• Title/Summary/Keyword: turbine power control device

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Modeling & Simulation of a Hydraulic Servo Actuator Cushion for Power Plants (발전소용 유압 서보액추에이터의 쿠션 모델링 및 시뮬레이션)

  • Lee, YongBum;Yoon, Young Hwan
    • Tribology and Lubricants
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    • v.29 no.1
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    • pp.7-12
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    • 2013
  • Turbine power control devices at a nuclear / thermoelectric power plant lead to failure by creating mechanical shocks and strong vibrations that are due to the strong elasticity of a spring and the inertia of the valve face during its rapid movement to block steam. To ensure durability of the turbine power control device, which is the main component in the power plant, it is necessary to develop a device that can prevent such vibrations. In this study, a cushion mechanism is added to the head of the hydraulic servo actuator, which is a turbine power control device. Moreover, the cushion mechanism, which includes various modifies shapes and orifices is investigated dynamically through modeling and simulations.

A Study on the Digital Unit Development for Turbine Load Set Control (Turbine Load Set 조정을 위한 Digital Unit 개발)

  • Moon Yong-Seon;Jeong Ho-Jin;Kang Sung-Ryul;Choi Hyeong-Yoon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.9 no.3
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    • pp.498-503
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    • 2005
  • As important device that decide output load in superannuated thermoelectric power plant which do Turbine Load Set Motor device. This generation of electric power system operated Set Up Range Motor according to Set Up value that operator manufactures by hand circumvolve, and generation of electric power output load derision is consisted by internal action including Motor Therefore, in this research passively output load operated Turbine Motor Drive equipment that can have existing Turbine Load Set Motor Performance developing Digital Drive Unit device design. Also control algorithm implementation and existing Turbine Load Set Motor Drive and connection possibility through designed controlling system to connect basis function that decide development output load with Digital Drive Unit that designed also with existing Motor Drive Unit and can be operated.

Modeling and Simulation of Loss of Excitation of Hydro Generator Control System (수력 발전기 제어시스템의 계자상실 모델링과 시뮬레이션)

  • Park, Chul-Won
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.2
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    • pp.74-80
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    • 2014
  • Generator protection device has to detects an internal fault conditions in generator and abnormal operating conditions must be due to the hazards. Loss of excitation may cause generator itself failure as well as serious operating problem in power system, and then requires an appropriate response of generator protection device. Details modeling of generator control system and analysis of transient states in generator are important for optimal operation in power plants. In addition, the fault simulation data are also used for testing the characteristics of IED. In this paper, the hydro generator control system using PSCAD/EMTDC, visual simulation for power systems, was modeled. The generator control system which is composed of generator, turbine, exciter, governor was implemented. The parameters of generator control system model were obtained from field power plant. Loss of excitation simulations were performed while varying the fixed load. Several signals analysis were also performed so as to analyze transients phenomena.

A comparison of speed control of various turbines according to power plant types (발전방식별 여러 가지 터빈의 속도제어 비교)

  • Choi, I.K.;Jeong, C.K.
    • Proceedings of the KIEE Conference
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    • 2001.07d
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    • pp.2314-2316
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    • 2001
  • The steam gererator which produces thermal energy from coal or gas is a very important device in power plants, including the turbine driving synchronous generator which transforms kinetic energy into electrical energy. The turbine and the generator are driven by many kinds of media according to the types of which power plants are classified into steam turbine generator, gas turbine generator, water turbine generator and so on. This paper introduces the overspeed protection as well as the various speed and load control methods of some types of turbines.

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Development of Start·Stop Control System at Water Turbine Generator for Tidal Power Plant (조력발전소를 위한 수차발전기의 기동·정지 제어시스템 개발)

  • Cho, Byong-Og;Park, Chul-Won
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.6
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    • pp.106-112
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    • 2014
  • Recently, tidal power generation has gained much attention. South Korea's tidal power generation systems were imported from abroad by turnkey type and have being operated. Therefore, for efficient operation and technological independence of a tidal power system, development of core technology is required. This paper deals with the start stop control system of water turbine generator in the tidal power plant, as one of our development project results. Using the SCADA system, the status and operations of water turbine generator in the tidal power plant, as well as simulation for calculation of maximum power were carried out. A small model type of start stop control device was also developed. In addition, the control system in Sihwa tidal power plant was modeled, and the results obtained by the dynamic simulation were given in graphics by 2D simulator.

