Anti-Aliasing Filter in Digital Control System for Converter with Active Power Filter Function

Anti-aliasing filters used to exclude mixing spectra in systems with digital signal processing. Electric power converters, especially active power filters, with digital control system are hard real-time systems. Such systems apply additional restrictions to the response of anti-aliasing filters. The paper defines features of the use of anti-aliasing filters in power converter systems and shows some sources of control errors. The requirements to the characteristics of filters, depending on the spectral composition of the input signal have been formulated. In paper given mathematical modeling results of the most common types of anti-aliasing filters from point of view to influence to digital control systems.