In order to reduce the electromagnetic transient simulation of large scale wind generator group, the state space model of DFIG wind generator group with crowbar in synchronous coordinate is introduced firstly, and the equivalent scheme of DFIG wind generator group using H￥ norm optimization is discussed. The scheme can reduce the state variables and minimize the fault electric quantity H￥ norm error of the equivalent model and original model, which has the different parameters and states. Then, the Cone Complementary Algorithm which transforms the order reduction to non-convex optimization is presented to get the equivalent model. The initial value of the non-equilibrium equivalent model is decided with a method based on the corresponding differential equality finally. Simulation shows that the proposed scheme can achieve the equivalent model and the reduction error.