Analysis on the inertia and the damping characteristics of DFIG under multiple working conditions based on the grid-forming control

Abstract

The rapid development of wind power not only provides clean energy, but also brings new challenges to the reliable operation of power system, the high proportion of wind power connected to the grid has caused significant changes in the power supply composition structure of the power system. The wind power has become the major power sources of the power system, which brings great challenges to the dynamic process and stability of the system. In order to deal with the problems of inertia reduction, system frequency dynamic deterioration and stability reduction caused by the grid connection of wind turbines under the traditional PLL control, the wind turbines based on the grid-forming control can realize synchronous operation with the power grid without relying on the phase-locked loop. Providing active support for power grid and other excellent characteristics are being widely studied and applied in academia and industry. The dynamic characteristics of the grid-forming control wind turbine will gradually become an important factor determining the dynamics of power system. The influence of the inertia and damping characteristics on the performance of the grid-forming wind turbines is significant. Therefore, the research on the dynamic characteristics of the grid-forming wind turbine and its influence on the system dynamic process has important significance and value. Taking the DFIG based on the grid-forming control as the research object, this paper analyzes and studies the modeling, inertia characteristics and damping characteristics of the grid-forming DFIG under multiple working conditions. The simulation results show that there is a coupling relationship between the inertia and the damping, the inertia and the damping under different working conditions have different characteristics.

Keywords

• Wind power
• The grid-forming control
• The inertia
• The damping