Dynamic and steady state behavior of a synchronous reluctance machine with leading reactive power through an auxiliary winding

Abstract In attempt to improve the performance of synchronous reluctance machine the structure of the machine is modified to include an additional winding on the stator and injection of capacitance. This paper examines the dynamic and steady state behaviour of the modified machine based on its mathematical model and experiments performed on a practical prototype. The experimental results corroborate the solutions of the mathematical model as obtained through simulation. The modified machine shows significant improvement in performance over the conventional one

Analysis of synchronous reluctance machine with magnetically coupled three-phase windings and reactive power compensation

Abstract: Synchronous reluctance machine with simple salient rotor is known to have poor power factor because of its poor reactance ratio. This study presents the use of an auxiliary winding attached to a balanced capacitor to improve the effective reactance ratio as well as the performance characteristics of synchronous reluctance machine. A unique feature of this configuration is that although the machine runs at synchronous speed, the effective reactance ratio of the machine can be improved by appropriate sizing of the capacitor attached to the auxiliary winding, with the constraint of the ampere turn rating of the auxiliary winding. The operational characteristics of a simple salient rotor synchronous reluctance machine equipped with this configuration were investigated and shown to have a desirable performance. How the effective reactance ratio, power factor and airgap flux distribution depend on the size of capacitor attached to the auxiliary winding is determined using a simplified mathematical model of the system. Analytical results and experimental measurements are in good agreement, and demonstrate the effectiveness and benefits of the configuratio

Synchronous reluctance machine with controlled capacitance injection

Abstract This paper describes a detailed analysis, verified by practical experimental results, of a synchronous reluctance machine with two similar stator windings and capacitance injection using a static switch. The steady state equivalent circuit is developed and used to investigate leading capacitance injection into the machine via a balanced three phase auxiliary winding that is only magnetically coupled to the main winding. The scheme was found to improve the torque and power factor performance of the machine as well as reduce harmonics in the line current. Two switching topologies were utilized for the static control in this arrangement, and both were found to present good and comparable results. Experimental results corroborate the simulations

Synchronous reluctance machine with magnetically-coupled, double three-phase windings

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Performance evaluation of a three-phase induction machine with auxilliary winding fed by a leading reactive current

Abstract In this paper the performance of three-phase induction machine equipped with a three-phase auxiliary winding which is only magnetically coupled to the stator main winding is evaluated. A capacitive load is connected in parallel to each phase of the auxiliary winding and serves to inject a leading reactive current into the machine. Steady state and dynamic performance of the machine are evaluated under various loading and compensative conditions. The experimental results show that it possible to obtain a comparatively good power factor with a fixed capacitive load for various loadings of the asynchronous machine

Wind‐Driven Self‐Excited Reluctance Generator for Rural Electrification

This chapter presents the dynamic performance of an isolated wind‐driven self‐excited reluctance generator (WDSERG) for rural electrification application. The performances of the machine under conditions of constant wind speed, varying wind speed, constant load, and varying loads are analysed and presented. The modelling and simulation have been carried out using MATLAB‐Simulink. A step‐wise procedure clearly set forth for the Simulink implementation of the wind‐driven machine forms the balance of this work, which can be a good teaching aid. The result shows that with the variations in the connected loads, the output frequency of SERG remains constant, which makes it a good alternative for rural electrification

Improving synchronous reluctance machine performance by direct capacitance injection through an auxiliary winding

Abstract: Synchronous reluctance machine with a conventional rotor structure and a 3-phase auxiliary winding attached to a balanced capacitance for power factor improvement will find application in high speed , high power drives. This paper presents an understanding of its operation using the electromagnetic as well as the electric circuit concepts. Analytical and simulation results of this machine configuration show that the torque as well as the power factor performance is better compared to conventional reluctance machine

Performance analysis of capacitance compensated dual stator winding synchronous reluctance machine

Abstract: Synchronous reluctance machine with simple salient rotor are known to have poor power factor because they have a low effective reactance ratio. This paper used a 3 phase auxiliary winding and balanced capacitance compensation to ifluence the effective reactance ratio of a synchronous reluctance machine with simple salient rotor structure, such that its power factor and torque/ampere performance is improved. A mathematical model and dq equivalent circuit suitable for dynamic and steady state analysis was developed and used to study the synchronous operation of this machine.Analytical as well as experimental results for a 4-pole, 36 slots simple salient rotor reluctance machine showed that the effective reactance ration increased with the capacitance size, and the machine operated at a maximum power factor of 0.969 without altering the geometry of the rotor. the torque per ampere of the machine also improved with the size of capacitor attached to the auxilary winding