Novel control method for parallel active power filter

A power filter and control method technology, applied in active power filtering, electrical components, circuit devices, etc., can solve problems such as harmonic frequency bandwidth, unfavorable control system design, etc., to achieve easy protection, simple structure and control, and easy design effect

Inactive Publication Date: 2017-06-20
李福来
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional active power filter can compensate harmonics and reactive power at the same time, the disadvant

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
  • Novel control method for parallel active power filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] Such as figure 1 As shown, this embodiment provides a new control method for a parallel active power filter, which includes a transformer with low leakage reactance, a main circuit module, and a current pulse width modulation control and drive module , Fundamental current detection module.

[0014] The primary side of the transformer with low leakage reactance is connected in parallel with both ends of the power system and the harmonic source, and the fundamental wave voltage of the primary side of the transformer is detected. The method to reduce the leakage reactance is: 1) increasing the cross-sectional area of ​​the iron core to reduce the number of winding turns under the premise of the volume of the transformer; 2) reducing the thickness of the insulating layer between the primary and secondary windings of the transformer; 3) increasing the height of the winding; 4) The primary and secondary windings of the transformer are alternately wound.

[0015] The main ci...

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

A novel control method for a parallel active power filter can overcome the disadvantages of the wide frequency band of a traditional active power filter and the relative difficulty of an active power filter based on fundamental harmonic flux compensation. The primary side of a transformer with low leakage reactance is connected in parallel with a power system and a harmonic source to detect the fundamental voltage of the primary side of the transformer. The fundamental voltage is used as a reference signal. A fundamental voltage source is generated by a power electronic inverter to be applied to the secondary side of the transformer. The magnitude of the voltage source applied to the secondary side is adjusted so that the parallel transformer is equivalent to an adjustable reactor for the fundamental wave in order to achieve reactive power compensation, and is equivalent to low impedance for harmonics so as to automatically have a filtering effect. The control method is simple in system structure and control, convenient in protection, and easy to design, has multiple functions and can be used in a high voltage system.

Description

technical field [0001] The invention belongs to the field of harmonic suppression and reactive power compensation, and in particular relates to a novel control method based on a low leakage reactance transformer. Background technique [0002] In recent years, with the continuous development of power electronics technology, a large number of harmonics have been generated, affecting the power factor of the system, and the harmonics have greatly affected and harmed the surrounding electrical environment. The power system generally compensates the harmonics and improves the power factor by installing harmonic and reactive power compensation devices, which is commonly referred to as a power filter. [0003] As an effective device to suppress harmonic pollution and improve power quality, active power filter (APF) has become a research hotspot and has been widely used in electrified railways, power systems, photovoltaic grid-connected and other fields. Although the traditional act...

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): H02J3/01H02J3/18
CPCH02J3/01H02J3/1892Y02E40/20
Inventor 李福来
Owner 李福来
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