A grid voltage perturbations based bidirectional impedance uniform control for grid‐connected DC/AC converter

Abstract For bidirectional grid‐connected DC/AC converters, the power flow variation substantially alters system stability, and especially severs under heavy load. Towards this problem, paper proposes a novel impedance uniform control method to eliminate stability degradation variations, which is achieved by reshaping converter negative incremental resistive in fragile mode. The d‐axis voltage perturbation extracted dynamically modify active current reference. Hence, damping performance can be simultaneously improved dedicated design. Without switching modes or sacrificing dynamic performance, maintain satisfied variations. Finally, effectiveness of proposed has been validated both simulations experiments.