Three-Phase PLL for Grid-Connected Power Converters Under Both Amplitude and Phase Unbalanced Conditions

Reza, Md. Shamim; Sadeque, Fahmid; Hossain, Maruf; Ghias, Amer M. Y. M.; Agelidis, Vassilios G.

doi:10.1109/tie.2019.2893857

Cited by 60 publications

(29 citation statements)

References 29 publications

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“…To implement the proposed adaptive observer-based phase and frequency estimation technique, Eq. (4), (5) and (15) are required. Block diagram of the proposed observer is given in Fig.…”

Section: A Remarks On the Tuning Of Observer Gain Lmentioning

confidence: 99%

“…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%

“…Delayed signal cancellation (DSC) is another technique that become popular in recent time. DSC-based open and closed-loop grid synchronization techniques are reported in [15]- [19]. DSC-based techniques generally show excellent performances, however, they have high memory requirement to implement the delayed signal.…”

Section: Introductionmentioning

confidence: 99%

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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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“…To implement the proposed adaptive observer-based phase and frequency estimation technique, Eq. (4), (5) and (15) are required. Block diagram of the proposed observer is given in Fig.…”

Section: A Remarks On the Tuning Of Observer Gain Lmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…So the higher requirements are required for the acquisition of grid voltage synchronization signals [7]- [9]. Therefore, it has theoretical and practical significance to study the phaselocked loop technology under unbalanced and distorted grid conditions [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Design of a High Performance Phase-Locked Loop With DC Offset Rejection Capability Under Adverse Grid Condition

2020

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In the new energy grid-connected power generation system, accurately extracting the grid synchronization signals such as the frequency, phase and amplitude of the grid voltage is the basis for effective control. Aiming at the requirements for detecting grid synchronization signals under unbalanced, harmonics and DC offset voltage mixed conditions, a dual second-order complex coefficient filter with DC offset rejection capability (DSOCCF dc) is proposed, combining the approach of moving average filter (MAF), a novel hybrid filter in dq-frame is designed and on the basis of this design a new synchronous reference frame phase locked loop (SRF-PLL) design approach based on the hybrid filter is proposed. The proposed approach employs moving average filter (MAF) to block the high-frequency harmonics in the grid voltage, and uses DSOCCF dc to separate the fundamental frequency positive and negative sequence and reject DC offset. It can accurately extract the synchronization information of the grid fundamental frequency positive sequence. After simulation and experiment verification, it can be confirmed that the proposed PLL can quickly and accurately lock the properties of the grid voltage under adverse grid condition, and also have high detection accuracy and strong robustness to frequency fluctuations. INDEX TERMS Dual second-order complex coefficient filter (DSOCCF), harmonic, phase-locked loop (PLL), dc offset, moving average filter (MAF).

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“…It has extremely strict requirements on the dynamic performance and the phase quality. Therefore, it is necessary to track the voltage phase of power grid quickly and accurately, and eliminate the harmonic content in the phase information to meet various adverse grid voltage conditions [6], [7]. The synchronous reference frame phase-locked loop (SRF-PLL) has the advantages of simple structure and easy implementation, and has been widely used in power electronics and power systems.…”

Section: Introductionmentioning

confidence: 99%

A Novel Grid Synchronization Method Based on Hybrid Filter Under Distorted Voltage Conditions

et al. 2020

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The phase-locked accuracy of conventional phase-locked method is reduced when the grid voltage contains fundamental frequency negative sequence(FFNS) component, harmonic component, and DC offset component. Aiming at this problem, a novel adaptive notch filter (NANF) is proposed, and a dual NANF (DNANF) structure is designed to eliminate the FFNS component and extract the fundamental frequency positive sequence(FFPS) component based on NANF. Furthermore, dcDNANF with DC offset rejection capability is proposed by adopting DNANF. Then a novel hybrid filter in dq-frame is designed by combining dcDNANF and the cascaded delay signal cancellation operator filter whose delay parameters are 4 and 24 in dq-frame (dqCDSC 4,24). Meanwhile, a new SRF-PLL design method is proposed based on the novel hybrid filter. This proposed method employs dqCDSC 4,24 to separate the positive and negative sequences of the voltage and eliminate the high frequency harmonics in the grid voltage, and uses dcDNANF to reject the DC offset, so as to achieve the accurate acquisition of the fundamental voltage information under distortion and unbalanced grid. Simulation and experimental results show that compared with the conventional SRF-PLL methods, the proposed method can obtain faster phase tracking speed, better phase-locked effect, faster dynamic response, and better stability. INDEX TERMS Novel adaptive notch filter (NANF), harmonic, phase-locked loop (PLL), dc offset, cascaded delay signal cancellation (CDSC).

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Three-Phase PLL for Grid-Connected Power Converters Under Both Amplitude and Phase Unbalanced Conditions

Cited by 60 publications

References 29 publications

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

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

Design of a High Performance Phase-Locked Loop With DC Offset Rejection Capability Under Adverse Grid Condition

A Novel Grid Synchronization Method Based on Hybrid Filter Under Distorted Voltage Conditions

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