Abstract: Photovoltaic（PV）generation usually operates in maximum power point tracking（MPPT）mode，

which cannot provide inertia and frequency support for the power system. Virtual synchronous generator（VSG）

control is an attractive control method that can provide the similar behavior of synchronous generator（SG）.

However，it is commonly applied to the energy storage system or PV generators with energy storage systems. A

novel PV-VSG control strategy based on active power reserve for single-stage PV generation was proposed. The

principle of the strategy comes from the similarities of the power-angle characteristic curve and the PV array P—V

characteristic curve. PV array voltage is directly regulated based on the grid frequency，and realize control of DC

voltage while providing "spontaneous" inertial response similar to synchronous generators. In addition，a maximum

power estimation method based on real-time short-circuit current estimation was designed，and the additional

sensors and complex estimation algorithms are not required. Integrated with VSG control strategy，the recursive

estimation was implemented. The simulation results in different scenarios have verified the effectiveness and

superiority of the proposed method.

      Key words: virtual synchronous generator（VSG）；active power reserve；inertial response；frequency support；maximum power point estimation