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The paper presents a comparative analysis of a three-phase induction motor that operates connected to the industrial supply system and separately to a six-phase supply source, as well. The design of the electric machine is made in such a way to fit for both situations. The six-phase supply, which is composed of two distinct three-phase systems, was configured for two cases: 30° and 60° phase shifting...
This paper introduces an alternative tool for stator current envelope extraction in induction motors (IMs) aiming for identifying broken rotor bar (BRB). A new timedomain signal processing algorithm using second order generalized integrator-adaptive notch filter (SOGI-ANF) is introduced for online extraction of both steady state and transient envelopes. The adaptive nature and the structural simplicity...
This paper introduces an alternative tool for stator current envelope extraction in induction motors (IMs) aiming for identifying broken rotor bar (BRB). A new time-domain signal processing algorithm using second order generalized integrator-adaptive notch filter (SOGI-ANF) is introduced for online extraction of both steady state and transient envelopes. The adaptive nature and the structural simplicity...
A theoretical study of the electromechanical transient after switch-on at standstill of an induction motor with rotor asymmetry is carried out. Purpose of this study is to assess the influence of the motor parameters on the amplitude and the duration of the electrical and the mechanical transient. Subsequently the influence of the transient characteristics as well as of the applied current time-frequency...
In this paper a new method to determine load conditions for the load rejection tests for salient pole synchronous machines q-axis parameters determination is introduced. The method is based on the solution of a non linear system that is deduced from the equations of active and reactive power as functions of the different angles defined in the salient pole synchronous machine phasor diagram. With the...
This paper presents a derivation for the maximum transient current and torque peak values for small non-salient line starting permanent magnet synchronous machine (LSPSM) on base of permissible approximations. First the equations for locked rotor operation and secondly for constant speed operation are deduced. This paper is focused on derivation of the analytical calculation process to get an approach...
The paper analyzes the transient reaction of squirrel cage induction machines to voltage step excitation. The involved excitation technique uses the drive's inverter to excite the machine with voltage steps. The transient nature of these steps demands high flux linkage derivatives. In response, the squirrel cage acts as a barrier hindering the flux to penetrate the rotor yoke and forcing it into the...
In this paper, a nonlinear dq model is proposed for transient simulations of a salient-pole wound-rotor synchronous machine. Despite the nonlinearity between the flux linkage and the current, it is shown, thanks to a validation based on finite element simulations, that the new model is efficient for saturated transient state of the machine. This method allows obtaining more accurate results than classical...
The stator transient DC flux component emerges in the Double Fed Induction Generator (DFIG) following grid voltage dip, which results in an important influence on the controllability of rotor converter. In this paper, the research focuses on the responding time of the dynamic reactive current injection referring to DFIG with the crowbar protection under Zero Voltage Ride-Through (ZVRT). Firstly, theoretical...
The present paper reports on electromagnetic modelling and transient analysis of a twelve-stator-pole, eight-rotor-teeth, three-phase switched reluctance generator (SRG) as the main part of a micro-wind energy conversion system. Since SRG performance depends on its control capability to minimize the electromagnetic torque ripple, the determination of optimal commutation pattern of SRG-side power converter...
This work introduces a phasor diagram based method to determine load conditions for which the round rotor synchronous machine armature current is on the quadrature axis. This load condition is necessary to determine synchronous machine quadrature axis transient and subtransient parameters from a load rejection test. Nowadays there is no analytic method to determine this load condition and, if a load...
This paper proposes a control strategy to improve the high voltage ride-through (HVRT) capability of doubly fed induction generator (DFIG)-based wind turbines in the event of a grid voltage symmetrical swell fault. The proposed solution is performed by an efficient control of a series grid side converter (SGSC), which suppresses the transient DC component of the stator flux. Thereby, the overvoltage...
In Australian medium voltage (MV) distribution networks, the majority of embedded local generation (LG) uses synchronous machine based technology. LG units with a synchronous generator can easily be dispatched and controlled to provide or absorb reactive power and thereby locally supporting the system voltage and increasing the voltage stability margin. The fast response from a synchronous machine...
The paper analyses the influence of induction machine (IM) design on rotor slotting harmonics used for sensorless control strategies. These harmonics have a direct impact on flux and rotor position estimation accuracy. Therefore prediction of their magnitude helps in selecting suitable machine designs with regard to stator/rotor slotting and winding configuration. The paper at hand focuses on the...
This paper aims to observe the dynamic behavior of synchronous generators during symmetrical faults and load rejection occurrence. So, a new proposed simulation technique was developed to simulate the synchronous generator characteristics in one simulation block using MATLAB SIMULINK Program. This block is simple, easy to use and it completely describes the electrical characteristics of synchronous...
Transient analysis is key point for studying on Doubly-Fed Induction Generator (DFIG) for Low Voltage Ride Through(LVRT). Lots of assumptions and approximations are made in conventional analysis, such as ignored stator resistance or rotor fixed voltage. It cannot accurately describe the transient performance. In this paper, according to the mathematical model of DFIG, transient characteristic is analyzed...
This paper addresses the design of an induction motor for electric vehicle applications. The motor is required to give very high transient torque during accelerations will being efficient under steady state operation. The paper discussed the required torque-speed envelope and develops a design which is suitable. The analysis techniques includes the use of a spreadsheet design package, a finite element...
The paper deals with the novel control system for five phase induction motor (IM) that enables the injection of the rotor flux 3rd harmonic component. Two multiscalar models are transformed from the α1−β1 and α2−β2 vector models developed in the 1st and 3rd harmonic planes. Based on the obtained multiscalar models the synthesis of dual multiscalar control is established. The obtained two multiscalar...
Sensorless field oriented control (FOC) strategies have found their place in industry applications during the last few years. Stimulated by this development scientific research continues to improve their performance, which is directly linked to the estimation accuracy of flux and rotor position without a mechanical sensor by means of high frequency or transient excitation. The influence of induction...
For predicting the performance characteristics of highly utilized induction machines, commonly finite element analysis (FEA) is applied. If only the stationary behavior is of interest, both time-harmonic and transient calculations are feasible. Both procedures offer benefits and drawbacks regarding precision and computing time. In this paper the stationary torque-slip-characteristic of a squirrel...
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