WEBREVIEW

Joint Market Clearing of Energy and Demand Response Offers ConsideringVoltage Dependent Load Models

Bijwe P. R., Abhyankar, Reddy A. R., Surender S. — 2016-01-06T12:50:20Z

This paper presents a new multi-objective day-ahead market clearing (DAMC) mechanism with demand-side reserves/demand response offers, considering realistic voltage dependent load modeling. The paper proposes objectives such as Social Welfare Maximization (SWM) including demandside reserves, and Load Served Error (LSE) minimization. In this paper, energy and demandsidereserves are cleared simultaneously through co-optimization process. The paper clearly brings out the unsuitability of (...)

- Issue 04 / Spectral response, Demand elasticity, Electricity markets, Load modeling, Multi-objective optimization

Implantation of the scalar control for theopen-end winding induction machine On FPGA Spartan 3E

Abdelmonoem Nayli, Ben Ammar Faouzi, Guizani Sami — 2016-01-06T10:36:49Z

In this paper, the authors propose the implantation of the scalar control for controlling the open-end winding induction machine on FPGA. The scalar control is simulated in matlab Simulink environment using a Xilinx System Generator. This control is implemented in a Xilinx Spartan 3E FPGA board. It is experimentally verified by the visualization of command signals for the switches of the (...)

- Issue 04 / Open-end winding induction machine, Scalar control, Field Programmable Gate Arrays, Xilinx System Generator

Development of PEF source in Nanosecond range for Food Sterilization

Krishnaveni Rajini S., Rajesh Rangarajan, Veeraraghavalu — 2016-01-06T10:13:18Z

Pulsed Electric Field [PEF] food processing technology becomes more attractive, alternative to thermal food processing technologies. Usually the high voltage pulses are generated using conventional pulse generators based on Marx cells, Spark gaps, Electrostatic filters to produce the necessary high electric filed intensity. The voltage and current are limited due to the classical switches used in the conventional generators. The switching speed and slow response of such devices increase the complexity of the control and driver circuits and also the space requirement of the conventional generators. The drawbacks of pulse generators are overcome by
the advanced semiconductor devices, such as power MOSFETs and are becoming most suitable for high speed switching high voltage pulse generators. The modern semiconductor devices are more reliable to handle high voltages and currents when implemented in typical circuits and reduces the bulkiness of the High Voltage Pulse Generator [HVPG]. This paper proposes the developments in HVPG using modern semiconductor devices. The energy efficiency can be improved by minimizing the losses during food process and it can be achieved by reducing the pulse width using modern semiconductors. The proposed generators are capable of producing
high voltage sub-microseconds pulses in the range of 100ns to few microseconds.

Improve Dual Axis Solar Tracker Algorithm based on Sunrise and Sunset Position

Kamshory Nazir, Hadi Muhammad, Refdinal Syafii — 2016-01-06T10:04:24Z

This paper presents sensorless dual axis solar trackers based on sun position using sunrise and sunset database. The database created from exact calculation of solar azimuth and elevation based on Terrestrial Dynamical Time (TDT)system with parameters input : local date, time, geographic location, altitude and timezone. By using linear interpolation the sun position in direction of a and b angles for other time can be obtained during a day. The solar panel move based on sun position in direction of a and b angles. The prototype solar tracker consists of digital electronics circuit and mechanical construction has been functioning as expected, especially for small-sized of solar panel. The measurement of the electrical power output of solar power between a flat position compared to the upright position of sunlight has resulted in a
greater power. For seven hours energy captured by flat posistion was 166.4 Watthour. However by used solar tracker increased to 225.05 Watthour. Thus the solar tracker algorithm has increased output power of Solar Power Generation and it's efficiency 26 %. This technique independent from weather conditions, although cloudy, panel position remains consistent with the maximum illumination when the weather is sunny back later. By this way, the solar panel always absorbs maximum sunlight as well as generate maximum electricity.

Simulation of Corona Discharge in DC Electrostatic Precipitator

Ahmed Kasdi, Kasdi Ahmed, Yala Hakim, Zebboudj Youcef — 2016-01-05T08:49:43Z

The stable positive DC corona discharge in atmospheric air under a wire-to-cylinder system is analyzed in this paper. An iterative finite element technique is developed to obtain a general solution of the governing equations of the coupled space-charge and electric field problem. The technique is to use the finite-element method (FEM) to solve Poisson's equation and the method of characteristics (MOC) to find the charge density from a current-continuity relation. Besides, the corona ionized (...)

- Issue 04 / Finite element method, Electrostatic Precipitator, corona discharge, space charge, Ionized field.

