Abstract: The integration of large and medium-sized pv power station to the power grid brings a big problem and new challenges to the stability and scheduling of electric power system. The successful development and application of reactive remote-dispatching operation technology based on phase-modulation control of the inverter will totally change the traditional conception of reactive power compensation for pv power station. It has been theoretically and practically confirmed that the pv power station installed with the converter can meet the demand of national standards (GB/T 19964-2012 “Technical requirements for connecting photovoltaic power station to power system”), and extra SVCs or SVGs are not needed, and the reactive power generation range and the dynamic response time of this kind of pv power station are good enough to meet the demand of power grid on integration of new power sources. It will save large amount of investment for buliding expensive pv power stations, and avoid power loss in running reactive compensation devices.

Key words: PV power stations, inverter, phase modulation control, self-healing ring network, cluster control, instantaneous power theory, dynamic response time