Consider Existing Load and Generation
Standard behavior
This option allows to specify different Power Flow scenarios according to which the relative voltage change at the buses are calculated.
The following two options are available:
- Shift operating point by considering existing loads (option 1)
- Consider existing generators (option 2)
The behaviour for the calculation of the relative voltage change depending on the options is the following:
| No option enabled | Option 1 enabled | Option 2 enabled | Option 1+2 enabled |
|---|---|---|---|
| comparison of the voltages between the cases 'no load, no generation, no request' and 'no load, no generation, with request' | comparison of the voltages between the cases 'full load, no generation, no request' and 'full load, no generation, with request' | comparison of the voltages between the cases 'no load, no generation, no request' and 'no load, full generation, with request' | comparison of the voltages between the cases 'full load, no generation, no request' and 'full load, full generation, with request' |
If you are using the Spanish ruleset, the behaviour for the calculation of the relative voltage change depending on the options is the following:
| No option enabled | Option 1 enabled | Option 2 enabled | Option 1+2 enabled |
|---|---|---|---|
| comparison of the voltages between the cases 'no load, no generation, no request' and 'no load, no generation, with request' | comparison of the voltages between the cases 'full load, no generation, no request' and 'full load, no generation, with request' | comparison of the voltages between the cases 'no load, 90% generation, no request' and 'no load, 90% generation, with request' | comparison of the voltages between the cases 'full load, 90% generation, no request' and 'full load, 90% generation, with request' |
TIP
Option 2 should always be enabled according to DACHCZ norms when evaluating voltage changes.
INFO
Option 1 can be enabled, depending on the grid operator's connection request guidelines
Details
These options are available in Connection Request, DACHCZ and Hosting Capacity pages.
Behavior with Load Situations
When using Load Situations as part of Connection Request, DACHCZ or Hosting Capacity, the options above are ignored.
Instead, the relative voltage change will be calculated by first running a Power Flow with the load situation, without request and then a Power Flow with the load situation with request.
The reasoning behind this is that the load situation represents the acutal grid operating point at a certain point in time and therefore we only consider how the additional device from the request would affect the grid at that point in time.