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A model-free control scheme is proposed for a surface mounted permanent magnet synchronous motor (SMPMSM) drive system with parametric uncertainties and inverter nonlinearity. Using only the input and output data of system, the ultra-local model of SMPMSM system is first set up and the proposed ultra-local model is able to accurately identify the nonparametric model of SMPMSM system with the unknown...
Based on Finite Element Analysis (FEA) of Permanent Magnet Synchronous Motor (PMSM), after taking into account of magnetic saturation and cross-coupling effect, the relationship between flux linkage and stator current becomes nonlinear. Making use of two-dimensional surface to fit the flux linkage and stator current, then solving partial derivative to the fitted flux linkage with respect to stator...
This paper describes the effect of electrical parameters of the double fed induction generator on the transient voltage stability of a DFIG to a simple grid; the DFIG model has been developed in the Matlab/simulink tool. The dynamic behavior of a wind turbine connected to a grid is examined. A three-phase fault is applied close to the wind turbine. The effect of different electrical parameters of...
Small signal stability analysis is conducted considering grid connected doubly-fed induction generator (DFIG) type. The modeling of a grid connected DFIG system is first set up and the whole model is formulated by a set of differential algebraic equations (DAE). Then, the mathematical model of rotor-side converter is built with decoupled P-Q control techniques to implement stator active and reactive...
In this paper, the time-delayed feedback control method is introduced to stabilize unstable equilibrium points undergoing Hopf bifurcation for an induction motor (IM) drive system. Stability criterion of a nonlinear time-delayed system is first established, and then an effective procedure is shown how to stabilize the unstable equilibrium points by suitably select the feedback gain k and the time-delay...
In this paper, a method is presented and achieved to accurately determine Hopf bifurcation point for an induction motor (IM) drive system, and Hopf bifurcation diagram is showed to indicate evolvement of the equilibrium points from steady state to undergoing Hopf bifurcation and then achieving stabilization again. At last, the classical Floquet theory is applied to confirm the limit cyclepsilas stability.
Sustained oscillation of rotor speed is often experienced in PWM inverter induction motor (IM) drive systems. In this paper the sustained oscillation phenomena is investigated from the point of view of Hopf bifurcation theory. The sufficient and necessary conditions for existence of limit cycle are presented to determine bifurcation set in plane of stator voltage versus stator frequency. This research...
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