LI Nan,LI Baoluo,ZHU Jianhua,et al.Transient Stability Assessment Method Considering Sample Imbalance and Overlap[J].Automation of Electric Power Systems,2020,44(21):64-71.
LI Nan,LI Baoluo,ZHU Jianhua,et al.Transient Stability Assessment Method Considering Sample Imbalance and Overlap[J].Automation of Electric Power Systems,2020,44(21):64-71. DOI: 10.7500/AEPS20200114005.
Transient Stability Assessment Method Considering Sample Imbalance and Overlap
The stability analysis of the AC/DC hybrid system is complex and the samples are unbalanced. And the current data-mining based transient stability assessment (TSA) method only cares about the identification accuracy of unstable samples
but ignores the difficulty of the sample classification in overlapping areas
resulting in the lack of substantial improvement in comprehensive performance. To solve this problem
a TSA method considering the sample imbalance and overlap is proposed. The proposed method modifies the light gradient boosting machine (LightGBM) by the focal loss function
and automatically assigns different weights to the samples according to their classification and whether they are in the ‘gray zone’ of the overlapping area. Thus the gradient descent direction is optimized. This method not only improves the identification accuracy of unstable samples
but also reduces the misjudgment of stable samples. Cases of the modified IEEE 68-bus system and a certain provincial power grid of China show that the proposed method has good assessment performance on noisy and unbalanced datasets.
XUE Yusheng , LAI Yening . Integration of macro energy thinking and big data thinking: Part one big data and power big data [J]. Automation of Electric Power Systems , 2016 , 40 ( 1 ): 1 - 8 .
XUE Yusheng , LAI Yening . Integration of macro energy thinking and big data thinking: Part two applications and explorations [J]. Automation of Electric Power Systems , 2016 , 40 ( 8 ): 1 - 13 .
WANG Yongping , ZHAO Wenqiang , YANG Jianming , et al . Hybrid high-voltage direct current transmission technology and its development analysis [J]. Automation of Electric Power Systems , 2017 , 41 ( 7 ): 156 - 167 .
VAN DER MEER A A , GIBESCU M , VAN DER MEIJDEN M A M M , et al . Advanced hybrid transient stability and EMT simulation for VSC-HVDC systems [J]. IEEE Transactions on Power Delivery , 2015 , 30 ( 3 ): 1057 - 1066 .
FU Qiang , DU Wenjuan , WANG Haifeng . Small signal stability analysis of AC/DC hybrid power system: an overview [J]. Proceedings of the CSEE , 2018 , 38 ( 10 ): 2829 - 2840 .
GUAN Lin , CAO Shaojie . Combination of heuristic reasoning and ANN to realize on-line transient stability assessment in large scale power systems [J]. Automation of Electric Power Systems , 2000 , 24 ( 2 ): 22 - 26 .
LI Changgang , LI Huarui , LIU Yutian , et al . Intelligent assessment system for dynamic security risk of large-scale power grid [J]. Automation of Electric Power Systems , 2019 , 43 ( 22 ): 67 - 75 .
ZHOU Ting , YANG Jun , ZHOU Qiangming , et al . Power system transient stability assessment method based on modified LightGBM [J]. Power System Technology , 2019 , 43 ( 6 ): 1931 - 1940 .
BAO Yanhong , FENG Changyou , REN Xiancheng , et al . Online transient stability fault screening based on support vector machine [J]. Automation of Electric Power Systems , 2019 , 43 ( 22 ): 52 - 58 .
DAI Yuanhang , CHEN Lei , ZHANG Weiling , et al . Power system transient stability assessment based on multi-support vector machines [J]. Proceedings of the CSEE , 2016 , 36 ( 5 ): 1173 - 1180 .
KE G , MENG Q , FINLEY T , et al . LightGBM: a highly efficient gradient boosting decision tree [C]// Advances in Neural Information Processing Systems , December 4 - 9 , 2017 , Long Beach, USA: 1 - 9 .
LIN T Y , GOYAL P , GIRSHICK R , et al . Focal loss for dense object detection [EB/OL]. [ 2020-01-01 ]. https://arxiv.org/abs/1708.02002 https://arxiv.org/abs/1708.02002 .
ZHU Qiaomu , DANG Jie , CHEN Jinfu , et al . A method for power system transient stability assessment based on deep belief networks [J]. Proceedings of the CSEE , 2018 , 38 ( 3 ): 735 - 743 .
YAO Dequan , JIA Hongjie , ZHAO Shuai . Power system transient stability assessment and stability margin prediction based on compound neural network [J]. Automation of Electric Power Systems , 2013 , 37 ( 20 ): 41 - 46 .
SHAHRIARI B , SWERSKY K , WANG Z , et al . Taking the human out of the loop: a review of Bayesian optimization [J]. Proceedings of the IEEE , 2016 , 104 ( 1 ): 148 - 175 .
CHEN Houhe , WANG Changjiang , JIANG Tao , et al . Transient stability assessment in hybrid AC/DC systems with VSC-HVDC via port energy [J]. Transactions of China Electrotechnical Society , 2018 , 33 ( 3 ): 498 - 511 .
GUPTA A , GURRALA G , SASTRY P S . An online power system stability monitoring system using convolutional neural networks [J]. IEEE Transactions on Power Systems , 2019 , 34 ( 2 ): 864 - 872 .