1. The randomness, intermittency and periodicity of light resources will make the power generation of photovoltaic power plants have a greater impact on the power grid.
2. The photovoltaic power generation is connected to the grid through the power electronic inverter, which is easy to generate harmonics and three-phase current imbalance, and the randomness of the output power is easy to cause the grid voltage to fluctuate and flicker.
3. When the proportion of photovoltaic power generation in the power supply continues to increase, it will affect the peak regulation capacity of the power grid.
4. With the continuous increase of the number and scale of photovoltaic power plants, the fluctuation of illumination and periodic changes cause the voltage of the transmission line to rise, and the voltage stability of long-distance power transmission.
5. When photovoltaic power generation is connected to the distribution network, the distribution network system changes from a radial structure to a multi-power supply structure, and the magnitude, flow direction and distribution characteristics of the power flow and short-circuit current will change.
6. The photovoltaic power generation system fails in the line, affecting the action of relay protection and reclosing.