For meeting the need of response speed of dynamic reactive power compensation device in such industries as photovoltaic

wind power and metallurgy etc.

the composition of photovoltaic generating power system and the grid connected characteristics are introduced by taking photovoltaic as an example. The basic principle of fast responsive magnetically controlled reactors（ MCR） is analyzed

several ways of achieving fast response for the MCR is proposed and specific response time is simulated and tested. Solving multiple power quality problems due to grid connected with fast response MCR dynamic reactive power compensation device in photovoltaic plant is proposed. Finally

Adoption of different excitation modes and control strategy as per actual situation of the system in the engineering design is analyzed and summarized so to meet system requirement and reach required response time.