IEEJ Transactions on Power and Energy
Online ISSN : 1348-8147
Print ISSN : 0385-4213
ISSN-L : 0385-4213
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Volume 132, Issue 2
Displaying 1-21 of 21 articles from this issue
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Special Issue on IWHV 2010
Preface
Special Issue Review
  • On-site PD Diagnostics, FRA and Moisture Measurement for Power Transformers
    Stefan Tenbohlen, Maximilian Heindl, Mark Jovalekic
    2012 Volume 132 Issue 2 Pages 134-138
    Published: February 01, 2012
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.1541/ieejpes.132.134
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    The paper presents three methods for condition assessment of power transformers which can be applied on-site. A combination of UHF and acoustic partial discharge (PD) measurement methods enables to detect PD in power transformers and to improve interpretation and localisation of their sources. Frequency response measurements are a widely applied technique for power transformer winding deformation detection. Dielectric response methods deliver results about the moisture condition of a transformer.
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Special Issue Paper
  • Effect of Electrode Surface Roughness in High Pressure CO2(∼0.9MPa) under Quasi-Uniform Electric Field
    Takanori Yasuoka, Masayuki Sato, Yoshikazu Hoshina, Akira Shimamura
    2012 Volume 132 Issue 2 Pages 139-143
    Published: February 01, 2012
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.1541/ieejpes.132.139
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    SF6 gas is widely used as a insulation medium in Gas Insulated Switchgear (GIS) because SF6 has high insulation and interruption performance. Recently, the development of GIS using a substitute gas for SF6 gas has been strongly demanded from a viewpoint of environmentally friendly concepts. We are paying attention to CO2 gas as a substitute for SF6. In this paper, we discuss the breakdown (BD) characteristics of high-pressure CO2 up to 0.9MPa, especially the effects of electrode surface roughness under a quasi-uniform electric field. To compare the characteristics, experiments with SF6, Dry Air and N2 that were candidate substitute for SF6 gas were carried out. As experimental and analytical results, we clarified the effect of electrode surface roughness of CO2 gas quantitatively.
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  • Influence of Propagation Distance on Estimated Location of Return Strokes based on Measured E-Field
    Koji Michishita, Naoki Shibata, Yasuji Hongo
    2012 Volume 132 Issue 2 Pages 144-149
    Published: February 01, 2012
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.1541/ieejpes.132.144
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    The authors have carried out simultaneous measurements of the vertical E-field (electric field) at six points around Shirakawa area to investigate the possibility of the enhanced location accuracy. The accuracy of the lightning striking points estimated by the TOA (time-of-arrival) technique is evidenced by comparison with the actual location and is estimated less than 209m. The parameters on the front of the E-field waveforms are influenced by the attenuation of the high frequency components associated with the propagation of the wave over finitely conducting ground (so-called the propagation effect) and the average ground conductivity at the area is estimated 5-20mS/m. In general, the location of the lightning striking points estimated by the TOA is little influenced by the propagation effect when the propagation distance is shorter than 30km.
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Paper
  • A Consideration on the Determination of Ratings of Energy Storage System for Smoothing Wind Generator Output
    Norifumi Kurose, Rion Takahashi, Junji Tamura, Tomoyuki Fukushima, Ats ...
    2012 Volume 132 Issue 2 Pages 150-162
    Published: February 01, 2012
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.1541/ieejpes.132.150
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    Wind turbine generator output fluctuates due to wind speed variations. Hence, wind farm output can have a serious influence on the power system frequency. Therefore smoothing control of wind generator output fluctuations is very important. With these points as background, there have been many reports so far about suppressing of the fluctuations by using energy storage system. This paper proposes an evaluation method for determining the power rating and energy capacity of Energy Storage System for smoothing the wind generator output fluctuations.
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  • A Method for Compensating Customer Voltage Drops due to Nighttime Simultaneous Charging of EVs Utilizing Reactive Power Injection from Battery Chargers
    Taku Noda, Yuichiro Kabasawa, Kentaro Fukushima, Koshichi Nemoto, Sato ...
    2012 Volume 132 Issue 2 Pages 163-170
    Published: February 01, 2012
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.1541/ieejpes.132.163
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    When we consider the global warming, the reduction of CO2 emission is one of the most important problems which require urgent solutions. One option is to integrate low-CO2-emission generators to the grid as much as possible. Another option is to replace inefficient vehicles based on internal-combustion engines with electric ones (EVs). Due to the latter, we can easily estimate that most consumers will charge EVs' batteries at nighttime. Thus, excessive voltage drops due to the nighttime simultaneous charging are supposed to be a possible future problem. This paper proposes a method for compensating the voltage drops by injecting reactive power from EV battery chargers.
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  • Security Issues for Mega Penetration of Photovoltaic Power Generations in Future Electric Power Systems
    —A Case Study of Stability for Power Swing Oscillation using IEEJ WEST 10 Machines Model—
    Yoshiharu Okumoto, Naoto Yorino, Yutaka Sasaki, Yoshifumi Zoka, Shoki ...
