Abstract: This paper proposes a kind of voltage regulation,reactive power compensation and harmonic suppression distribution network power quality control devices.The causes of system harmonic amplification and suppression strategies are analyzed,integrated control model is established for wattless voltage harmonic and optimization control algorithm.The simulation results verify the validity and rationality of the control strategy.

Key words: voltage reactive-power control, power quality, resonant impedance type hybrid active filter, harmonic suppression