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

Inverter load detection device and method based on virtual impedance

A technology of virtual impedance and load detection, applied in the direction of electric power measurement through current/voltage, etc., can solve the problems of high output harmonic content, difficult high-order harmonic compensation, and low compensation accuracy.

Active Publication Date: 2016-06-15
ZHANGZHOU KEHUA TECH CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are harmonics in the output voltage of the inverter, which will generate certain high-order harmonics and reactive power on the output filter capacitor. The above-mentioned technical measures are difficult to eliminate such effects
In particular, when the load of the inverter is a nonlinear load (such as RCD load), the output harmonic content is high, the reactive power of the filter capacitor is large, it is difficult to compensate for high-order harmonics, and the compensation accuracy is not high, the output Load detection accuracy is poor

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
  • Inverter load detection device and method based on virtual impedance
  • Inverter load detection device and method based on virtual impedance
  • Inverter load detection device and method based on virtual impedance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] This embodiment provides an inverter load detection device based on virtual impedance, which is characterized in that it includes: an inverter module, an inductor current sampling circuit, an output voltage sampling circuit, a virtual impedance circuit, an operational amplifier, A CPU processor; the inverter module includes a DC / AC module and a filter circuit, the filter circuit includes a filter inductor L and a filter capacitor C, and the filter circuit is connected to both ends of the output of the DC / AC module; The input terminal of the output voltage sampling circuit is connected to the inverter module, the output of the output voltage sampling circuit is connected to the input terminal of the virtual impedance circuit; the output of the virtual impedance circuit is connected to the negative input terminal of the operational amplifier; the in...

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 an inverter load detection device based on virtual impedance, which comprises an inverter, an output voltage sampling circuit, an inductance current sampling circuit, a virtual impedance circuit, an operational amplifier and a CPU processor. An inverter load detection method based on virtual impedance, which uses virtual impedance to compensate the inductor current with the output voltage, and indirectly obtains the inverter output load current, thereby eliminating the influence of harmonics on compensation accuracy, especially in nonlinear When the load is on, the detection accuracy of the inverter output load power current is high. This technology overcomes the disadvantage of low detection accuracy of the existing capacitive reactive power compensation method when the output harmonic content is high.

Description

technical field [0001] The invention relates to an inverter load detection device and a method thereof, in particular to a virtual impedance-based inverter load detection device and a method thereof. Background technique [0002] In the inverter, in order to ensure closed-loop stability, wide load adaptability, and reliable power tube protection, inductor current feedback is generally added; at the same time, in order to display the output load power in real time and avoid inverter overload or overheating damage, load power is also added. detection and overload protection. [0003] In order to ensure that load power detection is accurate enough for some inverters in the prior art, see figure 1 As shown, two current detection elements are used to detect the inductor current and the output load current respectively, but this will inevitably increase the cost and complicate the circuit structure. [0004] Other inverters omit the output load current detection components in or...

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 Patents(China)
IPC IPC(8): G01R21/06
Inventor 王志东苏先进刘艺超钟小帆
Owner ZHANGZHOU KEHUA TECH CO LTD
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