An Improved Hybrid Prefiltered Open-Loop Algorithm for Three-Phase Grid Synchronization

Verma, Anant Kumar; Jarial, R. K.; Roncero‐Sánchez, Pedro; Ungarala, Mohan Rao; Guerrero, Josep M.

doi:10.1109/tie.2020.2975470

Cited by 46 publications

(17 citation statements)

References 30 publications

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“…The error in the amplitude and phase is a function of frequency deviation. With the help of an offline curve fitting tool reported by the authors recently in [8 ], the amplitude correction factor (

k_{1}

) and phase correction factor (

k_{2}

) are updated as follows:

k_{1} = 0.0004 false(normalΔ \hat{f} false)^{2} - 0.007 false(normalΔ \hat{f} false) + 0.5774

k_{2} = 0.0837 false(normalΔ \hat{f} false) + 1.0471

where the coefficients of the error factors are obtained, as shown in Fig. 4.…”

Section: Error Correction In Estimated Amplitude and Phasementioning

confidence: 99%

“…On the other hand, demodulation of grid voltage is a potential and widely accepted approach for obtaining the fundamental orthogonal components [5, 7–10 ]. However, the DC‐offset component will become full cycle component in

d q

‐frame [3 ] and odd‐harmonics will be transformed into even harmonics [7, 8 ]. This affects the window length of the low‐pass filter which leads to a poor dynamic performance.…”

Section: Introductionmentioning

confidence: 99%

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Modified non-adaptive bandpass filter based phase locked loop

Verma

Jarial

Rao

2020

Electronics Letters

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In this Letter, a demodulation based pre‐filtering technique is proposed for fast detection of the single‐phase grid variables. The estimation of grid voltage parameters is achieved through a Type‐I synchronous reference frame phase‐locked loop (PLL). The modified bandpass filter in the pre‐filtering stage ensure a better rejection of the DC‐offset and harmonics. Thus, the grid variables are estimated rapidly with the help of a simple proportional controller. Consequently, in‐loop filtering burden and the effort required to tune the PLL is minimal. However, steady errors are witnessed in the fundamental amplitude and the phase information which are mitigated by a curve fitting technique. Importantly, the proposed PLL scheme has improved the dynamic performance under off‐nominal frequency conditions with immunity against grid disturbances. The robustness of the proposed algorithm is experimentally verified vis‐à‐vis existing literature.

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k_{1}

) and phase correction factor (

k_{2}

) are updated as follows:

k_{1} = 0.0004 false(normalΔ \hat{f} false)^{2} - 0.007 false(normalΔ \hat{f} false) + 0.5774

k_{2} = 0.0837 false(normalΔ \hat{f} false) + 1.0471

where the coefficients of the error factors are obtained, as shown in Fig. 4.…”

Section: Error Correction In Estimated Amplitude and Phasementioning

confidence: 99%

d q

‐frame [3 ] and odd‐harmonics will be transformed into even harmonics [7, 8 ]. This affects the window length of the low‐pass filter which leads to a poor dynamic performance.…”

Section: Introductionmentioning

confidence: 99%

Modified non-adaptive bandpass filter based phase locked loop

Verma

Jarial

Rao

2020

Electronics Letters

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“…High bandwidth enhances the dynamic performance but at the cost of lower disturbance rejection capability. Open-loop techniques [29]- [31] present a solution to this problem by not requiring the feedback. Open-loop techniques generally use derivative to estimate the frequency.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Frequency Adaptive Demodulation Technique for Grid-Connected Converters

Ahmed

Biricik

Benbouzid

2021

IEEE Trans. Ind. Electron.

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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.

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“…The OSG based on demodulation of the grid voltage signal is a potential approach to estimate the grid attributes [15]- [24]. The demodulation of a single-phase signal is achieved by multiplying fixed frequency unit orthogonal signals that provide rotating reference (dq) frame components, as reported in [15], [16].…”

Section: Introductionmentioning

confidence: 99%

A review on pre-breakdown phenomena in ester fluids: Prepared by the international study group of IEEE DEIS liquid dielectrics technical committee

Rao

Fofana

Béroual

et al. 2020

IEEE Trans. Dielect. Electr. Insul.

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In this article, a robust Lyapunov demodulator (LD) based on orthogonal signal generation (OSG) approach for single/three-phase application is proposed. Conventionally, LD is not capable of rejecting the DC-offset in the grid signal. Thus, an additional estimation loop is required which may affect the dynamic performance. Nevertheless, an application of harmonically polluted grid voltage signal to LD may severely affect the steady-state performance of the estimated parameters. To address these issues, an enhanced LD based-OSG is proposed, wherein a moving average filter is incorporated in the LD-OSG structure. Thus, rapid rejection of DC-offset and harmonics is easily achieved without any additional loop. The proposed structure may accurately estimate the fundamental in-phase and the quadrature components. However, these orthogonal components may suffer from amplitude imbalance and errors in the phase information under off-nominal frequency conditions. Additionally, the errors in the amplitude and the phase information are eliminated using an open-loop frequency deviation detector and a feed-forward curve fitting approach. The dynamic performance of the proposed scheme has been validated by numerical and hardware studies. It is reported that, with the less sensitivity toward phase angle jump and good immunity to fundamental negative sequence, the proposed scheme is a potential technique for synchronization of single/three-phase grid connected power electronic equipment.

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An Improved Hybrid Prefiltered Open-Loop Algorithm for Three-Phase Grid Synchronization

Cited by 46 publications

References 30 publications

Modified non-adaptive bandpass filter based phase locked loop

Modified non-adaptive bandpass filter based phase locked loop

Enhanced Frequency Adaptive Demodulation Technique for Grid-Connected Converters

A review on pre-breakdown phenomena in ester fluids: Prepared by the international study group of IEEE DEIS liquid dielectrics technical committee

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