Active filter harmonic current test delay time compensation method and system

A delay time and harmonic current technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problems of low operation efficiency, difficult to popularize and use, and high price of active power filters. To overcome the delay, the effect is good
CN1402406AInactive Publication Date: 2003-03-12TSINGHUA UNIV
0 Cites 17 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2003-03-12
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 belongs to the technical area of compensating the delayed time in the harmonic current detection. It is characterized by that it improves the conventional instant space vector method based on the theory of instant reactive power. When the coordinate transformation is carried out, the "delta" "theta" angle is added to the conversion matrix in order to compensate the delayed time, "delta" "theta"=n "omega" "delta" T here n is harmonic degree, "omega" is the angular frequency of the principal wave, "dlta" T is the delay time. Thus, the issue of the delayed time of the digital controller is solved. The invention realizes the real-time compensating the harmonic current, guarantees the compensation characteristic of the active filter as well as avoids the need of the device with high calculating speed so as to reduce the cost.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] A compensation method and system for delay time of active filter harmonic current detection belong to the technical field of active filter harmonic current compensation. Background technique

[0002] With the development of power electronic technology, power electronic devices are widely used, and the harmonic pollution of power grid caused by them is becoming more and more serious. Active power filter, as a device for effectively compensating power grid harmonics, has attracted people's attention.

[0003] The basic principle of the active power filter is to detect the harmonic current from the load current as the compensation object, and the compensation device generates a compensation current equal to the harmonic current and opposite in polarity, so that the grid current only contains the fundamental wave component. The principle is as follows: When the system needs to compensate the harmonic current generated by the load, the active power filter...

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