Physics-Informed Fast Transient Stability Assessment of Non-Fixed Length in Power Systems

doi:10.16183/j.cnki.jsjtu.2023.452

Abstract

Abstract:

Against the backdrop of “dual carbon” goals, the construction of a new power system with new energy as the main component is the main direction and key way for the transformation and upgrading of the power industry. Research into fast and accurate evaluation of transient power angle stability in the context of new power systems is of great significance. To address this, a new transient power angle stability evaluation method is proposed for power systems with grid-forming new energy based on the physics-informed sequence-to-sequence (PI-seq2seq) neural networks and cascaded convolutional neural networks models. First, the PI-seq2seq network structure is used to predict the future power angle trajectory, and a loss function with physical loss terms is constructed to guide the model training process, which avoids the long-duration time-domain simulation to ensure fast transient evaluation. Then, predicted power angle trajectory is taken as input by the cascade convolutional neural networks to evaluate the transient stability and its confidence level. A threshold judgment mechanism for the evaluation confidence level is configured to realize the transient stability judgment of the non-fixed evaluation length, which overcomes the impact of the fixed power angle curve length on the evaluation results. Finally, the method proposed is verified in the Kundur system, and the simulation results show that it has obtained satisfactory results in both the power angle curve prediction and the stability evaluation.

Key words: grid-forming new energy, physics-informed sequence-to-sequence (PI-seq2seq) neural networks, power angle trajectory prediction, cascade convolutional neural networks, transient power angle stability assessment

CLC Number:

TM712
TP183

LI Xiang, CHEN Siyuan, ZHANG Jun, KE Deping, GAO Jiemai, YANG Huanhuan. Physics-Informed Fast Transient Stability Assessment of Non-Fixed Length in Power Systems[J]. Journal of Shanghai Jiao Tong University, 2025, 59(7): 962-970.

Figures/Tables 9

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参数	含义	取值
Input_len	输入长度	5步长
Output_len	预测长度	20步长
Input_dim	输入特征数量	20
Output_dim	输出特征数量	2
Learning_rate	学习率	3×10^-4(预训练)/ 1×10^-4(微调)
Hidden_size	隐藏层大小	128
Epoch	训练轮次	80
Batch_size	训练批次大小	64
Optimizer	优化器	Adam
Loss function	损失函数	RMSE

模型序号	模型	平均绝对误差	均方误差	平均相对误差/%
1	seq2seq	5.531×10^-3	8.412×10^-5	0.7226
2	PI-seq2seq(Euler)	5.199×10^-3	8.975×10^-5	0.4820
3	PI-seq2seq(RK4)	4.359×10^-3	7.117×10^-5	0.4189

计算长度	Andes时域仿真平均耗时/s	PI-seq2seq(RK4) 平均耗时/s
0.3 s功角曲线	0.3480	0.0199
0.5 s功角曲线	0.5300	0.0215

参数	含义	取值
Kernal size	卷积核大小	3×3
Learning_rate	学习率	3×10^-4
Epoch	训练轮次	100
Batch_size	训练批次大小	64
Optimizer	优化器	Adam
Loss function	损失函数	交叉熵损失

层级	准确率	查准率	查全率	F₁
CNN1	97.28	90.74	95.14	92.89
CNN2	98.73	95.23	97.09	96.15
CNN3	99.27	98.05	98.05	98.05