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While field oriented control (FOC) and direct torque and flux control (DTFC) have been established as mature technologies for high performance a.c. motor variable speed drives, scalar (V/f and I-f) control is sufficient for general sensorless, lower cost, a.c. motor drives in applications such as pumps, compressors, ventilators, which constitute the majority in terms of installed power. The present...
In this paper two key features of synchronous reluctance motors (Syn-RM) are analysed and proposed for high electrical torque, power factor & efficiency using finite element method (FEM). The total width of the flux barriers is kept same for all studies throughout. The numbers of flux barriers, location of single flux barrier as well as location of multiple flux barriers are varied. FEM is used...
In this paper, five-level Static Synchronous Compensator (STATCOM) is analyzed with reduced number of power switches. The simulation has been performed by using a digital signal processing unit (DSP) and Matlab/Simulink together. Selective harmonic elimination, single phase real (P) and reactive (Q) power methods are used to control power flow in the delta connected converter. The response of STATCOM...
This paper uses an easy technique to calculate directly the parameters for induction motors, using single- and double-cage models. This technique has been applied in a wide sample of 2167 induction motors, where the parameters have been calculated from manufacturer data. The results show that this technique provides large errors in the start and maximum torque points, but on the other hand, it provides...
This paper presents an attempt to design a high efficiency (90%) 3kW, 3000/3600rpm, 220/240Vrms, 50/60Hz, around (8+2) kg, one phase ac autonomous generator with simplified voltage control of max. (+/− 5%) steady state error. A two salient pole stator, PM rotor configuration with heavily saturated stator core was necessary to reduce the machine reactances well below 1.0 p.u., while also reducing stator...
In the work it was carried out the research on the processes of compensation for three-phase power-supply system with the use of cross-vector theory of instantaneous power in the frequency domain in an analytical form. The obtained results made it possible to propose a method for improvement the compensation of inactive instantaneous power components under harmonic distortions of the mains supply...
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