{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,10]],"date-time":"2026-10-10T05:48:54Z","timestamp":1791611334886,"version":"4.3.4"},"reference-count":160,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2026,8,13]],"date-time":"2026-08-13T00:00:00Z","timestamp":1786579200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100005311","name":"China Southern Power Grid","doi-asserted-by":"crossref","award":["210000KC24060041"],"award-info":[{"award-number":["210000KC24060041"]}],"id":[{"id":"10.13039\/501100005311","id-type":"DOI","asserted-by":"crossref"}]},{"award":["210000KC24060041"],"award-info":[{"award-number":["210000KC24060041"]}],"id":[{"id":"https:\/\/ror.org\/03hkh9419","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Smart meters are the core terminals for distribution network data acquisition in smart cities, yet their collected data commonly suffer from quality issues caused by harsh operating environments, communication failures, hardware degradation, and human factors. This paper presents a systematic review of anomaly detection and data repair methods for smart meter data based on a critical analysis of many publications. First, we characterize five typical anomalies\u2014sudden jumps, reading stagnation, reverse readings, pulse spikes, and gradual drifts\u2014from physical root causes to data manifestations and provide unified mathematical definitions with explicit traceability to the existing literature. Additional anomaly types including meter replacement jumps, data duplication from retransmission, complete missing segments, and timestamp errors are also discussed to present a more complete picture of operational data quality challenges. Second, existing anomaly detection methods are systematically reviewed and classified into four categories\u2014statistical, machine learning, deep learning, and dedicated time-series methods\u2014with representative studies, quantitative performance metrics, and scenario-specific applicability examined for each. Third, data repair approaches are reviewed across four categories\u2014traditional interpolation, matrix completion, generative models, and time-series prediction\u2014with systematic comparison of their accuracy and limitations across different anomaly types and durations. Based on the synthesized evidence, we identify three cross-cutting structural limitations that persist across method categories: the performance ceiling of data-only detection without physical constraint embedding, the open-loop architecture that separates detection from repair and allows error propagation, and the exclusive reliance on statistical error metrics that fails to distinguish physically plausible repairs from those violating conservation laws. To address these gaps, we discuss a physics-guided integrated framework incorporating physical constraint embedding, joint anomaly diagnosis, scenario-adaptive repair, and posterior verification as a promising forward-looking direction. Finally, open challenges and future research directions are outlined, including parameter adaptation in unlabeled scenarios, multi-source data fusion for physical disambiguation, new power system extensions, explainable AI integration, edge-computing deployment, and standardized benchmark development. This review provides a comprehensive theoretical reference and technical roadmap for smart meter data quality research in the context of smart city energy systems.<\/jats:p>","DOI":"10.3390\/s26165122","type":"journal-article","created":{"date-parts":[[2026,8,13]],"date-time":"2026-08-13T08:06:16Z","timestamp":1786608376000},"page":"5122","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Anomaly Detection and Data Repair for Smart Meter Data in Smart Cities: A Comprehensive Review and Future Perspectives"],"prefix":"10.3390","volume":"26","author":[{"given":"Bensong","family":"Zhang","sequence":"first","affiliation":[{"name":"Southern Grid Digital Grid Group Co., Ltd., Guangzhou 510700, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guoying","family":"Lin","sequence":"additional","affiliation":[{"name":"Southern Grid Digital Grid Group Co., Ltd., Guangzhou 510700, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaihong","family":"Zheng","sequence":"additional","affiliation":[{"name":"Southern Grid Digital Grid Group Co., Ltd., Guangzhou 510700, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinyang","family":"Du","sequence":"additional","affiliation":[{"name":"Southern Grid Digital Grid Group Co., Ltd., Guangzhou 510700, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,13]]},"reference":[{"key":"ref_1","first-page":"54","article-title":"Review of intelligent load forecasting algorithms in the context of new power systems","volume":"52","author":"Yang","year":"2025","journal-title":"J. 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