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How to manually implement load dropping (exact MW amount) during dynamic simulation?

I need to see the impact of varying load dropping amount to system frequency after tripping of a large generating plant. For easier execution especially with scenarios requiring thousands of MW of load to be dropped due to multiple outages of generating plants, I tried to use SCAL activity to reflect my desired amount of load to be dropped. However, upon checking based on the initial and final load total through SCAL activity, the desired amount of load drop was not accurately reflected. It is essential for my study to determine the frequency response given the exact amount of total load drop.