摘要
针对当前机电暂态仿真中直流输电系统对交流侧不对称故障计算结果误差较大的问题,提出一种数据驱动的机电直流输电系统恢复特性曲线修正方法。利用机电-电磁混合仿真获取特性曲线并对其进行截取、无扰动不平校验和归一化等预处理从而构造恢复特性样本库。基于流形假设提出了基于优先级的近邻搜索,即利用待修正样本的仿真数据特征量在样本库中得到近邻样本。根据受限动态时间规整算法提出近邻样本曲线融合算法。综合上述研究成果,完成直流系统恢复特性曲线修正方案。实际电网算例仿真结果表明,所提方案能有效实现修正,为机电暂态仿真中直流输电系统的处理提供新的思路。
Aiming at the problem that the high voltage direct current(HVDC) system has a large calculation error in electro-mechanical transient simulation when the asymmetry fault occurs on the AC side, a method of revising the electro-mechanical recovery characteristic curve of the HVDC transmission system driven by data is proposed. The recovery characteristic curve is obtained by electro-mechanical and electromagnetic hybrid simulation and be pre-processed through interception, numerical stability check and normalization, to construct the recovery characteristic curve sample library. Based on the assumption of the manifold, a neighbor search based on priority is proposed, which uses the simulated data feature quantity of the uncorrected sample to get the neighbor sample in the sample library. A near neighbor sample curve fusion algorithm is proposed based on the restricted dynamic time warping algorithm. Based on the above research results, the HVDC system recovery characteristic curve correction scheme is completed. The simulation results show that the proposed scheme can effectively correct and provide innovative ideas for the processing of HVDC system in electro-mechanical transient simulation.
引文
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