A New Approach for EPLL-Based Frequency Estimation under Severe Disturbances

Martins, Carlos H. N.; Moreira, Mariana Geny; Vale-Cardoso, Adriano S.

doi:10.1109/iemcon.2019.8936282

Cited by 4 publications

(5 citation statements)

References 19 publications

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“…The performance of available enhanced PLLs (EPLLs) [38][39][40][41][42] and second-order generalized integrator-based PLLs (SOGI-PLLs) [43][44][45][46] are affected by different disturbances, such as subharmonics and inter-harmonics. The work in [47] introduces solving this issue by modifying the structure using the adaptive filter.…”

Section: Introductionmentioning

confidence: 99%

Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

Bany Fawaz,

Smadi,

Albatran

et al. 2024

Energies

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In recent years, several research works have addressed and developed the phase-locked loop (PLL) in single-phase grid-connected converters with different structures and properties. Each has merits and demerits, such as a complex structure, high computational burden, and slow transient response. This paper aims to comprehensively review advanced single-phase PLLs based on transport delay operators to realize signal orthogonality. A deep insight into the PLLs’ small-signal modeling, main characteristics, stability analysis, and loop filter design are provided in this paper. The main advantages and drawbacks are explained for each type of PLL in terms of different performance indexes, such as settling time, estimation error, and ripples in the estimated grid information. This paper also aims to provide optimal tuning and design of the loop filter gains from the large-signal model point of view, including all the nonlinearities, adopting the stochastic optimization method. All simulations are implemented using the MATLAB/Simulink 2018b environment to validate all theoretical analyses of this paper. The sampling and nominal frequencies are set to be 100 kHz and 50 Hz throughout all the simulation studies.

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Section: Introductionmentioning

confidence: 99%

Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

Bany Fawaz,

Smadi,

Albatran

et al. 2024

Energies

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“…Conversely, the developed control algorithm is based on the Enhanced Phase-Locked Loop (EPLL), which consists of a PLL combined with an outer loop used to estimate the signal’s amplitude. Furthermore, the Enhanced Phase Locked Loop (EPLL) performs better than the PLL as the outer loop helps convergence by reducing the transient time and canceling the double-frequency ripples typical of the PLL (İnci et al (2017); Karimi-Ghartemani (2014b,a); Lopes et al (2014); Martins et al (2019)). Like the PLL, the EPLL has been developed for the estimation and control of signals in electric grids and electronic devices (Karimi-Ghartemani (2014a); Karimi-Ghartemani and Iravani (2002); Karimi-Ghartemani and Ziarani (2003)), and the application of the EPLL to the active control of vibrations is entirely novel.…”

Section: Introductionmentioning

confidence: 99%

A vibration suppression approach based on enhanced phase locked loop harmonic tracking

Bianchi

Zilletti²,

Cinquemani

et al. 2023

Journal of Vibration and Control

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This article presents a novel algorithm for vibration suppression with inertial actuators. This algorithm is designed to cancel out harmonic disturbances and finds application in rotating machines like helicopters and, more in general, in structures connected to rotors, which generate a single-harmonic disturbance with a frequency far from any natural frequency of the structure. The existing control algorithms for inertial actuators are mainly designed to cancel out vibrations arising from slightly damped structural modes, so they are not suitable for this specific application, whereas the proposed control algorithm is based on the Enhanced Phase Locked Loop (EPLL), a non-linear adaptive bandpass filter originally designed to stabilize electrical systems. In this work, the use of the EPLL is extended to the vibration control of a mechanical system as it is used to track frequency and amplitude variations of the vibration acceleration and calculate the required control force to suppress it. In this article, the algorithm is described, and the parameters of the EPLL are tuned, analyzing their influence on the actuators’ performances. Numerical simulations are performed to discuss its stability, analyze its performance, and compare this novel algorithm to other existing control strategies. Finally, the proposed control algorithm is applied to a helicopter tailplane using two identical inertial actuators. The experiments have shown that the EPLL-based control can effectively cancel out single-harmonic vibrations far from the resonance and that it is robust to amplitude and frequency variations.

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“…Among all the reported methods, PLL based methods are widely used due to their inherent simplicity and robustness. There are several methods in literature, such as the synchronous reference frame PLL (SRF-PLL) [30,31], the inverse-park PLL (IP-PLL) [32], the transport-delay PLL (TD-PLL) [33,34], the quadrature PLL (QPLL) [35,36], the enhanced PLL (EPLL) [37][38][39][40][41][42][43][44][45][46], or the SOGI-PLL. This last one, based on the SOGI filter that generates quadrature components of the input signal to be linked with the PLL [47][48][49][50][51][52][53][54][55].…”

Section: Grid Synchronization Techniquesmentioning

confidence: 99%

“…The enhanced phase-locked loop (EPLL) [38][39][40][41][42][43][44][45] The EPLL phase detection is achieved using an Adaptive Filter (AF) and a sinusoidal multiplier, as it is shown in Fig. 24.…”

Section: Epllmentioning

confidence: 99%

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Enhance OF SOGI-FLL and SOGI-PLL response to voltage sags and swells perturbations

