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Ioannis D. Bouloumpasis
Department of Electrical Engineering, Chalmers University of Technology, 41296 Gothenburg, Sweden

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Journal article
Published: 03 March 2020 in Energies
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This work presents a concise methodology for the calculation of assessment indexes regarding the coupling between active and reactive power control observed on distribution level converters. First, the reader is introduced to the concept of power coupling; when, where and how it appears in power control of converters. A brief summary of the theory and formulation behind it is also included, together with relevant literature. Then, the methodology for the assessment of active and reactive power control performance of any grid-connected converter is presented. The impact of small control disturbances during a testing procedure is monitored, analyzed and converted to meaningful indexes, so that the type and level of coupling is quantified without putting the converter or the grid at risk. The efficiency of the methodology to assess the type and level of coupling is verified experimentally. This is done by assessing several power control approaches with different level of decoupling efficiency on the same power converter connected to a distribution grid. While the assessment is performed with safe, minimal disturbances, its exceptional accuracy is later confirmed by the level and type of coupling observed during significant power step changes.

ACS Style

Panagis N. Vovos; Ioannis D. Bouloumpasis; Konstantinos G. Georgakas. Assessment Indexes for Converter P-Q Control Coupling. Energies 2020, 13, 1144 .

AMA Style

Panagis N. Vovos, Ioannis D. Bouloumpasis, Konstantinos G. Georgakas. Assessment Indexes for Converter P-Q Control Coupling. Energies. 2020; 13 (5):1144.

Chicago/Turabian Style

Panagis N. Vovos; Ioannis D. Bouloumpasis; Konstantinos G. Georgakas. 2020. "Assessment Indexes for Converter P-Q Control Coupling." Energies 13, no. 5: 1144.

Research article
Published: 17 July 2019 in IET Power Electronics
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In this work, the impact of voltage harmonic injection angle on grid current harmonics using a power converter supplied by photovoltaic (PV) array is studied. Converter and PV non-linear operation cause harmonic distortion, which is superimposed to the existing harmonic content of the grid. First, a general mathematical expression connecting voltage harmonic injection angle and current distortion at the same frequency is theoretically proven. This general expression is verified by experimental results for various converter output levels and grid properties, and voltage harmonic injections at various orders and amplitudes. Since the expression is a convex function, there is a unique injection angle that minimises overall current harmonic at the same frequency. The second contribution of this research is that with a minimum of three injections at random angles the parameters of the general expression can be calculated, thus the optimum injection angle can be determined. In comparison to other works, the knowledge of converter harmonic properties, grid harmonic content or grid connection type (inductive, ohmic, mixed) is not needed.

ACS Style

Ioannis D. Bouloumpasis; Panagis N. Vovos; Konstantinos G. Georgakas. Voltage harmonic injection angle optimisation for grid current harmonics using a PV converter. IET Power Electronics 2019, 12, 2382 -2388.

AMA Style

Ioannis D. Bouloumpasis, Panagis N. Vovos, Konstantinos G. Georgakas. Voltage harmonic injection angle optimisation for grid current harmonics using a PV converter. IET Power Electronics. 2019; 12 (9):2382-2388.

Chicago/Turabian Style

Ioannis D. Bouloumpasis; Panagis N. Vovos; Konstantinos G. Georgakas. 2019. "Voltage harmonic injection angle optimisation for grid current harmonics using a PV converter." IET Power Electronics 12, no. 9: 2382-2388.

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.