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In this paper is presented a comparative analysis between two power conditioners connected to a four-wire micro-grid. The first one was developed on a two levels voltage structure and the second one on a three-level voltage NPC structure (Neutral Point Clamped), both controlled by the same strategy. The main objective of the proposed strategy is to limit the disturbance produced by different loads...
This paper present a possible solution to reducing the voltage sags in microgrid. A micro-grid is a weak electrical grid which can be easily subjects to disturbances. In order to improve the operation of the microgrid short-term storage are used. In terms of improving the Power Quality (PQ) it is need to come up with the solution of the power failures and temporary disruption (voltage sags). This...
This paper presents a three-phase Active Power Conditioner to improve power quality in microgrids based on renewable energy. A microgrid is a weak electrical grid which can be easily subject to disturbances. The Active Power Conditioner (APC) presented in this paper acts as an interface between renewable energy sources and the AC bus of a microgrid and uses an improved control strategy, which makes...
In this paper, indirect control theory is proposed for a 4-leg shunt active power filter (SAPF) to compensate reactive power and balance the load currents. The control for the fourth leg is made different from the other authors by using 0 as the neutral current reference. All simulations performed by using Matlab-Simulink show the effectiveness of the proposed solution.
The paper proposes to analyze a real case study from Galati town power delivery system. The study will consider a technical solution to save power losses using an adequate harmonics filter together with a reactive power correction system. The solution conducts calculations with the objective to minimize the total power losses. On this purpose we use an important data base obtained by local power delivery...
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