**6. Conclusions**

Aiming at the problem that the traditional PV-VSG technology relies on external ESSs, which leads to a large increase in the cost of large-scale PV-PPs construction and limits its application in engineering, this paper puts forward PV-PRC-VSG technology. Boosting the converter realizes the active reserve of the PV system, power output can be adjusted to realize the independent frequency modulation of PV system, and DC/AC inverter to achieve power conversion, and reactive power control. The PV system participates in the frequency response of the power system. Through the analysis and experimental verification, the following conclusions are drawn:


**Author Contributions:** The research method and control scheme of this paper was put forward by G.B., and H.T. was responsible for the analysis of the experimental results and the writing of the manuscript of the paper. Special thanks were given to K.D., M.M. and N.W. senior engineers of State Grid Gansu Electric Power Corporation Electric Power Research Institute for their practical engineering background and related data.

**Funding:** This research was supported by State Grid Corporation Science and Technology Project (5227 2217006), and National Natural Science Foundation of China (No. 51267001), and 2018 GanSu university scientific research project - innovation team.

**Conflicts of Interest:** The authors declare no conflict of interest.
