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System and method for harmonic detection and control of APF (active power filter) based on windowed all-phase FFT (fast Fourier transform)

A control system and harmonic detection technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, active power filtering, etc., can solve signal parameters that are frequency, amplitude and phase inaccurate, unable to Meet the harmonic measurement requirements of the power system, large phase errors and other problems, achieve the effect of solving inaccurate phase detection, improving calculation accuracy and real-time performance, and reducing energy leakage

Inactive Publication Date: 2012-12-19
TIANJIN UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

The traditional FFT detection method has fence effect and leakage phenomenon, which makes the calculated signal parameters such as frequency, amplitude and phase inaccurate, especially the large phase error, which cannot meet the accurate power system harmonic measurement requirements

Method used

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  • System and method for harmonic detection and control of APF (active power filter) based on windowed all-phase FFT (fast Fourier transform)

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Embodiment

[0040] Embodiment: a kind of APF harmonic detection and control system based on windowed all-phase FFT (see figure 1 ), including an AC power grid with a nonlinear load and an active current filter, characterized in that it includes a control module and a detection module, wherein the detection module includes a command current detection operation unit; the control module includes a main circuit unit , a PWM drive unit and a current tracking control unit; the input terminal of the command current detection operation unit detects the current signal of the load end in the grid, and its output terminal is connected with the input terminal of the current tracking control unit; the input terminal of the PWM drive unit is connected The output terminal of the current tracking control unit is connected to the input terminal of the main circuit unit; the output terminal of the main circuit unit outputs a compensation current signal to feed back to the grid.

[0041] The command current...

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Abstract

The invention relates to a system for harmonic detection and control of an APF (active power filter) based on windowed all-phase FFT (fast Fourier transform), which comprises an alternating-current power grid with a nonlinear load and an active current filter, and is characterized by also comprising a control module and a detection module. A working method comprises: signal detection, command triggering, pulse uttering and generation of compensating current. The system and the method have the advantages that (1), the system is simple and the cost is medium; (2) the frequency, the amplitude and the phase of the harmonic current can be detected in an accurate and real-time way, and the compensating performance of the APF can be guaranteed; (3) the accuracy and the real-time performance of calculation can be improved; and (4) the current tracking control effects of the APF can be improved.

Description

(1) Technical field: [0001] The invention belongs to the field of power quality control, in particular to an APF (Active Power Filter—Active Power Filter) harmonic detection and control system based on windowed all-phase FFT (Fast Fourier Transform—Fast Fourier Transform) and methods. (2) Background technology: [0002] In recent years, with the increasingly widespread use of power electronic devices and nonlinear loads, power quality has been effectively improved. However, with the continuous increase of various equipment such as converters, frequency conversion speed regulation, electric arc furnaces, electrified railways, and household electronic appliances in the distribution network, the power consumption characteristics of these loads (non-linear, impact and Asymmetry) causes serious distortion of voltage and current waveforms in the power system, forming serious harmonic problems. [0003] The traditional harmonic control and reactive power compensation method is to...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 周雪松陈广柱马幼捷
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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