5 research outputs found
AI Modelling and Time-series Forecasting Systems for Trading Energy Flexibility in Distribution Grids
We demonstrate progress on the deployment of two sets of technologies to
support distribution grid operators integrating high shares of renewable energy
sources, based on a market for trading local energy flexibilities. An
artificial-intelligence (AI) grid modelling tool, based on probabilistic
graphs, predicts congestions and estimates the amount and location of energy
flexibility required to avoid such events. A scalable time-series forecasting
system delivers large numbers of short-term predictions of distributed energy
demand and generation. We discuss the deployment of the technologies at three
trial demonstration sites across Europe, in the context of a research project
carried out in a consortium with energy utilities, technology providers and
research institutions
Probabilistic Graphs for Sensor Data-driven Modelling of Power Systems at Scale
The growing complexity of the power grid, driven by increasing share of
distributed energy resources and by massive deployment of intelligent
internet-connected devices, requires new modelling tools for planning and
operation. Physics-based state estimation models currently used for data
filtering, prediction and anomaly detection are hard to maintain and adapt to
the ever-changing complex dynamics of the power system. A data-driven approach
based on probabilistic graphs is proposed, where custom non-linear, localised
models of the joint density of subset of system variables can be combined to
model arbitrarily large and complex systems. The graphical model allows to
naturally embed domain knowledge in the form of variables dependency structure
or local quantitative relationships. A specific instance where neural-network
models are used to represent the local joint densities is proposed, although
the methodology generalises to other model classes. Accuracy and scalability
are evaluated on a large-scale data set representative of the European
transmission grid
Open Power System Data - Frictionless data for electricity system modelling
The quality of electricity system modelling heavily depends on the input data
used. Although a lot of data is publicly available, it is often dispersed,
tedious to process and partly contains errors. We argue that a central
provision of input data for modelling has the character of a public good: it
reduces overall societal costs for quantitative energy research as redundant
work is avoided, and it improves transparency and reproducibility in
electricity system modelling. This paper describes the Open Power System Data
platform that aims at realising the efficiency and quality gains of centralised
data provision by collecting, checking, processing, aggregating, documenting
and publishing data required by most modellers. We conclude that the platform
can provide substantial benefits to energy system analysis by raising
efficiency of data pre-processing, providing a method for making data
pre-processing for energy system modelling traceable, flexible and reproducible
and improving the quality of original data published by data providers.Comment: This is the postprint version of the articl
Multi-Source Data Fusion for Cyberattack Detection in Power Systems
Cyberattacks can cause a severe impact on power systems unless detected
early. However, accurate and timely detection in critical infrastructure
systems presents challenges, e.g., due to zero-day vulnerability exploitations
and the cyber-physical nature of the system coupled with the need for high
reliability and resilience of the physical system. Conventional rule-based and
anomaly-based intrusion detection system (IDS) tools are insufficient for
detecting zero-day cyber intrusions in the industrial control system (ICS)
networks. Hence, in this work, we show that fusing information from multiple
data sources can help identify cyber-induced incidents and reduce false
positives. Specifically, we present how to recognize and address the barriers
that can prevent the accurate use of multiple data sources for fusion-based
detection. We perform multi-source data fusion for training IDS in a
cyber-physical power system testbed where we collect cyber and physical side
data from multiple sensors emulating real-world data sources that would be
found in a utility and synthesizes these into features for algorithms to detect
intrusions. Results are presented using the proposed data fusion application to
infer False Data and Command injection-based Man-in- The-Middle (MiTM) attacks.
Post collection, the data fusion application uses time-synchronized merge and
extracts features followed by pre-processing such as imputation and encoding
before training supervised, semi-supervised, and unsupervised learning models
to evaluate the performance of the IDS. A major finding is the improvement of
detection accuracy by fusion of features from cyber, security, and physical
domains. Additionally, we observed the co-training technique performs at par
with supervised learning methods when fed with our features