Impact of Low Rotational Inertia on Power System Stability and Operation

Abstract Large-scale deployment of Renewable Energy Sources (RES) has led to significant generation shares of variable RES in power systems worldwide. RES units, notably inverter-connected wind turbines and photovoltaics (PV) that as such do not provide rotational inertia, are effectively displacing conventional generators and their rotating machinery. The traditional assumption that grid inertia is sufficiently high with only small variations over time is thus not valid for power systems with high RES shares. This has implications for frequency dynamics and power system stability and operation. Frequency dynamics are faster in power systems with low rotational inertia, making frequency control and power system operation more challenging. This paper investigates the impact of low rotational inertia on power system stability and operation, contributes new analysis insights and offers impact mitigation options.

[1]  J. Morren,et al.  Contribution of DG units to primary frequency control , 2005, 2005 International Conference on Future Power Systems.

[2]  M. O'Malley,et al.  The inertial response of induction-machine-based wind turbines , 2005, IEEE Transactions on Power Systems.

[3]  Hisashi Q. Higuchi On the nature of , 1999 .

[4]  Ren Renewables 2019 Global Status Report , 2012 .

[5]  Goran Andersson,et al.  Power and energy capacity requirements of storages providing frequency control reserves , 2013, 2013 IEEE Power & Energy Society General Meeting.

[6]  H.-J. Kunisch,et al.  Battery Energy Storage Another Option for Load-Frequency-Control and Instantaneous Reserve , 1986, IEEE Transactions on Energy Conversion.

[7]  E. Welfonder,et al.  Improvement of the Performance of Scheduled Stepwise Power Programme Changes within the European Power System , 2008 .

[8]  W. Dürrschmidt,et al.  Renewable energy sources in figures: national and international development. , 2010 .

[9]  A. Oudalov,et al.  Optimizing a Battery Energy Storage System for Primary Frequency Control , 2007, IEEE Transactions on Power Systems.

[10]  P. Tielens,et al.  Grid Inertia and Frequency Control in Power Systems with High Penetration of Renewables , 2012 .

[11]  P. Kundur,et al.  Power system stability and control , 1994 .

[12]  G. Andersson,et al.  On the nature of unstable equilibrium points in power systems , 1993 .

[13]  Nadejda Komendantova,et al.  Renewables 2012 Global Status Report , 2012 .

[14]  Pravin Varaiya,et al.  Foundations of direct methods for power system transient stability analysis , 1987 .

[15]  Goran Andersson,et al.  General frequency control with aggregated control reserve capacity from time-varying sources: The case of PHEVs , 2010, 2010 IREP Symposium Bulk Power System Dynamics and Control - VIII (IREP).

[16]  T. Thiringer,et al.  Temporary Primary Frequency Control Support by Variable Speed Wind Turbines— Potential and Applications , 2008, IEEE Transactions on Power Systems.

[17]  N. Kopell,et al.  Chaotic motions in the two-degree-of-freedom swing equations , 1982 .

[18]  Göran Andersson,et al.  Predictive control for real-time frequency regulation and rotational inertia provision in power systems , 2013, 52nd IEEE Conference on Decision and Control.

[19]  A. R. Coldstream Florence , 1891 .