Enhanced Current Reference Calculation to Avoid Harmonic Active Power Oscillations

Javier Serrano, Javier Moriano, Mario Rizo and Francisco Javier Dongil
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Javier Serrano: Department of Electronics, University of Alcalá, Ctra. Madrid-Barcelona km 33, 28805 Alcalá de Henares, Spain
Javier Moriano: Altran Spain, Campezo Street, 1, 28022 Madrid, Spain
Mario Rizo: Gamesa Electric, Mar Mediterráneo Street, 6, 28830 San Fernando de Henares, Madrid, Spain
Francisco Javier Dongil: Department of Electronics, University of Alcalá, Ctra. Madrid-Barcelona km 33, 28805 Alcalá de Henares, Spain

Energies, 2019, vol. 12, issue 21, 1-21

Abstract: Energy storage systems play a key role in the rise of distributed power generation systems, hence there is great interest in extending their lifetimes, which are directly related to DC current ripple. One of the ripple sources is the low-frequency active power fluctuations under unbalanced and distorted grid voltage conditions. Therefore, this paper addresses a multifrequency control strategy where the harmonic reference currents are calculated to reduce harmonic active power oscillations. The stationary reference frame (StRF) approach taken here improves the precision and computational time of the current reference calculation method. Additionally, in order to ensure safe converter operation when a multifrequency reference current is provided, a computational efficient peak current saturator is applied while avoiding signal distortion every time step. If the injected current harmonic distortion is to be minimized, which is a feature included in this work, the peak current saturator is a necessary requirement. Active power ripple is reduced even with frequency variations in the grid voltage using a well-known frequency-adaptive scheme. The simulation and experimental results prove the optimized performance for the control objective: power ripple reduction with minimum current harmonic distortion.

Keywords: power quality; synchronization; harmonic distortion; multifrequency control; inverters (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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