[IEEE 2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT) - Weihai, China (2011.07.6-2011.07.9)] 2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT) - Experiment on wind power integration grid via fractional frequency transmission system: Realization of the variable-speed variable-frequency power wind