Influence and suppression of grid-connected solar power plants on low frequency oscillation

Taking large-scale solar power plants into multi-machine power system as the research object,through the method of modal analysis and time domain analysis, firstly, the linear equations of the state equation of the multi - machine system is deduced,and then a four-generator two-area test system with solar power plants is set up. Research results indicate that different access points and different permeability of solar power plants can affect the low frequency oscillation of multi-machine systems,grid-connected solar power plants did not produce a new oscillation mode. The use of integrated power modulation design of the photovoltaic wide-area additional damping controller can suppress low-frequency oscillation. © 2020, Editorial Board of Acta Energiae Solaris Sinica. All right reserved.