A novel doubly-fed wind power generation system

which integrates an energy storage system (ESS) in the direct current side of the back-to-back converter of traditional doubly-fed wind power generation system

is proposed. The output power fluctuation at the point of common coupling of the wind power generation system

which is caused by the wind speed randomization

can be effectively suppressed by carrying out the power control strategy on the back-back converter. Based on the analysis of system composition and functions

the power control strategy for the back-back converter is proposed. Detailed study and analysis are given using EMTDC/PSCAD simulations with the test platform of a 3 kW doubly-fed wind power generation system. The proposed control model of the novel doubly-fed wind power generation system is used in the study. Results show that

in the case of the wind power fluctuation

this system can have the smooth power output achieved by the optimized control strategy

and the intermittency the wind power has been effectively reduced.