The electromagnetic transient response characteristics analysis of DFIG under grid voltage drop failure

The process of voltage drop and recovery will cause violent electromagnetic transient response of DFIG, which may lead to problems such as generator over-current or over-voltage. This paper gives a deep analysis to the electromagnetic transient response characteristics of DFIG under different grid voltage drop failures. On the basis of establishing mathematical model of DFIG under space vector coordinates, the electromagnetic response characteristics under grid voltage symmetric and asymmetric drop failures are theoretically analyzed, and the specific response characteristics equations are deduced, then the simulation validation of the above theoretical deduction is carried out by using Matlab software. Meanwhile, the differences of DFIG electromagnetic response characteristics under different drop failure types are compared. The relevant factors that influence response degree of different drop types are concluded, which has guiding significance for further study of DFIG-LVRT technology.