This technical note provides an overview of Active Power Filters (APFs) designed for harmonic mitigation and specifically targeting three-phase grid-connected inverters. The note begins by…
This technical note presents some of the most common grid synchronization methods for power converters connected to the grid. These different methods allow the power…
This note provides insights into the operating principle of a synchronous reference frame PLL (SRF PLL), also known as DQ-type PLL. An implementation of an…
A proportional resonant control can be seen as the implementation of PI controllers within a rotating reference frame (dq), which allows to re-locate the infinite DC gain at desired frequency.
Second-order Generalized Integrators (SOGI) have recently been proposed for use as phase detectors for PLL implementations. These structures are essentially notch filters (band-pass) that can be easily tuned to the grid frequency.
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