Abstract
This study investigates the additional installation of a high-speed diesel generator to independent microgrids (MG) such as remote islands where relatively efficient medium-speed diesel generators (DGs) are mainly used. While small-sized and lightweight, high-speed DGs are not widely spread for continuous usage because their efficiency is lower than that of the medium-speed DGs. The objective of this study is to evaluate the performance of the new method of load sharing optimization to improve the economy by interconnecting a high-speed DG to an independent MG where the medium-speed DGs are operated. The study investigates the effect of operation cost reduction by installing the new load sharing method of operation following the load sharing pattern derived by the mixed-integer programming. As a result of this study, there was some effect to installing a high-speed DG operated by the conventional method. In addition, by adding the new method of load sharing with optimization, the economic effect became even higher.
Highlights
Case 0 provides the reference result for the operation of five medium-speed diesel generators (DGs) corresponding to the assumed demand at the lowest cost in a conventional way
DG can be operated in the higher efficiency range even when the required output capacity is small
The reason is that the new method is performed so that the load factor of the high-speed DG shall be suppressed to operate the medium-speed
Summary
The small-scale independent MGs assumed in this study shall operate under the following conditions: Located in remote areas such as remote islands; The power demand is dominated by consumer use, and large-scale consumers such as the manufacturing industry shall not be there; Not connected to other grids, and power is not supplied to nor received from outside; Multiple medium-speed generators of several hundred to 2000 kW supply power are used; The operation of the generator is controlled to minimize the sum of fuel and maintenance costs; The unplanned withdrawal due to unit failure, etc., shall be taken into account for stable power supply
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