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

Voltage control method for single-phase cascaded converter

A voltage control method and voltage control technology are applied in the field of multi-level converters, which can solve problems such as unfavorable system expansion and complex control schemes, and achieve the effect of improving dynamic performance.

Active Publication Date: 2022-03-01
YANSHAN UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the ports of the processor are fixed and there is an upper limit, the interconnection lines and control schemes between the H-bridge modules will become complicated as the number of cascaded H-bridges increases, which is not conducive to the system's high-power, multi-module level Linked to expand

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
  • Voltage control method for single-phase cascaded converter
  • Voltage control method for single-phase cascaded converter
  • Voltage control method for single-phase cascaded converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] Below in conjunction with embodiment the present invention is described in further detail:

[0043] Such as Figure 1 to Figure 10 As shown, a single-phase cascaded converter voltage control method includes the following steps:

[0044] Step 1: The circuit schematic diagram and control block diagram of the single-phase cascaded H-bridge rectifier are as follows figure 1, and control each H-bridge module separately. Set the first H-bridge module as the current control module, and the remaining H-bridge modules as the voltage control module. The current control module can not only control the grid-side current of the first H-bridge module, but also control the DC-side voltage of the module. The voltage control module only controls its DC side voltage.

[0045] Step 2: In the current control module, the DC side voltage value of the module is sampled by the subprocessor, and the DC side output voltage u of the module is sampled dc1 with a given DC voltage reference T...

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 voltage control method for a single-phase cascaded converter, which relates to the technical field of multi-level conversion and comprises the following steps of: enabling a first H-bridge module to be a current control module and the rest to be voltage control modules. When the H-bridge module is used as a rectifier, the current control module samples DC-side output voltage of the H-bridge module, compares the DC-side output voltage with a given DC voltage reference value, multiplies the DC-side output voltage with a grid-side voltage phase signal through the first PI regulator to obtain a grid-side current reference value, compares the grid-side current reference value with a grid-side current to obtain a current error signal, and outputs the current error signal through the second PI regulator. And the modulation ratio for controlling the H-bridge module is obtained. The voltage control module samples the DC side output voltage of the module and compares the DC side output voltage with a given DC voltage reference value to obtain a voltage error signal, the voltage error signal is multiplied by a network side voltage phase signal through a PI regulator, the modulation ratio for controlling the H-bridge module is obtained, and then a switching tube is driven to work. According to the invention, the direct-current side voltage can follow the given voltage, and the unit power factor operation of the grid-side system is ensured.

Description

technical field [0001] The invention relates to the technical field of multilevel current conversion, in particular to a voltage control method for a single-phase cascaded converter, which is used to control the voltage of the single-phase cascaded converter when the load is unbalanced. Background technique [0002] In recent years, with the continuous improvement of the voltage level of high-power high-voltage semiconductor switching devices, multi-level converter technology has also developed rapidly in terms of topology and control theory, and has gradually become key research object. Among them, the cascaded H-bridge converter, as a typical representative of multilevel converters, is widely used in power electronic transformers, reactive power compensation and active filtering and other fields. It is used as a rectifier, and it has attracted the attention of the industry due to its advantages of modularization, scalability, separate power supply for different DC links, ...

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): H02J3/18H02J3/26H01J1/14H02J5/00
CPCH02J3/18H02J3/26H01J1/14H02J5/00H02J2203/20Y02E40/30Y02E40/50
Inventor 王立乔陈旭晨范振宇
Owner YANSHAN UNIV
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