A Pseudo Open Loop Synchronization technique for heavily distorted grid voltage

Safa, Ahmed; Berkouk, El Madjid; Messlem, Youcef; Chedjara, Zakaria; Gouichiche, Abdelmadjid

doi:10.1016/j.epsr.2018.01.014

Cited by 30 publications

(34 citation statements)

References 25 publications

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“…This constitutes the complete hardware in the loop (HIL) experimental setup. In grid synchronization literature, HIL experimental study is not uncommon [35], [39].…”

Section: Numerical Simulation and Experimental Resultsmentioning

confidence: 99%

“…All techniques mentioned so far use closed-loop technique to estimate the parameters. It is to be mentioned here that there are some open or pseudo-open loop techniques [35] available in the literature as well to estimate the parameters.…”

Section: Introductionmentioning

confidence: 99%

“…Hardware in the loop experimental setup overview[35]. Number of mathematical operations involved in the implementation of proposed technique and multi-resonant double SOGI-FLL.…”

mentioning

confidence: 99%

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Frequency Adaptive Parameter Estimation of Unbalanced and Distorted Power Grid

Ahmed

Benbouzid

Ahsan³

et al. 2020

IEEE Access

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Grid synchronization plays an important role in the grid integration of renewable energy sources. To achieve grid synchronization, accurate information of the grid voltage signal parameters are needed. Motivated by this important practical application, this paper proposes a state observer-based approach for the parameter estimation of unbalanced three-phase grid voltage signal. The proposed technique can extract the frequency of the distorted grid voltage signal and is able to quantify the grid unbalances. First, a dynamical model of the grid voltage signal is developed considering the disturbances. In the model, frequency of the grid is considered as a constant and/or slowly-varying but unknown quantity. Based on the developed dynamical model, a state observer is proposed. Then using Lyapunov function-based approach, a frequency adaptation law is proposed. The chosen frequency adaptation law guarantees the global convergence of the estimation error dynamics and as a consequence, ensures the global asymptotic convergence of the estimated parameters in the fundamental frequency case. Gain tuning of the proposed state observer is very simple and can be done using Matlab commands. Some guidelines are also provided in this regard. Matlab/Simulink based numerical simulation results and dSPACE 1104 board-based experimental results are provided. Test results demonstrate the superiority and effectiveness of the proposed approach over another state-of-the art technique.

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“…This constitutes the complete hardware in the loop (HIL) experimental setup. In grid synchronization literature, HIL experimental study is not uncommon [35], [39].…”

Section: Numerical Simulation and Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Frequency Adaptive Parameter Estimation of Unbalanced and Distorted Power Grid

Ahmed

Benbouzid

Ahsan³

et al. 2020

IEEE Access

View full text Add to dashboard Cite

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“…various variants of least-square estimation [12], [13], adaptive notch filter (ANF) [14], various variants of delayed signal cancellation (DSC) techniques [15]- [19], linear observer [20]- [23], harmonic oscillators (linear and nonlinear) [24], [25], various variants of phase-locked loop (PLL) [26]- [30], demodulation-based techniques [31], [32], open-loop techniques [33], [34], etc.…”

Section: Introductionmentioning

confidence: 99%

“…However, as the fundamental block of this technique uses a linear harmonic oscillator, the presence of harmonics will give rise to steady-state error. Using filter similar to SOGI, [34] proposed a pseudo-open loop technique for three-phase system. This result can be easily adapted to single-phase system using orthogonal signal generator (OSG).…”

Section: Introductionmentioning

confidence: 99%

Coordinate Transformation-Free Observer-Based Adaptive Estimation of Distorted Single-Phase Grid Voltage Signal

et al. 2020

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This paper studies the phase and frequency estimation problem of single-phase grid voltage signal in the presence of DC offset and harmonics. For this purpose, a novel parameterized linear model of the grid voltage signal is considered where the unknown frequency of the grid is considered as the parameter. Based on the developed model, a linear observer (Luenberger type) is proposed. Then using Lyapunov stability theory, an estimator of the unknown grid frequency is developed. In order to deal with the grid harmonics, multiple parallel observers are then proposed. The proposed technique is inspired by other Luenberger observers already proposed in the literature. Those techniques use coordinate transformation that requires real-time matrix inverse calculation. The proposed technique avoids real-time matrix inversion by using a novel state-space model of the grid voltage signal. In comparison to similar other techniques available in the literature, no coordinate transformation is required. This significantly reduces the computational complexity w.r.t. similar other techniques. Comparative experimental results are provided with respect to two other recently proposed nonlinear techniques to show the dynamic performance improvement. Experimental results demonstrate the suitability of the proposed technique.

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