Advanced single-phase SOGI-FLL using self-tuning gain based on fuzzy logic

Park, Jin-Sang; Lee, Dong-Choon; Van, Tan Luong

doi:10.1109/ecce-asia.2013.6579274

Cited by 13 publications

(9 citation statements)

References 11 publications

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“…To take appropriate countermeasures, firstly these distortions must be identified as fast and precise as possible to protect users from malfunctioning equipment and to prevent destruction of electronic devices. Therefore, in the recent years, much effort has been put into this research question field which resulted in the development of Second-Order Generalized Integrators (SOGI)s [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12].…”

Section: Motivation and Literature Reviewmentioning

confidence: 99%

A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

Hackl¹

2020

Preprint

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A unified method is presented which allows to estimate all harmonic components, DC-offset and fundamen- tal frequency in arbitrarily distorted single-phase grids us- ing a frequency-adaptive observer (FAO) consisting of modi- fied Second-Order Generalized Integrators (mSOGIs), a DC- Integrator (DCI) and a modified Frequency Locked Loop (mFLL). DCI and mSOGIs are tuned by pole placement which allows for an arbitrarily fast detection of DC-offset and harmonic components if the fundamental frequency is known. If the fundamental frequency must be estimated as well, a mFLL with Gain Normalization (GN), Rate Limitation (RL), Anti-Windup (AW) strategy and low-pass filters (LPF) must be employed. The effectiveness of the proposed FAO is validated by experimental results and its enhanced performance is shown by comparisons to existing estimation methods.

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Section: Motivation and Literature Reviewmentioning

confidence: 99%

A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

Hackl¹

2020

Preprint

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“…MFs are plotted in Figure 3(b), (c), and (d). The DOM of the inputs can be illustrated as (Park et al., 2013): where ω is the width of the function amplitude, x is the input signal variable, and m is the coordinate of the point where DOM is equal to unity. Adjusting MFs and rules: when the inputs are fuzzificated, a DOM value can be assigned for each “if part” of rule (if part in every rule is called condition).…”

Section: Proposed Numerical Lpfmentioning

confidence: 99%

Performance improvement of DVR using a new numerical LPF based on VFF-RLS and fuzzy logic controller

Fallah

Kazemzadeh

Kojabadi

2017

Journal of Vibration and Control

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This paper deals with improving the technique of a dynamic voltage restore (DVR). The DVR is a dynamic solution to protect sensitive loads against voltage sags and swells. The DVR can be implemented to protect a group of medium- or low-voltage consumers. Various control methods are proposed to the DVR control, such as pre-sag, in-phase, and minimum energy compensation algorithms, etc. This study presents a modification of the pre-sag method of DVR control in which the steady state and transient response of the pre-sag method are improved. For this purpose, a numerical low pass filter (NLPF) based on a fuzzy logic controller (FLC) and recursive least squares with variable forgetting factor is proposed. The suggested NLPF is replaced instead of the conventional LPF in the pre-sag method structure of the DVR control. With this substitution the steady state and transient response of the DVR are improved. Simulation and experimental results verify the validity and good performance of the proposed method.

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“…To take appropriate countermeasures, firstly these distortions must be identified as fast and precise as possible to protect users from malfunctioning equipment and to prevent destruction of electronic devices. Therefore, in the recent years, much effort has been put into this research question which resulted in the development of Second-Order Generalized Integrators (SOGIs) [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16].…”

mentioning

confidence: 99%

A Unified Method for Generic Signal Parameter Estimation of Arbitrarily Distorted Single-Phase Grids With DC-Offset

Hackl

Landerer

2020

IEEE Open J. Ind. Electron. Soc.

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A unified method is presented which allows to estimate dc-offset, all harmonic components and fundamental frequency in arbitrarily distorted single-phase grids using a Frequency Adaptive Observer (FAO) consisting of modified Second-Order Generalized Integrators (mSOGIs), an adaptive DC-Integrator (DCI) and a modified Frequency Locked Loop (mFLL). DCI and mSOGIs are tuned by pole placement which allows for an arbitrarily fast detection of dc-offset and harmonic components if the fundamental frequency is known. If the fundamental frequency must be estimated as well, an mFLL with Gain Normalization (GN), Rate Limitation (RL), Anti-Windup (AW) strategy and low-pass filters (LPF) must be employed. The effectiveness of the proposed FAO is validated by experimental results and its enhanced performance is shown and compared to existing estimation methods. INDEX TERMS dc-offset estimation, frequency adaptive observer; frequency estimation; frequency locked loop; harmonics estimation; second-order generalized integrator.

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Advanced single-phase SOGI-FLL using self-tuning gain based on fuzzy logic

Cited by 13 publications

References 11 publications

A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

Performance improvement of DVR using a new numerical LPF based on VFF-RLS and fuzzy logic controller

A Unified Method for Generic Signal Parameter Estimation of Arbitrarily Distorted Single-Phase Grids With DC-Offset

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