Research and Application of Frequency Control Technologies in Power Systems with Distributed Photovoltaics

The large-scale photovoltaic integration into power systems will lead to a reduction in the moment of inertia and a decline in the frequency modulation capability of the power system. The active participation of distributed photovoltaics in power system frequency control is an important measure to solve this problem. In order to ensure the safe and reliable operation of large-scale photovoltaics connected to the power system, distributed new energy connected to the power system should be equipped with the function of participating in the automatic frequency control of the power grid. The performance verification test of the automatic frequency control should be completed after the grid connection operation. The article elaborates on the application configuration and performance evaluation of the distributed photovoltaic participation in the grid frequency control system. The experimental results of the paper indicate that distributed photovoltaics have the ability to automatically participate in grid frequency control and can meet the technical requirements for the safe and stable operation of the power system. In contrast to traditional centralized control, this paper presents a system architecture that offers greater flexibility. The proposed system architecture can be deployed in distributed new energy sites using small, lightweight modules with wireless communication capabilities. This approach enhances deployment flexibility and convenience, reduces system complexity, lowers investment costs, and simplifies debugging processes.