1. The problem statement, all variables and given/known data Currently, I'm doing on a research of this three phase PV grid tied system. I found a model and try to run and simulate for further understanding. There's an attachment of a model three phase pv grid tied system in Simulink. However, I've a hard time understanding the MPPT and also the subsystem part in the model. Can anyone guide me on this? Many thanks. 2. Relevant equations 3. The attempt at a solution I tried to place sink block to get the readings on every line. However, I have no idea how to get the value after the signal going through the memory block. I would like to know how it works. Meanwhile, for the subsystem, I guess it's a combination of solar equations.