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The Application of DSP in Power System Harmonic Detection

Author: ZhangQiFu
Tutor: QiDong
School: Dalian University of Technology
Course: Theory and New
Keywords: Harmonic Detection FFT Active Power Filter DSP
CLC: TM935
Type: Master's thesis
Year: 2006
Downloads: 482
Quote: 4
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Abstract


In recent years, with an increasingly wide range of applications in the power electronic devices , the grid harmonic pollution is getting worse. The harmonic serious impact on power quality , and the normal operation of the equipment causing harmful effects . Harmonic treatment is imperative that the primary problem is that the harmonic detection and analysis . Fast Fourier Transform (FFT) power system harmonic analysis difficult to achieve synchronous sampling and truncated integer number of cycles , the resulting spectral leakage will affect the results of the harmonic analysis . Calculated through the windowed interpolation correction algorithm can improve the accuracy of the harmonic frequency, phase and amplitude . In this paper, polynomial approximation method to obtain the frequency and amplitude correction formula . These improvements can further reduce leakage and noise , improve the accuracy of harmonic analysis . In recent years, with the development of digital signal processing (DSP) technology , it is more and more inclined to adopt the DSP such a high-speed microprocessor to achieve harmonic detection and control . Compared with traditional analog technology , digital control without external independent multiplier , This will not only simplify the design , to eliminate inherent temperature drift of analog circuits and vulnerable to environmental interference problems , but also to improve the control precision , easy to implement advanced control and can reduce circuit cost , easy to maintain and upgrade , to achieve large-scale production . This paper introduced the DSP active power filter harmonic detection . System using TI's DSP chip TMS320F240 as the core controller , its internal integration of the A / D converter , general purpose timers , compare units , PWM circuit , capture unit , simplifying the circuit design , and improve reliability . Finally, through the simulation of the entire system in MATLAB , the simulation waveform show : In this paper, the improved FFT algorithm is feasible and effective DSP controller is introduced to solve the real-time harmonic detection and fast , high harmonic as well as the transient harmonics accurately detected.

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CLC: > Industrial Technology > Electrotechnical > Electrical measurement techniques and instruments > Frequency, waveform parameter measurement and instrumentation
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