Double side control of wound rotor induction machine for wind energy application employing half controlled converters

A double side converter fed wound rotor induction machine control for a wind energy application is proposed in this paper. In order to reduce the cost of a wind generator system, a new configuration using half controlled converters for both the stator and rotor circuit as well as for the line side is proposed. The proposed controller reduces the required KVA rating of both machine side and line side converters, improves the efficiency of the wind generator, helps operating over a wide speed range and supports near unity power factor interface with the grid. It is shown that the combined KVA rating of both the machine side converters are even less than that of the machine side converter for a conventional rotor side control configuration. Also, both stator and rotor side being connected to the grid through two power stages, the system will be least affected by the fault or disturbances in the gird. The proposed configuration is simulated for a 30 kW wound rotor machine in SABER and the simulation results are presented.