Time-Domain Signal Analysis Using Adaptive Notch Filter

Mojiri, M.; Karimi-Ghartemani, Masoud; Bakhshai, Alireza

doi:10.1109/tsp.2006.885686

Cited by 160 publications

(101 citation statements)

References 13 publications

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“…Moreover, the assumed norm-boundd on the output noise implies the existence of d η such thatd η > 0 : |d η (t)| ≤d η , ∀t ∈ R ≥0 . Now, we introduce the structure of the adaptive observer for joint estimation of z(t) and θ * in (15), and in turn estimating the frequenciesΩ i , i = 1, · · · , n. Besides the measured output filter (12), the architecture of the estimator also includes three dynamic components (16), (17) and (19), which are described below: 1) Augmented state estimator:…”

Section: Filtered-augmentation-based Adaptive Observermentioning

confidence: 99%

“…In [17] and [18], the AFP estimation of two independent sinusoidal components are addressed resorting to two PLL-based blocks with a decorrelator factor that specializes in discriminating two nearby frequencies. Following the preliminary work [19] concerning harmonically constructed signal with ANFs in parallel, an improved framework handling the n inter-harmonics is reported in [20] that is shown advantageous from a computational perspective with respect to the counterpart relying on multiple PLLs (see [21]). A variant of the OSG-TOGI scheme called adaptive frequency-locked-Loop (AFLL) filter based TOGI has been recently presented in [22], in which the explicit contents of the multi-sinusoidal signal can be tracked by deploying a bank of AFLL filters.…”

Section: Introductionmentioning

confidence: 99%

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An Adaptive-Observer-Based Robust Estimator of Multi-sinusoidal Signals

Chen

et al. 2018

IEEE Trans. Automat. Contr.

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Abstract-This paper presents an adaptive observer-based robust estimation methodology of the amplitudes, frequencies and phases of biased multi-sinusoidal signals in presence of bounded perturbations on the measurement. The parameters of the sinusoidal components are estimated on-line and the update laws are individually controlled by an excitation-based switching logic enabling the update of a parameter only when the measured signal is sufficiently informative. This way doing, the algorithm is able to tackle the problem of over-parametrization (i.e., when the internal model accounts for a number of sinusoids that is larger than the true spectral content) or temporarily fading sinusoidal components. The stability analysis proves the existence of a tuning parameter set for which the estimator's dynamics are input-to-state stable with respect to bounded measurement disturbances. The performance of the proposed estimation approach is evaluated and compared with other existing tools by extensive simulation trials and real-time experiments.

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Section: Filtered-augmentation-based Adaptive Observermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Adaptive-Observer-Based Robust Estimator of Multi-sinusoidal Signals

Chen

et al. 2018

IEEE Trans. Automat. Contr.

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“…The sample leakage current and notch filtered (50 Hz) [14] leakage noise measured from test set-up is given in Fig. 2.…”

Section: Signal Modelmentioning

confidence: 99%

Investigation of Degradative Signals on Outdoor Solid Insulators Using Continuous Wavelet Transform

Uzunoğlu¹

2016

Journal of Electrical Engineering and Technology

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-Most outdoor solid insulators may suffer from surface degradations due to non-stationary currents that flow on the insulator surface. These currents may be classified as leakage, discharge and tracking currents due to their disturbing potencies respectively. The magnitude of these currents depends on the degree of the contamination of surface. The leakage signals are followed by discharge signals and tracking signals which are capable of forming carbonized tracking paths on the surface between high voltage and earth contacts (surface tracking). Surface tracking is one of the most breakdown mechanisms observed on the solid insulators, especially polymers which may cause severely reduced lifetime. In this study the degradations observed on polyester resin based insulators are investigated according to the IEC 587 Inclined Plane Test Standard. The signals are monitored and recorded during tests until surface tracking initiated. In order to prevent total breakdown of an insulator, early detection of tracking signals is vital. Continuous Wavelet Transform (CWT) is proposed for classification of signals and their energy levels observed on the surface. The application of CWT for processing and classification of the surface signals which are prone to display high frequency oscillations can facilitate real time monitoring of the system for diagnosis.

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“…Although these systems have shown to be fast and accurate under balanced conditions its response is unacceptably deficient when the utility voltage is unbalanced. Different advanced synchronization systems, able to deal with this grid conditions, have been proposed as an alternative to SRF-PLL such as the decoupled double synchronous reference frame PLL (DDSRF-PLL), the three phase enhanced PLL (3PH-EPLL) and the dual second order generalized integrator resting on a frequency-locked loop (DSOGI-FLL) was proven to be an effective solution under adverse grid conditions [3]- [9].…”

Section: Introductionmentioning

confidence: 99%

“…Within this field a synchronization technique based on using adaptive notch filters for estimating multiple frequencies in a singlephase system was described in [9]. This paper proposes a new technique for detecting multiple frequency harmonics, with positive-and negative-sequences, in three-phase systems using an extended approach to that presented in [9].…”

Section: Introductionmentioning

confidence: 99%

Multiple second order generalized integrators for harmonic synchronization of power converters

Rodriguez

Luna

Etxeberria

et al. 2009

2009 IEEE Energy Conversion Congress and Exposition

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--This paper presents a new frequency-adaptive synchronization method for grid-connected power converters which allows estimating not only the positive-and negativesequence components of the power signal at the fundamental frequency, but also other sequence components at multiple frequencies. The proposed system is called the MSOGI-FLL since it is based on a decoupled network consisting of multiple second order generalized integrators (MSOGI) which are frequency-adaptive by using a frequency-locked loop (FLL). In this paper, the MSOGI-FLL is analyzed and its performance is evaluated by both simulations and experiments.

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Time-Domain Signal Analysis Using Adaptive Notch Filter

Cited by 160 publications

References 13 publications

An Adaptive-Observer-Based Robust Estimator of Multi-sinusoidal Signals

An Adaptive-Observer-Based Robust Estimator of Multi-sinusoidal Signals

Investigation of Degradative Signals on Outdoor Solid Insulators Using Continuous Wavelet Transform

Multiple second order generalized integrators for harmonic synchronization of power converters

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