• Title/Summary/Keyword: multi-generator

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A Study on the Flexible Generator Maintenance Scheduling using Fuzzy Theory (퍼지이론을 이용한 유연한 발전기보수유지계획 수립에 관한 연구)

  • Kim, Hong-Sik;Moon, Seung-Pil;Choi, Jae-Seok
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1104-1107
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    • 1999
  • A new technique using search method based on fuzzy multi-criteria function is proposed fur flexible generator maintenance scheduling. Minimization of probabilistic production cost, maximization of system reliability level and air pollution are considered fur fuzzy multi-criteria function. To obtain an optimal solution for generator maintenance scheduling under fuzzy environment fuzzy multi-criteria relaxation method(fuzzy search method) is used. The practicality and effectiveness of the proposed approach are demonstrated by the simulation results of the real size model system of KEPCO-1997 SYSTEM.

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Multi Area Economic Dispatch using Secant Method

  • Sudhakar, A.V.V.;Chandram, Karri;Jayalaxmi, A.
    • Journal of Electrical Engineering and Technology
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    • v.8 no.4
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    • pp.744-751
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    • 2013
  • In this paper, Secant method is proposed to solve multi area economic dispatch (MAED) problem. Generator limits of all generators in each area are calculated at given area power demands plus export (or import) using secant method and the generator limits of all generators are modified as modified generator limits. Central economic dispatch (CED) problem is used to determine the output powers of all generators. Here, Secant method is applied to solve the CED problem. The proposed approach has been tested on two-area (two generators in each area) system and four-area (four generators in each area) system. It is observed from various cases that the proposed approach provides optimally best solution in terms of cost with tie line loss with less computational burden.

Stabilization of Fixed Speed Wind Generator by using Variable Speed PM Wind Generator in Multi-Machine Power System

  • Rosyadi, Marwan;Takahashi, Rion;Muyeen, S.M.;Tamura, Junji
    • Journal of international Conference on Electrical Machines and Systems
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    • v.2 no.1
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    • pp.111-119
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    • 2013
  • This paper present stabilization control of fixed speed wind generator by using variable speed permanent magnet wind generator in a wind farm connected with multi-machine power system. A novel direct-current based d-q vector control technique of back to back converter integrated with Fuzzy Logic Controller for optimal control configuration is proposed, in which both active and reactive powers delivered to a power grid system are controlled effectively. Simulation analyses have been performed using PSCAD/EMTDC. Simulation results show that the proposed control scheme is very effective to enhance the voltage stability of the wind farm during fault condition.

A Daily Scheduling of Generator Maintenance using Fuzzy Set Theory combined with Genetic Algorithm (퍼지 집합이론과 유전알고리즘을 이용한 일간 발전기 보수유지계획의 수립)

  • Oh, Tae-Gon;Choi, Jae-Seok;Baek, Ung-Ki
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.7
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    • pp.1314-1323
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    • 2011
  • The maintenance of generating units is implicitly related with power system reliability and has a tremendous bearing on the operation of the power system. A technique using a fuzzy search method which is based on fuzzy multi-criteria function has been proposed for GMS (generator maintenance scheduling) in order to consider multi-objective function. In this study, a new technique using combined fuzzy set theory and genetic algorithm(GA) is proposed for generator maintenance scheduling. The genetic algorithm(GA) is expected to make up for that fuzzy search method might search the local solution. The effectiveness of the proposed approach is demonstrated by the simulation results on a practical size test systems.

A Study on control mode of hybrid multi-function welder (하이브리드 다기능 용접기 제어 모드에 관한 연구)

  • Kim, Jin-Seok;Choi, Jae-Ho;Jeong, Yang-Kwon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.8 no.3
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    • pp.439-445
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    • 2013
  • This study is on the system that can integrate generator and charger to use as a welder and generator for need. Specifically, it was hybrid generator consisted with select switch to use generator controller and multiple function welder, that function were auto-stopping generator when generator power finish to recharge in recharger battery and Co2 MMA TIG MIG MAG are devide depend on supplying gas. This control system of voltage, high-frequency, motor and gas valve was implemented in order to improve the performance and convenience of existing welders to choose only one or two at a time.

Output Characteristics of Small Wind Power Generator Applying Multi-Layered Blade (다층형 블레이드를 적용한 소형 풍력발전기의 출력특성)

  • Lee, Min-Gu;Park, Wal-Seo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.11
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    • pp.663-667
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    • 2017
  • Fuel depletion and environmental problems due to the use of fossil fuels have been worsening of late, and the development of alternative energy sources is urgently required to address these problems. Among the alternative energy sources, wind energy is attracting much attention as a clean energy source, because it can be used unlimitedly without any pollutant emissions. In wind power generation, wind energy is converted to kinetic energy through rotor blades and this kinetic energy is converted to electric energy through generators. The design and manufacturing of the blades, which are the major parts of wind power generators, are very important, but South Korea still lacks the requisite basic data and key technologies and, therefore, has to import the blades from overseas. In this study, multi-layered blades capable of generating power at low wind speeds were applied to a small wind power generator and the output characteristics of the generator according to the wind speed and the number of blades were analyzed. As a result, at the maximum wind speed of 8m/s, the application of three blades achieved up to 33% and 18% higher generator output voltage, up to 33% and 15% higher generator output current, and up to 23% and 13% higher generator RPM than the application of one or two blades, respectively. In this study, the application of multi-layered blades to a small wind power generator was shown to improve the output characteristics of the generator and make the collection of electric energy possible even at low wind speeds.

