Current Control and FPGA–Based Real–Time Simulation of Grid–Tied Inverters

In this paper, the current controller synthesis and real-time testing in a grid-tied inverter system is discussed. The current loops are implemented using an observer-based linear quadratic regulator. The disturbance observer is employed to ensure zero steady state error in the presence of model uncertainties. A simulation model implemented in Simscape™ Electrical™ is used to evaluate the control algorithm in real-time on a Speedgoat real-time system with a field-programmable gate array FPGA board. The results show the effectiveness of the proposed solution.