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In order to solve the problem that different types of wind turbines accessing to the power gird has great influence on protection configuration and setting calculation, a fault current calculation model of doubly-fed induction generator under rotor excitation control was established when symmetric or asymmetric fault occurs in grid. Combined with fault current calculation models of direct-driven wind turbine generator and doubly-fed induction generator with crowbar protection, this paper establishes fault current calculation models of direct-driven wind turbine generator and doubly-fed induction generator, respectively. It is based on iterative solution by nodal voltage equation, fault boundary conditions and fault current calculation models of distributed generators. At last, the accuracy of the fault analysis method is verified by digital simulation.

A Novel Fault Analysis Method of the Power Grid with Different Types of Wind Turbines