A Self-tuning Grid Synchronization Method for Active Power Filters

Ngo, Tuan; Biricik, Samet; Basu, Malabika

doi:10.1080/15325008.2016.1200696

Cited by 18 publications

(13 citation statements)

References 12 publications

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“…The use of active filters has been suggested and a method extracting each harmonic and interharmonic current reference with 5 Hz resolution has been proposed in [6,7] by using multiple synchronous reference frame (MSRF) technique. Active power filters (APF) have been a hot research topic for nearly three decades due to their superiorities to passive harmonic filters [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. There are various APF types, summarized in [10], and they are classified with respect to their circuit topology and application area.…”

Section: Problem Definitionmentioning

confidence: 99%

Suppression of the Second Harmonic Subgroup Injected by an AC EAF: Design Considerations and Performance Estimation of a Shunt APF

et al. 2018

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This paper proposes a design methodology for an active power filter (APF) system to suppress the second harmonic subgroup injected by an AC electric arc furnace (EAF) to the utility grid. The APF system is composed of identical parallel units connected to the utility grid via a specially-designed coupling transformer. Each APF converter is a three-phase three-wire two-level voltage source converter (VSC). The number of parallel APF units, coupling transformer MVA rating, and turns ratio are optimized in the view of the ratings of commercially-available high voltage (HV) IGBTs. In this research work, line current waveforms sampled at 25.6-kS/s on the medium voltage (MV) side of a 65-MVA EAF transformer are then used to extract the second harmonic subgroup, 95-, 100-, and 105-Hz current components, by multiple synchronous reference frame (MSRF) analysis, which was previously proposed to decompose EAF current interharmonics and harmonics in real-time. By summing up this digital data of the second harmonic subgroup, the reference current signal for the APF system is produced in real-time. A detailed model of the APF system is then run on EMTDC/PSCAD to follow the produced reference current signal according to hysteresis band control philosophy. The simulation results show that the proposed APF system can successfully suppress the second harmonic subgroup of an AC EAF.

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Section: Problem Definitionmentioning

confidence: 99%

Suppression of the Second Harmonic Subgroup Injected by an AC EAF: Design Considerations and Performance Estimation of a Shunt APF

et al. 2018

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“…Band-pass filter-type synchronization algorithms [17], [18] became very popular in recent times. Out of them, second order generalized integrator (SOGI) [18], [19] and adaptive notch filter (ANF) [17] are very similar in nature and uses frequency adaptive filter gain while self-tuning filter (STF) [20], [21] do not use any frequency adaptive gain. SOGI and ANF can be applied to both single and three-phase while STF is limited to three-phase.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Frequency Adaptive Demodulation Technique for Grid-Connected Converters

Ahmed

Biricik

Benbouzid

2021

IEEE Trans. Ind. Electron.

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This paper presents an enhanced frequency adaptive demodulation technique for grid-synchronization of grid-connected converters (GCC) in variable frequency condition. Demodulation works by generating demodulated voltages which contain undesired double frequency components. As a result, high-order low-pass filters (LPF) with high cutoff frequency are required to eliminate the undesired components. This reduces the dynamic performance. Frequency adaptive demodulation technique enhances the dynamic performance by rejecting the double frequency components as opposed to filtering, however, at the cost of additional computational complexity. This paper overcomes this problem by using double demodulation without recreating the double frequency component for rejection purpose. This reduces the computational complexity significantly. Suitability of proposed method is verified through numerical simulation and experimental study. Comparative study with existing frequency adaptive demodulation and second-order generalized integrator phase-locked loop (SOGI-PLL) techniques demonstrate the validity and performance improvement by the proposed technique.

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“…In the CCF, resonant frequency is fixed to extract the fundamental component. In the Ngo et al, 15 for source current reference generation, SRF theory is utilized along with DFCE, and due to that, computation requirement is high. Moreover, in Bhat et al, 16 DFCE is utilized along with the instantaneous power method.…”

Section: Introductionmentioning

confidence: 99%

Performance improvement of shunt active power filter under variable grid frequency condition using complex coefficient filter‐frequency locked loop

Dubey

Mishra

Kumar

2021

Circuit Theory & Apps

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Summary Synchronizing methodology for shunt active power filter (SAPF) based on the resonant controller using generalized integrator (GI) in the stationary reference frame is of great interest for researchers now a day. In this paper, a phase synchronizing technique based on the complex coefficient filter (CCF) embedded with a frequency locked loop (FLL) is proposed for the fundamental active and reactive component extraction of load current and unit template generation from grid supply. The proposed CCF‐FLL–based control works effectively under varying grid frequency, distorted and unbalance grid voltage conditions to generate the reference source current at a unity power factor for proper harmonic compensation using an indirect current control method. In this work, a detailed mathematical modeling for development of control logic for CCF‐FLL is done, and its feasibility with the bode plot is also confirmed. Simulation for SAPF is performed using both CCF and CCF‐FLL–based control strategy separately to judge the performance of each. Simulation confirms that the proposed CCF‐FLL based control is capable of maintaining the source current with low total harmonic distortion (THD) as per the IEEE‐519 standard with the nonlinear load. The effectiveness of the proposed controller for desired harmonics compensation is also validated through real‐time simulation using OPAL‐RT OP4510 platform.

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A Self-tuning Grid Synchronization Method for Active Power Filters

Cited by 18 publications

References 12 publications

Suppression of the Second Harmonic Subgroup Injected by an AC EAF: Design Considerations and Performance Estimation of a Shunt APF

Suppression of the Second Harmonic Subgroup Injected by an AC EAF: Design Considerations and Performance Estimation of a Shunt APF

Enhanced Frequency Adaptive Demodulation Technique for Grid-Connected Converters

Performance improvement of shunt active power filter under variable grid frequency condition using complex coefficient filter‐frequency locked loop

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