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This paper presents an approach towards using Space Vector Modulation for multi-level converter based on precalculation of switching time for each voltage configuration in the converter using weighted time assignment to sectors. This algorithm minimizes runtime calculation of switching time and its simulation results are presented to validate the effectiveness of the proposed scheme. The concept of...
This paper is concerned with the problem of stabilization for positive switched delay systems. A hysteresis switching law is designed to stabilize positive switched systems with a time delay. On one hand, such switching laws can eliminate the chattering resulting from state-dependent switching laws. On the other hand, a constant time delay may sometimes lead to the instability of positive switched...
A quasi-ARX (quasi-linear ARX) neural network (QARXNN) model is able to demonstrate its ability for identification and prediction highly nonlinear system. The model is simplified by a linear correlation between the input vector and its nonlinear coefficients. The coefficients are used to parameterize the input vector performed by an embedded system called as state dependent parameter estimation (SDPE),...
This paper addresses the leader escort control problem of multi-agent systems and discusses how the agents can be effectively separated into two groups to move symmetrically around their leader. A distributed design is given to escort the moving leader under an undirected switching graph, based on a neighbor-based state-estimation rule to estimate the leader's state and a neighbor-based escort controller...
This paper proposes an efficient neutral point control algorithm for three level T-type inverters. The proposed algorithm helps to get balanced neutral point voltage with high efficiency steady state operation. The proposed controller relies on using the hysteresis control for DC link capacitors' voltage balancing. The proposed algorithm is implemented by adjusting the type of redundant small vectors...
This work proposes an efficient scheme for identification of L2 cache module zone (low level cache) for data migration in Chip Multiprocessors (CMPs), during program execution, exploiting the benefits of Non-Uniform Cache Architecture (NUCA). Selection of an exact cache module for migration is always not realizable. A more efficient scheme can be the prediction of cache zone for migration. The proposed...
We consider downlink transmission in a two-cell network where each base station has multiple antennas and each user has a pattern reconfigurable antenna. Without channel state information at the transmitters, existing approaches do not fully exploit the degrees of freedom (DoF) of the network due to detrimental effects of inter-cell interference and intra-cell interference. In this work, we propose...
Multi-phase motor drives are now a day's considered for numerous applications due to the advantages that they offer when compared to their Three-phase counterparts. Proper modeling of inverters and motors are important in devising an appropriate control algorithm. This paper develops a complete modeling of a five-phase inverter and Five Phase space vector modulation schemes which can be used for Five-Phase...
Last few decades, multilevel converter topologies have gained a considerable attention. The multilevel converter designs promise a lot of advantages in high power applications, over the conventional converter design such as: lower THD (Total Harmonic Distortion) higher operational voltage ranges, lighter and cheaper topologies. However, due to its higher complexity, also the control algorithms are...
This paper investigates the structural R-controllability problem for generalized linear switching systems. Causal manipulations on the bond graph models are carried out in order to determine graphical conditions for structural R-controllability.
This paper introduces a low-power test compression scheme that can also be used in a conventional BIST environment. The key contribution is an observation that simple broadcasting of a constant value to predetermined subsets of scan chains allows visible reductions of both toggling rates and pattern counts provided these subsets can be regrouped when feeding scan chains with either decompressed test...
Energy disaggregation is to discover the energy consumption of individual appliances from their aggregated energy values. To solve the problem, most existing approaches rely on either appliances' signatures or their state transition patterns, both hard to obtain in practice. Aiming at developing a simple, universal model that works without depending on sophisticated machine learning techniques or...
Permanent magnet synchronous motor (PMSM) are favored in traction drives of rail vehicles for their high efficiency of operation. Traction inverters always operate at reduced switching frequency to minimize the losses in semiconductor devices. To restrain the motor current harmonics, off-lined calculated optimal synchronous pulse patterns can be used. This paper presents a closed-loop control of permanent...
A voltage source inverter-fed synchronous magnet synchronous motor (PMSM) produces torque ripple due to application of pulsewidth modulation (PWM) method. Torque ripple is influenced strongly by the PWM strategy. A Hybrid SVPWM (HSVPWM) technique is presented to reduce torque ripple of PMSM. The method employs both conventional sequences and advanced bus-clamping switching sequences, which apply an...
In this paper, a recently proposed approach for modeling switched networks (SNs) and power electronic converters is presented. Actually, typical modelings of SNs such as switched models (SMs) and the modified nodal analysis (MNA) exhibit certain drawbacks for simulating switching. For example, the SMs, which consider the switches to be ideal, require to obtain a set of dynamical models that describes...
AC-AC power converters are becoming essential in most of modern power systems and industrial applications. This conversion is usually done using a traditional converter which consists of a rectifier and an inverter separated by a storage component. During the last two decades, matrix converters gained the researchers attention as an alternative to traditional converters thanks to the advantages they...
Static synchronous compensator (STATCOM) based on three-level neutral point clamped (NPC) converter is presented. A simple equivalent circuit of three-level converter is analyzed to predict the deviation of node voltages, and the capacitor voltage imbalance mechanism of three-level NPC converter is analyzed. An optimization algorithm of space vector pulse width modulation ( SVPWM ) for capacitor voltage...
In the present paper, a three-dimensional space vector PWM (3-D SVPWM) algorithm for multilevel converters with digital signal processing is implemented. This modulation technique uses the minimum number of tetrahedrons inside a cube, where each tetrahedron has four vertices which permit to generate a reference voltage vector. The algorithm uses a maximum of three comparisons to calculate the right...
This paper proposed a novel direct power control (DPC) scheme of a three-phase pulse width-modulated rectifier, which solves the problem that classical DPC can't adjust the active power and reactive power in a balanced way. Compared to the classical DPC, the proposed scheme considers the balance of the active and reactive power. When the difference between the active and reactive power tracking errors...
Controllability of the nine-switch inverter is studied with the switched linear system model. On the basis of analysis results, a novel space vector pulse modulation (SVPWM) strategy is proposed. Compared with the classic SVPWM strategy, the number of operation modes used in the novel modulation strategy is reduced by half, therefore the switching sequence of the vectors can be simplified. In addition,...
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