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Sorry for the late response. I am very thankful for the fast response. The problem I raised has been resolved as I used REECC to regulate the frequency following load shedding /generation trips. I simulate the frequency event; I have the following points to discuss: 1. I have enabled the frequency flag in REPCA, set the Dup and Ddn values, and the time required for charging/discharging. Also, I set the SOCinit to 0.65, SOCmax to 0.85 and SOCmin to 0.20. Doing so while simulating it is effective for downregulation (simulating load shedding). 2. In The same setting when I used for up-regulation (simulating generation trips), energy storage does not have any response to a frequency deviation. 3. Please put me some lights possible reasons if there are? What parameters must I look in order to perform up-regulation(Dup).