Hiroyuki Iki

Development of a dynamical model for customer’s gas turbine generator in industrial power systems

This paper presents a tool, which is implemented on the MATLAB/Simulink environment realizing a user friendly GUI system with object oriented configuration, to analyze the dynamical behavior of industrial electrical power system with a customerpsilas gas turbine power plant. A model consisting of a gas turbine system including the steam flow, a synchronous generator with mechanical and electrical system and an electrical power network with electric circuits is developed. The complicated structure of industrial gas turbine which supplies much steam as well as the mechanical torque for generator is represented clearly with the detailed governor system, synchronous generator and electric network models. Consistent links among subsystems are realized by the function of Simulink. Static and dynamic characteristics of the developed model are presented as well as a brief summary of the developed analysis tool for industrial power systems.

Generator excitation control using a parameter space design method

Recently, the trend of control engineering changes from classical control theory to modern control theory, and also analogue to digital with times. But, even now parameter adjustment in generator excitation control has been often carried out by the classical loop-shaping method using a Bode diagram. Modern control theory has seldom been used in practice due to the facts that the experience of using such design methods is insufficient and there are no introduction results in actual design situations. However, the classical loop-shaping method has some drawbacks, e.g., sensitivity adjustment procedure by a Bode diagram is complicated and cumbersome. In this paper we employ a loop-shaping method using Hinfin norm constraints, which is achieved via a parameter space approach accomplished by symbolic method called quantifier elimination (QE) and apply it to design PI control type AVR of the excitation control. The method allows us to determine appropriate parameter values of PI controller for visually in a parameter space. We report some simulation results for the PI control type AVR design and inspect the performance.

The development of a model of the industrial gas turbine generator on the analysis tool for the power system dynamics

Industrial power systems with industrial power generation plant have very complicated structures. In addition, these systems are usually interconnected with utilities, that is, disturbances in the utility network affect the operation and the protection coordination in industrial systems. Therefore, modeling and analysis technique for industrial power systems should become key issues. This paper presents the model of an industrial gas turbine generator developed on the power system analysis tool based on MATLAB/Simulink that we have developed.

Transient stability assessment of industrial power systems with detailed models implementation

This paper presents a brief summary of issues on industrial customers electrical power systems and an approach to analyze the transient behavior of a system with the group of self-generators, substations and many induction motors. Power oscillations and voltage recovery performance after some contingencies are recognized as typical issues on customers systems. The strong nonlinearity caused by the complicated system configuration falls into difficulties of the proper evaluation of the transient state. Power system analysis is an effective countermeasure for these issues, however, there are some problems on the modeling of each component for better assessment of inherent phenomena. In this paper, required models especially for the complicated governor system for the assessment of the dynamical process are discussed. These models are consistently implemented on the MATLAB/Simulink environment with object oriented configuration. Static and dynamic characteristics of the real power system of a petrochemical plant are investigated as an example.

A Dynamical Model for Customer's Gas Turbine Generator in Industrial Power Systems

This paper presents a tool, which is implemented on the MATLAB/Simulink environment realizing a user friendly GUI system with object oriented configuration, to analyze the dynamical behavior of industrial electrical power system with a customerpsilas gas turbine power plant. A model consisting of a gas turbine system including the steam flow, a synchronous generator with mechanical and electrical system and an electrical power network with electric circuits is developed. The complicated structure of industrial gas turbine which supplies much steam as well as the mechanical torque for generator is represented clearly with the detailed governor system, synchronous generator and electric network models. Consistent links among subsystems are realized by the function of Simulink. Static and dynamic characteristics of the developed model are presented as well as a brief summary of the developed analysis tool for industrial power systems.

A Shaft-Torsional Phenomenon of Customer's Gas-Turbine Generation System

Recent years, we come to be seen world wide that customers install private electric generator, because it enforces that deregulation of a power industry and electric power liberalization. Particularly, small capacity gas-turbine generation system is more than diesel generation system about exhausts gases and a floor space per capacity. Additionally, it is expected high efficiency use as the CGS. On the other hand, we are seen phenomenon that ldquoShearpinrdquo is damaged. ldquoShearpinrdquo is mechanism which privent that shaft-torsional torque by power system fault damaged shaft.