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This paper proposes a new scheme for robust sensorless vector control of six phase induction motor. The method is based on the model current estimation, in which the controlled stator voltage is applied to the six phase induction motor so that the difference between stator currents of the mathematical model and the motor can be forced to decay to zero. To make a better dynamic response and to reduce...
In this paper two algorithms for sensorless control of induction machines, linear reduced-order and sliding mode observer will be discussed and compared. The linear reduced-order method is a third order disturbance observer which is very simple to design and execute, while the sliding mode observer is complicated. It will be shown by the simulation results that the estimated speed by the two methods...
This paper proposes a new scheme for mechanical sensorless control of symmetrical six phase induction motor. The motor has two sets of three-phase windings, spatially phase shifted by 60 electrical degrees. This sliding mode observer used, is composed of three other observers: current, flux, and speed observers. The estimated currents in the current observer are used in the flux estimation block,...
The use of conventional (single-tuned and high-pass) filters for HVDC systems can be difficult due to the likelihood of resonance caused by single-tuned filters, and considerable power losses in high-pass filters. This paper presents the C-type filter as an alternative to the conventional filtering in HVDC systems, to improve both the power quality and the power factor, and to reduce the power losses...
The presented paper proposes a new scheme for the speed sensorless control of six phase induction motor. This method is based on the current estimation, in which the controlled stator voltage is applied to the induction motor so that the difference between stator currents of the mathematical model and motor can be forced to decay to zero. To make a better dynamic response and reduce the transient...
In this paper, a new sensorless vector control technique for six-phase induction machines (SPIM) is presented. The machine has two three phase stator windings spatially shifted by 30 electrical degrees. The classical vector control of SPIM is employed. The proposed sensorless method does not require flux and speed estimators, it uses only difference between stator currents of the mathematical model...
This paper describes the application of tuned power harmonic filters (PHFs) to a three phase shunt active power filter (APF) for the harmonic minimization created by a nonlinear load. This work is performed in order to show implementation of optimized harmonic power filters to a shunt active power filter can reduce total harmonic distortion (THD) without creating new system resonance. Steady state...
In this paper, a linearized small-signal model for a six-pulse HVDC system is presented. In this paper, the effects of on and off states resistances, forward voltage drop, and snubber circuits of the thyristors and filter circuits are taken into account. RL series circuits are used for modeling of the converter transformer and ac system. To validate the model developed in this paper, a comparison...
In this paper a new method is presented for calculating the harmonic components of DC voltage and positive and negative sequence AC currents of both rectifier and inverter sides of AC HVDC link. The HVDC converters are represented by linearised small signal model and the calculations are based on the Fourier series calculations presented in our last work. To validate the method, a comparison is made...
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