Abstract: The proliferation of nonlinear loads and the increasing penetration of distributed energy resources in medium-voltage (MV) and low-voltage (LV) distribution grids make it more difficult to maintain the power quality levels in residential electrical grids, especially in the case of weak grids. Most household appliances contain a conventional power factor corrector (PFC) rectifier, which maximizes the load power factor (PF) but does not contribute to the regulation of the voltage total harmonic distortion (THD V ) in residential electrical grids. This paper proposes a modification for PFC controllers by adapting the operation mode depending on the measured THD V . As a result, the PFCs operate either in a low current total harmonic distortion (THD I ) mode or in the conventional resistor emulator mode and contribute to the regulation of the THD V and the PF at the distribution feeders. To prove the concept, the modification is applied to a current sensorless nonlinear controller applied to a single-phase boost rectifier. Experimental results show its performance in a PFC front-end stage operating in the continuous conduction mode connected to the grid with different THD V .

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