A novel hybrid detection approach for series compensation under grid perturbation

In this paper a novel hybrid harmonic compensation approach for non-linear loads is developed and analysed. This technique provides compensation for current harmonics coming from a nonlinear load and reactive power regulation even during grid´s voltage disturbances. The method could be implemented on any Series Active Filter. Meanwhile the Transformerless configuration (TSeAF) is selected in this work to address power quality issues of a non-linear load. In the first step the source current distortions are extracted from the sensed nonlinear load currents. Then, to improve the compensation´s behaviour this new strategy uses voltage harmonic distortions to make the grid current remain as clean as possible with a small gain G proportional to current harmonic components. The strategy is evaluated on an Ideal CSC non-linear load. Then a single-phase bridge rectifier with R-L load is taken as the nonlinear load. This strategy operates in regular conditions, while it keeps a perfectly sinusoidal current wave form during disturbances initiated by the grid. Simulations results confirm the effectiveness of the proposed method.