A novel power control scheme for distributed DFIG based on cooperation of hybrid energy storage system and grid-side converter.

• A power control scheme is proposed for distributed DFIG based on cooperation of HESS and GSC, which can effectively control the overall output power of the distributed system. And it can reduce the voltage fluctuation in the DN. • The SOC state of HESS is considered to adjust the pitch angle control and power dispatching command. This can avoid overcharging and over-discharging of the HESS to maintain long-term operation for managing output power. • The SMES with high power density is used to deal with high-frequency power by controlling the DC-link voltage of DFIG. It enhances the stability of DC-link voltage and extend the battery's service lifetime. • Finally, the model of distributed DFIG and HESS is built in RTDS platform, and the simulation results are analyzed for verifying the effectiveness and superiority of the proposed scheme. Due to the uncertainty of wind energy, the wind power is difficult to be dispatched and may cause the voltage fluctuations for distributed network. Therefore, a novel power control scheme is proposed to manage the output power of the distributed doubly-fed induction generator (DFIG) by cooperating the hybrid energy storage system (HESS). In the proposed scheme, the grid-side converter of DFIG is controlled to manage overall output power of the DFIG/HESS hybrid system in accordance to the power dispatching command. The HESS is utilized to deal with the power difference between DFIG generation power and the power dispatching command. The HESS is embedded in the DC-link bus of DFIG and is composed of superconducting magnetic energy storage and batteries. Additionally, in order to avoid HESS from overcharging and over-discharging, the pitch angle control and power dispatching command are adjusted by considering the state of charge (SOC) of HESS. Finally, the simulation model of distributed DFIG and HESS is built on the real-time digital simulation (RTDS) platform, and the simulation results validate the effectiveness and reliability of the proposed power control scheme. [ABSTRACT FROM AUTHOR]