IEEJ Journal of Industry Applications
Online ISSN : 2187-1108
Print ISSN : 2187-1094
ISSN-L : 2187-1094
Volume 6 , Issue 5
Showing 1-5 articles out of 5 articles from the selected issue
  • Mitsumasa Ushiroda, Takaaki Wakimoto, Hiroaki Yamada, Toshihiko Tanaka ...
    2017 Volume 6 Issue 5 Pages 303-310
    Published: September 01, 2017
    Released: September 01, 2017

    This paper proposes a voltage-rise-suppression strategy with a power quality compensator for a roof-top home solar power system (HSPS) connected to the point of common coupling (PCC) in single-phase three-wire distribution feeders (SPTWDFs). The proposed reactive power control and power quality compensation strategy uses only a constant dc-capacitor voltage control, which is always used in grid-connected inverters. No calculation blocks of the reactive and unbalanced active components of the load currents are necessary. Thus, the authors provide the simplest algorithm to suppress the voltage rise at the PCC with power quality compensation. The basic principle of the constant dc-capacitor voltage-control-based strategy is discussed in detail. The instantaneous power flowing into the HSPSs shows that the predefined power factor of 0.9, a value that conforms to the Japanese regulations, is achieved with improved-quality source-currents of domestic consumers connected to SPTWDFs, suppressing the voltage rise at the PCC. A digital computer simulation is implemented to confirm the validity and high practicability of the proposed control algorithm for HSPSs using a typical SPTWDF model in Japan. Simulation results demonstrate that the proposed control method for the roof-top HSPS suppresses the voltage rise at the PCC, improving the source-side power quality.

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  • Aviti Mushi, Sakahisa Nagai, Hidemine Obara, Atsuo Kawamura
    2017 Volume 6 Issue 5 Pages 311-319
    Published: September 01, 2017
    Released: September 01, 2017

    This paper proposes a fast and robust nonlinear deadbeat control for boost DC-DC converters. First, the nonlinear state equation is derived, and second a nonlinear current reference deadbeat control is proposed. Third, a new nonlinear controller to implement the load disturbance compensation is proposed. After the simulations and verification by experiments, it was confirmed that under the conditions of an input voltage of 12V, an output voltage of 20V, a load resistance of 4Ω and a sampling frequency of 100kHz, the voltage command tracking capability of a settling time of 280µs was achieved, and an output voltage recovery time of 1.46ms was achieved for a sudden load change.

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  • Kenta Tsuda, Tomoki Sakuma, Kodai Umeda, Sho Sakaino, Toshiaki Tsuji
    2017 Volume 6 Issue 5 Pages 320-327
    Published: September 01, 2017
    Released: September 01, 2017

    Electro-hydrostatic actuators (EHAs) are hydraulic actuators with high power-to-weight ratios that exhibit low energy loss. Thus far, methods for determining the characteristics and parameters of EHAs have not been fully established. Therefore, modeling methods for EHA are in demand. EHAs are driven by servomotors on the motor-side and hydraulic motors on the load-side, and therefore, the actuators are expected to experience sympathetic vibrations. Thus, EHAs can be considered as systems in which two rigid objects are connected to one another with a low-rigidity shaft such as a spring. The occurrence of resonance in EHAs has not yet been discussed because of difficulties with hydraulic systems. One major problem is the large friction in hydraulic motors. We apply a feedback modulator for friction compensation to enable the experimental identification of characteristics. Assuming that EHAs experience two-inertia resonance, the parameters of the motors can be calculated. In addition, vibration-suppression techniques for two-inertia systems can be applied to EHAs. This study proposes the application of a two-inertia model to suppress vibrations in EHAs and verify their dynamic characteristics.

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