抄録
This study investigated effects of variable engine speeds operation of gas engines in the energy network. The operation of variable engine speeds increases the system efficiency because the efficiency of gas engines increases in case the output of gas engines is small. In this study, the operation of gas engines was examined by a simulation. This simulation was subject to two types of engines: naturally aspirated gas engines and turbocharged gas engines. This operation changes engine speeds by the use of the output of renewable energy. The output of the renewable energy was substituted for sine waves. The result of this study shows that a rise of efficiency by variable engine speeds is relevant to the rated power of gas engines or the frequency and the amplitude of natural energy. A performance of the gas engine to suppress the fluctuations is irrelevant to the sampling span of calculation the engine speeds. On the other hands, the algorithm of this operation requires improvements.
