A novel virtual synchronous generator control strategy based on improved swing equation emulating and power decoupling method

摘要

A novel practical virtual synchronous generator control strategy considering the differences between inverters and real synchronous generators is proposed in this paper. The proposed control strategy improves the emulation method of damping power in swing equation, which does not need a PLL and in the meanwhile eliminates the effect on the droop coefficient caused by the traditional constant damping factor. Avoiding a differential term, a virtual synchronous impedance is implemented in synchronous rotating reference frame in order to tackle the issue of power coupling caused by the high line impedance ratio R/X. Furthermore, a novel power decoupling method by introducing current compensation into the current loop is proposed to eliminate the power coupling caused by the large power angle, which can noticeably eliminate the power dynamic oscillation and steady-state error. Finally, both the simulation and experimental results validate the effectiveness of the proposed method.