Inertia synchronization control is a good solution for type-IV wind turbine to provide an inertia response to the grid. To further improve its frequency support performance, this paper addresses a battery energy storage unit on the DC link side of the full power back-to-back wind energy converter. After that, the corresponding modified control strategy is implemented as an upgraded version of existing inertia synchronization control from the view of emulating the behavior of a traditional synchronous generator widely used in power system for decades. Moreover, a control method based on removable virtual resistors co-operated with reconfiguration of battery energy storage unit’s control structure is studied in detail to improve the low voltage ride through performance of the wind turbine. Simulation results are obtained based on the environment of PSCAD/EMTDC, which can certify the correctness and feasibility of the presented control method in this paper.

惯性同步控制是IV型风力发电机向电网提供惯性响应的良好解决方案。为了进一步提高其频率支持性能，本文介绍了全功率背靠背风能转换器直流侧的电池储能单元。之后，从模仿数十年来在电力系统中广泛使用的传统同步发电机的行为的观点出发，将相应的修改后的控制策略实现为现有惯性同步控制的升级版本。此外，详细研究了基于可拆卸虚拟电阻器与电池能量存储单元控制结构的重新配置相配合的控制方法，以提高风力涡轮机的低压穿越性能。