ANALYSIS OF LVRT CHARACTERISTICS AND TRANSIENT OVERVOLTAGE SUPPRESSION OF DFIG-BASED WIND TURBINES CONSIDERING PHASE ANGLE JUMP
Firstly,based on the grid-connected doubly-fed induction generator(DFIG)model,this paper analyzed the phase angle jump characteristics of DFIG terminal voltage after grid short circuit fault.Then by analyzing the transient response characteristics of the phase-locked loop(PLL)under phase angle jump,the formation mechanism of transient overvoltage after fault recovery was revealed.On this basis,the influence of PLL phase-locked error on the LVRT characteristics of the wind turbines was analyzed.Finally,an improved control strategy for rotor-side converter(RSC)and PLL was proposed according to the voltage phase angle jump characteristics after fault recovery,which realized the active suppression of transient overvoltage by wind turbines and improved the stability of the wind power transmission system.
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