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Corrective Action - Subsystem Definition

Hello All, I have implemented an automation program that does power flow, contingency analysis and corrective actions for the lines that are overloaded over 100% of the specified limit. However, the problem that I have is PSSE only gives an option to define a subsystem where generation will be redispatched (increment and decrement of generators in same area) to mitigate the overloads as part of corrective action and this works as designed. I wanted to go further ahead and say that I wanted to decrement generators from particular area and increment generators particularly from another area such that inc/Dec is not performed in the same area and I’m not sure how do I define that in the subsystem definition for redispatching generators.