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Appointed sub-harmonic detection and compensation method with reactive compensation function

A compensation method and sub-harmonic technology, applied in the directions of reactive power compensation, reactive power adjustment/elimination/compensation, harmonic reduction devices, etc., can solve problems such as increasing algorithm complexity, and enhance system stability and reliability. , The detection method is simple, the effect of good control

Active Publication Date: 2015-07-22
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

The 6k+1 order harmonic is defined as the positive sequence harmonic quantity, and the 6k-1 order harmonic is defined as the negative sequence harmonic component, and thus the positive sequence abc-dq, dq-abc transformation matrix and negative sequence dq are respectively proposed -abc, dq-abc transformation matrix, which increases the complexity of the algorithm

Method used

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  • Appointed sub-harmonic detection and compensation method with reactive compensation function
  • Appointed sub-harmonic detection and compensation method with reactive compensation function
  • Appointed sub-harmonic detection and compensation method with reactive compensation function

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specific Embodiment approach

[0026] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0027] Step 1: The three-phase phase-locked loop locks the phase and frequency of the voltage fundamental wave to obtain the frequency and phase of the three-phase voltage, and obtains the reference phase and frequency of the nth harmonic through the n-time frequency method;

[0028] Step 2: Taking the phase and frequency of the nth harmonic obtained in Step 1 as a reference, the distorted load current i Labc Carry out the rotation coordinate transformation under n-fold frequency, and its coordinate transformation matrix is

[0029] P n = 2 3 cos n ( ωt ) cos n ...

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Abstract

The invention provides an appointed sub-harmonic detection and compensation method with a reactive compensation function. Any sub-harmonic of harmonic current, generated by load in a power grid, is subjected to separated detection and compensation by abc-dq and dq-abc rotary coordinate conversion matrixes, and does not need to be subjected to calculation and detection respectively under the coordinate conversion of positive and negative sequences. According to the appointed sub-harmonic current detection method, the harmonic can be detected and compensated in a targeted manner and the method has the reactive compensation; the detection method is simpler and clearer. The compensation current can be controlled very well, and the control is easier to control. The system stability and reliability can be enhanced.

Description

technical field [0001] The invention relates to a specified harmonic detection and compensation method with reactive power compensation, belonging to the field of harmonic detection and harmonic control. Background technique [0002] With the rapid development of the economy, power electronic conversion devices have been widely used in the industrial field, making the harmonic pollution of the power grid more and more serious. The active power filter (APF) is recognized as the A new type of power electronic device for dynamically suppressing harmonic pollution of power grid, which can dynamically compensate harmonic current and reactive current whose amplitude and frequency change in real time. [0003] In order to compensate the harmonic current well, it is necessary to require the detection of harmonic current to be fast and accurate at the same time, that is, the harmonic detection technology with good real-time and dynamic performance is an important prerequisite for the...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/01
CPCH02J3/01H02J3/18Y02E40/30Y02E40/40
Inventor 舒泽亮周琪俊张自伟秦臻何晓琼
Owner SOUTHWEST JIAOTONG UNIV
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