Robust Optimal Control of Chaos in Permanent Magnet Synchronous Motor with Unknown Parameters

Chuansheng Tang, Hongwei Liu, Yuehong Dai — 2016-01-05T08:36:09Z

This paper focuses on the problem of chaos suppression in permanent magnet synchronous motors (PMSM) with uncertain parameters. Firstly, the chaotic characterizations are analyzed, including bifurcation diagram, chaotic attractor, Lyapunov exponents, and power spectrum. Then, by using robust optimal control approach, a simple linear feedback controller is designed to make the system states stable. And the control gains can be obtained from a linear matrix inequality (LMI), which can be (...)

- Issue 04 / Permanent magnet synchronous motor (PMSM), Robust optimal control, linear matrix, unknown parameters

Fuzzy Logic Controlled DC-DC Converter Based Dynamic Voltage Restorer

Inci Mustafa, Tugçe Demirdelen, Tümay Mehmet — 2016-01-04T10:02:11Z

This paper presents fuzzy logic controlled dc-dc boost converter based Dynamic Voltage Restorer (DVR) to compensate severe voltage sag problems in an electrical system. DVR absorbs real power from battery to compensate voltage sags in the system. This condition causes reduction in voltage magnitude of dc-link capacitor. Additionally, DVR requires large dc capacitors to compensate long and severe voltage sags in the system. In this study, dc-dc boost converter is connected to DVR for keeping dc link voltage constant. For this propose, a control algorithm based on Fuzzy Logic (FL) control is developed for dc-dc boost converter. The main contribution of this study is that Fuzzy Logic (FL) is firstly used to generate reference signal for PWM signals of dc-dc converter applied in DVR. FL is a very flexible controller which keeps
the dc link voltage constant during voltage sag. The performance results of proposed study are verified with PSCAD/EMDTC.

Abnormal gait detection using Hexagonal method on Model based Front view model

Nooritawati Md.Tahir, Puad Ahmad Ismail — 2015-12-30T10:05:52Z

Gait abnormality recognition would be very useful in medical monitoring and surveillance system. In this research, analysis of front view human gait silhouette had been done to investigate the possibility of the method in recognizing abnormality on proposed model-based approach. The model based which utilised hexagonal theorem as feature extraction method is used to produce the vertical angles of both hip and knee for 70 image sequences as feature vectors for both legs for one complete cycle sequences. Consequently, a total of 280 features generated based on four parameters from the lower limb of human body for gait abnormality purpose. Further, the gait features extracted from different gait pattern namely as normal, drunken, dragging and tiptoed is classified as normal or abnormal using ANN and KNN. Improvement findings of classification result for before and after normalisation confirmed that the proposed method suited to be utilized as gait abnormality recognition based on human gait
pattern

Improving Transmission Rate with Efficient Bandwidth by using Diversity Technique for MIMOOFDMA Resource Allocation

2015-12-30T10:03:55Z

MIMO-OFDMA (Multiple Input Multiple Output-Orthogonal Frequency Division Multiple
Access) resource allocation is studied in this paper. The considered problem is to provide eachuser with more data rates in wireless communication system by using the suitable value of bandwidth. The objective of this research is to focus on how to improve the data rate by using efficient bandwidth in MIMO-OFDMA system. The different diversity techniques are also applied to observe which technique is the best (...)

- Issue 02 / Multiple Input Multiple Output-Orthogonal Frequency Division Multiple Access (MIMOOFDMA, Resource Allocation, Diversity Technique, Transmission Rate, Bandwidth

Voltage Unbalance in Low Voltage Networks with Single-phase and Three-phase Micro-Generation and Loads

Ferreira de Jesus J.M., Marco Silva, Rui Castro — 2015-12-29T07:29:06Z

The incorporation of clean energy sources in the power system is a topic of discussion almost everywhere. After the “Wind (farms) of change”, small, dispersed, urban photovoltaic (PV) generators are being installed in the roofs of the buildings,
connected to the local Low Voltage (LV) grid. A boost in this type of renewable micro generation is expected in the near future. Due to the domestic loads, LV grids are inherently unbalanced, its analysis requiring the use of three-phase load flow
methods. This same methodology is used in this paper to assess the problem of the concurrent unbalanced generation and load and to cope with the presence of both single and three-phase equipment in the same grid. A review of existent models for
three-phase equipment is performed. The issue of modelling three-phase loads (isolated star and delta connected) and singlephase PV generators and associated power electronics is given special attention. Finally, a case-study is presented, enabling to draw some conclusions regarding the impacts on the Medium Voltage (MV) grid and the behaviour of the system facing different climacteric conditions.