A wide frequency range control strategy for medium voltage DC access is proposed for doubly-fed wind power generation system with stand-alone operation. Compared with the traditional line-commutated converter (LCC) DC connection, through the coordinated control of the rotor side converter and the grid converter of the doubly-fed wind generator, the stator frequency changes in a wide range with the wind speed, while keeping the stator flux unchanged, so as to realize the efficient operation of the doubly-fed wind generator. Simulation is carried out with the wide frequency range control strategy of a single 1.5 MW doubly-fed wind generation. The simulation results show that in the maximum wind energy tracking region from the cut-in wind speed to the rated wind speed, wide frequency range control can be achieved, and the efficiency is improved in the whole wind speed range.