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A new carrier-based predictive current controlled pulse width modulation (PCCPWM) method is proposed to modulate matrix converters. The PCCPWM controller utilizes a discrete-time model to predict the future values of output currents and generates proper duty ratios to minimize the output current errors. The modulation algorithm and the related equations are derived by using average concept over one...
A single-stage three-phase AC-DC converter is presented in this paper. The front semi-stage of the proposed converter, which is operated in discontinuous conduction mode (DCM), is utilized for power factor correction and the rear semi-stage of the proposed converter, which is operated in continuous conduction mode (CCM) at heavy loads and in DCM at light loads, is employed for step-down voltage conversion...
The question of energy savings has been a matter of concern since a long time in the mobile distributed systems and battery-constrained systems. However, for large-scale non-mobile distributed systems, which nowadays reach impressive sizes, the energy dimension (electrical consumption) just starts to be taken into account. In this paper, we present the GREEN-NET framework which is based on 3 main...
Zeta mode three-level AC/AC converter can realize three-level voltage before output filter, which can get a better spectrum and reduce bulk of the filter. Compared with non-isolation and low or middle frequency isolation AC/DC/AC converters, it is single stage. And compared with Buck non-isolation AC/AC converter which can only realize buck output voltage, it can realize buck and boost output voltage...
A method is proposed for reconstructing AC currents with a single DC side current sensor in three-phase AC motor drive system. The method is based on a common-mode voltage (CMV) reduction PWM technique called LuPWM, which eliminates most of the invalid regions for current reconstruction both around zero voltage and near active-vectors. It realizes fixed-point sampling which is favorable for implementation...
This paper describes a 10-bit 40 MS/s low power pipelined analog-to-digital converter (ADC). A novel pre-charged fast power-on switched operational amplifier is used to lower power consumption of the pipelined ADC to 13.82 mW. The ADC is designed in a 1.8 V 1P6M 0.18-mum CMOS process. Simulation results indicate that the ADC exhibits Spurious Free Dynamic Range (SFDR) of 74.19 dB and Signal to Noise...
This research aims to construct sliding mode control (SMC) system that decreases chattering in controlled object of discrete time system. In conventional SMC, chattering has been generated by turbulence's influencing the state, and repeating operation that jumps over switching hyperplane. Then, we thought about switching hyperplane that always moved according to the change in the state. The feature...
For voltage-source inverters, the dead-time necessary to prevent the shoot-through of the inverter-legs results in output voltage distortion. In this paper, the analysis of voltage distortion is investigated with the consideration of the dead-time and the non-ideal characteristics of the switching devices. From the analysis, an accurate dead-time compensation method is proposed. This method is based...
A traffic engineered label switched path (TE-LSP) is usually deployed on an optimally computed path. In complex network scenarios, or when external nodes like path computation elements (PCEs) are solicited in a distributed manner, the already resource hungry task of optimal path computation could take a considerable amount of time during which network resources may fluctuate. This could result in...
Recently, WiBro has been developed to efficiently support broadcasting via wireless network. MBS (multicast broadcast service) based on WiBro has numerous applications including DMB. Since the current MBS implementation uses only common channel which is managed by scheduling, it cannot effectively support many users requesting the service at the same time. This paper proposes a new counting scheme...
In this paper, sliding mode control (SMC) is applied to regulate the dq axis currents of a 6 phase induction machine (6PIM). This strategy presents a good alternative in power electronics for electrical drives because of its dynamic properties and its high robustness. The design of the sliding mode control law, defined from the healthy mode model, is based on the linear feedback with switched gains...
Electric drives may be negatively affected by non-standard conditions in the power network such as voltage unbalance, which may arise in three-phase power networks. The unbalance can be caused by a failure in the network or by unbalanced load in the vicinity of the affected drive. Unsymmetrical voltages at the input of a voltage source inverter cause pulsations in the DC-link voltage when not properly...
Vertical integration is said to provide an advantage over non-integrated firms. Therefore, regulatory agencies are strongly interested in separating former fully integrated monopolies in energy markets. In this paper we analyse whether - besides vertical integration - incumbents experience a first-mover advantage in the sense that customers have to switch from an incumbent's standard contract. Customers...
A new algorithm of tetrahedron determination applied to the SVPWM control of four leg inverters is presented in this work. Indeed during the last years two main families of works were existing under this subject, the first one used the alphabetagamma frame , while, the second one used the abc frame. In this algorithm, it is proposed a new method for the determination of the reference vector location...
In this paper, we study the problem of generating chaotic attractors by using a switching type of piecewise linear controller. A new chaotic system is generated by designing a switching piecewise-linear controller . Some basic dynamical properties, such as Lyapunov exponents, fractal dimension, equilibrium and chaotic dynamical behaviors of the new chaotic system are studied. Furthermore, dynamical...
This paper considers the problem of finding a common linear copositive Lyapunov function for a set of second order systems. Based on mathematical programming, we give a new proof of the result in (O. Mason, 2004). Then we extend this result to a finite number of systems, and a common linear copositive Lyapunov function is obtained.
Green computing is a new paradigm of designing the computer system which considers not only the processing performance but also the energy efficiency. Power management is one of the approaches in green computing to reduce the power consumption in distributed computing system. In this paper, we first propose an optimal power management (OPM) used by a batch scheduler in a server farm. This OPM observes...
Version control systems are essential for co-ordinating work on a software project. A number of open- and closed-source projects are proposing to move, or have already moved, their source code repositories from a centralized version control system (CVCS) to a decentralized version control system (DVCS). In this paper we summarize the differences between a CVCS and a DVCS, and describe some of the...
Design constraints imposed by global interconnect delays as well as limitations in integration of disparate technologies make 3D chip stacks an enticing technology solution for massively integrated electronic systems. The scarcity of vertical interconnects however imposes special constraints on the design of the communication architecture. This article examines the performance and scalability of different...
Model-based design (MBD) involves designing a model of a control system, simulating and debugging it with dedicated tools, and finally generating automatically code corresponding to this model. In the domain of embedded systems, it offers the huge advantage of avoiding the time-consuming and error-prone final coding phase. The main issue raised by MBD is the faithfulness of the generated code with...
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