Nejad¹

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The scope of this thesis is related to the enhancement of the operation of distributed generators (DGs) based on renewable energies (REs) when connected to the conventional grid network. Synchronization of those DGs, i.e. their front-end inverters, with the grid is critical for injecting power into the grid. Internal control loops of voltage source inverters (VSIs) monitor parameters such as the utility voltage's phase, amplitude, and frequency to achieve proper synchronization and inject power into the grid. Therefore, an appropriate estimation of the grid parameters is needed for completing the mentioned goals. The different existing monitoring techniques still face technical challenges when appearing faults on the grid, particularly voltage sags and voltage swells. From those techniques, SOGI-FLL and SOGI-PLL are widely spread in power inverters. In the mentioned faulty conditions, a degradation of the estimated parameters occurs due to the impact of the grid defaults on the dynamic performance of the SOGI-FLL and SOGI-PLL estimators. In the literature, it was not found contributions to those problems. This research aimed to contribute by providing a fast and accurate detection of the faults, yielding a robust dynamical response of the VSIs control structure in front of such perturbations, thanks to a fast and precise estimation of grid parameters. This faults detection strategy was accompanied by minimization of the monitored parameters drift due to inherent harmonic pollution of the faults. Then a first contribution has been the design and implementation of a Finite State Machine on a synchronization structure known as SOGI-PLL and in SOGI-FLL, enhancing their dynamical response regarding transient time and steady-state response in front of voltage sags. A second contribution has been implementing the strategy to face the problems derived from voltage swells with satisfactory results. The research was carried out in the E3PACS laboratory facilities of EEBE-UPC. This work is organized as follows: In Section 1, the study is contextualized. Section 2 describes Power Quality indexes benchmarking for assessing the problem to solve and the obtained results. It is then followed by Section 3, where the SOGI-FLL response against voltage sags and swells is analyzed. Therefore, Section 4 summarizes the different approaches and results for mitigating the grid faults studied. Section 5 is devoted to showing SOGI-PLL amelioration by applying SOGI Error-Based algorithm. Finally, Section 6 summarizes the main contributions of this work, along with the general conclusions. Section 7 lists future work, in Section 8 are listed the published JCR indexed papers. L'abast d'aquesta tesi està relacionat amb la millora del funcionament dels generadors distribuïts (DG, distributed generation en anglès) basats en energies renovables quan es connecten a la xarxa elèctrica convencional. La sincronització d'aquests DG amb la xarxa és fonamental per injectar energia a aquesta, especialment quan es tracta d'inversors de potència. Els llaços de control interns dels inversors de font de tensió (VSI, Voltage Source Inverters en anglès) controlen paràmetres com ara la fase, l'amplitud i la freqüència de la tensió de la xarxa per aconseguir una sincronitzaciórequerida. Per tant, es necessita una estimació adequada dels paràmetres del bus de tensió per assolir els objectius esmentats. Les diferents tècniques de monitorització existents encara s'enfronten a reptes tècnics a l'hora d'aparèixer fallades a la xarxa, especialment caigudes i augments abruptes de tensió ("Voltage sags" i "Voltage swells" en anglès, respectivament). En el cas dels inversors, les tècniques basades en estructures SOGI-FLL i SOGI-PLL estan àmpliament esteses i, en les esmentades condicions de fallada, es produeix una degradació dels paràmetres estimats a causa de l'impacte dels defectes de la xarxa en el seu comportament dinàmic . A la literatura, no es van trobar contribucions rellevants per mitigar aquests problemes. Aquesta investigació pretén doncs contribuir proporcionant una detecció ràpida i precisa de les fallades, donant una resposta dinàmica robusta de l'estructura de control dels VSI davant d'aquestes pertorbacions, gràcies a una estimació ràpida i precisa dels paràmetres de la xarxa. Aquesta estratègia de detecció de fallades s'acompanya de la minimització de la deriva dels paràmetres monitoritzats a causa de la contaminació harmònica inherent de les fallades. Així doncs, una primera contribució ha estat el disseny i la implementació d'una màquina d'estats finits en una estructura de sincronització coneguda com SOGI-PLL i en SOGI-FLL, millorant la seva resposta dinàmica pel que fa al temps transitori i la resposta en estat estacionari davant les caigudes de tensió. Una segona aportació ha estat la implementació de l'estratègia per afrontar amb resultats satisfactoris els problemes derivats de les pujades de tensió (voltage swells). La investigació es va dur a terme a les instal·lacions del laboratori E3PACS de l'EEBE-UPC. Aquest treball s'organitza de la següent manera: A l'apartat 1 es contextualitza l'estudi. La secció 2 descriu el la referenciació dels índexs de qualitat de l'energia per avaluar el problema a resoldre i els resultats obtinguts. A continuació, segueix la Secció 3, on s'analitza la resposta SOGI-FLL contra les caigudes i les inflors de tensió. Per tant, la Secció 4 resumeix els diferents enfocaments i resultats per mitigar les falles de la xarxa estudiades. La secció 5 està dedicada a mostrar la millora SOGI-PLL aplicant l'algorisme SOGI basat en errors. Finalment, l'apartat 6 resumeix les principals aportacions d'aquest treball, juntament amb les conclusions generals. La secció 7 enumera els treballs futurs, a la secció 8 s'enumeren els articles indexats JCR publicats.

show abstract

A New Approach for EPLL-Based Frequency Estimation under Severe Disturbances

Cited by 4 publications

References 19 publications

Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

A vibration suppression approach based on enhanced phase locked loop harmonic tracking

Enhance OF SOGI-FLL and SOGI-PLL response to voltage sags and swells perturbations

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