With the construction of new power systems, the "double-high" characteristics of the power grid have a significant impact on its operation and stability characteristics. A standardized design solution for the stability control system of photovoltaic power station grid-connected is proposed, including network communication architecture, software and hardware functional configuration, export mode design and coordination methods. The solution addresses the current limitation where the export of photovoltaics stability control system can only be manually selected between "complete cut-off" or " complete adjustment." The effectiveness of the solution has been demonstrated through its successful implementation in the first hydro-photovoltaic complementary project in China Southern Power Grid. The results of RTDS simulation tests confirm that the designed stability control system enables precise adjustment of fast power modulation. It exhibits short communication delays and demonstrates high reliability in communication networking. Moreover, the system proves its adaptability to various stability requirements of actual power grids.