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1.浙江大学电气工程学院,浙江省杭州市 310027
2.国网浙江省电力有限公司电力科学研究院,浙江省杭州市 310011
3.国网浙江省电力有限公司,浙江省杭州市 310007
Received:23 March 2025,
Revised:2025-05-12,
Online First:04 August 2025,
Published:10 November 2025
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彭里卓,林达,汪湘晋等.计及因果关系增强的锂离子电池健康状态估计方法[J].电力系统自动化,2025,49(21):108-119.
PENG Lizhuo,LIN Da,WANG Xiangjin,et al.State of Health Estimation Method for Lithium-ion Batteries Considering Causality Enhancement[J].Automation of Electric Power Systems,2025,49(21):108-119.
彭里卓,林达,汪湘晋等.计及因果关系增强的锂离子电池健康状态估计方法[J].电力系统自动化,2025,49(21):108-119. DOI: 10.7500/AEPS20250323006.
PENG Lizhuo,LIN Da,WANG Xiangjin,et al.State of Health Estimation Method for Lithium-ion Batteries Considering Causality Enhancement[J].Automation of Electric Power Systems,2025,49(21):108-119. DOI: 10.7500/AEPS20250323006.
随着新型电力系统的快速发展,锂离子电池等储能技术在高渗透率可再生能源接入中发挥重要作用,快速准确地进行锂离子电池健康状态(SOH)估计有助于提升储能系统的安全性和可靠性。然而,基于相关性分析的传统数据驱动方法存在可解释性不足问题,且难以保障训练样本之外电池SOH估计的准确性和泛化性。为此,提出了一种计及因果关系增强和基于双向门控循环单元网络的锂离子电池SOH估计方法。首先,建立了基于因果-观测融合推演的锂离子电池因果关系增强模型,从电池量测数据构建多时序非线性因果增强特征以提升SOH估计的可解释性和分布内泛化性。接着,计及电池多时序非线性因果增强特征,提出了基于双向门控循环单元网络和不变风险最小化理论的锂离子电池SOH估计方法,以提升SOH估计的准确性和分布外泛化性。最后,以多种锂离子电池实际运行工况数据为例对所提方法进行验证。算例分析结果表明,所提锂离子电池SOH估计方法具有较好的可解释性、准确性和泛化性。
With the rapid development of new power system
energy storage technologies such as lithium-ion battery play a crucial role in integrating renewable energy sources with high penetration rates. Rapid and accurate state of health (SOH) estimation of lithium-ion battery helps enhance the safety and reliability of energy storage systems. However
traditional data-driven methods based on correlation analysis suffer from insufficient interpretability and struggle to ensure the accuracy and generalization of battery SOH estimation beyond the training samples. To address this issue
a SOH estimation method for lithium-ion batteries considering causality enhancement and based on bidirectional gated recurrent unit (BiGRU) network is proposed. First
a causality enhancement model for lithium-ion batteries based on causal-observation fusion inference is established. This model constructs multi-temporal nonlinear causality-enhanced features from batteries measurement data to improve the interpretability and in-distribution generalization of SOH estimation. Then
considering the multi-temporal nonlinear causality-enhanced features of the battery
the SOH estimation method for lithium-ion battery based on BiGRU network and invariant risk minimization theory is proposed to enhance the accuracy and out-distribution generalization of SOH estimation. Finally
the proposed method is validated using various actual operational condition data of lithium-ion batteries. Case study results demonstrate that the proposed SOH estimation method for lithium-ion batteries has good interpretability
accuracy
and generalization.
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