Abstract
Energy saving and emission reduction have become common concerns in countries around the world. In China, with the implementation of the new strategy of “carbon peak and neutrality” and the rapid development of the new smart grid infrastructure, the amount of data of actual power grid dispatching and fault analysis show exponential growth, which has led to phenomena such as poor supervision effectiveness and difficulty in handling faults in the process of grid operation and maintenance. Existing research on retrieval recommendation methods has had a lower accuracy rate at cold-start due to a small sample of user interactions. In addition, the cumulative learning of user personalization during general retrieval results in a poor perception of potential interest. By constructing a power knowledge graph, this paper presents a power fault retrieval and recommendation model (PF2RM) based on user-polymorphic perception. This model includes two methods: the power fault retrieval method (PFR) and the user-polymorphic retrieval recommendation method (UPRR). First, we take the power grid fault dispatching business as the core and reconstruct the ontology layer of the power knowledge graph. The PFR method is used to design the graph-neighbor fault entity cluster to enhance the polymerization degree of a fault implementation scenario. This method can solve the search cold-start recommendation problem. At the same time, the UPRR method aims to form user retrieval subgraphs of the past-state and current-state and make a feature matching for the graph-neighbor fault entity cluster, and then realize the accurate prediction of the user’s general search intention. The model is compared with other current classical models through the evaluation of multiple recommendation evaluation metrics, and the experimental results show that the model has a 3–8% improvement in the cold-start recommendation effect and 2–10% improvement in regular retrieval. The model has the best average recommendation performance in multiple metrics and has good results in fault analysis and retrieval recommendation. It plays a helpful role in intelligent operation and maintenance of the power grid and auxiliary decision-making, and effectively improves the reliability of the power grid.
Highlights
To solve the above limitations, we propose a Power Fault Retrieval and Recommendation Model (PF2RM) based on the knowledge graph
We propose the graph-neighbor fault entity cluster to emphasize the correlation between neighboring project entities to solve the problem of search cold starts
We propose a userpolymorphic retrieval recommendation method (UPRR) to predict the retrieval behavior of regular state users and generate user search recommendations for grid operation and fault handling
Summary
As countries around the world gradually focus on energy conservation and green development, China has put forward the environmental protection strategies of “carbon neutrality” and “carbon peaking”. The embedding learning maps users and items to vectorized representations, and interactive modeling is based on vectorized representations to match user–item interaction features [3–5]. This method has limitations because it relies more on historical data viewed by users, so there is a problem of scarcity of data samples in the case of cold-start. Under the trend of systematization and structurization of knowledge, the recommendation method of incorporating a knowledge graph has become a research hotspot [4,6–8]. This new recommendation model improves the above-mentioned limitations to a certain degree
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