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17 results on '"Iwafune, Yumiko"'

2. Energy demand science for a decarbonized society in the context of the residential sector

Author

Shimoda, Yoshiyuki, Yamaguchi, Yohei, Iwafune, Yumiko, Hidaka, Kazuyoshi, Meier, Alan, Yagita, Yoshie, Kawamoto, Hisaki, and Nishikiori, Soichi

Subjects
Engineering, Affordable and Clean Energy, Energy demand science, Residential sector, Decarbonized society, Measurement and analysis, Energy demand model, Influencing factors, Energy
Abstract

To develop a decarbonized society, two contradictory requirements must be met: (1) reducing energy demand and (2) creating flexibility in energy demand in order to respond to fluctuations in renewable electricity generation. To help meet these requirements, conventional energy efficiency studies should be extended to incorporate “energy demand science.” This paper presents a definition of “energy demand science” and then reviews the related history and research questions of energy demand science in the context of the residential sector. It then examines three key areas that must be integrated into the next-generation energy demand science: (1) energy demand measurement with detailed granularity and analysis using cutting-edge technology, (2) energy demand modeling that helps clarify the formation mechanism of energy demand, and (3) identification of the factors that influence people's decision making, which represents typical human-dimension research. Energy demand science consists of technical, human, natural environment, demographic, and land-use dimensions, and their integration is key for the establishment of a decarbonized society.

Published
2020

7. Impact of V2G Ancillary Services on the Spread of Variable Renewable Energy: Evaluation Using Electric Power System Simulation in Japan

Author

Kataoka, Ryosuke, Yamada, Hiroyuki, Ogimoto, Kazuhiko, Iwafune, Yumiko, and Kojima, Yoshiko

Subjects
cost, V2G (vehicle-to-grid), renewable, electric vehicle (EV), environment
Abstract

One barrier to the wider use of variable renewable energy (VRE) is the need for power system stabilization and reliability. In addition to smart charging or shift of energy charge/discharge, the use of electric vehicle (EV) batteries for ancillary services, known as Vehicle-to-Grid (V2G), is expected to solve this problem with its ubiquity and flexibility. Quantitative evaluations of the respective value in each country and region are necessary to encourage the spread of V2G. We modeled the effect of V2G on the integration of VRE, assuming a Japanese power system. Our results show that providing the capacity of load frequency control (LFC) by V2G can contribute to enhance economy, stability and reliability of the power system operation to realize a sustainable society

Published
2020
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12. Analysis of Microgrid Contributing to Hour-ahead market operation through Marginal Day-ahead market Price-Based Demand Response

Author

Ma Tianhu, Iwafune Yumiko, and Baba Jumpei

Subjects
020209 energy, 020208 electrical & electronic engineering, Photovoltaic system, Thermal power station, 02 engineering and technology, Environmental economics, Demand response, Electric power system, Incentive, 0202 electrical engineering, electronic engineering, information engineering, Market price, Electricity market, Business, Microgrid
Abstract

In Japan, 53 GW Photovoltaic (PV) systems will be introduced in future electric power system in 2030 year. It will raise issues of insufficient supply capability and reserve capacity to utility operator to ensure supply-demand balance. On the other hand, Microgrid that located in demand side will be expecting to actively response the incentive signal sent by the utility operator so as to contributing to demand-supply adjustment. In this paper, based on revised IEEJ-EAST-10 Generators simulation model that included of 22GW PV generations and 5GW Microgrids, we analyzed the effect and potential contribution capability of microgrid to electric power system demand-supply adjustment in hour-ahead electricity market through Price-Based Demand Response. Firstly, we analyzed the impact of day-ahead market marginal price on optimal scheduling of Micorgrid. Secondly, we analyzed the impact of optimal scheduling of Micorgrid on Utility operator in Hour-ahead market operation. Lastly, we evaluated the contribution capability of microgrid to electric power system demand-supply adjustment in hour-ahead electricity market that included the improvement of partial-load operation of coal thermal power plant, Utility side load-leveling, and reserve capacity provided by Microgrid.

Published
2017

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