Second order generalized integrator based synchronization technique for polluted grid conditions

Misra, Banishree; Nayak, Byamakesh

doi:10.1109/i2ct.2017.8226294

Cited by 12 publications

(6 citation statements)

References 13 publications

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“…The current and active damping controllers are considered proportional controllers with gains of Kp and Kc. The grid voltage is fed forward to modulation wave m through the narrow band-pass filter Gvff(s) [21] to suppress inrush current at the starting-up moment and harmonic current caused by grid voltage harmonics. This paper ignores the dynamic characteristic of Gvff(s).…”

Section: A Modeling Of the Investigated Grid-connected Convertermentioning

confidence: 99%

High-Frequency Current Ripple Sample Anti-Aliasing Strategy of Digitally Controlled Converter Based on Notch Filter

Duan

Sheng

et al. 2023

IEEE Access

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The digital controller of the grid-connected converter achieves closed-loop control by sampling key voltage and current signals. High-frequency commutation of power electronic switches introduces high-frequency ripples into the signals, which may cause sampling aliasing. Severe distortion may happen in the output current of the converter because of the sampling aliasing. This paper explains how the aliasing problem arises by analyzing the spectrum of signals for sampling control. The explanation shows the severity of the aliasing problem and the necessity of adopting anti-aliasing methods. Next, this paper analyzes the impact of commonly used anti-aliasing low-pass filters on current control stability. From the conclusions, adopting a low-pass anti-aliasing filter reduces the stability margin of the current loop, which needs improvement. So this paper proposes a novel hybrid anti-aliasing filter based on the combination of the notch and low pass analog filters. An experiment on a 6kVA prototype verifies the proposed anti-aliasing method. This paper shows distortion and step-response oscillation of the output current when proposed and traditional anti-aliasing methods adopted. The comparison shows the advantages of the proposed anti-aliasing method.KEYWORDS grid-connected converter, high-frequency ripples, anti-aliasing strategy, stability margin.

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Section: A Modeling Of the Investigated Grid-connected Convertermentioning

confidence: 99%

High-Frequency Current Ripple Sample Anti-Aliasing Strategy of Digitally Controlled Converter Based on Notch Filter

Duan

Sheng

et al. 2023

IEEE Access

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“…Stability of the filter depends on its bandwidth and damping factor. Proper choice of bandwidth [10,11] can eliminate higher-order harmonics from the output of SOGI, keeping the system stability intact. However, the full magnitude of negative sequence current appears with positive sequence current component at the filter output which is confirmed by the following equation:…”

Section: Sogi-based Filtermentioning

confidence: 99%

Improved Grid Synchronization Technique Under Adverse Grid Condition

Misra

Tripathy

Nayak

2021

Lecture Notes in Electrical Engineering

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The identification and extraction of positive sequence fundamental component from an unbalanced and polluted grid signal have a vital role in controlling the grid integrated electrical power converters. The mostly used synchronous reference frame phase lock loop (SRF-PLL) fails in executing this task for an unbalanced and harmonically distorted grid voltage. In this paper, the SRF-PLL along with a low pass filter (fourth order Butterworth filter) is utilized to extract the positive sequence fundamental signal from a distorted grid voltage. The detailed study of the proposed low pass filter with second order generalized integrator (SOGI) and SRF-PLL is presented to exhibit its adaptability to adverse grid conditions and power quality issues. The proposed synchronization structure will provide fast and robust performance under voltage sag, harmonics, and sudden phase jump without compromising the dynamic performance and stability of the overall synchronization structure. To validate the performance of the proposed technique, a detailed dynamic analysis and harmonic analysis are carried out in MATLAB/Simulink environment.

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“…Therefore, the required reactive power is provided under the condition that the amplitude of output current is k i I g * . Owing to the hold function of VSG and the existence of virtual impedance by second-order generalised integrator [26], U ind decreases during the period of LVRT. At the moment of grid fault recover, I gd * reduces instantaneously due to the lower restore speed of U ind than V gd , which helps to suppress the impact current.…”

Section: New Additional Current Loopmentioning

confidence: 99%

Low‐voltage ride through control strategy of virtual synchronous generator based on the analysis of excitation state

Shi

et al. 2018

IET Generation, Transmission & Distribution

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Second order generalized integrator based synchronization technique for polluted grid conditions

Cited by 12 publications

References 13 publications

High-Frequency Current Ripple Sample Anti-Aliasing Strategy of Digitally Controlled Converter Based on Notch Filter

High-Frequency Current Ripple Sample Anti-Aliasing Strategy of Digitally Controlled Converter Based on Notch Filter

Improved Grid Synchronization Technique Under Adverse Grid Condition

Low‐voltage ride through control strategy of virtual synchronous generator based on the analysis of excitation state

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