Generalized Integrator-Extended State Observer With Applications to Grid-Connected Converters in the Presence of Disturbances

Guo, Baoling; Bacha, Seddik; Alamir, Mazen; Hably, Ahmad; Boudinet, Cédric

doi:10.1109/tcst.2020.2981571

Cited by 87 publications

(28 citation statements)

References 35 publications

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“…In the figure, v a , v b , v c are the three-phase grid voltages, v de , v qe are the voltages in a rotating dq reference frame, V m is the magnitude of grid voltage, g is the grid nominal angular frequency, ̂ is the estimated grid angular frequency, Δ̂ is the estimated angular frequency deviation, is the actual phase angle of grid voltage, and ̂ is the estimated phase angle of grid voltage. Moreover, the general design rules for an SRF-PLL have been highlighted in [10], which are also followed in this work.…”

Section: Eso-based Srf-pll Designmentioning

confidence: 99%

“…The stability index is a crucial factor for evaluating the quality of a controller [10,20,33]. An ESO-based PLL is described in [8]; however, no detailed stabilities analyses are provided.…”

Section: Frequency Domain Analysismentioning

confidence: 99%

“…14, with o ∈ {3 n , 5 n , 7 n } rad/s. The ESO can estimate the unknown disturbance very well only when the disturbances are composed of low-frequency components [10]. The disturbance estimation errors can be reduced by increasing the o ; however, the o is limited by the noises sensitivity.…”

Section: Noises Rejection Analysismentioning

confidence: 99%

“…The PLLs commonly use a PI controller as the LF [4][5][6][7]. However, the PLL control systems involve various disturbances such as phase jumps, frequency deviations, voltage magnitude variations, and nonlinear dynamics [6][7][8][9][10]. The PLL systems may loose its synchronization after a sudden large disturbance [11,12].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A phase-locked loop using ESO-based loop filter for grid-connected converter: performance analysis

Guo

Bacha

Alamir

et al. 2021

Control Theory Technol.

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An extended state observer (ESO)-based loop filter is designed for the phase-locked loop (PLL) involved in a disturbed grid-connected converter (GcC). This ESO-based design enhances the performances and robustness of the PLL, and, therefore, improves control performances of the disturbed GcCs. Besides, the ESO-based LF can be applied to PLLs with extra filters for abnormal grid conditions. The unbalanced grid is particularly taken into account for the performance analysis. A tuning approach based on the well-designed PI controller is discussed, which results in a fair comparison with conventional PI-type PLLs. The frequency domain properties are quantitatively analysed with respect to the control stability and the noises rejection. The frequency domain analysis and simulation results suggest that the performances of the generated ESO-based controllers are comparable to those of the PI control at low frequency, while have better ability to attenuate high-frequency measurement noises. The phase margin decreases slightly, but remains acceptable. Finally, experimental tests are conducted with a hybrid power hardware-in-the-loop benchmark, in which balanced/unbalanced cases are both explored. The obtained results prove the effectiveness of ESO-based PLLs when applied to the disturbed GcC.

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Section: Eso-based Srf-pll Designmentioning

confidence: 99%

Section: Frequency Domain Analysismentioning

confidence: 99%

Section: Noises Rejection Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A phase-locked loop using ESO-based loop filter for grid-connected converter: performance analysis

Guo

Bacha

Alamir

et al. 2021

Control Theory Technol.

Self Cite

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show abstract

“…-Grid-side converter control: A dual-loop control structure is commonly designed for grid-side controls [5,34]. A Phase-Locked Loop (PLL) is employed to obtain the phase of grid voltage [44]. The outer voltage loop maintains a constant DC-link voltage, where the PI controller is employed.…”

Section: Control Laws Under Testmentioning

confidence: 99%

Reduced-Scale Models of Variable Speed Hydro-Electric Plants for Power Hardware-in-the-Loop Real-Time Simulations

et al. 2020

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Variable Speed Hydro-Electric Plant (VS-HEP) equipped with power electronics has been increasingly introduced into the hydraulic context. This paper is targeting a VS-HEP Power Hardware-In-the-Loop (PHIL) real-time simulation system, which is dedicated to different hydraulic operation schemes tests and control laws validation. Then, a proper hydraulic model will be the key factor for building an efficient PHIL real-time simulation system. This work introduces a practical and generalised modelling hydraulic modelling approach, which is based on `Hill Charts’ measurements provided by industrial manufacturers. The hydraulic static model is analytically obtained by using mathematical optimization routines. In addition, the nonlinear dynamic model of the guide vane actuator is introduced in order to evaluate the effects of the induced dynamics on the electric control performances. Moreover, the reduced-scale models adapted to different laboratory conditions can be established by applying scaling laws. The suggested modelling approach enables the features of decent accuracy, light computational complexity, high flexibility and wide applications for their implementations on PHIL real-time simulations. Finally, a grid-connected energy conversion chain of bulb hydraulic turbine associated with a permanent magnet synchronous generator is chosen as an example for PHIL design and performance assessment.

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An almost globally stable adaptive phase‐locked loop for synchronization of a voltage source converter to a weak grid

Zonetti,

Bobtsov,

Ortega

et al. 2023

Adv Control Appl

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In this article, we are interested in the problem of adaptive synchronization of a voltage source converter with a possibly weak grid with unknown angle and frequency. To guarantee a suitable synchronization with the angle of the three‐phase grid voltage we design an adaptive observer for such a signal requiring measurements only at the point of common coupling. Then we propose an alternative certainty‐equivalent, adaptive phase‐locked loop that ensures the angle estimation error goes to zero for almost all initial conditions. Although well‐known, for the sake of completeness, we also present a PI controller with feedforward action that ensures the converter currents converge to an arbitrary desired value. Relevance of the theoretical results and their robustness to variation of the grid parameters are thoroughly discussed and validated in the challenging scenario of a converter connected to a grid with low short‐circuit‐ratio.

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Generalized Integrator-Extended State Observer With Applications to Grid-Connected Converters in the Presence of Disturbances

Cited by 87 publications

References 35 publications

A phase-locked loop using ESO-based loop filter for grid-connected converter: performance analysis

A phase-locked loop using ESO-based loop filter for grid-connected converter: performance analysis

Reduced-Scale Models of Variable Speed Hydro-Electric Plants for Power Hardware-in-the-Loop Real-Time Simulations

An almost globally stable adaptive phase‐locked loop for synchronization of a voltage source converter to a weak grid

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