A study on the contribution to surplus power issue by District Heating and Cooling system considering the initial cost of equipment

摘要

Because of the global warming issue, the attention to renewable energy such as photovoltaic generations has increased. It is assumed that a lot of photovoltaic generations will be installed in the future according to Japanese government plans to install 28GW by 2020 and 53GW by 2030. However, it is expected that, when the load demand is low, surplus power occurs in the power system with a large penetration of photovoltaic generations. This issue is generally called “surplus power issue”. In the previous study, it was shown that the cost increase for absorbing surplus power by the existing DHC is inexpensive when it is assumed that the capacity of the DHC is constant. However, the initial construction cost of equipment must be considered from the viewpoint of the total cost of the DHC. In this paper, the DHC contribution considering the initial cost of equipment is studied.