IEEJ Transactions on Power and Energy
Online ISSN : 1348-8147
Print ISSN : 0385-4213
ISSN-L : 0385-4213
Volume 137 , Issue 9
Showing 1-17 articles out of 17 articles from the selected issue
Review
  • Hirotaka Chikaraishi
    2017 Volume 137 Issue 9 Pages 598-601
    Published: September 01, 2017
    Released: September 01, 2017
    JOURNALS RESTRICTED ACCESS

    All of the nuclear fusion experimental devices that have been constructed and operated so far were experimental apparatuses intended for experiments in the field of plasma physics and engineering. On the other hand, the nuclear fusion prototype reactor, which is planned to be designed and constructed in the future are plants that generate power and supply electricity. Because of this difference, control technology as a plant which is not required in the experimental equipment is required. The committee aims to contribute to future technology development towards a practical reactor by investigating and examining the plant and its control technology required after the prototype reactor.

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Paper
  • Tianhu Ma, Jumpei Baba, Yumiko Iwafune
    2017 Volume 137 Issue 9 Pages 602-613
    Published: September 01, 2017
    Released: September 01, 2017
    JOURNALS RESTRICTED ACCESS

    In this paper, we developed Unit Commitment model based on IEEJ EAST 10 Machine system model parameters, and constructed the Day-ahead market and Hour-ahead market. We analyzed the impact of PV penetration on both of Utility side and Microgrid side by the optimization of scheduling of utility side and Microgrid side respectively. We analyzed the impact of PV penetration on scheduling variation of pump generator and thermal power generator for utility, impact on variation of marginal energy market price, and analyzed the impact of variation of marginal energy market price on microgrid scheduling. Moreover, by the price-demand mode, Through Day-ahead market and Hour-ahead market, we analyzed the interaction effect of scheduling result for utility and microgrid each other. And last, we calculated and evaluated the fuel cost for both utility and microgrid in case of with market and without market respectively, and concluded that scheduling result for both of utility side and microgrid have been improved, the win-win result that total cost is low than without microgrid response has been verified.

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  • Tomohiro Nagashima, Kentaro Fukushima, Taku Noda
    2017 Volume 137 Issue 9 Pages 614-622
    Published: September 01, 2017
    Released: September 01, 2017
    JOURNALS RESTRICTED ACCESS

    Due to the rapid spread of renewable energy power sources in recent years, voltage rise problems in distribution systems caused by reverse power flow from these renewable energy power sources especially from photovoltaic (PV) power generation systems are of great concern. To cope with this kind of problems, conventional voltage regulation devices such as load-ratio transformers (LRTs) in the substation and step voltage regulators (SVRs) on the distribution line are basically used. If their voltage regulation capability is not sufficient, the power conditioning systems (PCSs) of PV power generation systems may be modified so as to supply reactive power and a static synchronous compensator (STATCOM) may be applied to the distribution system. Therefore, the coordination of these conventional and new voltage regulation devices is necessary for the design of smarter distribution systems, and electromagnetic transient (EMT) simulations of distribution systems with these devices have to be carried out to assess power quality. To this end, the authors have developed EMT simulation models of distribution substations, SVRs and distribution STATCOMs, and they are routinely used for power quality assessment studies. This paper presents these simulation models and a simulation example.

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  • Toshiya Nanahara, Dai Inose, Tatsuki Okamoto
    2017 Volume 137 Issue 9 Pages 623-631
    Published: September 01, 2017
    Released: September 01, 2017
    JOURNALS RESTRICTED ACCESS

    The paper examines the looking back impedance of photovoltaic power generation (PV) connected to a low voltage line. Although the impedance is one of the vital factors in managing voltage profiles of a power system, few studies have been reported on the impedance. This paper proposes two estimation methods of the impedance using regression and spectral analyses techniques. Since a power factor for the PVs under study is assumed to be unity, the resistance component of the impedance is estimated with the methods. The methods are applied to the actual data obtained for 28 PVs. The estimated resistance with the two methods closely agrees with each other; this implicates the validity of the estimate. The estimates show that the looking back resistance exhibits more than one order difference among the PVs and tends to be smaller for a PV connected to a three phase three wire system than for that connected to a single phase three wire system. The seasonal variations of the resistance are also discussed in this paper.

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  • Tadayuki Ogawa
    2017 Volume 137 Issue 9 Pages 632-636
    Published: September 01, 2017
    Released: September 01, 2017
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    The integration of Renewable Energy (RE) with existing Diesel Engine Generators (DEGs) is rapidly promoted to reduce the dependency on fossil fuels and improving the energy security in many Small Island Developing States (SIDS). This paper proposes the cost-effective methodology for grid stabilization to introduce RE in Micro-grid, through evaluating Levelized Cost of Electricity (LCOE) under increasing RE penetration.

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