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Fuzzy logic controlled shunt active power filter for power quality improvement

Fuzzy logic controlled shunt active power filter for power quality improvement

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The simulation and experimental study of a fuzzy logic controlled, three-phase shunt active power filter to improve power quality by compensating harmonics and reactive power required by a nonlinear load. The advantage of fuzzy control is that it is based on a linguistic description and does not require a mathematical model of the system. The fuzzy control scheme is realised on an inexpensive dedicated micro-controller (INTEL 8031) based system. The compensation process is based on sensing line currents only, an approach different from conventional methods, which require harmonics or reactive volt-ampere requirement of the load. The performance of the fuzzy logic controller is compared with a conventional PI controller. The dynamic behavior of the fuzzy controller is found to be better than the conventional PI controller. PWM pattern generation is based on carrierless hysteresis based current control to obtain the switching signals. Various simulation and experimental results are presented under steady state and transient conditions.

Inspec keywords: power harmonic filters; power system harmonics; reactive power control; fuzzy control; compensation; power system control; control system analysis; microcontrollers; power supply quality; active filters

Other keywords: nonlinear load; carrierless hysteresis based current control; three-phase shunt active power filter; control performance; reactive power compensation; PWM pattern generation; micro-controller; harmonics compensation; switching signals; fuzzy logic control simulation; power quality improvement

Subjects: Power system control; Fuzzy control; Microprocessors and microcomputers; Control of electric power systems; Power supply quality and harmonics; Microprocessor chips; Control engineering computing; Active filters and other active networks; Power and energy control; Power engineering computing; Other power apparatus and electric machines

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