if the systen is like below:
RES + Inverter + Transformer
it will be easy to be done. You need a given output voltage at the secondary side of the transformer with some special features for instance, a given phase- angle. So you should just generate a modified correct voltage by the inverter and apply it to the primary side of the transformer. easy-busy.
However, if the systen configuration is different, the solution can be different.
Maysam Abbasi thanks for your interest in my question. yes my system is stiff DC + Inverter +transformer+Grid. I agree about modifying inverter outputvoltages by adding required phase shift in reference signal of SVPWM algorithm.
Maysam Abbasi you are right. although the phase shift between primary and secondry voltages in DELTA-WYE grounded interface transformer between inverter and grid is compensated by changing the PWM reference signal to controller. However, current on the primary and secondary side of transformer still has phase shift. And i dont know how to compensate it?
Steve Richards sir we are talking about 30 degree phase shift in voltage/current on primary and secondary side of DELTA-WYE grounded interface transformer between inverter and grid
If you are saying the output current to the grid is lagging the voltage too much (poor power factor) then you inverter frequency is too low or your grid has too much inductive load and needs compensated with more capacitance, synchronous motors.
What is is the cause of the 30 degree shift. Does it remain on the grid when you disconnect your inverter?