This work proposes an enhanced control approach relying on the synchronverter concept for wind energy conversion systems (WECSs) based on the doubly-fed induction generator (DFIG). It consists of incorporating a virtual filter resistor into the control loop of the synchronverter, which is associated with the grid-side converter (GSC) aiming at emulating the behavior of a synchronous generator when providing ancillary services such as frequency support. A comprehensive state-space representation is derived to demonstrate that the virtual filter resistor is essential to ensure stability. After the proper adjustment of the model, it is possible to verify the effectiveness of the synchronverter-based control applied in the IEEE 14-bus modified system employing parameters obtained from a real power plant. The results show that the application of the introduced method results in less severe frequency dips and faster transient response during frequency support even when compared with the case in which only synchronous machines are connected to the grid.

中文翻译：

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基于同步逆变器的控制方法在基于 DFIG 的风能转换系统中的稳定性分析和应用

这项工作提出了一种基于双馈感应发电机（DFIG）的风能转换系统（WECS）的同步逆变器概念的增强控制方法。它包括将虚拟滤波电阻器合并到同步逆变器的控制环路中，同步逆变器与网侧变流器（GSC）相关联，旨在在提供频率支持等辅助服务时模拟同步发电机的行为。导出了全面的状态空间表示，以证明虚拟滤波器电阻对于确保稳定性至关重要。在对模型进行适当调整后，可以使用从实际发电厂获得的参数来验证在 IEEE 14 总线修改系统中应用的基于同步逆变器的控制的有效性。结果表明，即使与仅同步机并网的情况相比，应用所引入的方法也能在频率支持期间实现更小的频率暂降和更快的瞬态响应。