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Non- synchronous sampling for reactive power and harmonic algorithm under

Author: QiuHaiFeng
Tutor: ZhouHao
School: Zhejiang University
Course: High Voltage and Insulation Technology
Keywords: Power system Reactive power Harmonic Analysis Asynchronous sampling Non-sinusoidal
CLC: TM711
Type: Master's thesis
Year: 2008
Downloads: 103
Quote: 1
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Abstract


Existing measuring reactive energy meter design principles are based on the assumption of sinusoidal periodic voltage and current signals , the theoretical basis of sinusoidal circuit power theory , the type of energy meter is only applicable to the measurement of supply voltage and current waveforms without distortion linear load electricity. In this case, the sinusoidal circuit power theory gradually showing a suited. The paper studies the harmonic reactive power measurement algorithm and non- synchronous sampling algorithm . Reactive power measurement in power system has an important position and role . This article is divided sinusoidal and non - sinusoidal two cases discussed , including the formula method , the phase shift method , including improved shift -phase method , integration method , several mainstream reactive power measurement methods , the accuracy of existing methods and error analysis explore the coping strategies of the various methods of error . And briefly describes the hardware and software of various methods to achieve feasibility . The harmonic measurement focuses on the application of the the windowed interpolation method and the quasi-synchronous method in parameter estimation of power system harmonics . First , the analysis of the main reasons of the the asynchronous sampling FFT algorithm spectral leakage . Then explore the characteristics of commonly used window function is given based on the amplitude and frequency estimation formula Hanning and Blackman windows . Based on the basic principle of the quasi-synchronous method , and gives the amplitude calculated . Simulation results show that : reactive power measurement method of four integrated sine circuit case , in the case of small voltage and current harmonic content , the above four methods to achieve better accuracy . Finally, their frequency and phase characteristics , and analyzed on the accuracy and reliability of the algorithm . The three harmonic measurement methods can significantly reduce spectral leakage . Finally, the combination of precision , error frequency characteristics and sexual comparison algorithm is easy to implement , and gives recommendations for the practical use of several algorithms . Finally, the combination of low voltage reactive power compensation project focuses on the hardware implementation of the system of measurement of harmonics and reactive , made ??an introduction of the actual reactive and harmonic measurement .

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Theory and Analysis > Network analysis,power system analysis
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