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Nicholas A. Vovos

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Journal article
Published: 25 March 2015 in Energies
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This work presents a method of current harmonic reduction in a distorted distribution system. In order to evaluate the proposed method a grid with high-order current harmonics is assumed. The reduction of current distortion is feasible due to the pulse modulation of an active filter, which consists of a buck-boost converter connected back-to-back to a polarity swapping inverter. For a practical application, this system would be the power electronic interface of a Renewable Energy Source (RES) and therefore it changes a source of harmonics to a damping harmonics system. Using the proposed method, the current Total Harmonic Distortion (THD) of the grid is reduced below the acceptable limits and thus the general power quality of the system is improved. Simulations in the MATLAB/SIMULINK platform and experiments have been performed in order to verify the effectiveness of the proposed method.

ACS Style

Ioannis Bouloumpasis; Panagis Vovos; Konstantinos Georgakas; Nicholas A. Vovos. Current Harmonics Compensation in Microgrids Exploiting the Power Electronics Interfaces of Renewable Energy Sources. Energies 2015, 8, 2295 -2311.

AMA Style

Ioannis Bouloumpasis, Panagis Vovos, Konstantinos Georgakas, Nicholas A. Vovos. Current Harmonics Compensation in Microgrids Exploiting the Power Electronics Interfaces of Renewable Energy Sources. Energies. 2015; 8 (4):2295-2311.

Chicago/Turabian Style

Ioannis Bouloumpasis; Panagis Vovos; Konstantinos Georgakas; Nicholas A. Vovos. 2015. "Current Harmonics Compensation in Microgrids Exploiting the Power Electronics Interfaces of Renewable Energy Sources." Energies 8, no. 4: 2295-2311.

Journal article
Published: 01 July 2011 in Electric Power Systems Research
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ACS Style

Christina N. Papadimitriou; Nicholas A. Vovos. Integration of a hybrid fuel cell-battery system to a distribution grid. Electric Power Systems Research 2011, 81, 1299 -1307.

AMA Style

Christina N. Papadimitriou, Nicholas A. Vovos. Integration of a hybrid fuel cell-battery system to a distribution grid. Electric Power Systems Research. 2011; 81 (7):1299-1307.

Chicago/Turabian Style

Christina N. Papadimitriou; Nicholas A. Vovos. 2011. "Integration of a hybrid fuel cell-battery system to a distribution grid." Electric Power Systems Research 81, no. 7: 1299-1307.

Journal article
Published: 01 June 2010 in Energies
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Storage devices are introduced in microgrids in order to secure their power quality, power regularity and offer ancillary services in a transient period. In the transition period of a low voltage microgrid, from the connected mode of operation to the islanded mode of operation, the power unbalance can be partly covered by the inertia energy of the existing power sources. This paper proposes fuzzy local controllers exploiting the inertia of a Wind Turbine (WT) with a Doubly Fed Induction Generator (DFIG), if such a machine exists in the microgrid, in order to decrease the necessary storage devices and the drawbacks that arise. The proposed controllers are based in fuzzy logic due to the non linear and stochastic behavior of the system. Two cases are studied and compared during the transient period where the microgrid architecture and the DFIG controller differ. In the first case, the understudy microgrid includes a hybrid fuel cell system (FCS)-battery system and a WT with a DFIGURE. The DFIG local controller in this case is also based in fuzzy logic and follows the classical optimum power absorption scenario for the WT. The transition of the microgrid from the connected mode of operation to the islanded mode is evaluated and, especially, the battery contribution is estimated. In the second case, the battery is eliminated. The fuzzy controller of the DFIG during the transition provides primary frequency control and local bus voltage support exploiting the WT inertia. The response of the system is estimated in both cases using MATLAB/Simulink software package.

ACS Style

Christina N. Papadimitriou; Nicholas A. Vovos. Transient Response Improvement of Microgrids Exploiting the Inertia of a Doubly-Fed Induction Generator (DFIG). Energies 2010, 3, 1049 -1066.

AMA Style

Christina N. Papadimitriou, Nicholas A. Vovos. Transient Response Improvement of Microgrids Exploiting the Inertia of a Doubly-Fed Induction Generator (DFIG). Energies. 2010; 3 (6):1049-1066.

Chicago/Turabian Style

Christina N. Papadimitriou; Nicholas A. Vovos. 2010. "Transient Response Improvement of Microgrids Exploiting the Inertia of a Doubly-Fed Induction Generator (DFIG)." Energies 3, no. 6: 1049-1066.