SVD-based Visualisation and Approximation for Time Series Data in Smart Energy Systems
This provides a method for researchers and practitioners in smart energy systems to better analyze complex time series data, though it is incremental as it applies existing matrix techniques to a new domain.
The paper tackled the problem of analyzing time series data in smart energy systems with multiple timescales by interpreting them as matrices for visualization and decomposition, demonstrating this approach on German day-ahead market data to spot subtle features and elucidate underlying structures.
Many time series in smart energy systems exhibit two different timescales. On the one hand there are patterns linked to daily human activities. On the other hand, there are relatively slow trends linked to seasonal variations. In this paper we interpret these time series as matrices, to be visualized as images. This approach has two advantages: First of all, interpreting such time series as images enables one to visually integrate across the image and makes it therefore easier to spot subtle or faint features. Second, the matrix interpretation also grants elucidation of the underlying structure using well-established matrix decomposition methods. We will illustrate both these aspects for data obtained from the German day-ahead market.