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

Three phase on-line harmonic current real time monitoring system and working method thereof

A real-time monitoring system, a technology of harmonic current, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of inability to detect, small real-time calculation, and large calculation.

Inactive Publication Date: 2009-03-25
TIANJIN UNIVERSITY OF TECHNOLOGY
View PDF0 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The detection method based on instantaneous reactive power theory is a very common method. Its detection and compensation effect is relatively obvious, but it can only detect the harmonic components in the current, but cannot detect the harmonic components in the voltage, and the control circuit is relatively complicated. The amount of calculation is also large, so it has obvious limitations in systems with high real-time requirements; in addition, there are methods of using artificial neuron networks (ANN) to detect harmonics, which use analog parallel harmonics The basic principle of the wave detection device, but this method requires a lot of time to train the samples, and it is difficult to meet the real-time requirements; there are also traditional adaptive detection methods that have been applied, which are based on the principle of adaptive noise cancellation, and the system Closed-loop detection, so it has good robustness, small amount of real-time calculation, simple and fast, and its working characteristics are not affected by hardware device parameter changes and voltage waveform distortion. There are still very few application reports in the three-phase system. Even if there are related researches, it fails to solve the mutual restriction relationship between dynamic response speed and detection accuracy.
This relationship is that if the high detection accuracy of harmonic calculation is ensured, the dynamic response speed is very slow; if the dynamic response speed is increased, the detection accuracy will be significantly reduced

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
  • Three phase on-line harmonic current real time monitoring system and working method thereof
  • Three phase on-line harmonic current real time monitoring system and working method thereof
  • Three phase on-line harmonic current real time monitoring system and working method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] Embodiment: a kind of three-phase online harmonic current real-time monitoring system (see figure 1 ), which is characterized in that the hardware equipment of the system is composed of five parts: a signal preprocessing module, a three-phase adaptive harmonic detection and processing module, a reference quadrature signal generation module, a detection signal processing module, and a computer analysis and display module; The input terminal of the said signal preprocessing module is connected to the current signal to be detected, and the output terminal is connected to the output terminal of the three-phase adaptive harmonic detection processing module; the input terminal of the said three-phase adaptive harmonic detection processing module includes Two reference current input terminals, and these two reference current input terminals are connected to the output terminal of the reference quadrature signal generation module, the output terminal of the said three-phase adap...

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 a system for monitoring triphase online harmonic current in real time. The system comprises a power system, and is characterized by consisting of a signal pre-processing module, a triphase self-adaptive harmonic detection processing module, a reference orthogonal signal generating module, a detecting signal processing module and a computer analyzing and displaying module. The system has the advantages: (1) the system has stronger self-adaptability by combining space vector transformation; (2) an improved self-adaptive filter algorithm improves the system detection precision and the dynamic response characteristic; (3) the acquired waveform has synchronicity by detecting the three phases of harmonic current simultaneously and the system cost is saved; (4) active and reactive components of a fundamental wave can be detected simultaneously so as to facilitate the compensation of the reactive current components;(5) the influence of waveform distortion is avoided by adopting a phase lock loop to generate voltage;(6) the system detection precision and the dynamic response property are improved by connecting a low pass filter in series; and (7) the system adapts to the detection of voltage components as well.

Description

(1) Technical field: [0001] The invention relates to the field of harmonic current monitoring, in particular to a three-phase on-line harmonic current real-time monitoring system and a working method thereof. (two) background technology: [0002] At present, the application prospects of active power filters in power systems are increasingly optimistic, and the harmonic current detection method adopted by them has become very important, because this determines the detection accuracy and dynamic response characteristics of harmonic currents, and is more direct Affect the compensation effect of harmonic current. Therefore, whether the harmonics and reactive components in the system can be quickly and accurately detected in real time and monitored is a prerequisite for the successful application of active power filters. [0003] The detection method based on instantaneous reactive power theory is a very common method. Its detection and compensation effect is relatively obvious,...

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): G01R19/00
Inventor 周雪松周永兵马云斌邵宝福马幼捷尹向前许立瑾张书瑞
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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