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A Stirling engine (SEG) using woody biomass is a power generation system that can reduce greenhouse gas discharge. However, improvement of generation efficiency and development of a product are required strongly. In this paper, the energy flow is investigated in experimenting in Test SEG. These results are installed into the energy demand pattern of a cold region houses with much heat demand, and the amount of fuel consumption, power generation efficiency, and a greenhouse gas amount of emission are investigated. Operations of the proposed system are SEG base-load operation and SEG power-load-following operation. Moreover, when there is less exhaust heat of the SEG than a heat demand amount, electric heat pump is operated. From analysis results, the energy cost, the greenhouse gas emission characteristic, the auxiliary heat source, and the operation plan of a heat storage tank due to the conventional method and the proposed system are described. It is thought that greenhouse gas and the energy cost of the SEG cogeneration made to follow power load are advantageous compared with the SEG base-load operation. However, it turned out that improvement in the speed of the load response characteristic of the SEG is required as a future subject.

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The combustion exhaust heat of woody biomass engine using Stirling cycle is high temperature. This exhaust heat is used for the city gas reforming reaction of a proton exchange membrane fuel cell (PEM-FC) system. The woody biomass engine generator has the characteristic that the greenhouse gas amount of emission with power generation is greatly reducible. In this paper, the micro grid system that introduces PEM-FC / woody biomass engine hybrid cogeneration (PWHC) is proposed. It depends on the dynamic characteristics of the grid for the power quality at the time of load fluctuation being added to the micro grid. Especially, the dynamic characteristics of the independent micro grid are important on security of power quality. So, in this paper, the response characteristic of PEM-FC and woody biomass engine was investigated by the experiment and the numerical analysis. Furthermore, the response characteristic of the PWHC independent micro grid including auxiliary machinery was investigated by the numerical simulation. Moreover, an improvement of dynamic characteristics is proposed using the method of adding proportional-plus-integral control to PWHC. If woody biomass engine is introduced into a house, 10.2s will be required to stabilize power quality at the maximum. On the other hand, when woody biomass engine corresponds to a base load and PEM-FC corresponds to the load exceeding the base load, settling time is less than 1.6 s. In this study, relation between the system configuration of the PWHC micro grid and the dynamic characteristics of the power was clarified.

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