Abstract
For power grids with abundant small hydropower in China, the efficient switching process between small hydropower and distribution network will help to reduce the user outage time and the cutting of hydropower and load. This paper mainly adopts the simulation method combined with the regulation characteristics of small hydropower in rural areas. And the paper focuses on the amplitude and frequency characteristics of the initial stage of small hydropower. Firstly, the operation characteristics of small hydropower plants are studied, and the simulation model is built. Next, we study the amplitude frequency characteristics of small hydropower stations with better control capability such as leading phase operation. Further, in view of the large number of small hydropower stations with no phase operation capability in the rural power grid, we studied the simulation in the initial stage of the isolated network. By comparing and analyzing the operation characteristics of small hydropower stations at different initial stages under different conditions, it can provide support for small hydropower stations to reconnect into distribution network as soon as possible. This will help to reduce the tedious and long process of grid connection in the rural power grid.
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