cydets 1.1

Cycle Detection in Time Series (CyDeTS). An algorithm to detect cycles in times series along with their respective depth of cycle and duration.

This package implements an algorithm to detect cycles in a times series along with their respective depth-of-cycle (DoC) and duration. It is maintained as a standalone package within the Open Energy Modelling Framework. The acronym CyDeTS stands for (Cy)cle (De)tection in (T)ime (S)eries and is chosen to prevent confusions with cycle definitions from graph theory.

Algorithmic results have been tested against the well known rainflow cycle counting (RFC) method from mechanical engineering and the equivalence of both counting methods has been proved. The original algorithm has been developed and proposed within the following publication:

Dambrowski, Jonny; Pichlmaier, Simon & Jossen, Andreas. Mathematical methods for classification of state-of-charge time series for cycle lifetime prediction. Advanced Automotive Battery Conference. Mainz, Germany. 2012.

Thanks again to Simon Pichlmaier for sharing his code and allowing us to port and publish the algorithm under a free license.

Documentation

The probably most extensive description of the algorithm can be found in the abovementioned paper. In addition, we have tried to document the single parts of the algorithm as docstrings within the code.

Installation

If you have a working Python3 environment, use can pypi to install the latest version.

pip install cydets

Usage

The algorithm is implemented as a function which takes an array-like data structure as argument. Results are returned as a pandas dataframe.

import pandas as pd
from cydets.algorithm import detect_cycles

# create sample data
series = pd.Series([0, 1, 0, 0.5, 0, 1, 0, 0.5, 0, 1, 0])

# detect cycles
cycles = detect_cycles(series)

Citation

Please use our entry on Zenodo to refer a specific version

License

Copyright (C) 2019 oemof developing group

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.