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

Specified subharmonic compensation method of hybrid active filter

A technology of source filter and compensation method, applied in AC network to reduce harmonic/ripple, output power conversion device, electrical components, etc., to reduce calculation amount, reduce inverter capacity, and avoid grid parameter drift Effect

Pending Publication Date: 2022-06-28
慈溪市输变电工程有限公司 +1
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the prior art cannot simply and stably compensate the specified order harmonic, the present invention provides a method for compensating the specified order harmonic of the hybrid active filter, by combining the active Part of the control is equivalent to a virtual capacitor to achieve the effect of a multi-tuned filter, and can overcome the influence of grid frequency drift and L, C parameter errors

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
  • Specified subharmonic compensation method of hybrid active filter
  • Specified subharmonic compensation method of hybrid active filter
  • Specified subharmonic compensation method of hybrid active filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0033] A specified harmonic compensation method for a hybrid active filter, comprising the following steps:

[0034] Sampling the voltage across the capacitor C in the LC single-tuned filter of the hybrid active filter to obtain the capacitor voltage v c ; to capacitor voltage v C Perform harmonic component extraction to obtain its harmonic voltage component v Ch.i , where i∈G, G is the specified sub-harmonic set, the typical value is G={5,7,11,13…};

[0035] According to the obtained harmonic voltage components, the output reference voltage control rate of the voltage source inverter of the hybrid active filter for the i-th harmonic compensation is set to v h.i =λ i ·v Ch.i , where v h.i is the i-th component of the output reference voltage of the voltage source inverter; λ i is the control parameter of active tuning for the i-th harmonic, and its size is adaptively adjusted by the disturbance observation method, then the output reference voltage of the voltage source i...

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 specified sub-harmonic compensation method for a hybrid active filter, and the method enables a voltage source inverter to be simulated into a virtual capacitor in a harmonic domain, and the capacitance value of the voltage source inverter can be adaptively adjusted through a perturbation observation method, so that an LC filter and the virtual capacitor can generate series resonance at the specified sub-harmonic frequency, and the harmonic compensation precision is improved. The effect of a multi-tuned filter is achieved, so that the filtering characteristic of the LC single-tuned filter is greatly improved; the control method has the advantages of being simple in control structure, easy to implement and good in filtering effect.

Description

technical field [0001] The invention relates to the field of harmonic compensation for power quality control, in particular to a specified harmonic compensation method for a hybrid active filter. Background technique [0002] The continuous growth and application of power electronic devices such as nonlinear loads and distributed power sources have brought serious harmonic pollution to the power system. Harmonics will reduce power quality, affect the reliability of power grid operation, cause line energy loss and endanger equipment safety and so on. The traditional method of controlling harmonic pollution in power system mainly adopts passive power filter (PPF). The PPF is generally composed of a single-tuned or multiple-tuned LC filter, which achieves the purpose of harmonic filtering by providing a low-impedance path for specific harmonic currents. Although PPF has the advantages of low cost and high efficiency, it also has some inherent disadvantages, such as grid frequ...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02M7/537H02M1/088
CPCH02J3/01H02M7/537H02M1/088
Inventor 童灵华沈科炬童可君余金伟张益军罗立华高栋寅胡科杰郑思航
Owner 慈溪市输变电工程有限公司
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