grid energy storage battery

this circuit was built to simulate energy storage at the low voltage network.

the grid is simulated by a 3 phase source, rest of the system by a constant RL load. A 13kV/240V step down transformer supplies a community represented by the grey block. data (24 hrs duration) is fed to this block by the look-up tables. THE GRID PART WORKS.

the storage section (in blue) has a rectifier and inverter part which switch on and off depending on grid voltage. I seem to be getting an error (as shown on the screenshot) and cant seem to figure out the real problem.

Any help would be greatly appreciated.

PS: I cant upload the data file along so I've posted it separately. Will add the link as soon as its been cleared for posting.