Robust Gradient Estimator for Unknown Frequency Estimation in Noisy Environment: Application to Grid-Synchronization

2022 4th Global Power, Energy and Communication Conference (GPECOM)

2022

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Section: A Efr Controllermentioning

confidence: 99%

Extending the Energy Storage Lifetime: A Hybrid Power-Sharing Method

Salli¹,

2022 4th Global Power, Energy and Communication Conference (GPECOM)

2022

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“…This can be estimated from the estimated phase-angleφ. For this purpose, we consider the idea used in [14], [38]. In this approach, time derivative of the phase angle can be considered as an approximation of the frequency deviation dynamics.…”

Section: Enhanced Frequency Adaptive Demodulationmentioning

confidence: 99%

“…However, variable sampling frequency is not suitable for control applications (issue with filter design) and variable window length can be computationally expensive. Regression-based techniques [12]- [14] are another popular technique available in the literature. This type of technique use a parameterized model of the grid voltage signal.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Frequency Adaptive Demodulation Technique for Grid-Connected Converters

IEEE Trans. Ind. Electron.

Biricik

Benbouzid

2021

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This paper presents an enhanced frequency adaptive demodulation technique for grid-synchronization of grid-connected converters (GCC) in variable frequency condition. Demodulation works by generating demodulated voltages which contain undesired double frequency components. As a result, high-order low-pass filters (LPF) with high cutoff frequency are required to eliminate the undesired components. This reduces the dynamic performance. Frequency adaptive demodulation technique enhances the dynamic performance by rejecting the double frequency components as opposed to filtering, however, at the cost of additional computational complexity. This paper overcomes this problem by using double demodulation without recreating the double frequency component for rejection purpose. This reduces the computational complexity significantly. Suitability of proposed method is verified through numerical simulation and experimental study. Comparative study with existing frequency adaptive demodulation and second-order generalized integrator phase-locked loop (SOGI-PLL) techniques demonstrate the validity and performance improvement by the proposed technique.

“…Renewable energy sources (RES) such as solar photovoltaics (PV) will play a vital role in achieving net-zero carbon emissions by 2050. RES are connected to the existing alternating current (AC) grid through a voltage source inverter (VSI) [43,44,45]. An efficient operation of the RES-interfaced VSI can only be guaranteed when the output of the VSI matches in-phase with the grid voltage signal.…”

Section: Grid-synchronization Of Renewable Energy Sourcesmentioning

confidence: 99%

On robust synchronization of nonlinear systems with application to grid integration of renewable energy sources

Annual Reviews in Control

Ushirobira

Efimov

2021

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Many systems in the natural and physical world often work in unison with similar other systems. This process of simultaneous operation is known as synchronization. In the past few decades, owing to this phenomenon's importance, extensive research efforts have been made. However, many of the existing results consider the systems are identical and/or linear time-invariant, while practical systems are often nonlinear and nonidentical for various reasons. This observation motivated several recent studies on the synchronization of nonidentical (i.e., heterogeneous) nonlinear systems. This paper summarizes some recent results on the synchronization of heterogeneous nonlinear systems, as developed in the thesis [1]. First, the results on the synchronization of a particular class of robustly stable nonlinear systems are presented. Then, these results are applied to an example model known as Brockett oscillator. Finally, using the Brockett oscillator as a common dynamics, output oscillatory synchronization results are given for heterogeneous nonlinear systems of relative degree 2 or higher. An application example of Brockett oscillator for power-grid synchronization is also presented. Some outlooks are provided regarding future research directions.