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In this paper a new algorithm for detection and location of multi defects along a cable section of a network is introduced. These tasks are performed based on the Traveling Wave (TW) components measured at the two accessible cable ends. To reduce the calculation burden, a recursive formulation for obtaining TW components is presented. The algorithm is extended by Mathematical Morphology (MM) which...
This paper focuses on the development of a model for interruptible load (IL) procurements within the operating reserve where energy and reserve are jointly dispatched. In this paper a stochastic mixed-integer linear programming model is utilized. Both spinning reserve and interruptible load are taken into account as the operating reserve services. The characteristics of the procurement of interruptible...
Employing Phasor Measurement Units in wide area monitoring and control of power systems and the availability of phase angles, a new look at the voltage stability indices is performed in this paper. A systematic approach for comparing these indices is presented, where the behavior of different indices to a step load change, for studying long term voltage stability, is compared. This comparison is carried...
This paper covers a comparative study on fuel economy and emissions of a conventional hybrid electric vehicle (HEV) and the UTS plug-in HEV (PHEV). The interaction between the components such as energy storage system, electric machine, power control unit and internal combustion engine of the UTS PHEV are complex in order to optimize the fuel economy and emissions brought by the vehicle. In this work,...
Electricity demand forecasting is known as one of the most important challenges in managing supply and demand of electricity and has been studied from different views. Electrical load forecast might be performed over different time intervals of short, medium and long term. Various techniques have been proposed for short term, medium term or long term load forecasting. In this study we employ Adaptive...
Solar radiation knowledge is important for the solar energy conversion and utilization. In this work, least squares-support vector machine (LS-SVM) algorithms were applied to estimate the yearly and monthly average daily global solar radiation in China using the ordinary meteorological data and geographic parameters. The monthly climatic data from 101 radiation measurement stations were divided into...
The fluctuation of the inlet seed fraction always exists in the MHD facility. The effects of this kind of inlet fluctuation may cause the trouble for the performance of power generators. In this paper a numerical model for nonequilibrium plasma is developed, and a two-dimensional simulation of Closed-Cycle (CC) MHD power generator performance especially with the inlet seed fraction fluctuation has...
The paper presents the design, development and implementation of a Three Phase diode clamped active front-end converter in rectification mode for the power factor control and power quality improvement. Specifically this paper concentrates on the dc link capacitor balancing and maintenance of near to unity power factor of the supply. The paper also proposes an existing and popular mathematical modeling...
Mechanical transmission system is used to transfer energy and motion. Conceptual design of mechanical transmission system is an early stage in the product design process, which has an essential effect on product innovation. This paper is devoted to presenting a systematic approach to conceptual design of automated mechanical transmission system and its realization, based on the functional decomposition...
This paper presents a novel ANN based technique for improving the performance of distance relays against open circuit faults in transmission networks. The results obtained show that a distance relay with the proposed scheme will not only be able to detect the open conductor condition in HVTL but also to locate the place of this fault regardless the value of the pre-fault current loading. Detailed...
In order to copper with the continuing global warming, various innovative plans have been promoted by both the country and also the local levels. However, as the most important local elements, urban and rural areas are always examined in a separate way to find the way to the low-carbon society, especially the low-carbon energy system. In this study, an integrated energy system covering both urban...
This paper introduces a basic architecture of Bit-Watt home system, one target of which is to optimize the energy consumption of home appliances. The Bit-Watt system consists of intelligent home appliances, a home energy server, and hybrid power supplies. We introduce an energy cost model and propose a proactive energy management approach for the home system. The proposed approach applies time-shift...
This paper presents the HF models of multi-winding transformer used in switching power supplies for radar applications. It allows the adaptation of voltage levels for needs and provides galvanic isolation between input and output. Two models of the HF transformer are presented: a simplified model and a model taking into account the coupling of leakage inductors. The accuracy of each model is established...
A distributed power system consisting of multiple subsystems with individual state estimators needs to be globallymonitored using a system-wide state estimation function. To solve this problem, researchers have used several methods which can be categorized into three approaches: integrated state estimation, parallel state estimation and distributed state estimation. In literature, these methods are...
Unified power quality conditioner is a powerful tool to settle the power quality problems. In reason of power devices technology promotion and their cost reduction, it is predicable that UPQC will attain wide spread usage. Therefore its lifetime and efficiency would become important issues. In this paper a control system is developed that devolves compensation of short duration and shallow depth voltage...
This paper proposes a fixed frequency modulation scheme for a three-phase PWM rectifier operating at unity power factor. It provides a constant and reduced switching frequency for all the switches of the rectifier by controlling the occurrence and duration of the zero vector states indirectly. The two legs of the converter are operated in hysteresis current tracking mode and the third leg is controlled...
Shunt active power filter play an important role in reducing harmonic currents and reactive power in power lines, so necessarily it has to be effective and reliable as much as possible. In this paper the power section of power active filter is viewed as analog to digital converter (ADC), then as a result a three-phase shunt active filter with modulator controller which uses Sigma-Delta analog to digital...
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