevel converter suitable for low frequency operation and control method thereof
  • Hybrid modular multilevel converter suitable for low frequency operation and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0042] Specific implementation mode one: combine figure 1 Describe this embodiment, the hybrid modular multi-level converter device and its control method suitable for low-frequency operation described in this embodiment, the principle is as follows figure 1 As shown, the converter device includes a series switch, a snubber circuit, a ground circuit and a modular multilevel converter;

[0043] The series switch is connected in series between the DC bus and the DC side of the modular multilevel converter, and the buffer circuit and the grounding circuit are respectively connected in parallel on the DC side of the modular multilevel converter;

[0044] The modular multilevel converter is composed of a three-phase circuit, each phase circuit includes two upper and lower bridge arms, each bridge arm is composed of an inductor L and N sub-modules SM with the same structure in series, each sub-module SM consists of a half-bridge power unit and a capacitor C.

[0045] Series switches...

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 hybrid modular multilevel converter suitable for low frequency operation and a control method thereof, belongs to the field of power electronics, and aims at solving the problems of capacitor voltage fluctuation in low frequency operation of a MMC. The converter device comprises a series switch, a buffer circuit, a grounding circuit and the modular multilevel converter. The series switch is connected in series between a DC bus and the DC side of the modular multilevel converter. The buffer circuit and the grounding circuit are respectively connected in parallel at the DC side of the modular multilevel converter. The modular multilevel converter is composed of three-phase circuits. Each phase of circuit is comprises upper and lower bridge arms. Each bridge arm is formed by one electric inductor L and N submodules SM of the same structure through series connection. Each submodule SM comprises a half-bridge power unit and a capacitor C. The hybrid modular multilevel converter is used for high-voltage motor variable-frequency speed regulation.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a hybrid modular multilevel converter suitable for low-frequency operation and a control method thereof. Background technique [0002] Modular multilevel converter (MMC), as a new type of high-voltage and high-power power conversion technology, has been widely used in the fields of flexible direct current transmission and power quality control in recent years. At the same time, people have also begun to study whether MMC can be applied in the field of frequency conversion and speed regulation of high-voltage motors. Because compared with the traditional cascaded H-bridge inverter, MMC not only retains most of its advantages (such as high efficiency, multi-level voltage output, modular structure, easy installation and maintenance), more importantly, it can save The phase-shifting transformers in the cascaded H-bridge inverters, which are expensive, bulky and have seri...

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
IPC IPC(8): H02M7/49H02M1/34
CPCH02M1/34H02M7/49
Inventor 徐殿国李彬彬周少泽石绍磊关明旭
Owner HARBIN 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