Rotor Angle Stability with Different Penetration Levels of Wind Generation in the Sending Grid

The rapid development of new energy at home and abroad, ultra-high ratio of new energy grid-connected operation will become an important feature of the future power supply structure. At present, there is no clear conclusion about the positive or negative impact of new energy grid-connected on the stability of the system power angle. This paper focuses on the influence of wind power access on the stability of the AC synchronous grid. This paper analyzed the equivalent impedance with different penetration levels of wind generation in the sending grid. When the wind generators operated only with active power, the equivalent impedance would increase gradually with the higher and higher penetration levels of wind generation in the sending grid. Furthermore, using the IEEE 140 bus test system, the paper calculated the critical clearing time of the tie lines. The results showed that the critical clearing time would become shorter and shorter with the increase of wind generation in the sending grid. That is, the penetration of wind generation in the sending grid worsens the rotor angle stability of the system, which verified the theoretical analysis.