Nonlinear Droop Control for IBR Driven Power Systems

Droop control is a representative control approach that enables decentralized autonomous power sharing for IBR driven power systems. Despite its advantages that contribute to increased reliability and modulairty, however, this approach often results in unavoidable frequency and voltage deviations. In addition, the power sharing performance could be affected by line impedance. To address these challenges, this study considerers application of a nonlinear droop control method aimed at reducing frequency and voltage deviations and showing satisfactory power sharing performance. Verification results demonstrate that the considered droop control approach realizes limited deviation of voltage and frequency compared to the conventional droop control. With the considered nonlinear droop approach, autonomous operation of IBR based power networks with improved power quality and satisfactory power sharing could be achieved.