Step 2: Create and Analyze a Steady AC Power Flow Scenario

After setting up the network, it is time to define the steady-state ACPF scenario. A scenario comprises events. Events facilitate changing the behavior and state of various objects in our model. This example attempts to mimic a peak load interval where the demands are high, and the PV generators are not producing any power. Keep going to see how to set it all up!

1. Define the events

The model has a pre-prepared reference steady state ACPF scenario Scenario_1. You can find a copy of the scenario file in in the sub-folder .\Electricity Networks\Intermediate Tutorial 1 of the folder Tutorials in the directory (C:\Users\...\Documents\encoord\SAInt-v3\Projects). The set of events of the steady state simulation is presented in Table 1. Take the time to check the events and familiarize yourself with the various input parameters available.

Table 1. Data for the steady state ACPF scenario **Scenario_1**.
Object Name	Parameter	Value	Unit of Measure
PV_0	`OFF`	-	-
PV_1	`OFF`	-	-
PV_2	`OFF`	-	-
PV_3	`OFF`	-	-
PV_4	`OFF`	-	-

There is no need to explicitly define PSET events for the demands. Why? Because in the absence of an event, the value defined for the PSETDEF property is used.

If you are rebuilding this scenario from scratch, add the events using the Excel file "steady-acpf-events.xlsx" from the sub-folder .\Electricity Networks\Intermediate Tutorial 1\Import of the folder Tutorials in the directory (C:\Users\...\Documents\encoord\SAInt-v3\Projects).. Select Data>Import>Event(s) To Electric Scenario (ESCE) from the Scenario tab and specify the location of the file. A message will inform that the events have been correctly imported into the scenario.

Before moving to the next section, please save your project.

2. Run the simulation and analyze the results

You have finished setting up the network and scenario – you can run the simulation now. Go to the Simulation tab and press Electric. During the scenario execution, the progress can be seen in the status bar at the bottom of the screen and in the log window. Once the simulation is finished, a prompt will appear saying the simulation has been completed successfully. You can close the window by pressing OK.

If the scenario execution fails, please review the previous steps and ensure everything is correctly defined. If the problem persists, please do not hesitate to contact our support team for guidance.

For steady-state scenarios, it is easy to see most of the results in the tables available from the Table tab. For example, some of the important results related to the nodes can be found in the ENO table as reproduced in Table 2:

Table 2. Results from steady state ACPF scenario **Scenario_1**.
Node	`VPU` [pu]	`VA` [°]	`P` [MW]	`Q` [MVAr]
ENO_HV	1.040	0.895	0.484	0.155
ENO_0	1.032	0.107	-0.070	-0.021
ENO_1_1	1.009	0.000	-0.070	-0.021
ENO_1_2	0.992	-0.085	-0.070	-0.021
ENO_1_3	0.980	-0.144	-0.070	-0.021
ENO_1_4	0.974	-0.176	-0.050	-0.015
ENO_1_5	0.971	-0.189	-0.030	-0.009
ENO_2_1	1.020	0.048	-0.030	-0.009
ENO_2_2_1	0.994	0.096	-0.015	-0.005
ENO_2_2_2	0.986	0.143	-0.015	-0.005
ENO_2_3	1.011	0.004	-0.015	-0.005
ENO_2_4	0.986	0.143	-0.015	-0.005
ENO_2_5	0.973	0.215	-0.015	-0.005

Observe that the voltage magnitudes are within limits and that the HV grid supplies all the demand. Can you identify which node has the lowest voltage magnitude? You are encouraged to take a look at other tables available in the Table tab.

There are more advanced ways to interact with the results in SAInt. Head to the next part of this tutorial to see how to use IronPython commands and plots to analyze the simulation results.