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Microturbines / 1.1 Background of Project

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Microturbines / 1.1 Background of Project ( microturbines-11-background-project )

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microturbine which has a generator and turbine mounted on different shaft. The most common type used is the single shaft microturbine since it has less moving parts and requires less maintenance [6]. A single shaft microturbine is a high-speed rotating machine with the output power of up to a few hundreds of kilowatts and the output frequency of higher than 50 or 60 Hz [7]. It has a rotor spins on a thin film of pressured air rather than oil inside its bearings. A high speed generator is integrated to its shaft as well as a recuperator. The compressor and turbine are design to shape the airflow to go through the combustion chamber and exhaust the hot gas at optimal pressure [2]. Since a single shaft microturbine generates power at a very high frequency, the power needs to be converted to a normal frequency AC voltage which is 50 or 60 Hz. Therefore, the connection of a microturbine to a distribution system requires the use of power converter consisting of a rectifier and an inverter. The power converter provides conversion of frequency and control of the output voltage of the microturbine generation system. 1.2 Problem Statement The use of power converters in a microturbine generation system however is known to produce harmonics. Once the harmonic current is injected into distribution system, it gives a negative impact to the power quality of the system. The presence of harmonics in distribution system results in losses in power transmission lines and transformers, improper working of power metering devices, and de-rating of distribution equipment. Therefore, it is necessary to use effective harmonic reduction facilities in order to minimize the negative effects of harmonic problem on the distribution system. The harmonic problem caused by microturbine can be partially solved with the use of low pass passive filter. Passive filters are tuned to block a specific 2

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