docs: improve documentation around PRESSURE_CONTROL (#610)

ECALC-606
equinor · Sep 16, 2024 · 94dbce9 · 94dbce9
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diff --git a/...ssor_modelling/compressor_models_types/variable_speed_compressor_train_model.md b/...ssor_modelling/compressor_models_types/variable_speed_compressor_train_model.md
@@ -5,7 +5,9 @@ sidebar_position: 3
 
 In this model all compressors in the train have the same speed, and the model is build on a forward model of
 the fluid properties/state where speed is a parameter. Then the speed is iterated until the discharge pressure of the
-outlet is equal to the requested discharge pressure.
+outlet is equal to the requested discharge pressure. If the resulting discharge pressure is not low enough to meet the 
+requested discharge pressure by iterating on speed only, an attempt is made to find a solution using the defined
+[Fixed speed pressure control](/about/modelling/setup/models/compressor_modelling/fixed_speed_pressure_control/index.md) with the speed fixed at the minimum speed.
 
 This model only supports `User defined variable speed compressor chart`.
 

diff --git a/docs/docs/about/references/PRESSURE_CONTROL.md b/docs/docs/about/references/PRESSURE_CONTROL.md
@@ -1,14 +1,20 @@
 # PRESSURE_CONTROL
 
 ## Description
-`PRESSURE_CONTROL` is required when a compressor model is defined. This dictates how the compressor will be controlled, the method for pressure control are as follows:
+The `PRESSURE_CONTROL` dictates how the compressor will be controlled when running on a fixed speed. The available
+methods for pressure control are as follows:
 
 - DOWNSTREAM_CHOKE (default)
 - UPSTREAM_CHOKE
 - INDIVIDUAL_ASV_PRESSURE
 - INDIVIDUAL_ASV_RATE
 - COMMON_ASV
 
+`PRESSURE_CONTROL` is in use for the following types of compressor trains:
+- [`Single speed compressor train model`](/about/modelling/setup/models/compressor_modelling/compressor_models_types/single_speed_compressor_train_model.md)
+- [`Variable speed compressor train model`](/about/modelling/setup/models/compressor_modelling/compressor_models_types/variable_speed_compressor_train_model.md)
+- [`Variable speed compressor train model with multiple streams and pressures`](/about/modelling/setup/models/compressor_modelling/compressor_models_types/variable_speed_compressor_train_model_with_multiple_streams_and_pressures.md)
+
 Further description on how each pressure control method works can be found in [Fixed speed pressure control](/about/modelling/setup/models/compressor_modelling/fixed_speed_pressure_control/index.md)
 
 ## Format