The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A good methodology flow can improve significantly the time needed to develop an I/O library. It is mandatory that the fastest methodology also gives accurate results. Given the new technology nodes, it is important to re-evaluate all the software characterization formats (NLDM, CCS and ECSM) and see if there is room for improvement. The analysis will be conducted by comparing liberty file data with...
This paper presents discontinuous pulse width modulation (DPWM) scheme for a modular multilevel converter (MMC) to achieve an advanced switching losses reduction. The MMC is considered to be one of the most attractive multilevel topology for high-power applications because of the features of its high power quality, modularity, and availability. However, the MMC has large switching losses because of...
This paper proposes optimal switching period phase-shifted method for slave inverter to reduce grid current ripples in synchronized two parallel three-phase grid-connected voltage-source inverters (VSI). In parallel operation, a 180 degree phase shifted method generally takes of advantage of reducing grid current ripples in same DC-link voltage for each grid-connected VSI. However, in case of unequal...
Train cruising movement simulation module is an important part of high-speed train moving simulation system. According to the actual cruising movement characteristics of high-speed train, it is very important to design high-speed train cruising movement simulation algorithm to improve the calculation accuracy of train moving simulation system. Based on the conditions and the characteristics of high-speed...
This paper tackles the problem of periodic review of perishable inventory of extremely short shelf life characterized by age differentiation. The daily demand of items is highly stochastic which is differentiated by age, that is, the demand on young items is not the same as the demand on older items. This demand pattern can be found in applications such as oncology, transplantation and traumatology...
In this paper, the principle of normalized minimum-sum (NMS) polar decoding process is explored. It is demonstrated that with one properly chosen parameters for NMS algorithm, performances approach to that of the sum-product (SP) algorithm can be achieved. As well, the complexity reduction is realized by calculating a linear function instead of nonlinear function. Simulation results for successive...
As the technology scales toward deeper submicron, system-on-chip designs have migrated from fairly simple single processor and memory designs to relatively complicated systems with higher communication requirements. Network-on-chip architectures emerged as promising solutions for future system-on-chip communication architecture designs. However, the switching and routing algorithm design of network-on-chip...
The description of a research technique of the international economic relations on the example of world model of V. Leontyev of VV is brought, optimizing tasks are formulated, substantiation for carrying out calculations are given.
In this paper we present the modeling and simulation of multi-rotors using Spatial Operator Algebra. We develop two dynamic models one where the speeds are in the inertial frame and another where the speeds are vehicle frame. In both the reference point is the center of mass, but the method applies to any point of the vehicle. Besides gravity, the external forces considered include the effect of the...
Delay Tolerant Networks (DTNs) differ from the traditional Mobile Ad Hoc networks (MANETs) in that DTNs are not always interconnected. The issue of routing data in a DTN is considered here. Many routing protocols exist for DTNs. Some are based on comparing nodes to each other, whereas others focus on the internal properties of the messages they hold. There are wide ranges of protocols, and they perform...
The voltage equation of asynchronous motor was established in synchronous rotating coordinate system. This model was implemented by using the Matrix Concatenation module in Simulink software. Simulation experiments were carried out. The results showed that this modeling method was simple, fast operation and high accuracy.
This paper proposes an improved phase-shifted pulse-width modulation (PS-PWM) method for a three-phase cascaded H-bridge (CBH) multi-level inverter. In the proposed PS-PWM method, the switches at one leg of H-bridge cell (HBC) only operate and the switches at other leg are clamped. Therefore, the number of the multi-carrier signals depending on the voltage level can be reduced in half compared to...
Due to different initial state of charge (SOC) of energy storage system, the SOC of cascaded storage module is unbalanced in microgrid. Many conventional methods realize SOC balance of cascaded storage module based on centralized communication. In this paper, a decentralized SOC balancing method is proposed without any communication. In this scheme, the modified P-f curves are changed by the local...
This paper addresses the harmonic current control for LCL-filtered Voltage-Source Converters (VSCs) connected to ultra-weak (high-impedance) grids. It is shown that the harmonic current controllers tend to be unstable as the Short-Circuit Ratio (SCR) of the system reduces. An active stabilizing control scheme is thus proposed by feeding back the filter capacitor voltage and the converter-side current...
The difficulty of modeling a resonant converter is the fact that, unlike a pulse-width-modulation (PWM) converter, an average concept doesn't work. The only successful equivalent circuit model, proposed by E. Yang, is based on fundamental approximation and harmonic balance theory. However, it is conceptually hard to understand because of an unidentified “equilibrium state.” A resonant converter was...
Overcurrent or overvoltage problems caused by DC line faults endanger the security of modular multilevel converter based high voltage direct current (MMC-HVDC) system. To improve the reliability of fault identification for MMC-HVDC transmission lines, a novel pilot protection scheme based on DC power difference is proposed in this paper. Characteristics of the DC power difference between positive...
Today's trends towards automation and robotics, fueled by the emerging Industry 4.0 paradigm shift, open up many new kinds of control and optimization problems. At the same time, advances in 3D simulation technology lead to ever-improving simulation models and algorithms in various domains, such as multi-body dynamics, kinematics, or sensor simulation. This development can be harnessed for Simulation-...
The vision is considered the most important sense in humans, the visual field may be affected by various diseases or conditions that can even be congenital, resulting in a high percentage of people with visual problems, low vision to blindness. In the majority of cases can be corrected with conventional methods, however, if a suitable control could be prevented and up to early detection of various...
In this paper, we consider the problem of removing outliers from phase measurements in phase of arrival (POA) based localization, applied for the landslide monitoring. Our approach adopts so called cumulative residues and recursively removing outliers. The simulation results show that the proposed method has successfully removed outliers.
In Digital Grid which has been proposed as a new electric power grid, multi-inverters are operated in parallel and it may cause the cross-current among those inverters, since inverters do not have synchronizing mechanism. In this study, the authors propose a method to control the cross-current caused by the difference in switching frequencies of multi-inverters in parallel operation. An indirect hysteresis...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.