Harmonic current detection method applied to stationary coordinate system of APF

A static coordinate system, harmonic current technology, applied in the direction of only measuring current, measuring current/voltage, measuring device, etc., can solve the problem of not considering the phase advance correction of command current, achieve simple structure, improve harmonic compensation effect, Easy to execute effects

Active Publication Date: 2018-06-29
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
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Problems solved by technology

However, the traditional harmonic detection method usually does not consider the phase lead correction of the command current when it is designed.

Method used

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  • Harmonic current detection method applied to stationary coordinate system of APF
  • Harmonic current detection method applied to stationary coordinate system of APF
  • Harmonic current detection method applied to stationary coordinate system of APF

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Embodiment Construction

[0021] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0022] A method for detecting harmonic currents in a static coordinate system applied to an APF, comprising the following steps:

[0023] Step (1): If figure 1 , the current sensor collects the three-phase load current, and its output passes through the Hall current sensor. The output signal of the Hall current sensor is input to the built-in AD of the digital signal processor (DSP) through the conditioning circuit, and the built-in AD of the DSP converts the analog Converted into the corresponding digital quantity, and then converted into the actual value i of the corresponding three-phase load current la (k), i lb (k), i lc (k); k means kT s The moment is the sampling value at the current moment;

[0024] Step (2): If figure 1 , three-phase load current i la (k), i lb (k), i lc (k) After Clarke transformation, get i lα (k), i lβ (...

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Abstract

The invention discloses a harmonic current detection method applied to a stationary coordinate system of an APF (Active Power Filter), and belongs to the technical field of harmonic detection and treatment. In order to improve the accuracy of harmonic detection and the flexibility of harmonic compensation, the invention provides a complex bandpass filter with a phase advance correction function, and provides a design method and an execution process of the filter in detail; the harmonic current detection method disclosed by the invention does not need a phase-locked loop, a rotating coordinatetransformation or an inverse transformation, can be directly executed in the stationary coordinate system, is simple in principle and easy to implement, and can realize accurate detection of a specified phase sequence and a specified subharmonic.

Description

technical field [0001] The invention relates to a harmonic current detection method in a static coordinate system applied to an active power filter (APF), and belongs to the technical field of harmonic detection and control. Background technique [0002] With the application of a large number of nonlinear loads, the problem of harmonics in distribution network becomes increasingly prominent. Compared with passive filters, active power filters (APF) have the advantages of small size, good compensation effect, and not easy to cause system resonance, etc., and have been recognized as an effective means of harmonic control. [0003] Harmonic detection is the basis and premise of APF for harmonic control. The quality of harmonic detection methods directly affects the harmonic compensation effect of APF, and its importance is self-evident. The commonly used harmonic detection method in engineering is the specified sub-harmonic detection method based on phase-locked loop and rotat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/0092
Inventor 梁营玉许冠军王聪
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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