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

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

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

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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

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Auto Tuning of PID Controllers for Dynamic Positioning Systems with Nonlinearity

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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

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

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DOI:10.5687/iscie.33.250

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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

Share it with SNS

Auto Tuning of PID Controllers for Dynamic Positioning Systems with Nonlinearity

Share it with SNS

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

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