Compress Time Series by Type Days
The method compresses a time series (or several time series with the same time points) to a certain number of type days (typedays). Type days represent typical days. They are sample days calculated on the basis of a typical load curve. For example, it could be a typical weekday and a typical weekend day.
The type-day-compressed time series is always an abstract time series.
Only time series
can be type-day-compressed.
Process of Type Day Compression
Days occurring in the original time series with a similar load profile are combined into clusters as in automatic time series compression. The special feature of type day compression is that the elements to be compressed, and thus also the centers of the clusters, are not individual points in time but days.
The number of days combined in a cluster determines the proportion of the type day in the total period under consideration, usually one year.
The resolution of a type day is determined by the number of time steps per type day.
The following figure illustrates the process of type day compression schematically.
The desired number of clusters can be specified.
The maxima and/or minima of the time series can optionally be added separately.
Applying the Method
To compress the data values of a time series, use the menu items Methods → Convert time series → Typeday-compress time series (see following figure).
In the window that opens (see following figure), use Select time series to select the time series to be compressed. A multiple selection is possible.
If several time series are to be compressed at once, they must have the same data points. If this is not the case, a window for error handling will open as with automatic time series compression.
Specify the Number of clusters. Integer values between 2 and the number of data points of the time series to be compressed are possible.
Decide whether to Add maxima and minima and Use existing values as centers.
Finally, you select whether the respective existing time series is to be overwritten with the new values or whether a new time series should be created.
Example
The following figure shows the original time series Power Demand and the result of the type day compression to two clusters by adding the minima and maxima.
Type Day Compression in TOP-Energy
In the case of structural optimization with a non-seasonal storage that does not necessarily have to be structurally optimized itself, type day compression is automatically performed depending on the compression level selected.
The number and resolution of type days depend on the Compression level selected in the Simulation ribbon in TOP-Energy. They are displayed in the message 8385 of the Simulator, such as
The time series have been compressed for structural optimization to 4 type days with 2 time steps each.
