Design and Application of the Coordinated Regulation System for Distributed Hydro-PV Complementation Combined with Load Resources

In recent years, with the continuous increase of the installed capacity of distributed PV systems, the issue of county-level power grids lacking of technical management and control methods of distributed energy sources has been acquired more and more attentions. It has also been noticed that a large number of scattered small hydro-power stations do not play an important role during peaking operation. Aiming at the coordinated management and control of distributed small hydro-power stations, PV systems, demand-side flexible resources, a coordinated regulation system for distributed hydro-PV complementation combined with load resources has been developed. The system includes three major functional modules: a resources aggregation module, an output forecast module, and a coordinated optimization regulation module. Therefore the system has capability of coordinated optimizing and making full, efficient utilization of various resources, inclusive of small hydro-power stations, PV systems, energy storage systems, and user-side flexible loads. The system was demonstrated in Hunan Province, and the demonstration results showed that the system can effectively improve the peaking capability of the power grid, promote the consumption level of clean energy, and lower the energy cost for users, and also provide a new resolution to enhance the grid's flexibility and reliability.