Huh! Today I learned that inverter technology is advanced enough that batteries can also provide inertia and powergrid frequency control that flywheels were used for!
All (grid tied) inverters technically provide that function. An inverter doesn’t just generate 50/60 Hz sine, it supplies power by attempting to slightly “push” the frequency higher, i.e lead, to provide power.
if there’s no more power to provide, it “pushes less”.
AC voltage must stay within spec, and the grid has voltage control in place, but that’s not what determines the direction of power flow. Like, what makes the inverter output power rather than draw it?
In fact that’s how individual sections of the grid set power flow limits, by ensuring they stop leading when they reach their max capacity. fascinating really
