Abstract: When distributed photovoltaic power stations are connected with distribution network, the shortage of reactive power adjustment capacity, obvious voltage fluctuation and too much harmonics will directly impact the safety in operation of power grid and power quality. Take the distributed photovoltaic grid-connected inverters as research objectives, combine the change of PV electricity and load build up some kind of active compensation technology such as separate inv adjustment, hybrid coordination compensates among several different devices, multi-times scale compensation in whole. By improving inverter control schemes, installing static var generators and active power filters, building a hierarchical cooperative control system, etc., the problems with conventional compensation methods that have slow responses, poor compensation accuracies, weak harmonic suppression effects, and so on can be resolved. With regard to relying upon the 5.36 MW industrial distributed photovoltaic, carry out all kind of engineering work and prove that if adopted this technology can achieve a stable power factor at connection point will be more than the value 0.94 situation, limit voltage fluctuations no more than ±2.5%, total harmonic distortion decrease less than 3%, reduce system response time to lower than 20ms, fully comply with standard of connect grid for enterprises requirements of power usage. It will give out some technical references for the others like similar distributed photovoltaic transformation on reactive power optimization and also more large-scale and reliable connection to a public grid.