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Supply adequacy assessment of an islanded micro-grid

Bista, Samir (2019) Supply adequacy assessment of an islanded micro-grid. Honours thesis, Murdoch University.

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In the past 50 decades, our world has gone through many advancements in technology that once was merely a thought. Electricity and its accessibility are one of such advancement of science that has been most beneficial for the people. In present we are utilizing this energy at the maximum rate for our convenience at the lowest available cost since it is produced in abundant using different available methods. However, for various reasons like environmental and economical, remote areas are still deprived of its accessibility. Micro-grid with the ability to operate in both mode, namely on-grid and off-grid (islanded) has proven to be one of the most significant breakthroughs that have changed the paradigm of the electrical world.

When electricity cannot reach a particular area, the plausible option is to generate energy by using local renewable resources like solar and wind through a photovoltaic system and Wind turbine. Micro hydropower plant construction is another option if hydropower is available in the place. However, it is not present in all areas. Micro-grid, with the integration of PV and WTG, has to operate in an islanded mode in such circumstances. However, the power generated from MG is highly variant, and there are probabilities that this power is insufficient at times to supply the required load. Energy storage system and diesel generators are therefore added to the system to withstand such distortion of power imbalance.

In this thesis, a study is presented in different cases representing the condition of supply-adequacy of a power system with islanded micro-grid. Usually, in such system, energy storage device and the diesel generator are added at the end when diligent studies have been conducted on power generation from renewable sources and load demand, and its imbalance. But we have initiated the study with the biggest diesel generator as the only part of the micro-grid source. For a single day operation, such a system is efficient and reliable, but for the long run, it could be immensely unreliable and expensive. Lifecycle cost and levelized cost of energy have been used to investigate the financial parameter relating the system, likewise, expected energy not supplied and loss of load expectation is used as reliability indices to assess the reliability of the system. ETAP has been used as an optimization tool to validate and calculate the parameters for the matter. As per the cases PV system, WTG and storage system has been integrated into the initial system, and their capacity has been increased for every case. The effect of this integration on cost and reliability has been assessed and compared to the initial state of operation.

The research work has outlined the merits of minimizing the use of Diesel generator for optimal saving and reliability operation.

Item Type: Thesis (Honours)
Murdoch Affiliation(s): Engineering and Energy
Supervisor(s): Shahnia, Farhad
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