Hi Adao,
I understand that you want to limit the power generation at the slack bus to prevent it from increasing during the simulation. Since active power delivered by Generator Bus and consumed by Load Bus differ, this means that a power loss equal to the difference between Generator Bus P and Load Bus P is occurring. Since active power delivered by Generator Bus and consumed by Load Bus differ, this means that a power loss equal to the difference between Generator Bus P and Load Bus P is occurring. Therefore, to supply power loss, an extra Generator bus is considered for which bus magnitude and voltage is specified and active power and reactive power are to be calculated. This active power of slack bus is the equivalent power loss occurring in different system. To limit the power at the slack bus you can try setting constraints on the Generator power outputs as well as the Load bus generator power outputs.
Hope this helps.
Thank you
