Manage Load Situations

Load Situations are static load distributions that are created from underlying time series data of active and reactive power imported from .Sim, .Mon or from Reference Profiles.

As such, the created load situation is based on actual measured data from smart meters or user-defined profiles, as opposed to any other static load distribution created by the user.

The load situation can be selected in the Grid Upgrades, Connection Request and Scenarios dropdown list of all Static Calculation pages.

Grid

Load Situations are created on a per-grid basis. Choose the grid for which the load situation shall be created from the Grid dropdown list.

INFO

Load Situations can only be created if there is underlying time series data available for that grid.

WARNING

If no time series data is available, the following warning will be shown upon creation of the load situation:

The grid does not contain any measurements. Please run Sim or Mon.

Grid Upgrades, Connection Request and Scenarios

Grid Upgrades and Connection Requests are applied to the grid by default depending on their status. They are part of the grid model while creating the load situation and contribute to it if any time series data is tied to them.

Setup

Previously created Load Situations can be selected and changed from the dropdown list.

A new Load Situation can be created by clicking on .

A Load Situation can be deleted by selecting it from the dropdown list, clicking on and then .

the Load Situation once finished.

Name

Every newly created Load Situation requires a Name so that it can be uniquely identified later.

Load Situations Type

This setting defines the type of the load situation. Since the underlying data is time-varying, different static load situation types can be created. The following types are available:

• Selected point in time: The load sitution is based on the data from the time series that matches the selected time stamp. The slack bus reference voltage is taken at the selected time stamp.
• Overall maximum residual net load: The load situation matches the point in time when the grid assumes the overall maximum residual load within the selected time interval. The slack bus reference voltage matches the point in time when the grid assumes the maximum residual load.
• Overall minimum residual net load: The load situation matches the point in time when the grid assumes the overall minimum residual load within the selected time interval. The slack bus reference voltage matches the point in time when the grid assumes the minimum residual load.
• Per-bus maximum residual loads: The load situation maximizes the per-bus residual load within the selected time interval. The slack bus reference voltage is set to the minimum of the voltage measurements within the selected time interval.
• Per-bus minimum residual loads: The load situation minimizes the per-bus residual load within the selected time interval. The slack bus reference voltage is set to the maximum of the voltage measurements within the selected time interval.

INFO

Overall residual net load is defined as the instantaneous power that needs to be supplied by the grid feeder after accounting for all power generated within the grid. It is the sum of all loads $P_L$ in the grid minus the sum of all generators $P_G$ in the grid, or $P_{feeder}=P_L-P_G$.

Note that there can only be one point in time where the overall residual net load is maximum or minimum.

Per-bus residual load is defined as the instantaneous power that needs to be supplied by the grid at every individual bus after accounting for the power generated at that bus. It is the sum of the loads at bus $b$, $P_{L,b}$, minus the sum of the generators at bus $b$, $P_{G,b}$, or $P_b=P_{L,b}-P_{G,b}$. The power supplied by the grid feeder then is the sum of the per-bus residual load over all buses $B$, or $P_{feeder}=\sum _{b=1}^B{P}_b$.

Note that the point in time where the per-bus residual load $P_b$ is maximum or minimum can differ from bus to bus.

Existing Load/Generators

A load situation replaces the static load and generation in the grid, this setting defines if all or only a part of the existing loads and generators are replaced.

• Remove all: All loads and generators of the grid are deleted, even if they are not considered in the load situation (e.g. because they don't have a time series behavior). Choose this option if the data from the load situation shall replace all existing static load and generation.
• Remove considered devices only: Only devices that were considered in the creation of the load situation (e.g. because they have a time series behavior) are actually removed by the load sitation. Other devices / connection requests that were not considered in the load situation are not deleted.