Decoupled control of grid connected inverter with dynamic online grid impedance measurements for micro grid applications
A Decoupled control of grid connected inverter using dynamic grid impedance for a micro-grid application is presented. Varying network configuration of micro-grid due to renewable sources makes the line impedance to vary during the operation. The mismatch between the actual and the decoupling impedances cause transients during step change in power references. In this paper the impedance for decoupling is obtained and updated in the control loop dynamically by measuring it online. A perfect decoupling with independency in inverters active and reactive power control is achieved without any transients.
grid impedance measurement micro grid current control of inverter synchronous reference frame dq decoupling