At present

photovoltaic power generation is one of the power generations with most environmental protection

therefore

the application of grid-connection photovoltaic power station is gradually spread. In this paper

firstly

the system structure and reactive power requirements of photovoltaic power station are introduced

and then the reactive power which is capacitive charging power of cables of the photovoltaic substation at night is obtained through the analysis of 1-day reactive power variation feature of photovoltaic power station. The reactive power in day time has very strong randomness and volatility due to the influence of weather and clouds. Finally

two types of reactive power compensation scheme are proposed in accordance with the reactive power variation feature of photovoltaic power station and also based on whether or not the involvement of reactive power compensation by the photovoltaic inverter. The proposed reactive power compensation scheme is to combine FC/TSC with STATCOM to form dynamic reactive power compensation

which not only meets the needs of reactive power of photovoltaic power station

but also has some economic efficiency.