Grid-Connection strategy with reduced current spikes for grid-tie module-integrated converter

Machado, Sebastian de J. Manrique; Campanhol, Leonardo Bruno Garcia; Silva, Newton da; Millán, Idi Amin Isaac

doi:10.1109/isgt-la.2017.8126688

Cited by 2 publications

(2 citation statements)

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“…The converter-side current (i i ) signal, that is accessed in the estimator as depicted in Figure 4, is used in this work to attain the virtual resistor AD [10], and the capacitor voltage signal, that is also a result from the estimators processing, can be applied to obtain softer grid connection [14].…”

Section: A Damped Model-based Estimator Structurementioning

confidence: 99%

“…Furthermore, it will be presented in section V, that the the estimated current shows fewer high frequency components, resulting in a cleaner signal. Also, the generic estimator described is capable of reconstruct multiple variables of the LCL filter, therefore, it can be applied for different situations besides AD, such as using an estimated capacitor voltage for reducing current spikes in the moment of grid connection [14].…”

Section: Introductionmentioning

confidence: 99%

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A Generic Robust Model-Based Estimator for Active Damping of Single-Phase GridTied Inverters

Romão¹,

Silva²

2022

Eletrônica de Potência

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This paper presents the design and analysis of a signal estimator with improved robustness applied in the active damping (AD) of a single-phase gridtied inverter with LCL low-pass filter. The proposed estimator is based on the mathematical model of the LCL filter, with resistors in series with the converterside inductor and capacitor for improving robustness. The implementation method is also capable of estimate multiple filter signals. The control strategy presented uses a virtual resistor based AD, that suppresses the resonance ensuring stability and robustness, helping comply with power quality standards, such as IEEE 1547 and IEC 61727. The signal necessary for achieving the AD is obtained through the estimator, dismissing the use of additional sensors. The current control structure uses grid-side current feedback with proportional-resonant controller and harmonic compensation.The system is designed by the root locus approach to achieve stability despite grid parameter variance. The estimator and overall system is analyzed through mathematical modeling, computational simulation and experimental setup. The results show that the estimator presented is capable of providing the necessary AD feedback signal, even with grid inductance variation.

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Section: A Damped Model-based Estimator Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%