Influence of wind turbine inertia support on frequency drop characteristics of power grid

Abstract

With the increasing penetration of new energy sources in large synchronous grids， renewable generator units that do not have inertial response capability may undermine the inertia of the system. In response to this problem， scholars have proposed a variety of inertia support methods for wind turbines and verified the effect of wind turbine inertia support in the IEEE standard example system. However， there are few research concerning the effect of wind turbine inertia support on the transient frequency stability of synchronous large grids. For this reason， the paper firstly analyzes the frequency drop characteristics in the case of power deficit in large power grid after the renewable generator penetration increase by fault time sorting， typical example simulation and mathematical model analysis. Moreover， the influence of wind turbine inertia support on the frequency drop characteristics of large power grids is studied. Finally， the influence of the inertia response on the primary frequency modulation is analyzed when the wind turbines simultaneously perform inertia and primary frequency modulation support. The results show that different wind turbine inertia support methods have different effects on the system frequency drop， and that some inertia support methods may lead to drastic frequency drop.

Keywords

• frequency stability
• synchronous grid
• fan frequency modulation
• inertia response
• primary frequency modulation