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This paper presents a modified small-signal model of a voltage source inverter (VSI) that captures model nonlinearities such as dead time and modulation effects that were not presented in the literature. Previous research has concentrated on developing compensation methods for these types of phenomena in a switching model, but none actually derived an analytical model that can predict them. In this...
Assuring continuity operating of induction machine drives is crucial in the most of applications. Thanks to the number of their output voltages, and the extra degrees of freedom they offer, multilevel inverters have been adopted in many applications. In this paper, a new fault tolerant SVM strategy for induction machine drives based on a 3 level NPC inverter is proposed. It insures a continuous operation...
This paper explores the possibility of connecting two Wind Turbine Generators (WTG) to the grid using a single three level inverter. In the proposed system the rectified output of one WTG is connected across the upper dc-link capacitor of a standard diode clamped three level inverter. Similarly the rectified output of the other WTG is connected across the lower capacitor. This particular combination...
The purpose of this paper is to obtain the high performance modulation that combines all features in one: the power efficiency, the robustness to switching disturbances and the currents balancing under an unbalanced load. Due to the high power efficiency, this type of modulation is very attractive for high dynamic applications such as electrical vehicles. The performance efficiency of the proposed...
A simple algorithm has been developed to control small and large multilevel inverters using Space Vector Modulation. It looks for a suitable hexagon near the reference voltage rather than the usual three nearest vectors. Then, switching vectors and their duty cycles are computed using straightforward equations, independent of the number of levels and easy to use in digital microprocessors. Several...
Recently, nine-switch inverter was presented as a dual output inverter. Two constant frequency (CF) and different frequency (DF) modes are defined for nine-switch inverter. However CF mode is more interesting because of lower inverter ratings. Several switching methods have been presented for nine switch converter. A space vector modulation algorithm has already been proposed by authors for DF mode...
Dual two-level inverter topology is a simple structure able to produce multilevel output voltage waveforms equivalent to a 3-level inverter. Its modular structure consists of two standard two-level three-phase voltage source inverters (VSI) supplied by two dc supplies. In case of two separate dc supplies an independent modulation of the two inverters can provide arbitrary power sharing between inverters...
In the paper a modeling of a current source inverter (CSI) is described. The space vector modulation strategy applied for the CSI is analyzed in detail. The harmonic performance of CSI is investigated in the paper. The work is demonstrated by simulation results.
This paper presents a novel space-vector current-control strategy for three-phase neutral-point (NP)-clamped inverters. The main task of this control technique is to force the actual current vector to reach the reference current vector. This original strategy consists in defining three circular hysteresis bands around the error vector. Then, according to the location of this error vector, a selection...
Modulation and control of a cascade multilevel inverter, which has a high potential in future wind generation applications, are presented. The inverter is a combination of a high power, three level ??bulk inverter?? and a low power ??conditioning inverter??. To minimize switching losses, the bulk inverter operates at a low frequency producing square wave outputs while high frequency conditioning inverter...
In this paper, a constrained optimization based approach is proposed for the control of inverter-fed induction motors. This approach has many distinguished features: the measurements are motor velocity and currents, the tracking of torque command is optimized, the switching signal of inverter is determined directly from the feedback signals. This approach may be viewed as an improved SVM (space vector...
Unless over modulation is adopted, utilization of DC bus of the Modified Space Vector Modulation (MSVM) is a drawback that has severely limited the applicability of this modulation technique. This paper presents some solutions that, looking for a good compromise between increasing the use of DC bus and reducing common mode currents, allow to apply MSVM to most electrical drives on the market. Furthermore,...
Since late 1990s multiphase drives have become a serious alternative to three-phase drives in some particular applications such as electric ship propulsion, locomotive traction, electric vehicles and high power industrial applications. Nowadays the research activity is focused on the development of control strategies that can exploit the degrees of freedom that exist in multiphase machines. As known,...
In this paper the direct torque control (DTC) of the induction motor fed by four switch three phase inverter (FSTPI) is investigated. A modified space vector modulation (SVM) approach with optimal voltage vector sequence is proposed to compensate the effect of DC-link voltage variations caused by circulating phase current through the capacitor bank. SVM-DTC scheme of FSTPI fed induction motor is based...
A graphical method, easy to understand and easy to implement, has been developed for two-level and multi-level space vector modulation. Switching sequences can be computed with no need of solving neither multi-variable inverse problems nor expensive trigonometric functions. Proposed method has been validated through simulations and physical implementations.
The paper presents a comparative study of three different 3D-SVM techniques for the control of flying-capacitor multi-level inverters under both balanced and unbalanced operating conditions. Simulation results show that Direct 3D-SVM is the most efficient in computational effort. Application of this scheme to a three-level FCMI is simulated using the Alternative Transients Program (ATP). Output performance...
One of the desirable properties of inverters in three-phase systems is the ability to feed unbalanced/non-linear loads with voltage and frequency nominal values. Therefore, three-leg four-wire inverters are expected to play an essential role in future power systems because of their ability to handle the neutral current caused by unbalanced or non-linear loads. This paper introduces an original control...
Multilevel inverters are increasingly becoming an excellent substitution of conventional two-level inverters owing to their superior capability, especially in high-power medium voltage applications. In both types, SVM (Space Vector Modulation) is mostly employed due to its superiority. However the complexity of normal SVM increases sharply with the increased number of level and/or phase of inverters...
This paper searches for the best possible switching sequence in a multilevel multi-phase inverter that gives the lowest amount of voltage harmonics. A modified discrete particle swarm (MDPSO) algorithm is used in an attempt to find the optimal space vector modulation switching sequence that results in the lowest voltage THD. As with typical PSO cognitive and social parameters are used to guide the...
A high performance modulation technique for dual cascaded inverter is presented in this paper. It allows to optimize the converter performances in terms of power losses and harmonic content. A numerical analysis and an experimental implementation on a laboratory prototype fully confirm the validity of the proposed modulation technique.
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