Parallel active filter based on modularization multi-level converter and control method of parallel active filter

A modular multi-level, source filter technology, applied in active power filtering, conversion of AC power input to DC power output, electrical components, etc., can solve problems such as poor power quality in distribution networks

Active Publication Date: 2014-03-26
HARBIN INST OF TECH
View PDF4 Cites 53 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing parallel active filter cannot effectively perform harmonic combination compensation,

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
  • Parallel active filter based on modularization multi-level converter and control method of parallel active filter
  • Parallel active filter based on modularization multi-level converter and control method of parallel active filter
  • Parallel active filter based on modularization multi-level converter and control method of parallel active filter

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0063] Specific implementation mode one: the following combination figure 1 and figure 2 Describe this embodiment mode, the parallel active filter based on modular multilevel converter described in this embodiment mode, it comprises modular multilevel converter 1, and described modular multilevel converter 1 is half-bridge type Topological structure, the upper and lower bridge arms of each phase include n sub-modules SM n , n is a positive integer; it also includes a current conversion unit 2, a harmonic current detection unit 3, a current controller 4, a capacitor C and a grid reactance L S ,

[0064] The capacitor C is connected between the common point +p of the three-phase upper bridge arm and the common point -n of the three-phase lower bridge arm on the DC side of the modular multilevel converter 1;

[0065] Grid reactance L S Connected between the three-phase AC power grid and the three-phase nonlinear load, the output common point PCC of the modular multilevel con...

Example Embodiment

[0069] Specific implementation mode two: the following combination figure 2 Describe this embodiment, this embodiment will further explain Embodiment 1, the n sub-modules SM described in this embodimentn Each sub-module includes two IBGT tubes, each IGBT tube is connected with a diode in antiparallel, and an energy storage capacitor is connected in series between the collector of the upper side IBGT tube and the emitter of the lower side IBGT tube, modular multilevel converter AC reactor L connected in series between the n submodules of the upper and lower bridge arms of each phase of 1 and the grid current injection terminal of the corresponding phase 0 .

[0070] In this embodiment, the AC bus side of the modular multilevel converter 1 does not need a filter inductor, which saves space and cost. AC reactor L 0 The three-phase circulating current caused by the difference of DC voltage between the bridge arms of each phase of the modular multilevel converter 1 can be suppre...

Example Embodiment

[0071] Embodiment 3: This embodiment further explains Embodiment 1 or 2. The three-phase nonlinear load described in this embodiment is an RL type three-phase uncontrolled six-pulse rectifier bridge.

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 parallel active filter based on a modularization multi-level converter and a control method of the parallel active filter and belongs to the technical field of power harmonic suppression in a medium-high voltage high-power occasion. The problem that an existing parallel active filter cannot carry out harmonic combination compensation effectively, so that power distribution network electric energy quality is poor is solved. The filter comprises the modularization multi-level converter, a current transformation unit, a harmonic current detecting unit, a current controller, a capacitor C and a power grid electric reactor LS. The modularization multi-level converter is of a half-bridge-type topological structure, and an upper bridge arm and a lower bridge arm of the modularization multi-level converter respectively comprise n submodules SMn. According to the control method, a carrier phase-shifting modulation method is used, so that under the same switch frequency, equivalent switch frequency is high, switching loss is reduced, meanwhile, a capacitive coupling voltage sharing and ring current suppression strategy is used, and capacitor voltages and direct current bus voltages of the submodules are kept stable. The parallel active filter is used for harmonic suppression of a power grid.

Description

technical field [0001] The invention relates to a parallel active filter based on a modular multilevel converter and a control method thereof, and belongs to the technical field of power harmonic suppression for medium-high voltage and high-power occasions. Background technique [0002] With the rapid development of modern industry, the non-linear loads in the medium-voltage power distribution network are increasing day by day, and the increase of non-linear load devices will cause the power quality of the distribution network to become very bad, causing waveform distortion, reactive power fluctuation and imbalance . Therefore, in order to obtain reliable power supply quality, these power quality problems must be effectively managed. [0003] Passive filters are still the main means of harmonic suppression in medium-voltage power distribution networks, and their own shortcomings determine that they will be gradually replaced by filter devices based on power electronics tech...

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): H02J3/01H02M7/483
CPCY02E40/20Y02E40/40
Inventor 武健刘瑜超徐殿国徐修林冯宇哲
Owner HARBIN INST OF TECH
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

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap