| A fuzzy logic controller for an active power line conditioner (APLC) is described. Frequency-domain analysis is used to determine the desired compensation current, and a rule-based piecewise linear fuzzy proportional-integral (PI) controller provides the appropriate switching pattern of the APLC to generate the actual compensation current. MATLAB simulations and experimental measurements on a low-power, digital signal processor (DSP) based, hardware prototype show that the proposed APLC can give good results despite the use of a relatively low switching frequency, which is necessary to minimize semiconductor switching losses. The simulations and measurements agree very well and show that the APLC/fuzzy PI controller system can improve both total harmonic distortion and power factor during both steady-state and transient operating conditions. |
