How to incorporate economic load dispatch information in PV analysis

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Dear all, I want to limit the generation of a few generators in a subsystem "source" while doing PV analysis. I am trying to do this by incorporating an economic load dispatch file (for example savnw.*ecd) during PV analysis but there is no change in generation from generators or there is no change in transfer limit in the base case or contingency case. I want to know what I am doing wrong. In addition to this, it will be very helpful if someone tells me that when we are incrementing loads in "sink" subsystem what happens to the generator present in that subsystem ('sink') or generators present in other subsystems apart from ('source') subsystem. Are those also trying to meet the increment in load?

Thanks in advance