An Optimized Frequency Scanning Tool for Sub-Synchronous Interaction Analysis of Non-Linear Devices
An Optimized Frequency Scanning Tool for Sub-Synchronous Interaction Analysis of Non-Linear Devices
复制标题
用于非线性设备次同步相互作用分析的优化频率扫描工具
DOI：
10.1109/icps.2019.8733372
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Weijen Lee
中科院分区：
文献类型：
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作者：
I. Matsuo;Farshid Salehi;Long Zhao;Yuhao Zhou;Weijen Lee
频率扫描是电网次同步干扰（SSI）筛选的一种功能强大且通用的方法。在不同的数值和分析频率扫描技术中，谐波注入法非常适合于带有有源元件的黑盒子模型的扫描，例如在风力发电场和太阳能发电厂中。结果可用于SSI风险评估，其中准确性起决定性作用。该方法的理想情况是，每次单频谐波注入执行一次仿真，从而得到最准确的结果。然而，对于具有广泛频率范围的SSI研究和具有非常小时间步长（μs尺度）的仿真，这是以增加仿真时间和财务成本为代价的。本文提出了一种技术，以提高谐波注入法的准确性，通过优化的波峰因数，同时注入所有的频率在一个镜头，从而提高了效率的方法，在相当大的减少仿真时间，同时保持良好的精度。所提出的技术进行了测试，在一个100 MVA的风电场连接到电网通过串联补偿线。频率扫描结果与电磁暂态仿真（EMT）和理想的多个单频注入的情况下，并与其他技术进行了比较。结果表明所提出的方法的准确性和鲁棒性。
Frequency scan is a powerful and versatile approach for Sub-Synchronous Interaction (SSI) screening in power grids. Among different numerical and analytical frequency scan techniques, the harmonic injection method is well suited for the scan of black-box models with active elements, such as in wind farms and solar plants. The results can be used for SSI risk assessment, in which accuracy performs a decisive role. The ideal situation for this method, which leads to the most accurate results, is to perform one simulation per single-frequency harmonic injection. However, for SSI studies with a wide range of frequencies and simulations with very small time steps (scale of μs), this comes at the expense of increased simulation time and financial costs. This paper proposes a technique to improve the accuracy of the harmonic injection method through the optimization of crest factor while injecting all frequencies at one shot, therefore increasing the efficiency of the method by a considerable decrease in simulation time while maintaining good accuracy. The proposed technique was tested on a 100 MVA wind farm connected to the grid through a series-compensated line. The frequency scan results were benchmarked with both Electromagnetic Transient Simulation (EMT) and the ideal multiple single-frequency injection case and compared with other techniques. The results are indicative of the accuracy and robustness of the proposed method.