Steel Science Portal

Transactions of the Institute of Systems, Control and Information Engineers
New Arrival Alert : OFF

You can use this feature after you logged into the site.
Please click the button below.

Log in / Sign up
ONLINE ISSN: 2185-811X
PRINT ISSN: 1342-5668

Transactions of the Institute of Systems, Control and Information Engineers Vol. 33 (2020), No. 8

  • Scalable Optimization Approach of Optimal PV Sizing Problem for Minimizing Network Loss and Inverter Loss

    Shunnosuke Ikeda, Shohei Kusuhara, Akiko Takeda, Hiromitsu Ohmori

    pp. 229-241

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.5687/iscie.33.229

    Abstract

    The use of photovoltaics (PV) in electric power networks has increased because of advantages such as power loss reduction, environmental friendliness, voltage profile improvement, and postponement of system upgrades. However, using PVs of an inappropriate size leads to greater power losses due to variations in PV outputs and demand loads. This paper formulates the optimal sizing PV problem (OPSP) for minimizing inverter losses and network losses. The OPSP is a large-scale and non-convex optimization that is difficult to solve. To resolve this computational issue, this paper proposes a new approach that consists of two steps. The first step is to relax the original non-convex problem into a convex one and to prove that the convexification is exact provided that over-satisfaction of the load is allowed. The second step is to decompose the original large-scale optimization into small-scale sub-problems. Moreover, the decomposed sub-problems can be computed in parallel. Numerical simulations implementing parallel processing verify the effectiveness of our approach.

  • Auto Tuning of PID Controllers for Dynamic Positioning Systems with Nonlinearity

    Yusuke Endo, Satoshi Otsuki, Takafumi Okamoto, Tsuyoshi Koga, Kenichi Nakashima

    pp. 242-249

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.5687/iscie.33.242

    Abstract

    This paper describes an application of Fictitious Reference Iterative Tuning (abbr. FRIT) to the Dynamic Positioning System (abbr. DPS), which is an automatic control system for ship positioning. We developed the motion equation including nonlinear fluid forces with respect to the relative velocity between a vessel and a current and adjusted control parameters by employing FRIT to such a nonlinear system. We mentioned that it was difficult to design the desired transfer function appropriately and proposed to use known information about a real plant. In particular, we used a nominal plant model to design desired transfer function. Furthermore, since disturbance attenuation is the primary purpose in the DPS, we designed the evaluation function which provides the control parameters that give the desired output response to the input disturbance (e.g. wind, wave). The simulation results show that the evaluation function based on the load disturbance sensitivity function (quasi sensitivity function) gives a better output response to the disturbance than the sensitivity function.

  • An Analysis of the Worst-case Disturbance on Airplane Vertical Acceleration using the Generic Transport Model

    Hideki Fukunaga, Yoshiro Hamada, Kenji Sawada, Seiichi Shin

    pp. 250-252

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.5687/iscie.33.250

  • © 2020 THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

Article Access Ranking

06 May. (Last 30 Days)

  1. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  2. Steam Reforming of Methane on Sponge Iron: Influence of Gas Composition on Reaction Rate ISIJ International Vol.61(2020), No.1
  3. Preface to the Special Issue on “Toward Suppression of Hydrogen Absorption and Hydrogen Embrittlement for Steels” ISIJ International Vol.61(2021), No.4
  4. Automatic Ultrasonic Testing of Non-metallic Inclusions Detectable with Size of Several Tens of Micrometers Using a Double Probe Technique along the Longitudinal Axis of a Small-diameter Bar ISIJ International Vol.61(2020), No.1
  5. Three-dimensional Investigations of Non-metallic Inclusions in Stainless Steels before and after Machining ISIJ International Advance Publication
  6. Rapid Method to Measure Hydrogen Diffusion Coefficient in Metal Using a Multi-sine Wave Signal ISIJ International Vol.61(2021), No.4
  7. Review of Positron Lifetime Studies of Lattice Defects Formed during Tensile Deformation in a Hydrogen Environment ISIJ International Vol.61(2021), No.4
  8. Method for Evaluating Hydrogen Embrittlement of High-Strength Steel Sheets Considering Press Formation and Hydrogen Existence State in Steel ISIJ International Vol.61(2021), No.4
  9. Decarburizing Behavior and Its Effect on Mechanical Properties of Ultrahigh Strength Steel Sheets ISIJ International Vol.61(2021), No.4
  10. Effects of Alloying Elements on Hydrogen Diffusion in Iron ISIJ International Vol.61(2021), No.4

Search Phrase Ranking

06 May. (Last 30 Days)

  1. blast furnace
  2. blast furnace permeability
  3. coke oven gas injection
  4. ultrasonic inclusion
  5. blast furnace productivity
  6. continuous casting of electrical steel
  7. slag
  8. activities in the liquid solution sio2-cao- mgo-al2o3 at 1600℃
  9. activity coefficient of ti in liquid iron
  10. cokes gasification