• Title, Summary, Keyword: electric power generator

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Study on the Operating Characteristics of Double Fed Induction Generator Connected AC network (계통 연계형 권선형 유도발전기의 동작특성 연구)

  • Kim Chan-Ki;Park Jong-Kwang;Choi Young-Do;Lim Seong-Joo;Moon Hyoung-Bae
    • Proceedings of the KIPE Conference
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    • pp.323-326
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    • 2006
  • This paper shows the comparison of operating characteristics between squirrel cage induction generator and DFIG(Double Fed Induction Generator). Because squirrel cage induction generator consume the reactive power due to magnetizing reactance, the capacitor is need to compensate the reactive power. Otherwise, two back-to-back PWM voltage-fed inverters connected between the stator and the rotor allow sub/super synchronous operation with low distortion currents. In this paper, the response characteristics of squirrel cage induction generator and DFIG, were analyzed and investigated using PSCAD/EMTDC.

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DEVELOPMENT OF A STEAM GENERATOR LANCING SYSTEM

  • Jeong Woo-Tae;Kim Seok-Tae;Hong Sung-Yull
    • Nuclear Engineering and Technology
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    • v.38 no.4
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    • pp.391-398
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    • 2006
  • It is recommended to clean steam generators of nuclear power plants during plant outages. Under normal operations, sludge is created and constantly accumulates in the steam generators. The constituents of this sludge are different depending on each power plant characteristics. The sludge of the Kori Unit 1 steam generator, far example, was found to be composed of 93% ferrous oxide, 3% carbon and 1% of silica oxide and nickel oxide each. The research to develop a lancing system that would remove sludge deposits from the tubesheet of a steam generator was started in 1998 by the Korea Electric Power Research Institute (KEPRI) of the Korea Electric Power Corporation (KEPCO). The first commercial domestic lancing system in Korea, the $KALANS^(R)-I$ Lancing System, was completed in 2000 for Kori Unit 1 for cleaning the tubesheet of its Westinghouse Delta-60 steam generator. Thereafter, the success of the development and site implementation of the $KALANS^(R)-I$ lancing system for YGN Units 1&2 and Ulchin Units 3&4 was also realized in 2004 for sludge removal at those sites. The upper bundle cleaning system for Westinghouse model F steam generators is now under development.

A Novel Three-Phase Four-Wire Grid-Connected Synchronverter that Mimics Synchronous Generators

  • Tan, Qian;Lv, Zhipeng;Xu, Bei;Jiang, Wenqian;Ai, Xin;Zhong, Qingchang
    • Journal of Power Electronics
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    • v.16 no.6
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    • pp.2221-2230
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    • 2016
  • Voltage and frequency stability issues occur in existing centralized power system due to the high penetration of renewable energy sources, which decrease grid absorptive capacity of them. The grid-connected inverter that mimics synchronous generator characteristics with inertia characteristic is beneficial to electric power system stability. This paper proposed a novel three-phase four-wire grid-connected inverter with an independent neutral line module that mimics synchronous generators. A mathematical model of the synchronous generator and operation principles of the synchronverter are introduced. The main circuit and control parameters design procedures are also provided in detail. A 10 kW prototype is built and tested for further verification. The primary frequency modulation and primary voltage regulation characteristics of the synchronous generator are emulated and automatically adjusted by the proposed circuit, which helps to supports the grid.

Application Study of An On-site Hydrogen Production System for Power Generator Cooling (발전기 냉각용 On-Site 수소 생산 시스템 적용연구)

  • Moon, Jeon-Soo;Lee, Jae-Kun;Park, Pyl-Yang;Park, Kyoung-Il
    • Transactions of the Korean hydrogen and new energy society
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    • v.20 no.5
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    • pp.410-415
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    • 2009
  • A hydrogen cooling method is used in a power generator for removing the unnecessary heat due to the windage loss of a rotor and the joule heat of a stator. A MEA (Membrane Electrolyte Assembly) hydrogen generator has been developed and applied as a hydrogen supplying system for the cooling of a 350MW power generator. As a field application result, the average potential of eleven cells and the voltage efficiency were measured 2.26V/cell and 65.4% (Higher Heating Value) respectively at the hydrogen pressure of 6 Bar, the hydrogen flow rate of 9.1L/min, and the current of 150A.

