A quadratic polynomial signal model and fuzzy adaptive filter for frequency and parameter estimation of nonstationary power signals |
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| Affiliation: | 1. KIIT University, Bhubaneswar, India;2. Siksha O Anusandhan University, Bhubaneswar, India;3. BITS, Dubai, United Arab Emirates;1. Echolight Srl, Lecce, Italy;2. National Research Council, Institute of Clinical Physiology, Lecce, Italy;3. ENEA, Materials Technology Unit, Research Centre of Brindisi, Brindisi, Italy;1. School of Mechanical Electronic & Information Engineering, China University of Mining & Technology, Beijing, China;2. China Academy of Machinery Science & Technology, Beijing, China;1. Department of Civil and Environment Engineering, Worcester Polytechnic Institute (WPI), Worcester, MA 01609-2280, USA;2. Department of Civil and Environmental Engineering, The University of Louisville, Louisville, KY 40292, USA;3. Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409-3102, USA;4. Department of Architectural Engineering, Yonsei University, Seoul, 120-749, South Korea |
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| Abstract: | Accurate estimation of amplitude, phase and frequency of a sinusoid in the presence of harmonics/inter harmonics and noise plays an important role in a wide variety of power system applications, like protection, control and state monitoring. With this objective, the paper presents a novel hybrid approach for the accurate estimation of dynamic power system frequency, phasor and in addition to suppressing the effect of harmonics/interharmonics and noise in the voltage and current signals. The algorithm assumes that the current during a fault occurring on a power system consists of a decaying dc component, and time variant fundamental and harmonic phasors. For accurate estimation of fundamental frequency, phasor, decaying dc and ac components in the fault current or voltage signal, the algorithm uses a quadratic polynomial signal model and a fuzzy adaptive ADALINE filter with a modified Gauss–Newton algorithm. Extensive study has been carried out to demonstrate the performance analysis and fast convergence characteristic of the proposed algorithm. The proposed method can also be implemented for accurate estimation of dynamic variations in the amplitude and phase angles of the harmonics and inter harmonics mixed with high noise conditions. |
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| Keywords: | ADALINE Fuzzy logic based step size Gauss–Newton method Frequency deviation Phasor estimation Power system transient |
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