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In this paper, a novel dynamic model of a self-excited induction generator (SEIG) is presented. In the proposed model, the fundamental stray load and iron losses are accounted for in a way that preserves the order of the conventional induction machine (IM) model. The corresponding equivalent resistances are determined from the standard tests. The SEIG has been considered as part of a wind conversion...
the goal of this paper is to present a comprehensive method to optimize the dq reference frame current of a permanent magnet synchronous machine (PMSM) including both copper and iron losses. The originality of the article concerns on the one hand the direct consideration of a resistance modeling iron loss in the circuit model and on the other hand the simplicity of the proposed method. In the paper,...
In this work, parameters of the equivalent circuit of a small induction motor with gearbox are experimentally extracted using standardized tests. Such parameters are used to formulate the nonlinear dynamic model of the motor in the d-q frame. To demonstrate the validity of the resulting model, a nonlinear multivariable sliding mode controller that uses the extracted parameters in its formulation is...
The transversalflux machine DYNAX is a high torque and power density machine. Unlike conventional rotary field machines the transversalflux machine consists of three single phase stators with coupling by a common rotor for constant torque generation. Therefore models of conventional machines cannot be used to describe the entire behavior of the DYNAX, even if the fundamental voltage and current waves...
Precise modeling of PMSM needs considering the nonlinear characteristics of the hard and soft magnetic materials used in the machine. Therefore nonlinear machine models with time-variant parameters are used. Usually saturation is modeled in the field oriented coordinates assuming that the d-axis flux affects the q-axis flux and vice versa. If certain conditions are fulfilled cross saturation inductances...
The reliability of the PMSM drives is the one of critical factors in several industries, in particularly, the areas where the precise operation and/or high performance are required. This paper proposes a novel diagnosis scheme using Extend Kalman Filter (EKF), especially, in subject to the open-phase faults of the inverter switches. The stator resistances of PMSM are estimated by the EKF in real time...
In this paper, a new technique for on-line detecting inter-turn stator winding fault in Permanent Magnet Synchronous Machine (PMSM) is presented. It is based on a residual analysis improved by adding a back-EMF waveform estimation system which allows identifying real back-EMF frequency components of the healthy machine. Then, a simple current residual monitoring permits us to detect the fault and...
For DFIG (doubly fed induction generator)-based wind turbines, crowbar is a commonly used protection method against surge current caused by sudden drop of the grid voltage during the period of LVRT (low voltage ride-through). Based on detailed analysis of the transient flux characteristics of DFIG with the crowbar fired, a simplified model is proposed to analyze and approximate the short circuit current...
This paper discusses a problem of modeling induction machines when some faults appear in a cage by using a model reduced to four equations. Starting from an advance mathematical model with full representation of a cage and considering arbitrary cage faults the steady-state equations are developed. Those equations are reduced to four equations using symmetrical components of stator and rotor quantities...
This paper proposes a method for including both hysteresis losses and eddy current losses in the dynamic space vector model of induction machines. The losses caused by the rotation and magnitude changes of the flux vector are taken into account. The model can be applied, for example, to time-domain simulations and real-time applications such as drive control. Finite element analysis, simulations,...
Calculation of short circuit current is an important task for wind farm and power system. In this paper transient of DFIG is analyzed under short circuit condition, and the theorem of constant flux linkage is applied to determine short circuit currents in the synchronously rotating reference frame dqo. Then, transient response of different order models considering or ignoring this theorem is obtained...
Recently, a modified equivalent circuit has been proposed for the induction machine model where a single branch rotor resistance is changing as a function of speed to better predict the low-frequency deep-rotor-bar effect. This paper presents an online parameter identification procedure based on capturing the start-up transient and loading of the motor. The proposed procedure is simple and carried...
In this paper, a novel model for surface-mount PM (SPM), which takes the iron losses and machine parameters variation into account is presented. If the voltage of the copper resistance is ignored in the electric drive running at a high speed, the traditional equivalent circuit with a serial and parallel circuit could be transformed into a simple parallel circuit. The phasors diagram and two-axis equivalent...
Helical flux-compression generators convert the chemical energy bond in explosives into electric energy. This paper briefly presents a model of, implemented in Matlab-Simulink, and simulation results for such a device. The simulation results are compared to experimental data from two experiments with identical generators but with different seed currents, influencing the resistive losses and thus the...
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