Hierarchical Modeling Scheme for High-Speed Electromagnetic Transient Simulations of Power Electronic Transformers
Hierarchical Modeling Scheme for High-Speed Electromagnetic Transient Simulations of Power Electronic Transformers
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DOI：
10.1109/tpel.2021.3061421
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发表时间：
2021-02
影响因子：
6.7
通讯作者：
M. Feng;Chenxiang Gao;Jiangping Ding;Hui Ding;Jianzhong Xu;Chengyong Zhao
中科院分区：
文献类型：
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作者：
M. Feng;Chenxiang Gao;Jiangping Ding;Hui Ding;Jianzhong Xu;Chengyong Zhao
电力电子变压器（PET）在电力系统中的广泛应用对PET的电磁暂态（EMT）仿真提出了挑战。在EMT程序上对PET进行详细的EMT仿真的计算时间是不可接受的，这是由于大的电节点数、微秒范围的仿真步骤以及器件和变压器的高开关频率。本文提出了一种层次化的PET建模方案。与现有的建模方法不同，该方法递归地降低了导纳矩阵的维数，以获得每个相腿的广义诺顿等效。覆盖在外部系统导纳矩阵上的最终导纳矩阵具有比未简化结构的尺寸显著小的尺寸数量级。通过与中压直流系统的详细EMT模型的比较，在PSCAD/EMTDC中评估了所提出的方案在各种工作条件下的性能。在精度损失可以忽略不计的情况下，实现了比简单的EMT程序大约一到两个数量级的加速。
The extensive application of the power electronic transformers (PETs) in power systems poses a challenge as the accurate and high-speed electromagnetic transient (EMT) simulation of PET has been a critical issue. The computational time of the detailed EMT simulation of PET on EMT programs is unacceptable due to the large electrical node count, microsecond-range simulation steps, and high switching frequency of the devices and transformers. This article proposes a hierarchical modeling scheme for PET. Unlike the existing modeling methods, the proposed technique recursively decreases the dimension order of the admittance matrix to obtain the generalized Norton equivalent of each phase leg. The final admittance matrix overlaid onto the external system admittance matrix has a dimension order of magnitude remarkably smaller than that of the unreduced structure. By comparison with a detailed EMT model of a medium-voltage dc system, the performance of the proposed scheme has been assessed in PSCAD/EMTDC under various working conditions. With negligible loss of accuracy, approximately one to two orders of magnitude speedup over a straightforward EMT program is achieved.