Optimal Energy Distribution Control at the Steel Works

Abstract

Many energy control systems developed for the steel works have been concerned with on-line monitoring and logging system for energy current. However there have been very few systems developed for the optimal total energy control of the steel works.There are two reasons for this. One is the problem of correctly forecasting the energy consumption and second is the problem of choosing a practical method for optimal control.This paper deals with both the theoretical and practical solution devised for the above two items at Sumitomo Metal Ind., Ltd.With regard to solving the forecasting problem, we forecast the 24 Hr energy generation and consumption using the Auto Regressive Moving Average model with eXogenous variable (ARMAX), with Kalman Filter.With regard to choosing a practical method for optimal energy control, we use the ”Oradient Method”. We composed the Energy factor as a 96-dimentional ( = 4 items x 24 Hr ) vector ( = X). As a function of vector X we represented the linear restriction of energy balance (∑aijXj≦bi) and the non- linear object function (income and outgo = V(X) ).This optimizes vector X so as to minimize V( X ) under the given condition (∑aijXj≦bi).