{"title":"Optimization-Based Data Recovery After False Data Injection Attacks on State Estimators Using Measurements Inertia and Calibrated Predictions","authors":"Elham Ommani;Hamed Delkhosh;Hossein Seifi","doi":"10.1109/TSG.2025.3649519","DOIUrl":"10.1109/TSG.2025.3649519","url":null,"abstract":"Information and communication technology brings better operation capabilities for the power grids at the cost of vulnerability against cyber-attacks. The false data injection attack (FDIA) on the state estimator (SE) is one of the intelligent cyber threats, for which different detection and mitigation methods are proposed. Nevertheless, data recovery after the FDIAs as one of the mitigative actions has received less attention in the literature. This paper proposes a data recovery scheme based on optimization to maintain the consistency among recovered variables. Also, the attack region is localized in an enhanced way so that the non-attacked variables will be preserved as much as possible. The optimization combines two important sources of information for accurate data recovery, i.e., measurement data inertia (MDI) and prediction data calibration (PDC). MDI and PDC are formed using machine learning methods (respectively regression and XGBoost) based on online training using recent (e.g., two weeks) power grid data. Such training is demonstrated to be fast enough (less than the data acquisition rate) to provide adaptable accurate data recovery considering different conditions. Extensive experiments are implemented on the IEEE 118-bus test system to verify the correctness and effectiveness of the proposed method.","PeriodicalId":13331,"journal":{"name":"IEEE Transactions on Smart Grid","volume":"17 3","pages":"2438-2448"},"PeriodicalIF":9.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145893869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Clean-ET: A Novel Electricity Theft Method Based on Clean Backdoor Attack","authors":"Yingzhi Zhang;Feng Wu;Shouyue Sun;Lei Cui;Longxiang Gao;Shui Yu","doi":"10.1109/TSG.2025.3649821","DOIUrl":"10.1109/TSG.2025.3649821","url":null,"abstract":"As an efficient energy management system, the smart grid has been widely adopted in areas such as power system dispatch optimization and energy internet development. However, false data injection attacks (FDIA) represent a major security challenge for electricity theft detection (ETD) models by manipulating data to mislead system decisions. Existing FDIA methods lack transferability, so the attack becomes ineffective once the defender changes the ETD model. Moreover, FDIA methods significantly degrade the classification performance of ETD models, increasing the risk of exposure and reducing stealth, complicating the demonstration of the potential threat of electricity theft (ET). In this paper, we propose a Novel Electricity Theft Method Based on Clean Backdoor Attack (Clean-ET) to highlight potential threats further. Clean-ET leverages inherent statistical differences in electricity consumption patterns and temporal periodic characteristics to stealthily embed a backdoor into the ETD model, facilitating covert electricity theft with strong cross-model transferability. Specifically, Clean-ET leverages the statistical differences in electricity usage between normal users and electricity thieves by incorporating Gaussian noise and temporal periodic cycle patterns. Moreover, we design triggers that seamlessly blend into the natural distribution of electricity data. This allows the backdoored ETD model to maintain high classification accuracy under normal conditions while misclassifying electricity theft cases under trigger conditions, enabling a long-term stealthy attack. Consequently, regardless of the specific ETD model used by the defender, our attack remains effective as long as the trigger samples are included in the ETD model training, highlighting the transferability of our attack. Experimental results demonstrate that under various parameter settings, our method attains an attack success rate (ASR) consistently above 80%, reaching up to 94%, while minimally impacting the classification performance of clean samples.","PeriodicalId":13331,"journal":{"name":"IEEE Transactions on Smart Grid","volume":"17 3","pages":"2449-2462"},"PeriodicalIF":9.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145893860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Neural Network-Based Adaptive LFC Approach for Multi-Area Power Systems Vulnerable to Hybrid Attacks","authors":"Xin Wang;Ju H. Park;Jiangfeng Wang;Dan Zhang","doi":"10.1109/TSG.2026.3653032","DOIUrl":"10.1109/TSG.2026.3653032","url":null,"abstract":"Due to the open communication architecture and the ever-expanding network connections of modern power systems, cybersecurity has become increasingly important. For this reason, this paper tackles the load frequency control (LFC) problem in multi-area power systems (MAPSs) that are vulnerable to both time-constrained denial-of-service (DoS) attacks and unknown false-data-injection (FDI) attacks. First, unlike existing research that relies on randomly generated DoS attacks, this paper proposes a detection algorithm aimed at identifying DoS attacks based on network traffic analysis. Moreover, to address unknown FDI attack, we employ neural networks (NNs) to learn the characteristics of the attack signals and construct an approximation