Low THDi controller for current sensorless single phase rectifiers using a two-sample phase locked loop
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AuthorLamo Anuarbe, Paula; Ruiz Robredo, Gustavo A.; Pigazo López, Alberto; Azcondo Sánchez, Francisco Javier
Two-sample phase locked loop (2S PLL) with harmonic filtering capacity is used in a non-linear control (NLC) for a current sensorless Boost power factor corrector (PFC). The objective is to provide the sensorless NLC with a PLL based zero-crossing detector (ZCD) reference to obtain a sinusoidal line current, even under harmonically distorted grid voltages, which requires a proper grid synchronization, especially in the case of weak electrical grids. The resulting line current using the proposed 2S PLL and a ZCD are compared in simulation and experimentally.