HARMONIC REDUCTION SYSTEM USING ACTIVE FILTER

In the modern power distribution system, majority of loads draw harmonic currents from ac source. This paper presents the harmonics analysis and compensation which occurred in the electrical system. We use the electrical signal analysis in order to calculate harmonics that occurred in the electrical system mainly because of non linear load. The harmonics are compensated by using active filter. Microcontroller with A/D converter is used for sampling the electrical signals via a parallel port of the computer. The active harmonic filters are controlled by PWM (Pulse Width Modulation) signal from the microcontroller. The PWM data (Switching angle) is programmed by computer. The data such as voltages, currents, the total harmonic distortion etc., can be saved as database for analysis the harmonics compensation increase high efficiency of the electrical system and decrease the damage and incorrect operation that may happen with electrical devices