A Study on the Reliability Improvement of the Turbine Control Valve System in Nuclear and Thermal Power Plants (원자력/화력발전소의 터빈제어밸브시스템의 신뢰성 향상에 관한 연구)

  • Yang, Jong Dae;Yang, Seok Jo;Lee, Yong Bum
    • Journal of Drive and Control
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    • v.16 no.4
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    • pp.93-100
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    • 2019
  • Nuclear and thermal power plants must provide the turbines with an appropriate degree of high temperature and high pressure steam, to produce the optimum electricity. Additionally, in the event of system and power system failure during electrical production, the steam is immediately disabled, to protect the turbines and generators rotating at high speed. The plant thus uses a special steam control valve system for turbine control, which is opened by force of the hydraulic servo actuator and closed by a large steel spring force. In this study, the causes of failure of the turbine control valve system, a key device of the power plants, were analyzed, and the causes of failure were improved relative to reliability of the equipment.

Development of Integrated Start-up and Excitation System for Gas Turbine Synchronous Generator (가스터빈 동기기 통합형 기동 및 여자시스템 개발)

  • Ryu, Hoseon;Cha, Hanju
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.3
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    • pp.183-188
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    • 2014
  • Power conversion systems used in large gas turbine power plant can be divided into two main part. Because of the initial start-up characteristic of the gas turbine combustor, the gas turbine must be accelerated by starting device(LCI : Load Commutated Inverter) up to 10%~20% of rated speed to ignite it. In addition, the ECS(Excitation Control system) is used to control the rotor field current and reactive power in grid-connected synchronous generator. These two large power conversion systems are located in the same space(container) because of coordination control. Recently, many manufactures develop high speed controller based on function block available in the LCI and ECS with the newest power semiconductor. We also developed high speed controller based on function block to be using these two system and it meets the international standard IEC61131 as using real-time OS(VxWorks) and ISaGRAF. In order to install easily these systems at power plant, main controller, special module and IO module are used with high speed communication line other than electric wire line. Before initial product is installed on the site, prototype is produced and tests are conducted for it. The performance results of Integrated controller and application program(SFC, ECS) were described in this paper. The test results will be considered as the important resources for the application in future.

Development of the Furling Control Type Small Wind Turbine System (과풍속 출력 제한형 소형 풍력 발전장치 개발)

  • Choi, Young-Chul;Kim, Chul-Ho;Lee, Hyun-Chae;Seo, Young-Taek;Han, Young-Oun;Song, Jung-Il
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.6
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    • pp.693-701
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    • 2012
  • In this study, a small wind turbine airfoil specialized for national wind condition was designed in order to develop the furling control type HAWT. And then a flow analysis was carried out based on the blade drawing which was designed to characterize of the developed airfoil. The result of the flow analysis showed that the torque on the 3 blades was 180.23N.m. This is equivalent to an output power of 5.66kw and an output efficiency of 0.44. Then we produced and constructed a 3kW - furling control type HAWT by getting the system unit design technology such as the specialized furling control device. By operating this turbine, we could get 3kW of the rated power at a wind speed of 10.5m/s through the ability test. Cut-in wind speed was 2m/s, generator efficiency was 92% at the rated power output. Sound power level was 87.2dB(A). Also we observed that the output power was limited to 10.5m/s with furling system operation.

A Study of a Novel Wind Turbine Concept with Power Split Gearbox

  • Liu, Qian;Appunn, Rudiger;Hameyer, Kay
    • Journal of international Conference on Electrical Machines and Systems
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    • v.2 no.4
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    • pp.478-485
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    • 2013
  • This paper focuses on the design and control of a new concept for wind turbines with a planetary gearbox to realize a power split. This concept, where the generated wind power is split into two parts, is to increase the utilization of the wind power and may be particularly suitable for large scale off-shore wind turbines. In order to reduce the cost of the power electronic devices, a synchronous generator, which is driven by the planetary gear, is directly connected to the power grid without electronic converter. A servo drive, which functions as the control actuator, is connected to the power grid by a power electronic converter. With small scale power electronic device, the current harmonics can also be reduced. The speed of the main shaft is controlled to track the optimal tip speed ratio. Meanwhile the speed of the synchronous generator is controlled to stay at the synchronous speed. The minimum rated power of the servo motor and the converter, is studied and discussed in this paper. Different variants of the wind turbine with a planetary gear are also compared. The controller for optimal tip speed ratio and synchronous speed tracking is given.

A Wind Turbine Simulator with Variable Torque Input (풍력 터빈 모의 실험을 위한 가변 토오크 입력형 시뮬레이터)

  • Jeong, Byeong-Chang;Song, Seung-Ho;No, Do-Hwan;Kim, Dong-Yong
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.8
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    • pp.467-474
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    • 2002
  • In this paper, a wind power simulator is designed and implemented. To realize the torque of wind blade, a DC motor is used as a variable torque input device. An induction machine is used as a generator of which speed is controlled to maintain the optimal tip speed ratio during wind speed change. Input torque of system is controlled by armature current of DC motor and speed is controlled by generator control unit using field oriented control algorithm. Various control algorithms such as MPPT, soft start up, the simulator reactive power control, can be developed and tested using the simulator.