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In the control of 400Hz power inverter systems, a new method based on Hilbert transform and DQ transform is proposed. The αβ coordinate is structured according to actual measured voltage and its Hilbert transform. Then the DC quantities under the rotating coordinate is obtained by the DQ transform, followed which the double closed loop control model can be structured. Compared with the conventional...
For model-based predictive control methods it is essential to predict the reaction of the whole system. Sampling of the converter-output-voltages needs unreasonably high sampling rates and is generally avoided. In consequence the converter behavior itself becomes a part of the model. This paper provides a theoretical description of the most relevant effects and gives guidelines for modeling the converter...
The article deals with a general simulation model which has been created to analyse capacity of single-lane roundabouts. The simulation model is created in Witness and all input data that must be provided by users are defined via a web application which has been programmed to communicate with the general simulation model. The web application also presents some results of simulation experiments; the...
Reliable, ad hoc communication among multiple users is a crucial objective in complex tactical scenarios. A major challenge is that synchronization mechanisms (such as GPS) are intermittent and fixed centralized coordinators (e.g., base stations) are infeasible. Classical approaches to multiuser communications relying on tight time synchronization and/or power control are impractical in such scenarios...
This paper analyzes and compares the performance of discrete time series power smoothing techniques utilized with an energy storage system in Mea Sariang micro grid system in Thailand to mitigate PV power fluctuation. A new smoothing technique so-called “Adaptive enhanced linear exponential smoothing (AELES)” is studied and compared with other techniques. PowerFactory-DigSILENT is employed to verify...
The network selection problem in a heterogeneous network environment is studied in the paper. A 3-Param network selection algorithm for CR terminals is proposed. Both the factors that are sensed by the CR terminals and the factors that cannot be gained beforehand are taken into account in the algorithm. Through the evaluation of the primary networks integrating these factors, the algorithm will make...
Vedic mathematics is a system of ancient Indian mathematics, which has a unique technique of solutions based on only 16 sutras or formulae. This technique is very useful for performing tedious mathematical operations at a very fast rate. Motivated by this ancient mathematical system, a high speed low power 8-bit digital multiplier has been proposed in this paper based on Vedic multiplication algorithms...
The future smart power grid will consist of an unlimited number of smart devices that communicate with control units to maintain the grid's sustainability, efficiency, and balancing. In order to build and verify such controllers over a large grid, a scalable simulation environment is needed. This paper presents an open source smart grid simulator (SGSim). The simulator is based on open source SystemC...
The Prophet routing algorithm is a multi-copy algorithm which is based on historical information and transitive probability, which selects the relay node with a high probability to encounter the destination node. However, the selection of a relay node does not consider the current congestion level of node. Even if the current relay node has a high delivery probability to the destination node, it may...
A precise timing system that consists of two delay-locked loops (DLLs) is proposed to align the sampling phases of the time-interleaved ADC (TI-ADC) with the front-end Sample and Hold (S/H) clock. DLL1 using bang-bang phase detector (PD) handles the 1 GHz system clock and DLL2 produces 32 phases to generate the non-overlapped clock in the followed 4 pipeline ADCs. A new self-calibration scheme in...
The new type of the mobile Ad-hoc network, which is called Vehicular Ad-hoc Network (VANET) is creating a rich environment for research. It considered being one of the projects of the Internet of Things (IoT). IoT can be utilized in employing VANET technology to alleviate roads congestion in real time. It has a great impact on the society in general such as to reduce travel time, minimize the fuel...
An angular distribution of received signals has a significant impact on their spectral and correlational properties. Most of angular dispersion models do not consider antenna patterns. The developed procedure for determining the propagation path parameters enables a wide range of assessment of the impact of the propagation environment on the received signal properties. In contrast to the other models,...
This paper presents a novel memory cell design as a variant of Lior Atias' 13T cell (mentioned as LA13T cell in this paper) for low-voltage operation and ultra-low power space applications. Using C-element as a replacement of dual-driven inverters in the LA13T cell, our proposed radiation hardened by design memory cell (referred to as RHD13T) can effectively block the unwanted paths from Vdd to Gnd...
A mathematical simulation has been performed to investigate the energetic, combustion and environmental behavior of a mono cylinder, water cooled, four stroke DI diesel engine fuelled with diesel, diesel-ethanol (15% by volume) and diesel-methanol (15% by volume) blends. The results show that alcohol blending to diesel reduces the emissions of NOx, smoke opacity, specific PM and specific CO2. From...
This paper presents a hybrid Simulation based Optimization (SbO) approach to solve job shop scheduling problems. SbO structure for classical job shop scheduling introduced by [6] is extended for flexible job shop scheduling problem (FJSSP). Performance of SbO is bench-marked in terms of number of decision variables, constraints, objective value and computational time against various Mixed Integer...
Supporting random access of a large number of devices in a short time period is an enormous challenge in machine-to-machine (M2M) communications. In this paper, we propose a dynamic allocation scheme of random access channel (RACH) resource for clustered machine-to-machine (M2M) communications, in which delay-sensitive devices coexist with delay-tolerant ones. Since delay-sensitive devices share random...
Adders forms a major part in various arithmetic logical operations. Parallel Prefix Adder have been built up as the most essential and efficient circuit for binary addition. Their Particular structure and execution performance are very attractive for VLSI implementation. In these papers, we describe the design and performance of the Kogge Stone Parallel Prefix Adders and implemented using different...
Floating-point arithmetic plays major role in computer systems. Many of the digital signal processing applications use floating-point algorithms for execution of the floating-point computations and every operating system is answerable practically for floating-point special cases like underflow and overflow. The single precision floating point arithmetic operations are multiplication, division, addition...
Increasing demand of multiple functions in a single device or with smaller area leads to more market for devices with System on Chip (SOC). An SOC have multiple Intellectual Properties (IPs) such as Processors, memory, peripherals etcetera on a single chip. These IPs need to have an efficient bus architecture for the communication purpose which further decides the device performance. The most used...
Femtocaching is an effective and low-cost way to address the explosively increased wireless traffic demand driven by video-on-demand (VoD) streaming. Most existing caching policies are optimized for file downloading service, which are not necessarily optimal for the quality of experience of users requesting VoD service. In this paper, the caching policy for VoD service is investigated, where the adaptation...
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