Reference generation techniques for active power line conditioners

Reference generation is very important in the control of power line conditioners. This paper presents some algorithms both for single-phase and three-phase systems very suitable for reference generation and digital implementation. The key of the proposed algorithm is the implementation and tuning of Moving Average FIR filters (MVAs). Thanks to the rapid step-response and good harmonic/noise cancellation of MVAs, proposed algorithms have a very good performance both in steady-state and under transients. A frequency adaptive filter configuration has also been proposed in order to improve the dynamics of the algorithms under input frequency shifts from the nominal one. Zero steady-state phase error is achieved with this configuration. A prototype of Active Power Filter (APF) and its control has also been proposed and implemented in a rapid prototyping platform (dSpace DS1103). This prototype is based on a feedforward control scheme implementing a current controller suitable for harmonic compensation. The reference generation of this control algorithm is based on the previous approaches. Experimental results prove the suitability and high performance of the proposals.