Brushless double-feed induction generator rotating speed estimation system

The invention discloses a brushless double-feed induction generator rotating speed estimation system, and belongs to the field of a brushless double-feed induction generator control technology, for the purposes of omitting a rotating speed sensor and a rotor position sensor in a conventional brushless double-feed induction generator control system, improving the operation robustness of a brushless double-feed induction generator and decreasing the hardware cost and the maintenance cost of the system. The system comprises a voltage transformation module, a current transformation module, a PW voltage positive-sequence fundamental wave extractor, a CW current fundamental wave extractor, a voltage amplitude normalization module, a current amplitude normalization module, a phase mixer and a rotor position phase-locked loop. The system provided by the invention is applied to a brushless double-feed induction generator independent generating mode and is also applied to a grid-connected generating mode; and the system can be applied to rotation speed estimation during zero-load operation of the brushless double-feed induction generator and can also be applied to rotating speed estimation under the conditions of a three-phase symmetrical load, an asymmetric load and a rectifier bridge load.