【目的】针对风电机组宽频阻抗在线测量中精度与效率难以兼顾的技术难题，本文提出一种融合关键频率靶向高精度注入与宽频阻抗迁移重构的混合测量方法。【方法】首先，基于目标风电机组构建标准仿真模型，获取其全工况宽频阻抗数据模型；然后，筛选关键频率点集，并通过单正弦信号靶向注入在线获取目标风电机组在关键频率点的阻抗数据；最后，利用迁移重构技术将离散的关键频率点阻抗拓展至目标频段，实现风电机组宽频阻抗特性的快速在线测量。【结果】通过仿真与控制器硬件在环试验，验证了所提混合测量方法的有效性。试验结果表明，在30 dB噪声的影响下，该混合测量方法的测量精度与传统单正弦扫频法相当，而测量耗时缩短85%以上。【结论】所提混合测量方法在保留单正弦信号注入高精度优势的同时，显著减少了在线测量频率点，从而有效提升了测量效率。

[Objective] Aiming at the technical challenge of balancing the accuracy and efficiency of online wideband impedance measurement of wind turbines, this paper proposes a hybrid measurement method that integrates key frequency targeted high-precision injection and wideband impedance transfer reconstruction. [Methods] Firstly, the standard simulation model was constructed based on the target wind turbines to obtain its all-operating-conditions wideband impedance data model. Secondly, the key frequency point set was screened, and the impedance data of the target wind turbines at the key frequency points were obtained online via targeted injection of single-sine signals. Finally, the discrete key frequency point impedance was extended to the target frequency band by employing transfer reconstruction technology, and fast online measurement of wideband impedance characteristics of the wind turbines was realized. [Results] The effectiveness of the proposed hybrid measurement method was verified by simulation and controller hardware-in-the-loop experiments. The experimental results showed that under the influence of 30 dB noise, the measurement accuracy of the proposed hybrid measurement method was comparable to that of the traditional single-sine frequency sweep method, while the measurement time was reduced by more than 85%. [Conclusion] The proposed hybrid measurement method significantly reduces the online measurement frequency points while retaining the high-precision advantages of single-sine signal injection, thus effectively improving the measurement efficiency.

国网冀北电力有限公司科技项目(52018K240009)