The traditional fault control strategy of converter-interfaced renewable energy sources (CIRESs) may bring about a lower sensitivity level or misoperation of fault component-based directional elements. To overcome this problem, a new control scheme is proposed to adjust sequence impedance angles of CIRESs by computing suitable current references of the CIRES controller. Meanwhile, these current references are maximized by an iterative algorithm to make full use of the short-circuit capacity of CIRESs. The proposed control scheme is applicable to various faulty conditions such as different fault types, power factors, weak grids, and larger fault resistances. Compared with the new directional elements that need to update protection algorithms, the proposed control strategies can make CIRESs compatible with the existing directional elements whilst the necessary fault ride-through (FRT) requirements can still be satisfied. Furthermore, all the controller parameters are not required to be revised based on the detected fault type, even with only local measured data collected. The associated PSCAD simulations, real-time digital simulator (RTDS) testing and the downscale hardware experiment verify the proposed method.

中文翻译：

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一种改善方向保护元件运行的转换器接口源控制方法

传统的转换器接口可再生能源（CIRESs）故障控制策略可能会导致基于故障分量的方向元件的灵敏度水平较低或误操作。为了克服这个问题，提出了一种新的控制方案，通过计算 CIRES 控制器的合适电流参考来调整 CIRES 的序列阻抗角。同时，这些电流参考通过迭代算法最大化，以充分利用 CIRES 的短路能力。所提出的控制方案适用于各种故障情况，例如不同的故障类型、功率因数、弱电网和较大的故障电阻。与需要更新保护算法的新型方向性元件相比，所提出的控制策略可以使 CIRES 与现有的方向元件兼容，同时仍然可以满足必要的故障穿越 (FRT) 要求。此外，即使只收集本地测量数据，也不需要根据检测到的故障类型修改所有控制器参数。相关的 PSCAD 仿真、实时数字仿真器 (RTDS) 测试和缩减硬件实验验证了所提出的方法。