Analysis On The Low Voltage Ride Through Technology Of DFIG

19721212

Abstract:
- K# p( u+ u) z  w$ Y, M* _With the wind power installation capacity sharply increasing, the effects caused by large wind farms on the regional power system stability are becoming more and more remarkable. Accordingly, a mass of researches are focused on the low voltage ride through (LVRT) technology used for DFIG under short-time grid fault, and new power grid regulation requires power system to have LVRT capability. First, the applying and requirement of LVRT is introduced, and the electromagnetism relationship (DFIG terminal voltage, stator flux, rotator flux) of DFIG stability factor under symmetrical grid fault is analyzed. Then based on the electric power system software PSCAD, the DFIG performance characteristic is analyzed under different grade symmetrical grid fault, the relationship between voltage、current、torque is find out, recur to this experiment some useful conclusions are put forward after the above analysis, hope can provide help for subsequent researches.