Abstract Increasing penetration of power electronics interfaced generation decreases the stability system, due to absence rotational inertia in their operation. Emulation using converter controls combination with storages can address this issue. However, method relies on use large quantities storage compensate during a transient unbalance. Instead increasing supply, smart transformer (ST), fast...

We study a white dwarf model with differential rotation and magnetic field, for which the symmetry axis of the toroidal field, the magnetic axis of the poloidal field, and the principal axis I3 coincide permanently; the common axis defined this way is called “magnetic symmetry axis”. Furthermore, the magnetic symmetry axis inclines at a small angle χ relative to the spin axis of the model; this...

Attitude control of spacecraft remains a challenging nonlinear control problem of intense practical and intellectual importance. Since rotational motion evolves on the set of proper orthogonal matrices, continuous control must account for the presence of multiple equilibria, whereas discontinuous control laws based on quaternions and alternative parameterizations of the rotation matrices lead t...

Isolation of spacecraft microvibrations is essential for the successful deployment instruments relying on high-precision pointing. Hexapod platforms represent a promising solution, but difficulties associated with attaining desirable 3D dynamics within acceptable mass and complexity budgets have led to minimal practical adoption. This paper addresses influence strut boundary conditions (BCs) sy...

Low inertia levels are typical in island power systems due to the relatively small rotational generation. Displacing generation units with static inertia-less PV results a significant increase frequency volatility. Virtual provided by inverter-storage can resolve this issue. However, low short circuit ratio (SCR) at point of common coupling together fast phase locked loop (PLL) will compromise ...

The problem of frequency stability becomes more concerning as the presence converter-interfaced units increases and conventional generators are suppressed. A decrease in total system inertia, inherently delivered by synchronous generators, results abrupt changes jeopardizes power stability. Therefore, securing sufficient flexible resources with support capability is necessary. rotational masses...

To enhance the anti-inertia disturbance ability of permanent magnet synchronous motor (PMSM) speed system, an adaptive sliding mode control with inertia identification is proposed. A novel (NSMC) based on a new reaching law coupled model reference system (MRAS) realized control, named MRAS+NSMC. In NSMC construct process, integral surface and variable are introduced to avoid differentiation imp...

The magnetorotational instability (MRI) of a weakly ionized, differentially rotating, magnetized plasma disc is investigated in the multi-fluid framework. The disc is threaded by a uniform vertical magnetic field and charge is carried by electrons and ions only. The inclusion of ion inertia causes significant modification to the conductivity tensor in a weakly ionized disc. The parallel, Peders...