Entity

Time filter

Source Type


Anzai K.,Chubu Electric Power Co. | Ito H.,Chubu Electric Power Co. | Yatsu M.,Hitachi Ltd. | Hara Y.,Toshiba Corporation | Horii H.,JP Business Service Corporation
17th Power Systems Computation Conference, PSCC 2011 | Year: 2011

This paper describes the method to enhance Total Transfer Capability (TTC) to the maximum level by combining new Special Protection Scheme (SPS) and STATCOM. In this method, new SPS carries out generator shedding and/or switching control of shunt capacitors and reactors, and STATCOM maintains bus voltage autonomously. To evaluate the effect of its combination control, the verification technique using Real-Time Digital Simulator (RTDS™) was developed. Through the verification test, we confirmed not only that the SPS algorithm itself was valid but also that the verification technique was flexible and accurate. Source


Udagawa Y.,University of Tokyo | Udagawa Y.,Kozo Keikaku Eng. Inc. | Ogimoto K.,University of Tokyo | Oozeki T.,Japan National Institute of Advanced Industrial Science and Technology | And 3 more authors.
IEEJ Transactions on Power and Energy | Year: 2016

We have developed a unit commitment (UC) model which can consider the confidence intervals of photovoltaics (PV) forecast data. We also analyzed supply-demand balance for the Tokyo Electric Power Company area with highly penetrated variable renewable energy sources in 2030. For 2030, 53 GW of installed PV capacity in Japan (17.5 GW in Tokyo area) was assumed. The case study was carried out to investigate the effect of the UC considering forecast error on day ahead supply-demand balance. As a result, the number of operating thermal power plants increased and the rate of operation of coal-fired power plants decreased to reserve the Load-Frequency Control capacity whose amount increased due to highly penetrated PV. Pumped storage plants stored water in the daytime, when the power of PV is peak, not in midnight to increase the amount of electric load and the operation rate of thermal power plants. Therefore broaden confidence intervals or increasing the amount of forecast errors considered in UC raised the expected operational cost. © 2016 The Institute of Electrical Engineers of Japan. Source


Ogimoto K.,University of Tokyo | Kataoka K.,University of Tokyo | Ikegami T.,University of Tokyo | Nonaka S.,Electric Power Development Co. | And 2 more authors.
Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) | Year: 2014

Under the anticipated high penetration of variable renewable energy generation such as photovoltaics and higher share of nuclear generation, the issue of supply-demand balancing capability should be evaluated and fixed in a future power system. Improvement of existing balancing measures and new technologies such as demand activation and energy storage are expected to solve the issue. In this situation, a long-range power system supply-demand analysis should have the capability to evaluate the balancing capability and balancing countermeasures. This paper presents a new analysis methodology of activated demand model and evaluation of supply-demand balancing capability for a long-range power system demand-supply analysis model, ESPRIT. Model analysis was made to verify the new methodology of the tool including day-ahead scheduling of a heat pump water heater, an EV/PHEV, and a battery. © 2013 Wiley Periodicals, Inc. Source


Ogimoto K.,Tokyo University of Science | Kataoka K.,Tokyo University of Science | Ikegami T.,Tokyo University of Science | Nonaka S.,Electric Power Development Co. | And 2 more authors.
IEEJ Transactions on Electronics, Information and Systems | Year: 2012

Under the anticipated high penetration of variable renewable energy generation such as photovoltaics and higher share of nuclear generation, the issue of supply-demand balancing capability should be evaluated and fixed in a future power system. Improvement of existing balancing measures and new technologies such as demand activation and energy storage are expected to solve the issue. Under the situation, a long-range power system supply-demand analysis should have the capability to evaluate the balancing capability and balancing counter measures. This paper presents a new analysis methodology of activated demand model and evaluation of supply-demand balancing capability for a long-range power system demand-supply analysis model, ESPRIT. Model analysis was made to verify the new methodology of the tool including day-ahead scheduling of a heat pump water heater, an EV/PHEV and a battery. © 2012 The Institute of Electrical Engineers of Japan. Source

Discover hidden collaborations