Critical Characteristics Estimation of a Large-Scale HTS Wind Turbine Generator Using a Performance Evaluation System

  • Kim, Taewon;Woo, Sang-Kyun;Kim, Changhyun
    • KEPCO Journal on Electric Power and Energy
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    • v.5 no.3
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    • pp.229-233
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    • 2019
  • Large-scale High Temperature Superconducting (HTS) wind power generators suffer from high electromagnetic force and high torque due to their high current density and low rotational speed. Therefore, the torque and Lorentz force of HTS wind power generators should be carefully investigated. In this paper, we proposed a Performance Evaluation System (PES) to physically test the structural stability of HTS coils with high torque before fabricating the generator. The PES is composed of the part of a pole-pair of the HTS generator for estimating the characteristic of the HTS coil. The 10 MW HTS generator and PES were analyzed using a 3D finite element method software. The performance of the HTS coil was evaluated by comparing the magnetic field distributions, the output power, and torque values of the 10 MW HTS generator and the PES. The magnetic flux densities, output power, and torque values of the HTS coils in the PES were the same as a pole-pair of the 10 MW HTS generator. Therefore, the PES-based evaluation method proposed in this paper can be used to estimate the critical characteristics of the HTS generator under high magnetic field and high torque before manufacturing the HTS wind turbines. These results will be used effectively to research and manufacture large-scale HTS wind turbine generators.

Development of Supply Capability Calculation and Prediction Technology for Generator (발전기 공급능력 산정 및 예측 기술개발)

  • Kim, Euihwan;An, Youngmo;Hong, Eunkee
    • KEPCO Journal on Electric Power and Energy
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    • v.2 no.3
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    • pp.425-431
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    • 2016
  • Supply Capability of the generator, if the maximum demand occurs, refers to the maximum power that can be stably supplied and it is possible to maintain stable power supply to be greater than actual load. However, unexpected power demand and reduction in supply Capability due to stop of unexpected generator in operation can temporarily make a big chaos in power system. In fact, due to a lack of power supply Capability in the country, enforced emergency load adjustment to the September 15, 2011, the circulation power outage has occurred in several cities. As the result, interrupted operation of the elevator and stopped hospital medical equipment led to a great deal of trouble to people's lives, causing a social problem. At that time, it was found that a failed frequency control because of smaller actual supply Capability than that of predicted. The difference was about 1,170 MW with Gas turbine power plant. By accurately calculating the generator supply capability, we can not only grasp the power reserve rate, but also correspond to the time of power supply instability.

Autonomous Micro-grid Design for Supplying Electricity in Carbon-Free Island

  • Hwang, Woo-Hyun;Kim, Sang-Kyu;Lee, Jung-Ho;Chae, Woo-Kyu;Lee, Je-Ho;Lee, Hyun-Jun;Kim, Jae-Eon
    • Journal of Electrical Engineering and Technology
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    • v.9 no.3
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    • pp.1112-1118
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    • 2014
  • In island and backcountry areas, electrical power is usually supplied by diesel generators. It is difficult for small scale diesel generators to have an economy of scale owing to the usage of fossil fuels to produce electricity. Also, there is a problem of carbon dioxide emissions that brings some environmental pollution to the entire region of the area. For solving those, this paper proposes a design method of autonomous micro-grid to minimize the fossil fuels of diesel generator, which is composed of diesel generator, wind turbine, battery energy storage system and photovoltaic generation system. The proposed method was verified through computer simulation and micro-grid operation system.

A Study on Insulation Properties of Global VPI Type Generator through Replacement of Stator Windings

  • Kong, Taesik;Kim, Heedong;Lee, Sooho;Park, Jaehyun
    • KEPCO Journal on Electric Power and Energy
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    • v.3 no.2
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    • pp.113-117
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    • 2017
  • As the competition in the manufacturing market for small and medium sized generators is intensifying, there is increasing pressure to reduce production cost. Manufacturing the generator stator windings with global vacuum pressure impregnation (GVPI) is a very effective way to reduce costs. However, the stator winding has a fatal disadvantage in that the insulation wears due to vibration in the slot. KEPRI (KEPCO Research Institute) conducted insulation diagnosis for three generators in KOMIPO (Korea Midland Power Co., Ltd.) which were manufactured by GVPI and operated for about 17 years. Insulation diagnosis showed that deterioration of insulation has progressed significantly. Therefore, KEPRI recommended replacing the stator windings of all three generators. In this paper, the insulation properties of the generator stator winding with global GVPI are described by comparing and analyzing the insulation diagnosis results and visual inspection for stator windings.

Load Test Simulator Development for Steam Turbine-Generator System of Nuclear Power Plant

  • Jeong, Chang-Ki;Kim, Jong-An;Kim, Byung-Chul;Choi, In-Kyu;Woo, Joo-Hee
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1384-1386
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    • 2005
  • This paper focuses on development of load test simulator of a steam turbine-generator in a nuclear power plant. When load is taken off from electrical power network, it is very difficult to effectively control the steam flow to turbine of the nuclear turbine-generator, because of disturbances, such as electrical load and network unbalance on electrical network. Up to the present time, the conventional control system has been used for the load control on nuclear steam generator, owing to the easy control algorithms and the advantage which have been proven on the nuclear power plant. However, since there are problems with stability control during low power and start-up, only a highly experienced operator can operate during those procedures. Also, a great deal of time and an expensive simulator is needed for the training of an operator. The KEPRI is developed simulator for 600MW nuclear power plant to take a test of generator load rejection, throttle valve, and turbine load control. Total load test is implemented before start up.

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