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现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林省吉林市 132012
张亮(1998—),男,硕士研究生,主要研究方向:电力系统稳定和控制。E-mail:longdongzhifeng@163.com
安军(1978—),男,通信作者,博士,教授,博士生导师,主要研究方向:电力系统动态分析和控制。E-mail:anhuianjun@163.com
周毅博(1988—),男,博士研究生,主要研究方向:电力系统稳定和控制。E-mail:zhouyiboaa@126.com
收稿:2022-01-06,
修回:2022-05-29,
网络出版:2022-12-06,
纸质出版:2023-04-10
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张亮,安军,周毅博.基于时间卷积和图注意力网络的电力系统暂态稳定评估[J].电力系统自动化,2023,47(7):114-122.
ZHANG Liang,AN Jun,ZHOU Yibo.Transient Stability Assessment of Power System Based on Temporal Convolution and Graph Attention Network[J].Automation of Electric Power Systems,2023,47(7):114-122.
张亮,安军,周毅博.基于时间卷积和图注意力网络的电力系统暂态稳定评估[J].电力系统自动化,2023,47(7):114-122. DOI: 10.7500/AEPS20220106003.
ZHANG Liang,AN Jun,ZHOU Yibo.Transient Stability Assessment of Power System Based on Temporal Convolution and Graph Attention Network[J].Automation of Electric Power Systems,2023,47(7):114-122. DOI: 10.7500/AEPS20220106003.
准确、快速的暂态稳定评估对电网安全运行至关重要。但现有方法未充分挖掘电网暂态数据的时空特性信息,限制了模型的评估性能。文中提出了一种基于时间卷积网络(TCN)和图注意力网络(GAT)的暂态稳定评估方法。该方法仅以量测母线电压幅值和相角数据作为输入,凭借GAT可以处理图数据并建立电网拓扑连接关系的优点和TCN特有的因果空洞卷积运算特性,自动从暂态数据中提取出空间特征和时间特征,进而实现对系统暂态稳定性的准确评估。此外,采用改进的焦点损失函数作为模型训练目标,可以动态适应训练过程中模型对难易样本的判别界限且自适应处理样本不均衡问题,减少了对失稳样本错分类的现象,同时还提高了全局准确率。IEEE 39和IEEE 145节点系统仿真结果表明,所提方法在响应时间上具有优越性,并且在拓扑变化和数据存在噪声情况下都具有较强的泛化性和鲁棒性,满足在线评估的准确性与快速性要求。
Accurate and fast transient stability assessment is very important for the safe operation of the power system. However
the existing methods do not fully exploit the spatial-temporal characteristics of the power grid transient data
which limits the assessment performance of the models. This paper proposes a transient stability assessment method based on a temporal convolution network (TCN) and graph attention network (GAT). This method only takes the measured bus voltage amplitude and phase-angle data as the input. With the advantage that GAT can process the diagram data and establish the power grid topology connection relationship and the unique causal null convolution operation characteristics of TCN
the spatial and temporal characteristics are automatically extracted to realize the accurate assessment of transient stability. In addition
the improved focus loss function is used as the model training target
which can dynamically adapt to the discriminant boundary of the difficult and easy samples in the training process and adaptively deal with the problem of sample imbalance
thus reducing the phenomenon of misclassification of unstable samples and improving the global accuracy. The simulation results of the IEEE 39-bus system and IEEE 145-bus system show that the proposed method is superior in response time
has strong generalization and robustness in the case of topological structure changes and data noise
and meets the accuracy and rapidity requirements of online transient stability assessment.
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