Research on Control Strategies for Photovoltaics Actively Building and Supporting the Grid

In order to achieve the future dual carbon goals, the proportion of new energy generation is increasing, and replacing fossil fuels has become an inevitable trend in future development. However, new energy grid connected generation has asynchronous properties and cannot actively support the power grid and provide inertia. Therefore, with the help of grid-forming converters, a active standby control strategy combining variable load shedding rate and virtual power frequency is proposed. By changing the load shedding rate, by deviating the maximum power point of the photovoltaic system and retaining a certain amount of active power reserve, virtual synchronous generator (VSG) control strategy with inertia frequency modulation characteristics is introduced into the MPPT control algorithm, so that the grid-forming photovoltaic converter can operate stably in the face of photovoltaic or grid frequency disturbances. The final results show the effectiveness of the control strategy designed in this paper.