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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.
Panagis N. Vovos; Ioannis D. Bouloumpasis; Konstantinos G. Georgakas. Assessment Indexes for Converter P-Q Control Coupling. Energies 2020, 13, 1144 .
AMA StylePanagis N. Vovos, Ioannis D. Bouloumpasis, Konstantinos G. Georgakas. Assessment Indexes for Converter P-Q Control Coupling. Energies. 2020; 13 (5):1144.
Chicago/Turabian StylePanagis N. Vovos; Ioannis D. Bouloumpasis; Konstantinos G. Georgakas. 2020. "Assessment Indexes for Converter P-Q Control Coupling." Energies 13, no. 5: 1144.
The aim of this paper is to present a multipurpose converter, appropriate for non-grid-connected microsystems, which are prone to harmonic distortion. The converter suppresses harmonics by injecting mirror harmonics in the modulation stage. An important property is that it continuously monitors and significantly reduces the harmonic content without the use of active or passive low-frequency filters. This is under constant switching frequency, no matter if the harmonics are mainly created by the source, the loads or even its own operation. The converter is regulating output voltage using typical fuzzy control. The two types of control (harmonic and voltage) do not seem to affect each other during operation. Furthermore, it can supply either dc or ac loads from a dc source. The versatility of the converter is a useful property for remote or mobile micropower systems, where neither sources nor loads are of a single type. The converter has been tested successfully for a combination of harmonic-injecting electric appliances and various load step changes.
Panagis N. Vovos; Konstantinos G. Georgakas. Multipurpose Power Converter for Non-Grid-Connected Microsystems. ENERGYO 2018, 1 .
AMA StylePanagis N. Vovos, Konstantinos G. Georgakas. Multipurpose Power Converter for Non-Grid-Connected Microsystems. ENERGYO. 2018; ():1.
Chicago/Turabian StylePanagis N. Vovos; Konstantinos G. Georgakas. 2018. "Multipurpose Power Converter for Non-Grid-Connected Microsystems." ENERGYO , no. : 1.
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.
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 StyleIoannis 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 StyleIoannis 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.
This study suggests a sine-wave modulation technique to achieve low total harmonic distortion (THD) of a buck-boost converter connected to a changing polarity inverter. First, we present the main characteristics of the converter's topology. Then, we describe how the suggested modulation improves the harmonic content of the output in comparison to the previously used technique, whether harmonics are caused by the inductive nature of the source (e.g., domestic wind turbine) or they are created from external sources at the point the converter is connected (e.g., grid). A prototype was built and the efficiency of the method to tackle harmonics was experimentally verified. Experimental results demonstrate the ability of the method to drastically reduce THD, in comparison with the previous modulation method, so that the output complies with the 5% limit without the use of filters.
Konstantinos G. Georgakas; Panagis N. Vovos; Nicholas A. Vovos. Harmonic Reduction Method for a Single-Phase DCAC Converter Without an Output Filter. IEEE Transactions on Power Electronics 2013, 29, 4624 -4632.
AMA StyleKonstantinos G. Georgakas, Panagis N. Vovos, Nicholas A. Vovos. Harmonic Reduction Method for a Single-Phase DCAC Converter Without an Output Filter. IEEE Transactions on Power Electronics. 2013; 29 (9):4624-4632.
Chicago/Turabian StyleKonstantinos G. Georgakas; Panagis N. Vovos; Nicholas A. Vovos. 2013. "Harmonic Reduction Method for a Single-Phase DCAC Converter Without an Output Filter." IEEE Transactions on Power Electronics 29, no. 9: 4624-4632.