Abstract
In Japanese electricity market, Feed in tariff (FIT) contracts for residential solar Photovoltaic systems (PV systems) start to expire from 2019. For the retail electricity providers, those non-FIT PV systems are attractive sources to procure from the viewpoint of decarbonization and cost reduction. However, imbalance risk caused by the system output projection error is the barrier to be overcome. In this study, firstly, a simple projection method of surplus energy from those residential PV systems are developed. Secondly, imbalance management method using remotely controlled residential Heat pump water heater are proposed. Thirdly, the imbalance management system was developed and applied for actual 9 household in Kyusyu area for performance evaluation. Fourthly, based on the empirical research, the operational method for Heat pump water heater was modified so as to improve the performance. Finally, economic impact on retail electricity providers by applying the developed system are evaluated. The result showed that the system can reduce the overall procurement cost through better imbalance risk mitigation and appropriate demand control of the Heat pump water heater.