Multi-site Daily Precipitation Generator: Application to Nakdong River Basin Precipitation Gage Network (다지점 일강수 발생모형: 낙동강유역 강수관측망에의 적용)

  • Keem, Munsung;Ahn, Jae Hyun;Shin, Hyun Suk;Han, Suhee;Kim, Sangdan
    • Journal of Korean Society on Water Environment
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    • v.24 no.6
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    • pp.725-740
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    • 2008
  • In this study a multi-site daily precipitation generator which generates the precipitation with similar spatial correlation, and at the same time, with conserving statistical properties of the observed data is developed. The proposed generator is intended to be a tool for down-scaling the data obtained from GCMs or RCMs into local scales. The occurrences of precipitation are simultaneously modeled in multi-sites by 2-parameter first-order Markov chain using random variables of spatially correlated while temporally independent, and then, the amount of precipitation is simulated by 3-parameter mixed exponential probability density function that resolves the issue of maintaining intermittence of precipitation field. This approach is applied to the Nakdong river basin and the observed data are daily precipitation data of 19 locations. The results show that spatial correlations of precipitation series are relatively well simulated and statistical properties of observed precipitation series are simulated properly.

Multi Degree of Freedom Linear Electric Generator for Structural Concerns and Electric Generation Improvement of the Linear Electric Generator in a Vehicle Suspension (차량 현가장치 선형 발전기 구조 검토 및 발전량 향상을 위한 다자유도 선형 발전기)

  • Choi, Ji-Hyun;Kim, Jin Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.9
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    • pp.5452-5459
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    • 2014
  • A resonance linear electric generator in a vehicle suspension is a system that performs self-electric generation by collecting the vibration energy when a vehicle runs on a road, and takes the resonance phenomenon to derive large electric generation from slight road surface vibrations. In this paper, the motions of an armature in three different electric generator structures were simulated and the actual generation quantity was calculated and compared with these results. Furthermore, when the vehicle runs on the road, the design improvement for a multi-degree of freedom electric generator was conducted to make the resonance respond to various excitation frequencies, and the change in the resonance points and generation quantity were identified.

A Numerical Analysis of Internal Nozzle Flows Through the Multi-Fluid Model (다유체 모델을 이용한 노즐 내부 유동에 대한 수치적 연구)

  • Ryu, Bong-Woo;Lee, Chang-Sik
    • Journal of ILASS-Korea
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    • v.16 no.4
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    • pp.186-194
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    • 2011
  • This study performed the numerical analysis of the internal nozzle flows including cavitation phenomena by using the automated body-fitted grid generator and the multi-fluid model. The effect of grid refinement and the validation of multifluid model were investigated using four computational meshes under two test conditions. The mesh #3 was chosen as the optimum which can reduce the computational time and have good prediction ability to identify the cavitation region simultaneously. In addition, the computed results using multi-fluid model were compared with the reference experimental observations and numerical simulation results using homogeneous equilibrium model. From the distribution of volume fraction and velocity field, the multi-fluid model predicted the internal nozzle flows well when the liquid quality parameters were selected as $1.0{\times}10^{12}$ for initial number density and 25 ${\mu}m$ for bubble diameter.

Design of Graphic Generator for Driving HUD(Head-Up Display) and MFD(Multi-Function Display) (전방시현기 및 다기능시현기 구동을 위한 그래픽 영상생성기 설계 연구)

  • 황상현;이재억;박덕배
    • Journal of the Korea Institute of Military Science and Technology
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    • v.5 no.2
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    • pp.72-82
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    • 2002
  • This paper presents the design technology of a Graphic Generator which drives the embedded aircraft display equipments such as HUD(Head-Up Display) and MFD (Multi-Function Display) those provide pilot with the most important mission information. The main issue of this design is how we can implement the real-time embedded graphic generator using a general purpose processor as a substitute for the obsolete the production of specific graphic processor in the military market. So we proposed two kinds of method that one is a software solution so called graphic kernel system, interpreting the display file, controlling the graphic system and pre-processing graphic primitives, the other is a hardware solution so called graphic engine, interpreting passed commands through the graphic kernel system, post-processing the looping calculation taking much of time as implemented by software. We have tested and verified the functionalities and the required performance of Graphic Generator.