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Research on Power Quality Detection Algorithm for Digital Substation

Author: DuanYiLong
Tutor: XiaoXiangNingï¼›JinWeiYu
School: North China Electric Power University (Beijing)
Course: Electrical Engineering
Keywords: Digital substation Power quality detection Fast Fourier algorithm Code optimization
CLC: TM63
Type: Master's thesis
Year: 2011
Downloads: 138
Quote: 0
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Abstract


With the substation to the continuous development of digital and intelligent, the function and structure of power quality monitoring equipment in the new environment ensued a lot of change, and this change had an impact on power quality detection algorithm. In order to solve a series of problems caused by these changes to the algorithm from the three aspects of the the harmonic fast algorithm, frequency detection algorithm and voltage, current, RMS detection algorithm and improved algorithm. The digital substation sampling changes in the way the 10-cycle data points into a fixed 2000 points. Due to changes in the number of points, whether it is the most common group 2-FFT algorithm or other factor FFT algorithm, there are sampling points do not match or the problem of low efficiency calculated to cause problems to the practical application of the harmonic analysis. To solve this problem, this paper analyzes the discrete Fourier algorithm, interpolation algorithm mixed base prime factor algorithm, Winograd and sequence of real numbers FFT algorithm's characteristics, and then based on these algorithms put forward a can quickly calculate the 2000 sampling points of the combination of FFT algorithm combined with practical engineering, the combination of FFT harmonic detection algorithm on the C6000 DSP. Simulation results and DSP experimental results show that the algorithm is superior in accuracy and speed of other fast algorithms, digital substation environment ideal harmonic detection algorithm. In order to improve the efficiency of the combined FFT algorithm running on the C6000 DSP the accuracy verification simulation platform way combination of FFT calculation results accuracy compared to floating-point and fixed-point data, and proposed a step-by-step for the combination of the FFT data said method, this method can guarantee the accuracy of the premise, to achieve the efficient operation of the combination of the FFT algorithm. C6000 series DSP calculation speed and code writing method is a direct relationship. In this paper, using the DSP code optimization method, the three links from external lines and code to optimize the combination of FFT algorithm, to achieve a combination of FFT algorithm in the DSP calculation speed increased dramatically. Frequency measurement algorithms for software, the paper analyzes the characteristics of existing software frequency measurement algorithm and the problems in the digital substation, proposed methods to eliminate the phase error by increase Fourier measured frequency algorithm to calculate the length of the window. The simulation results, this method can effectively improve the accuracy of the test results in the frequency offset. Existing rms compensation algorithm for voltage, current and RMS detection algorithm modified interpolation processing on the value of the fractional part of the calculation to solve the fractional part is small, the rms value larger error the problem to ensure the stability of the calculation results accuracy.

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CLC: > Industrial Technology > Electrotechnical > Power generation, power plants > Substation
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