Frequency excursion mitigation strategy using a novel COA optimised fuzzy controller in wind integrated power systems

M Sharma, S Dhundhara, Y Arya… - IET Renewable Power …, 2020 - Wiley Online Library
The uncertain demeanour from wind generators and loads adversely affect the grid
operational stability. Various control approaches have been explored to remedy the system …

Impact of hybrid electrical energy storage system on realistic deregulated power system having large-scale renewable generation

M Sharma, S Dhundhara, RS Sran - Sustainable Energy Technologies and …, 2023 - Elsevier
Frequency stabilization in the deregulated power system (DPS) becomes more significant
because of increased complexities and uncertainties due to higher penetration of renewable …

[PDF][PDF] Positively Invariant Sets for ODEs and Numerical Integration.

P Giesl, SF Hafstein, I Mehrabinezhad - ICINCO (1), 2023 - scitepress.org
We show that for an ordinary differential equation (ODE) with an exponentially stable
equilibrium and any compact subset of its basin of attraction, we can find a larger compact …

Triangulations and error estimates for interpolating Lyapunov functions

P Giesl, S Hafstein - SN Computer Science, 2023 - Springer
The CPA method to compute Lyapunov functions depends on a triangulation of the relevant
part of the state space. In more detail, a CPA (Continuous and Piecewise Affine) function is …

[HTML][HTML] Simplicial complex with approximate rotational symmetry: A general class of simplicial complexes

S Albertsson, S Hafstein, P Giesl… - Journal of Computational …, 2020 - Elsevier
We study the transformation of the vertices of a certain simple simplicial complex in n-
dimensional Euclidian space and prove that the resulting set of simplices is a simplicial …

Lyapunov Functions by Interpolating Numerical Quadrature: Proof of Convergence

P Giesl, S Hafstein - Dynamical Systems Theory and Applications, 2021 - Springer
Lyapunov functions for nonlinear systems, whose dynamics are defined by ordinary
differential equations, are computed by solving linear programming feasibility problems in …

[PDF][PDF] Efficient Verification of CPA Lyapunov Functions.

SF Hafstein - ICINCO, 2022 - scitepress.org
Lyapunov functions can be used to characterize the stability and basins of attraction for
dynamical systems, whose dynamics are defined by ordinary differential equations. Since …

[PDF][PDF] Simplicial complex with approximate rotational symmetry

S Albertsson, S Hafstein, P Giesl, S Gudmundsson… - shafstein.github.io
We study the transformation of the vertices of a certain simple simplicial complex in n-
dimensional 6 Euclidian space and prove that the resulting set of simplices is a simplicial …