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Showing papers on "Stand-alone power system published in 2019"


Journal ArticleDOI
TL;DR: Simulation study and experimental test are carried out to validate the effectiveness of frequency response provided by the multilevel energy storage and can effectively regulate RAPS system frequency while avoiding abrupt and frequent charging/discharging of the LABs and significant mechanical/electromagnetic stress on the WECS.
Abstract: Frequency support from renewable power generators is critical requirement to ensure the frequency stability of remote area power supply (RAPS) systems with high penetration of renewable power generation. However, traditional control strategies and the stochastic nature of wind resource constrain wind energy conversion system (WECS) such as permanent magnet synchronous generator (PMSG) from participating in frequency regulation. This work proposes to integrate hybrid energy storage including ultracapacitors (UCs) and lead-acid batteries (LABs) into a PMSG to provide frequency support. The UCs deal with fast changing frequency by emulating conventional inertial response, whereas the LABs mimic automatic governor response (i.e., primary frequency response). The mechanical power reserved in wind turbine using suboptimal maximum power point tracking strategy is utilized to restore system frequency (i.e., secondary frequency response). Moreover, supplementary control strategies are proposed to enable the UCs and LABs to assist primary frequency response and secondary frequency response, respectively. Simulation study and experimental test are carried out to validate the effectiveness of frequency response provided by the multilevel energy storage. The multilevel energy storage solution can effectively regulate RAPS system frequency while avoiding abrupt and frequent charging/discharging of the LABs and significant mechanical/electromagnetic stress on the WECS.

57 citations


Journal ArticleDOI
TL;DR: In this article, the authors examine policy instruments that aim to decarbonize electricity production by replacing fossil fuel energy with intermittent renewable sources, namely, wind and solar power, and consider a...
Abstract: We examine policy instruments that aim to decarbonize electricity production by replacing fossil fuel energy with intermittent renewable sources, namely, wind and solar power. We consider a...

55 citations


Journal ArticleDOI
TL;DR: In this article, the authors used an eco-efficiency analysis (EEA) framework to explore the environmental and economic performance of the current hybrid RAPS systems in Western Australia, and the results showed that improving the load restriction of diesel engines, installing exhaust gas recirculation on diesel engines and installing rooftop solar PV on the residential houses of the RAPS system could potentially reduce life cycle CO2 emissions by 9% and the life cycle cost by 1%.

23 citations


Proceedings ArticleDOI
22 May 2019
TL;DR: In this paper, the authors considered a low-energy wind and solar stand-alone power system for agricultural consumers, and its structural diagram, magnetic flux density distribution chart, mathematical modelling and the field test results are presented.
Abstract: The article considers a low-energy wind and solar stand-alone power system for agricultural consumers. The wind generator used is a 500 W dual magnetic synchronous generator, and its structural diagram, magnetic flux density distribution chart, mathematical modelling and the field test results are presented. The article also describes a linear drive solar panel tracker. The tracker structure and design and the field test results for a solar collector with the solar tracker are presented. A synchronous generator with a two-circuit magnetic system contains an external and internal circuit on which neodymium magnets, a magnetic core, additional poles are fixed. Between external and internal circuits the generator stator windings are arranged. The body of the synchronous generator, on which the external and internal magnetic circuits are fixed, is made of plastic. The excess energy produced by a synchronous generator with a double-circuit magnetic system is accumulated in the batteries, in case of lack of wind load, simultaneous operation of a synchronous generator with a double-circuit magnetic system and a battery through a power controlled transistor to the inverter is possible. Tracking system of the sun contains the sensor of position of the sun, two DC motors with gearboxes and retractable stocks, allowing to position the solar panels in two planes, horizontally and vertically depending on the position of the sun, allowing to increase the power generation of solar panels compared with the stationary arrangement of 40 %.

1 citations


Journal ArticleDOI
TL;DR: In this paper, a renewable combined heat and power (CHP) system using biogas is proposed as a solution to meet the electrical and thermal loads of a remote area in the Eastern Cape province of South Africa.
Abstract: Most remote locations in Africa are nonelectrified due to the sites' location as opposed to the main utility grids. Studies carried out to assess the possibilities of extending the grids to reach these areas have shown in most cases that the solution is not economic due to the inability of the inhabitants to afford the electricity bills, in addition to the lack of important economic activities. An alternative solution is the use of off-grid power systems. Different configurations of off-grid power systems may be possible depending on the available resources, however, as remote area activities are based on farming and agriculture, organic matters from plants and animals can be used as primary energy to produce biogas and generate electricity and heat. In this study, a renewable combined heat and power (CHP) system using biogas is proposed as a solution to meet the electrical and thermal loads of a remote area in the Eastern Cape province of South Africa. The objective of the study is to assess the potential of implementing a biomass-based combined heat power system in a rural area by considering a total of twenty agricultural households. It is considered that a single household has an average of five species of livestock including cattle, sheep, goats and pigs. The type of biomass used in the study consists of manure released by the selected livestock. A technoeconomic evaluation is carried out using the electrical and thermal load requirement of the twenty households. Sensitivity analyses are carried on evaluating the Net Present Cost and Cost of Energy in case the discount and inflation rates vary. The modelling and simulation is carried using Homer Pro software.

1 citations