A new regulation algorithm applied to a hybrid power filter

In this paper a new control technique based on the least-mean-square (LMS) algorithm is applied to a hybrid power filter (HPF) that is capable of compensating current harmonics and regulating the voltages on radial lines. The hybrid filter combines the efficiency of already installed shunt passive filters with the compensation characteristics of an active power filter. The active filter is composed of a three-phase PWM voltage-source inverter connected in series to the passive filters. The hybrid device is discussed in terms of principle of operation and the proposed control based on the LMS algorithm is designed with stability considerations. Simulation results demonstrate the expected behavior of the proposed control and the overall hybrid power filter performance during both steady state and transient operations.