I have a system with a generator conected to transformer and this connected to a swing bus and when I apply a voltage step of 2%, I want the reactive power to go from -12 Mvar to 8 Mvar. But it only increases from -12 Mvar to -3 Mvar.
A couple of questions: 1. Did you use a PLBVFU1 model at the system slack to perform the voltage step test? 2. Was your generator connected to an excitation system?
When I perform step response tests, I use PLBVFU1 model for the system slack bus and provide step input playback signals (e.g., voltage and frequency). I will let the generator and plant control models respond and from there do the necessary parameter adjustments in order to obtain the desired response and output levels.
You are applying a 2% voltage change and get 9 Mvar change, but you want to get 20 Mvar change instead!? If so, you have to change the transformer reactance with the factor 9/20, i.e. multiply the reactance with 0.45.
Comments
Generators control voltage. They will put out whatever Mvar is needed to control a voltage. Sounds like you want to control Mvar and voltage independently, but they are dependent on eachother..