Flexible control system and method for box-type transformer of photovoltaic power station

The invention discloses a flexible control system and method for a box-type transformer of a photovoltaic power station in the technical field of photovoltaic power generation. The invention aims to solve the problem that a photovoltaic control device at a low-voltage side of a photovoltaic power generation system cannot work normally while the no-load loss of a box-type transformer of a photovoltaic power station in a standby state at night is reduced to be close to zero in the prior art. Comprising a load switch, a step-down transformer, a low-voltage converter, a first alternating current contactor and a double-circuit power supply switching device, and can smoothly adjust high voltage output by a box-type transformer when the photovoltaic power station is started from a standby state, so that no impact current exists in the input process of the box-type transformer on a current collection circuit; meanwhile, smooth quit of the box-type transformers in the standby state of the photovoltaic power station at