LCL-type active power filter and control method thereof

A technology of power filter and control method, which is applied in the direction of active power filter and AC network to reduce harmonics/ripples, etc., and can solve problems affecting output current control, complex control of LCL network resonance characteristics, and difficulty in consistent command values. , to achieve the effect of improving the filtering effect

Active Publication Date: 2017-03-22
XI AN JIAOTONG UNIV
View PDF4 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Compared with the traditional L-type active filter, the LCL-type active filter can take into account the low-frequency gain and high-frequency attenuation, which is the development direction of the active filter, but the high-order characteristics of the LCL filter make it resonant The problem
It affects its control of the output current, making it difficult to k

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
  • LCL-type active power filter and control method thereof
  • LCL-type active power filter and control method thereof
  • LCL-type active power filter and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] The control method of the LCL type active power filter of the present invention can be applied to single-phase and three-phase systems. Now take the single-phase system as an example to illustrate its specific control method.

[0039] Single-phase LCL type active power filter circuit topology such as figure 1 , consisting of a single-phase converter T1, a DC capacitor C, and a filter inductor L on the converter side 1 , Grid side filter inductance L 2 , filter capacitor C f , Converter side filter inductor current sampling circuit, filter capacitor voltage sampling circuit, DC capacitor voltage sampling circuit, load current sampling circuit and control circuit. One side of the single-phase converter T1 is connected in parallel with a DC capacitor C, and the other side is an LCL filter circuit, including a filter capacitor C f , the converter T1 side is connected to the filter inductor L 1 ; The grid side is connected to the filter inductance L 2 ; The control sys...

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 an LCL-type active power filter and a control method thereof. The LCL-type active power filter comprises a converter T1 and a control system, wherein one side of the converter T1 is connected in parallel with a DC capacitor C, an LCL filter circuit is arranged at the other side of the converter T1 and comprises a filter capacitor Cf, a converter T1 side is connected with a filter inductor L1, a power grid side is connected with a filter inductor L2, the control system is connected with an output end of the single-phase converter T1, the filter capacitor Cf, the DC capacitor C and a load respectively by a filter inductor L1 current sampling circuit, a filter capacitor voltage sampling circuit, a DC capacitor voltage sampling circuit and a load current sampling circuit, and the control system is used for closed-ring control on a current of the inductor L1 at the converter T1 side. According to the control method of the LCL-type active power filter, a filtering effect of the LCL-type active power filter can be improved by introducing virtual impedance control and phase compensation control.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of active filters, in particular to an LCL type active power filter and a control method thereof. [0003] 【Background technique】 [0004] The active filter uses the output current of the converter to compensate the load harmonic current to realize the filtering function. This requires the output current of the active filter to meet two conditions, one is that the amplitude is equal to the amplitude of the compensated harmonic current; the other is that the phase is opposite to the phase of the compensated harmonic current. Therefore, it has high requirements for current control. [0005] Compared with the traditional L-type active filter, the LCL-type active filter can take into account the low-frequency gain and high-frequency attenuation, which is the development direction of the active filter, but the high-order characteristics of the LCL filter make it resonant The problem. It affects its con...

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): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 雷万钧聂程陈明锋王华佳王跃
Owner XI AN JIAOTONG UNIV
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