학술논문
交直流混联系统暂态功角稳定评估及特征量可解释性分析 / Transient Power Angle Stability Evaluation and Interpretability Analysis of AC/DC Hybrid Power System
Document Type
Academic Journal
Source
电力建设 / Electric Power Construction. 45(2):1-9
Subject
Language
Chinese
ISSN
1000-7229
Abstract
相较传统电力系统,含新能源的交直流混联系统结构更加复杂,其稳定评估难度更大,且稳定影响因素的甄别和解释性较差.针对上述问题,首先选择新能源和直流特征量作为稳定评估模型的输入,并由sigmoid函数得到样本预测值与稳定结果之间的关系,提出一种基于极致梯度提升树(extreme gradient Boosting,XGBoost)的交直流混联系统暂态功角稳定评估方法;为进一步分析特征量对系统暂态功角稳定的影响,提出基于SHAP(Shapley additive explanations)的特征量可解释分析方法,从全局说明新能源和直流特征量的重要性,并从全部样本的角度反映各特征量值本身的大小与稳定结果的促进和抑制关系,再从局部得到特征量对单个样本稳定结果的影响;最后在某500 kV实际交直流混联系统上进行仿真验证,证实了该评估方法的准确率较高且SHAP能有效解释新能源和直流特征量对交直流混联系统暂态功角稳定的影响.
Compared with traditional power systems,the structure of an AC/DC hybrid system with new energy sources is more complex,its stability evaluation is more difficult,and the identification and interpretation of stability influencing factors are poor.Given the above problems,this study first selects new energy and DC features as the input of the stability evaluation model and obtains the relationship between the sample prediction value and the stability result using the sigmoid function.A transient power-angle stability evaluation method for an AC/DC hybrid system based on extreme gradient Boosting(XGBoost)was proposed.To further analyze the influence of features on the transient power angle stability of the system,an interpretable analysis method of features based on SHAP is proposed,which explains the importance of new energy and DC features from a global perspective,which reflects the relationship between the size of each feature itself and the promotion and inhibition of stability results from the perspective of all samples,and then obtains the influence of features on the stability results of a single sample from a local perspective.Finally,simulation verification was performed on a 500 kV actual AC/DC hybrid system,which proves that the accuracy of the evaluation method is high and that SHAP can effectively explain the influence of new energy and DC features on the transient power angle stability of the AC/DC hybrid system.
Compared with traditional power systems,the structure of an AC/DC hybrid system with new energy sources is more complex,its stability evaluation is more difficult,and the identification and interpretation of stability influencing factors are poor.Given the above problems,this study first selects new energy and DC features as the input of the stability evaluation model and obtains the relationship between the sample prediction value and the stability result using the sigmoid function.A transient power-angle stability evaluation method for an AC/DC hybrid system based on extreme gradient Boosting(XGBoost)was proposed.To further analyze the influence of features on the transient power angle stability of the system,an interpretable analysis method of features based on SHAP is proposed,which explains the importance of new energy and DC features from a global perspective,which reflects the relationship between the size of each feature itself and the promotion and inhibition of stability results from the perspective of all samples,and then obtains the influence of features on the stability results of a single sample from a local perspective.Finally,simulation verification was performed on a 500 kV actual AC/DC hybrid system,which proves that the accuracy of the evaluation method is high and that SHAP can effectively explain the influence of new energy and DC features on the transient power angle stability of the AC/DC hybrid system.