Autonomous mode switching control method for photovoltaic converter in microgrid system

The invention relates to the technical field of photovoltaic power generation control, in particular to an autonomous mode switching control method for a photovoltaic converter in a microgrid system.The method comprises the following steps: 1, monitoring a DC bus voltage of the photovoltaic converter; 2, when the bus voltage value is within the rated value, enabling the photovoltaic converter toexecute an MPPT algorithm; 3, when the bus voltage value exceeds a first voltage threshold value, enabling the photovoltaic converter to execute a reverse disturbance observation method to limit the power; 4, when the bus voltage value exceeds a second voltage threshold value, enabling the photovoltaic converter to control power by changing the disturbance step length; wherein the step 2 comprisesthe substeps: if the photovoltaic power increment is positive and the voltage increment is positive, continuing to disturb the voltage in the positive direction; if the voltage increment is negative,disturbing the voltage in t