In response to the needs of power quality governance in production site

this paper designs a high power quality combined compensation system with capacities of correcting power factor

mitigating harmonic current and restraining harmonic resonance. A hybrid injection structure system is presented for restraining resonance and improving passive power filter's performances. AS the topology and operating principles of the system analyzed

its steady compensation characteristic and dead effect compensation are discussed in detail. Theory analysis and field running results both prove that the proposed system can effectively resolve the integrated demand of harmonic mitigation and reactive power compensation in highpower load conditions

and it has a good engineering application effect.