Abstract:

A shunt three phase power factor correcting scheme was presented. An optimized active power filtering algorithm and high speed space vector pulse width modulation (SVPWM) theory were used to achieve unity power factor without destroying the structure of electronic facility. The scheme improves both synchronous detection frequency and dynamic response of the PWM inverter, and reduces switching losses. Current voltage synchronization and complete compensation of harmonic currents are realized under distorted voltage conditions. Theoretical analysis and experiment results have verified its feasibilities of this scheme. 

Key words: active power filtering algorithm, SVPWM, phase-locking technology, power factor