A vector controlled single-phase voltage source inverter with enhanced dynamic response

Vector (dq) control is a powerful technique used in high dynamic performance inverters. The transformation of ac into dc quantities allows the controller to be designed as for dc-dc converters, with infinite gain at the steady-state operating point for zero steady-state error. It can be easily implemented for three-phase inverters but presents some challenges for single-phase ones. The orthogonal component (β) required for the stationary to rotating frame transformation does not exist and is usually created by phase shifting the real one (α) by ¼ of a line cycle, what deteriorates the dynamic response. Recently an approach where the orthogonal quantity is obtained by emulating a fictitious orthogonal circuit has been proposed. This paper shows that the results obtained with this new approach are better than with the ¼ line cycle delay and that the α and β components become identical to those of a three-phase inverter. Simulation and experimental results are presented.