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.
CN101393237AInactive Publication Date: 2009-03-25TIANJIN UNIVERSITY OF TECHNOLOGY
0 Cites 9 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TIANJIN UNIVERSITY OF TECHNOLOGY
Publication Date
2009-03-25
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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