Network construction type photovoltaic fault ride-through control method and device

The invention relates to a network construction type photovoltaic fault ride-through control method and device. The method comprises the following steps: acquiring an outlet voltage of a photovoltaic power station; when the outlet voltage of the photovoltaic power station is smaller than or equal to a first threshold value, starting grid-side inverter control and boost converter control; wherein the grid-side inverter control comprises adjustment of active power and reactive power of the grid-side inverter, introduction of time-varying virtual impedance between voltage virtual internal potential and outlet voltage of the grid-side inverter and adjustment of a voltage reference value in outer loop control of the grid-side inverter, and the boost converter control comprises adjustment of a power reference value of the boost converter. According to the method and the device provided by the embodiment of the invention, a virtual synchronous control rotor motion equation loop can be kept during a fault period, ine