Levenkay
Well-known member
I kind of asked this before, but in a reply to an old thread in another forum. So here goes again..
From a massively simplified point of view, the motor drive electronics already seem to provide not only the function that will transfer energy from an AC source (the motor being used in regenerative-braking mode) to the car's battery, but the function for converting the battery's energy into AC power (normally used to supply the motor). What would be the problem(s) in using the regenerative-power-recovery features of the motor drive to charge the battery, by disconnecting the drive electronics from the motor and connecting the drive electronics to the AC line instead? And, after you'd achieved that (probably challenging) bit of switchery, a few control setting tweaks to the driver should make it transfer battery power back into the AC line (it IS an inverter, after all; you just don't need the variable-frequency aspect of it for V2G).
The difference between L1/L2 charging and something faster might then be as simple as connecting to a 3phase power drop instead of a one or two-phase one.
From a massively simplified point of view, the motor drive electronics already seem to provide not only the function that will transfer energy from an AC source (the motor being used in regenerative-braking mode) to the car's battery, but the function for converting the battery's energy into AC power (normally used to supply the motor). What would be the problem(s) in using the regenerative-power-recovery features of the motor drive to charge the battery, by disconnecting the drive electronics from the motor and connecting the drive electronics to the AC line instead? And, after you'd achieved that (probably challenging) bit of switchery, a few control setting tweaks to the driver should make it transfer battery power back into the AC line (it IS an inverter, after all; you just don't need the variable-frequency aspect of it for V2G).
The difference between L1/L2 charging and something faster might then be as simple as connecting to a 3phase power drop instead of a one or two-phase one.