Abstract
To improve the low voltage ride-through (LVRT) capability of DFIG, a novel LVRT scheme based on the cooperation of hybrid energy storage system (HESS) and crowbar circuit is proposed. The HESS composed of superconducting magnetic energy storage (SMES) and batteries is connected in the DC-link bus of DFIG. During grid faults, the HESS is switched to stabilize the DC-link bus voltage of DFIG, the grid-side converter (GSC) of DFIG is switched to inject reactive power to the grid for improving the grid fault voltage and the crowbar circuit is activated in real-time to avoid RSC from being damaging according to the rotor current. During normal operation, the HESS is controlled to deal with power difference between the turbine generation power and power dispatching command, and the GSC of DFIG is controlled to manage the output power of the DFIG with HESS. Finally, the simulations of the DFIG with HESS system is conducted in RTDS platform, and the simulation results show that the proposed scheme can effectively achieve the LVRT of DFIG during gird faults and flexibly manage the DFIG output power with HESS during normal operation.
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