    2012 Volume 132 Issue 2 Pages 171-180
    Published: February 01, 2012
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.1541/ieejpes.132.171
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    Mega penetration of photovoltaic power generations (PV) will be introduced in future electric power systems, coping with environmental problems such as global warming and energy exhaustion. The authors have pointed out that difficulties will arise in performing the N-1 security standard if increase in uncertainties cannot be avoided caused by the PV penetration. Then, we have proposed a new concept of “robust power system security” together with the several conditions to be satisfied to guarantee the N-1 security standard under the uncertainties. In this paper, (1) a model of uncertainties by PV generation is proposed based on the robust power system security; a method for proper parameter selection is also provided. Then, (2) the influence on the stability by the PV and load disconnection from the power system is studied through simulation using the model system; (3) the effect of PV's fault ride through (FRT) on the stability is investigated as well as dynamic voltage support (DVS). Finally, it is shown that (4) complicated burden tasks will be considerably increased in power system operation planning and real time operation in the future circumstance by the mega penetration of PV.
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  • Power Control of New Wind Power Generation System with Induction Generator Excited by Voltage Source Converter
    Toshimitsu Morizane, Noriyuki Kimura, Katsunori Taniguchi
    2012 Volume 132 Issue 2 Pages 181-188
    Published: February 01, 2012
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.1541/ieejpes.132.181
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    This paper investigates advantages of new combination of the induction generator for wind power and the power electronic equipment. Induction generator is popularly used for the wind power generation. The disadvantage of it is impossible to generate power at the lower rotor speed than the synchronous speed. To compensate this disadvantage, expensive synchronous generator with the permanent magnets is sometimes used. In proposed scheme, the diode rectifier is used to convert the real power from the induction generator to the intermediate dc voltage, while only the reactive power necessary to excite the induction generator is supplied from the voltage source converter (VSC). This means that the rating of the expensive VSC is minimized and total cost of the wind power generation system is decreased compared to the system with synchronous generator. Simulation study to investigate the control strategy of proposed system is performed. The results show the reduction of the VSC rating is prospective.
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  • A Fundamental Study on Spectrum Center Estimation of Solar Spectral Irradiation by the Statistical Pattern Recognition
    Aya Iijima, Kazumi Suzuki, Shinji Wakao, Norihiro Kawasaki, Akira Usam ...
    2012 Volume 132 Issue 2 Pages 189-196
    Published: February 01, 2012
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.1541/ieejpes.132.189
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    With a background of environmental problems and energy issues, it is expected that PV systems will be introduced rapidly and connected with power grids on a large scale in the future. For this reason, the concern to which PV power generation will affect supply and demand adjustment in electric power in the future arises and the technique of correctly grasping the PV power generation becomes increasingly important. The PV power generation depends on solar irradiance, temperature of a module and solar spectral irradiance. Solar spectral irradiance is distribution of the strength of the light for every wavelength. As the spectrum sensitivity of solar cell depends on kind of solar cell, it becomes important for exact grasp of PV power generation. Especially the preparation of solar spectral irradiance is, however, not easy because the observational instrument of solar spectral irradiance is expensive. With this background, in this paper, we propose a new method based on statistical pattern recognition for estimating the spectrum center which is representative index of solar spectral irradiance. Some numerical examples obtained by the proposed method are also presented.
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  • Development of a Simplified Calculation Tool for Voltage Drop caused by Transformer Inrush in Distribution System
    Yoshiki Nakachi, Takayuki Fukae, Toshinori Sugahara, Hayato Nakamura, ...
    2012 Volume 132 Issue 2 Pages 197-206
    Published: February 01, 2012
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.1541/ieejpes.132.197
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    It is well known that the voltage drop due to the inrush current at energizing transformer, may at times, interrupt electrical equipment. Generally, the voltage drop is calculated by using the sophisticated tool such as EMTP, so the transformer saturation phenomenon has been properly represented. However, it is not practical for distribution system engineers to calculate the voltage drop with transformer inrush by using EMTP, because there are a lot of network access requests needing such calculations with many kinds of transformers. Therefore, in this paper, a simplified and easy-to-use calculation tool for voltage drop caused by transformer inrush in distribution system is developed. In order to grasp the voltage drop by inrush current during the planning stage, it is formulated by considering the transformer saturation/unsaturation periods in each winding type, the developed tool is based on the versatile spreadsheet software such as Microsoft Excel®. It can be used with accuracy almost similar to the EMTP.
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Letter
  • Development of Calibrator for Impulse High Voltage Standard Measuring System
    Takayuki Wakimoto, Masaru Ishii
    2012 Volume 132 Issue 2 Pages 207-208
    Published: February 01, 2012
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.1541/ieejpes.132.207
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    The national standard class measuring system with known measurement uncertainties for the lightning impulse voltage in Japan was built in 2004. The values of uncertainties have been reviewed and new methods to evaluate uncertainties have been developed also. One of the new methods is to evaluate uncertainty values by combining the step response waveform and the convolution technique. The other method is by developing a low-voltage calibrator which can directly calibrate the measuring system. In this letter, the outline of the calibrator and evaluated uncertainty are reported on.
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