Sinusoid-locked Loops - Control of Power Inverters in Renewable Energy and Smart Grid Integration - page 366

Figure 23.2 Structure of the sinusoid-locked loop (SLL)

The stator current i , which is the inductor current in the case of a synchronverter, should
be generated internally as the voltage difference between e and

v divided by the virtual

synchronous reactance X s ( s ) = sL + R , i.e.,

− v
sL

e

i =

R . +

This forms the (virtual) current feedback loop, which is crucial for the synchronisation
process.