in this paper, stabilization conditions and controller design for a class of nonlinear systems are proposed. the proposed method is based on the nonlinear feedback, quadratic lyapunov function and heuristic slack matrices definition. these slack matrices in null products are derived using the properties of the system dynamics. based on the lyapunov stability theorem and sum of squares (sos) dec...

in this paper optimal torque control (otc) of stand-alone variable-speed small-scale wind turbine equipped with a permanent magnet synchronous generator and a switch- mode rectifier is presented. it is shown that with otc method in standalone configuration, power coefficient could be reached to its maximum possible value, i.e. 0.48. an appropriate control algorithm based on turbine characterist...

This paper introduces a new method to model the permanent magnet synchronous machines (PMSMs) with saliencies due to the salient structure and magnetic saturation. Two parameters are defined to indicate these saliencies, i.e. the structural saliency ratio (Kstr) and the saturation saliency ratio (Ksat). To verify the nonlinear model, a real PMSM is tested and numerically simulated. The nonlinea...

Jun-qiang Lian, Shun-yi Xie , Wang Jian,Ping Hu Department of Weaponry Engineering., Naval University of Engineering, Wuhan 430033, China [email protected] Department of Weaponry Engineering., Naval University of Engineering, Wuhan 430033, China Higher Education Research Units., Naval University of Engineering, Wuhan 430033, China Department of Weaponry Engineering., Naval University of Engineer...

The article presents the concept of an electromagnetic circuit generator with permanent magnets mounted on the surface rotor core designed for single phase work. Computation field-circuit model was shown. The spectrum of time course of voltages in the idle work was presented. The cross section with graphically presentation of magnetic induction in particular parts of electromagnetic circuits wa...

This paper studies the use of the PMSM (permanent magnet synchronous machine) generators instead of the induction based alternating current generators in renewable energy sources (wind turbines, combined heat and power, etc.). The paper considers the most significant advantages of the novel permanent magnet technology such as increased specific power, high torque, reduced maintenance costs, inc...