Grid Voltage Feedforward control of GFI for Improving Dynamical Performance

Abstract

The grid-forming inverter (GFI) is widely used due to its outstanding features of voltage and frequency support ability. However, its poor dynamic response is becoming a challenge. In this paper, a voltage inner loop feedforward control strategy is proposed to speed GFI response. The voltage reference value is feedforward to the voltage inner loop improving the dynamic response. This paper firstly analyzes the grid-forming inverter technology, then deduces its transfer function according to the control block diagram of the voltage inner loop, and makes theoretical analysis of the proposed method by using the bode diagram. The conclusion is that the voltage inner loop feedforward control can accelerate the dynamic response of the system. Finally, combined with MATLAB/Simulink simulation and experiments, the effectiveness of the proposed control strategy is further verified.