model. Then, an NN-based attack compensation controller is developed to mitigate or eliminate the negative impact of unknown maliciously FDI information on system performance. By carefully constructing Lyapunov functional, the exponential asymptotically stability condition with an <inline-formula> <tex-math>${mathcal {H}}_{infty }$ </tex-math></inline-formula> performance index is derived under hybrid attacks. We also determined the relationship between the performance index of the compromised LFC system and the minimum allowable sleep time and maximum allowable active time under DoS attacks. Finally, a simulation example is illustrated to substantiate the validity of the proposed approach.","PeriodicalId":13331,"journal":{"name":"IEEE Transactions on Smart Grid","volume":"17 3","pages":"2480-2489"},"PeriodicalIF":9.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145955407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Qian Wan;Yan-Wu Wang;Xiao-Kang Liu;Andrew D. Syrmakesis;Nikos D. Hatziargyriou
{"title":"Dynamic Self-Triggered Load Frequency Control for Multi-Area Power Systems Under Non-Ideal Communication Environments","authors":"Qian Wan;Yan-Wu Wang;Xiao-Kang Liu;Andrew D. Syrmakesis;Nikos D. Hatziargyriou","doi":"10.1109/TSG.2025.3649018","DOIUrl":"10.1109/TSG.2025.3649018","url":null,"abstract":"Multi-area power systems (MAPSs) consist of multiple area subsystems, exchanging power between each area to maintain a balance of supply and demand. With the introduction of communication facilities, traditional load frequency control (LFC) methods and event-triggered communication mechanisms may not be effective due to network-induced delays and external attacks caused by non-ideal environments. In this paper, a decentralized LFC algorithm with a novel dynamic self-triggered mechanism (DSTM) for MAPSs under non-ideal communication environments is proposed to ensure secure operation. The proposed DSTM employs a dynamic threshold, a rest time interval and an internal dynamic variable, which can extend triggering intervals and effectively avoid Zeno behavior. An <inline-formula> <tex-math>$H_{infty }$ </tex-math></inline-formula> stability criterion and a co-design criterion are derived by a switching-based Lyapunov-Krasovskii functional. Comparison simulations and hardware-in-the-loop experiments verify the superiority and effectiveness of the proposed scheme.","PeriodicalId":13331,"journal":{"name":"IEEE Transactions on Smart Grid","volume":"17 3","pages":"2425-2437"},"PeriodicalIF":9.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145955412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Risk-Aware Prediction-Optimization Integrated Method for Day-Ahead Microgrid Operation","authors":"Hongzhang Sheng;Yan Xu;Dunjian Xie","doi":"10.1109/TSG.2026.3671086","DOIUrl":"10.1109/TSG.2026.3671086","url":null,"abstract":"This letter proposes a risk-aware prediction-optimization integrated method for day-ahead operation of a microgrid under uncertain electricity prices. The operation problem is formulated in a bilevel structure: the lower-level optimization model determines the dispatch decisions, while the upper-level prediction model minimizes the decision loss induced by price forecast errors. A training loss function is developed to explicitly capture prediction-induced economic risks, which first approximates the decision loss via a convex and differentiable surrogate, and then reweights training samples using a spectral risk measure. By training the prediction model to minimize the risk-weighted loss, both prediction and optimization objectives can be aligned in an end-to-end pattern, thereby achieving risk-aware microgrid operation. Case studies on a real-world dataset demonstrate the effectiveness of the proposed method.","PeriodicalId":13331,"journal":{"name":"IEEE Transactions on Smart Grid","volume":"17 3","pages":"2626-2628"},"PeriodicalIF":9.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147371368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"LLM and Bayesian Network Integrated Simulation Framework for Electric Vehicle User Charging Behaviorals","authors":"Yi Xiong;Jiamin Ge;Liang Che","doi":"10.1109/TSG.2026.3654823","DOIUrl":"10.1109/TSG.2026.3654823","url":null,"abstract":"Electric vehicle (EV) users’ behaviors are influenced by users’ willingness, which is not directly observable. Emerging large language models (LLMs) have advantages in handling this problem. However, existing studies usually use LLM to directly output EV users’ behaviors, which is limited by the LLM’s inherent issues: “randomness” and “hallucination”. To address these issues, this study proposes an LLM-Bayesian network (BN) integrated simulation framework. First, LLM is used to extract and label EV users’ willingness. Second, LLM generates an explicit causal structure and prior probability, which constructs a BN. Finally, Bayesian inference updates the BN’s prior probability. The BN outputs EV users’ charging behaviors. Experimental results show that in few-shot scenarios, LLM-BN achieves a 20.3% to 27.5% improvement in predictive accuracy compared to pure LLM methods. Moreover, LLM-BN addresses “randomness” and “hallucination” issues, and effectively suppresses violations of physical constraints and the generation of fake information. In practical applications, peak shaving and valley filling are achieved through electricity price adjustments, reducing peak demand by 25% and increasing off-peak demand by 30%.","PeriodicalId":13331,"journal":{"name":"IEEE Transactions on Smart Grid","volume":"17 3","pages":"2618-2621"},"PeriodicalIF":9.