Method and device for determining phase signal during low voltage ride through of photovoltaic system

The invention belongs to the technical field of photoelectricity, and provides a phase signal determination method and device during low voltage ride through of a photovoltaic system and electronic equipment, and the method comprises the steps: enabling the photovoltaic system to carry out the low voltage ride through when a power grid fault is detected, and collecting the output voltage Ut of an inverter; performing dq coordinate transformation on the inverter output voltage Ut to obtain a d-axis component Utd and a q-axis component Utq, setting a d-axis orientation mode of the power grid voltage, and calculating the value of the Utq; and feedforward compensation voltage is set in a phase-locked loop of the photovoltaic system, and the value of Utq is adjusted to be 0, so that the phase-locked loop collects a phase signal of the fault point. According to the invention, the problem that the phase-locked loop can not accurately acquire the phase signal of the power grid, namely the synchronization is lost, whe