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2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
Poor air quality is becoming a growing concern throughout the world as its long-term health and economic impacts are better understood. The World Health Organization considers indoor and outdoor air pollution the single largest environmental health risk increasing the possibility of developing lung and/or heart diseases as well as many other health conditions. Understanding precisely where this air...
This paper describes the comparison results of the service voltage and its variation range in the distribution network of different countries. Also, the maximum voltage drop in consumer's installations in other countries is compared to each other. To do this, the national standards and regulations related to the voltage variation ranges and the voltage drop are studied in this paper. Especially, this...
There is a great deal that concerns international financiers in the potential electricity market in underdeveloped countries such as Iran. Renewable energies like sun and wind are becoming attractive fields of investment in these market since the past decades. There is a good situation for investors in Iran where energy intensity is three times more than the world average. However, this market has...
This paper deals with lightweight building simulation with phase change material on the North and the South walls. Givoni bioclimatic chart is used in order to compare results from study with and without phase change material. The results clearly show that the use of phase change material has a positive effect on inside air temperature thermal comfort was improved.
In high power applications such as static synchronous compensator (STATCOM) used for reactive power compensation, it is essential to reduce semiconductor losses and associated cost to a minimum value while maintaining desired key attributes. This paper presents a new hybrid switching STATCOM that addresses the semiconductor device losses while ensuring the usual STATCOM operating criterion. Design...
Power system stability is a serious concern of power system engineers and utilities especially after the recent occurrences of major events of black outs. Power factor improvement devices such as capacitors, optimally placed in series or shunt in any given network can improve its voltage as well as angular stability. Thermal limits of lines can be observed as the system is visible at all times through...
This paper focuses on the determination of the Channel Frequency Response (CFR) for a length of power cable which is crucial in determining the channel performance. The per-unit-length (PUL) parameters of a power line cable is used to calculate the CFR theoretically. This is verified by real world measurement. A new approach is introduced to model the PUL parameters. This work focus on characterizing...
We propose a digital architecture for selective coordination between low voltage circuit breakers. An Ethernet link is used to interchange telegrams, according to a dedicated protocol, which contain status and alarms, including protection pickup and current direction. Telegrams are sent and received by circuit breakers, which can then enable, delay or block trip according to the received information...
A complex power converter system is realized with only 4H-SiC devices. It is a DC/AC power converter with an isolation of 4kVdc and made by two stages: a DC/DC Phase Shift Full Bridge converter and a DC/AC full bridge inverter. The input voltage is 48Vdc and the output is 132Vrms with a frequency of 50Hz and 400Hz. The DC/DC PSFB is controlled at a frequency of 100kHz with an integrated circuit, whereas...
Global Earth observation for weather forecast and for global environmental monitoring is mainly conducted from space based sensors. The activity of the satellites carrying those instruments is under the risk of impacts from space debris. Protections from hypervelocity impacts can be devised only from debris that are smaller than say 1 cm. For larger sizes the only way to avoid destruction of the spacecraft...
Lightning discharge currents and their derivatives have been measured at instrumented tall towers for a few decades already. Results of those measurements are used for lightning research purposes, modelling of lightning discharges and making improvements in lightning protection. Some of the measured lightning currents are represented in this paper by the multi-peaked analytically extended function...
In this study the watt loss energy measured during varistor conduction at elevated temperature is extrapolated to long-term energy dissipation under standard operating conditions. Artificial degradation tests are conducted on two sets of five varistor samples at the following conditions: 0.85 V1 mA/135°C/96 hours with and without harmonics. Fourier Analysis is applied in order to determine the active...
In this work, ac field and thermal stresses of magnitude and duration 0.76 V1mA/85°C/48 hours is used to implement accelerated degradation on commercially-sourced Zinc oxide (ZnO) varistors. The following parameters are measured and analysed before and after degradation test: the average size of ZnO grains using linear intercept method on Scanning Electron Microscopy (SEM) micrograps, microstructure...
For a multijunction solar cell (MJSC), the current matching in each subcell becomes the key issue to achieve high efficiency. For an intermediate band solar cell (IBSC) on the other hand, which also has a potential of achieving high efficiency, its equivalent circuit is comprised of a series/parallel circuit and thus it operates at a higher current density than a MJSC. Due to this inherent property,...
Organizations are able to better control their energy costs and increase their competitiveness by setting up energy performance actions. Existing energy management standards, such as ISO 50001, often refer to the measurement of energy as an important improvement of energy performance, but do not detail how a measurement and monitoring plan should be implemented in practice. The impact of having an...
Fast development of various types of converters makes their utilization in industry and in domestic installations very common. Due to converters, an earth fault current waveform in modern circuits can be distorted or its frequency can be different than 50/60 Hz. Frequency of earth fault (residual) current influences tripping of residual current devices which are widely used in low voltage systems...
The article presents why energy data management (EDM) is important for telecom operators and how measuring is impacting the business value and balance sheet. Based on the Vodafone EDM use case, we identify the best practices for the enhanced monitoring and control of a large volume of remote sites such as base transceiver stations as well as hybrid energy infrastructure assets such as cooling, DC...
The installed power on the SPIDER and MITICA experiments of the ITER Neutral Beam Test Facility is 13.4 MVA and 83.3 MVA respectively. The paper describes architecture and features of the associated power distribution system, discussing the operational implications of key design choices.
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