Practical Implementation of an Improved Standby Boost Uninterruptible Power Supply
Issue:
Volume 3, Issue 6-3, December 2014
Pages:
1-7
Received:
27 May 2014
Accepted:
16 June 2014
Published:
4 July 2014
Abstract: This paper proposes a single phase pulse-width modulated (PMW) voltage source uninterruptible power supply known as an improved standby boost uninterruptible power supply (ISBUPS) which centers on keeping the output voltage of the inverter system of the UPS at constant voltage of 220V AC and ripple free when utility power supply fails. This concept is achieved by incorporating proportional integral (PI) controller, boost converter and L-C filter at inverter control section. In this research, apart from stabilizing the inverter output voltage of inverter at 220VAC in standby mode, 0.96 modulation index is also realized. The total harmonic distortion of the system is reduced down to 5.05%. This proposed system has its applications at homes, offices and in business centers especially in Nigeria where electrical power instability is high now.
Abstract: This paper proposes a single phase pulse-width modulated (PMW) voltage source uninterruptible power supply known as an improved standby boost uninterruptible power supply (ISBUPS) which centers on keeping the output voltage of the inverter system of the UPS at constant voltage of 220V AC and ripple free when utility power supply fails. This concept...
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A Paraguayan Case Study on the Production of Electricity from Fuel Cells for Distributed Generation
Michel Osvaldo Galeano Espínola
Issue:
Volume 3, Issue 6-3, December 2014
Pages:
8-12
Received:
1 August 2014
Accepted:
22 February 2015
Published:
12 March 2015
Abstract: The result of a preliminary economic evaluation of distributed generation of electricity with a molten carbonate fuel cell (MCFC) in Paraguay is presented in this work. For this purpose, a mathematical model that represents the main technical and economic characteristics involved in the operation of MCFCs was applied. The model is applied in a horizon of 20 years and shows how costs are influenced by the projected energy demand increase of the studied population and by the decrease of MCFC unit cost due to technological advances and mass production. The studied population is Bahía Negra district in the department of Alto Paraguay. The results show that the generation cost of electricity by MCFC is high, US$ 290/MWh and US$ 270/MWh, for conservative and optimistic scenarios, respectively. However, in these situations, the feasibility analysis of electricity supply to isolated communities with low living standards and in developing countries based only on the comparison and quantification in monetary terms is not enough. This is because there are intangible benefits that are difficult to quantify and, therefore, to express in monetary terms. For example, it is very difficult to quantify in monetary terms the improvements in environmental conditions and quality of life of the community. Finally, the use of fuel cells for distributed generation of electricity in rural areas of Paraguay is feasible if the social and environmental aspects are considered, not just economics.
Abstract: The result of a preliminary economic evaluation of distributed generation of electricity with a molten carbonate fuel cell (MCFC) in Paraguay is presented in this work. For this purpose, a mathematical model that represents the main technical and economic characteristics involved in the operation of MCFCs was applied. The model is applied in a hori...
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