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This paper proposes a dead-time compensation method with a disturbance observer and a current controller for V/f control. Dead-time compensation is very important to improve motor drive performances in the low speed region. The proposed compensation method is composed in the d-q rotational frame. The ripple of the d-axis current caused by the dead-time is suppressed by an auto current regulator, the...
The most commonly used methods for design of the industrial speed controllers are: experimental, root locus, frequency and optimization methods. The most commonly used experimental methods are Ziegler-Nichols methods: stability margin and step response function. Ziegler-Nichols methods are applied for design of speed controller of PM brushless DC motor drive. Both methods give the controller parameters,...
In this paper, a reliable control method is proposed for a position servo system using multiple loops. The position servo system has two minor-loops which are a speed loop and a current loop. If one minor feedback loop fails, such as a case of the speed sensor break down, the position servo system becomes unstable. To cope with this problem, the proposed method uses an equivalent transfer function...
This paper presents a simple prediction based current reference generation method for a four-wire active power filter. In the steady state the current reference is generated according to data collected during the previous period. However, during the transient state of the load the prediction is no longer valid. Thus, in order to maintain the effective harmonic filtering performance a computational...
In this paper, a strategy for compensating reactive and harmonic currents produced by non-linear loads, when being connected to the low-voltage side of the power system, is investigated. The loads in the low-voltage network can be classified, from the harmonics point of view, into a harmonic current producing type, a harmonic voltage producing type and a harmonic sensitive type. In spite of its associated...
This paper proposes a sensorless rotor temperature estimator for small to medium size mains-fed induction machines. With measurements obtained from only current and voltage sensors, the proposed estimator can capture the rotor temperature in an online fashion. First the rotor speed is extracted from the current harmonic spectrum based on the estimated rotor slot and eccentricity harmonic frequencies...
A new, rugged 100 V power MOSFET of the OptiMOStrade 2-family is described. By applying compensation principles, a device technology was developed that combines low on-state resistance RON with outstanding switching properties. The technology also offers a small gate charge QG and a small gate resistance RG. In addition, the internal body diode, when acting as freewheeling diode, reveals a soft reverse-recovery...
This work proposes a system, based on a self-excited induction generator (SEIG) with a shunt electronic converter, to feed isolated three-phase and single-phase linear or nonlinear loads. The electronic converter is composed by a three-phase four-wire shunt active filter and a DC chopper attached to its DC bus. The converter compensates the current harmonics, the reactive power and the load unbalances...
In this paper a discrete-time sliding-mode based controller design for high accuracy motion control systems is presented. The controller is designed for a general SISO system with nonlinearity and external disturbance. Closed-loop behavior of the general system with the proposed control and Lyapunov stability is shown and the error of the closed loop system is proven to be within an o(T2). The proposed...
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