Research on Transient Overvoltage Mechanism Considering Phase-Locked Loop and Current Loop

After the AC short circuit of the renewable generators grid-connected system is cleared, the renewable generators transient overvoltage, and it is urgent to carry out research on the mechanism of transient overvoltage. Firstly, this paper establishes a renewable generator grid-connected model based on the low-voltage voltage ride-through strategy, and studies the phase jump characteristics of the terminal voltage of the renewable generator after the fault is cleared. Secondly, the mechanism and influencing factors of transient overvoltage generated by new energy are analyzed. Finally, the influence of the reactive and active current during the fault and the sudden change of the current reference value after the fault clearance on the transient overvoltage is verified by simulation.