2019
DOI: 10.1049/iet-rpg.2018.5261
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Adaptive EPLL for improving power quality in three‐phase three‐wire grid‐connected photovoltaic system

Abstract: A phase-locked loop (PLL) plays an integral part in synchronisation circuits and is immensely used in grid-connected systems, active filters, and uninterrupted power supplies. A number of these circuits based on synchronous reference frame and its modifications, second-order generalised integrator, enhanced PLL (EPLL) have recently been reported in literature. This article proposes an adaptive version of EPLL whose gain adjusts automatically with the variation of error. Adaptive EPLL (A-EPLL) is developed for … Show more

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Cited by 24 publications
(20 citation statements)
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References 23 publications
(36 reference statements)
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“…The proposed SOHObased FLL is enhanced with an adaptive law (13) to reconstructω 0 , which is referred to as the fundamental frequency estimator (FFE). Notice that the estimation of theω 0 in (13) involves the use of the product between the orthogonal signals as a mechanism to detect the phase in the FFE. The estimateω 0 is then used in the SOHO-QSG.…”
Section: Single-phase Soho-based Fllmentioning
confidence: 99%
See 1 more Smart Citation
“…The proposed SOHObased FLL is enhanced with an adaptive law (13) to reconstructω 0 , which is referred to as the fundamental frequency estimator (FFE). Notice that the estimation of theω 0 in (13) involves the use of the product between the orthogonal signals as a mechanism to detect the phase in the FFE. The estimateω 0 is then used in the SOHO-QSG.…”
Section: Single-phase Soho-based Fllmentioning
confidence: 99%
“…Moreover, despite the synchronization in three-phase systems, possibly motivated by traditional power systems (see some applications in REG systems [12,13]), singlephase PLLs are becoming of central interest for investigation and development due to the current massive deployment of grid-tie inverters at residential levels, due to domestic photovoltaic (PV) installations [14]. Additionally, PLL has been extensively used for the control purposes and for stability improvement [15,16].…”
Section: Introductionmentioning
confidence: 99%
“…Although these PLL control strategies are feasible to some extent, there are still large errors in PLL due to the disadvantages of poor dynamic performance and a small amount of harmonics in the positive sequence voltage component. In [25], a control strategy of SOGI-PLL based on self-regulation technology is proposed. Although this technology can filter out a large number of harmonics in the system, there are still some higher harmonics, which will reduce the accuracy of the PLL.…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, various control algorithms are available in the literature, like enhanced phase locked loop (EPLL), improved least mean square (ILMS), and besides second‐order generalised integrator (SOGI) for extracting the required reference currents. Chittora et al [25] have used the conventional EPLL controls, which have a disadvantage, that their operation is reliant on the coefficient of loop gains and non‐existence of adaptive performance at variable frequency. Bhotto and Antoniou [26] have reported adaptive algorithms such as ILMS, which is widely used in the microgrid due to their easy implementation, but they have poor convergence rate and do not have the capability to remove DC offset.…”
Section: Introductionmentioning
confidence: 99%