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Stipulated secondary compensation method for multi-period parallel repetitive control of harmonic and inter-harmonic

A technology of repetitive control and compensation method, applied in AC network to reduce harmonic/ripple, active power filter, measurement device, etc., can solve the problem of error, poor robustness, and PI controller can not achieve no static error Control and other issues

Inactive Publication Date: 2018-01-16
SHANDONG UNIV OF SCI & TECH +1
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  • Claims
  • Application Information

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Problems solved by technology

However, the conventional PI controller cannot achieve no static error control, and there are errors
Although the use of controllers such as repetitive control improves the compensation accuracy, it has the characteristics of poor robustness. When the external system disturbance is large, it is easy to cause system instability.

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  • Stipulated secondary compensation method for multi-period parallel repetitive control of harmonic and inter-harmonic
  • Stipulated secondary compensation method for multi-period parallel repetitive control of harmonic and inter-harmonic
  • Stipulated secondary compensation method for multi-period parallel repetitive control of harmonic and inter-harmonic

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Embodiment Construction

[0074] The solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0075] A multi-period parallel repetitive control harmonic and inter-harmonic specified order compensation method, such as figure 1 shown, including the following steps:

[0076] Step 1, such as figure 2 As shown, a three-level shunt active power filter is set in the power grid, and it is used to detect the three-phase current signal i in the power grid a i b i c and three-phase voltage signal e a 、e b 、e c (because e a = e b = e c , with e a represents the three-phase voltage).

[0077] Step 2. For the three-phase current signal i a i b i c and three-phase voltage signal e a Perform time-domain average processing to obtain the component i of the three-phase current after filtering out DC and interference ah i bh i ch And voltage d, component e of q axis d 、e q .

[0078] After the original current and voltage sig...

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Abstract

The invention relates to a stipulated secondary compensation method for multi-period parallel repetitive control of harmonic and inter-harmonic. The method comprises the steps of detecting a three-phase current signal and a three-phase voltage signal in a power grid by a three-level parallel active power filter; performing time domain average processing to obtain a component of a three-phase current after a direct current and interference are filtered and components of voltage d axis and q axis; filtering a current fundamental component by a lowpass filter; respectively extracting a harmonic signal and an inter-harmonic signal by a harmonic detection module and an inter-harmonic detection module; and inputting an instruction signal to a compensation control system, inputting an output compensation signal to a three-level space vector pulse width modulator (SVPWM), driving a power electronic device in the three-level parallel active power filter to be switched on / off, and generating anexpected waveform compensation power grid. The harmonic and the inter-harmonic in the power grid are detected by employing the time domain average method, the harmonic and the inter-harmonic are compensated by employing a mode of combining PI control and multi-period parallel repetitive control, and the reliability and the compensation accuracy of the method are improved.

Description

technical field [0001] The invention relates to the technical field of grid harmonic detection and compensation, in particular to a multi-period parallel repetitive control harmonic and inter-harmonic specified order compensation method. Background technique [0002] In the three-phase power grid, power electronic equipment such as high-voltage DC transmission devices, electric arc furnaces and frequency converters generate a large number of inter-harmonic currents in addition to harmonic currents. The existence of harmonics and inter-harmonics leads to a decrease in the operating efficiency of the power grid, and may also cause voltage fluctuations and flicker in the power grid. In order to eliminate the influence of harmonics and inter-harmonics, many researches have been done on the detection and compensation of harmonics and inter-harmonics at home and abroad. At present, the main detection methods are detection methods based on frequency domain, detection methods based...

Claims

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Application Information

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IPC IPC(8): H02J3/01G01R23/165
CPCY02E40/20
Inventor 张超
Owner SHANDONG UNIV OF SCI & TECH
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