Power Decoupling Method for Droop-controlled Converter Based on Reactive Power Compensation

Converters with grid-forming (GFM) control strategy can provide support to the grid, which is regarded as an important measure to improve system stability. However, distributed generation (DG) units are usually connected to the low-voltage grid, and there is a serious power coupling problem between P and Q due to the large impedance ratio (R/X). Virtual impedance (VI) is the most commonly used power decoupling method, but its voltage compensation capability is limited, which makes its decoupling ability restricted. In this paper, the causes of power coupling are analyzed, and a droop-controlled converter decoupling method based on reactive power compensation is proposed to address the shortcomings of the traditional VI method, and simulations are built in PLECS to verify the correctness and effectiveness of the method.