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145993243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Multivariate Power Load Forecasting Model Considering Meteorological Feature-Load Dynamic Forward Lag and Turning Points","authors":"Yunbo Niu;Pei Yong;Juan Yu;Zhifang Yang","doi":"10.1109/TSG.2025.3642111","DOIUrl":"10.1109/TSG.2025.3642111","url":null,"abstract":"Due to building thermal inertia and delayed user behavioral responses, power load often lags behind meteorological changes, particularly drops in temperature and humidity. Existing models tend to overlook this dynamic lag relationship. To address these challenges, this study proposes a power load forecasting model that integrates three key mechanisms: a dynamic forward lag mechanism, a turning point attention mechanism, and a temporal and channel hybrid mechanism. These components collectively enable the forecasting model to adaptively align meteorological lags, focus on abrupt load transitions, and capture both global temporal dependencies and local feature interactions, thereby enhancing its ability to model complex load behaviors and improve prediction accuracy. Seven experiments were conducted using load data from Singapore and Calgary, Canada, to validate the effectiveness of the proposed model. Numerical results show that the proposed method achieves higher forecasting accuracy compared to existing load forecasting approaches.","PeriodicalId":13331,"journal":{"name":"IEEE Transactions on Smart Grid","volume":"17 3","pages":"2490-2505"},"PeriodicalIF":9.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145717700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Design of Flexible DC-SOP Toward Four-Quadrant Power Flow Control in Bipolar Distribution Networks","authors":"Chengjia Zhang;Xiaodong Yang;Lijian Ding;Yue Yang;Helong Li;Zhiqing Yang;Qiuwei Wu;Jinyu Wen","doi":"10.1109/TSG.2026.3651935","DOIUrl":"10.1109/TSG.2026.3651935","url":null,"abstract":"This letter introduces the direct current soft open point (DC-SOP), which is a bipolar DC-DC converter designed to achieve independent four-quadrant power flow control in bipolar DC distribution networks (BDDNs). For the first time, asymmetric dual active bridges are employed to connect the four-quadrant ports, ensuring a flexible power channel to realize bidirectional power transfer between branches and poles. Bidirectional phase-shift modulation strategy and four-quadrant decoupling facilitate independent power control, effectively mitigating branch overload and inter-pole power unbalance. To improve model linearization accuracy, a refined relaxation method is proposed, providing theoretical guidance for DC-SOP applications in BDDNs. The effectiveness of the proposed method is validated in ±10kV BDDNs with 33 nodes and 123 nodes.","PeriodicalId":13331,"journal":{"name":"IEEE Transactions on Smart Grid","volume":"17 3","pages":"2614-2617"},"PeriodicalIF":9.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145955409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elio El Semaan;Alessio Iovine;Trung Dung Le;Philippe Dessante;Mouna Rifi;Dominique Croteau
{"title":"A Physics-Informed-Neural-Network-Based State Estimator for Low Voltage Distribution Systems","authors":"Elio El Semaan;Alessio Iovine;Trung Dung Le;Philippe Dessante;Mouna Rifi;Dominique Croteau","doi":"10.1109/TSG.2025.3648864","DOIUrl":"10.1109/TSG.2025.3648864","url":null,"abstract":"Due to the rising penetration of distributed energy resources and electric vehicles charging stations, Distribution System Operators (DSOs) are facing higher challenges to effectively manage low voltage (LV) grids. To enhance their voltage magnitudes’ real-time monitoring, distribution system state estimators (DSSEs) are the targeted solution. However, the application of conventional techniques for state estimation to LV grids is challenged by their unbalanced nature and the limited access to real-time measurements, while on the other hand state estimators (SEs) based on classical machine learning techniques are limited by a lack of knowledge of the physical aspect of the electrical systems. To address these issues, this paper proposes a physics-informed neural network (PINN) based LV DSSE using Graph Neural Networks (GNN). The proposed SE incorporates information about the grid’s topology and parameters while proposing a three-phase four-wire graph representation suitable for LV grids characteristics. Moreover, an unsupervised training is proposed with the aim of training the model in respect to the physical equations, among which the power flow equations. Tests are conducted on various grids generated from open data and evaluate the performance of the GNN-based SE while comparing it to classical machine learning based techniques as autoencoders (AE). The generalizability of the proposed SE in terms of training on a subset of grids and applying to others is investigated.","PeriodicalId":13331,"journal":{"name":"IEEE Transactions on Smart Grid","volume":"17 3","pages":"2544-2554"},"PeriodicalIF":9.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145844682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}