• Title, Summary, Keyword: Wind Power Farm

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Improvement in Active Power Control Methods for a Wind Farm Based on Modified Wind Turbine Control in Danish Grid Codes

  • Sim, JunBo;Song, Il-Keun;Lee, Yongseung;Lee, Hak-Ju;Choi, Yun-Hyuk
    • Journal of Electrical Engineering and Technology
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    • v.13 no.4
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    • pp.1438-1449
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    • 2018
  • The importance of power system stability has been emphasized with an increase of wind energy penetration in the power system. Accordingly, the guarantee on various control capabilities, including active and reactive power control of wind farms, was regarded as the most important aspect for the connection to the grid. To control the wind farm active power, the wind farm controller was introduced. The wind farm controller decides the power set points for each wind turbine generating unit and each wind turbine generating unit controls its power according to the set points from the wind farm controller. Therefore, co-relationship between wind farm controller and wind turbine controllers are significantly important. This paper proposes some control methods of wind farm active power control based on modified wind turbine control for power system stability and structures to connect wind turbine controllers to wind farm controller. Besides, this paper contributes to development of control algorithm considering not only electrical components but also mechanical components. The proposed contributions were verified by full simulation including power electronics and turbulent wind speed. The scenario refers to the active power control regulations of the Eltra and Elkraft system in Denmark.

Operation Scheme for a Wind Farm to Mitigate Output Power Variation

  • Lee, Sung-Eun;Won, Dong-Jun;Chung, Il-Yop
    • Journal of Electrical Engineering and Technology
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    • v.7 no.6
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    • pp.869-875
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    • 2012
  • Because of the nature of wind, the output power of wind turbines fluctuates according to wind speed variation. Therefore, many countries have set up wind-turbine interconnection standards usually named as Grid-Code to regulate the output power of wind farms to improve power system reliability and power quality. This paper proposes three operation modes of wind farms such as maximum power point tracking (MPPT) mode, single wind turbine control mode and wind farm control mode to control the output power of wind turbines as well as overall wind farms. This paper also proposes an operation scheme of wind farm to alleviate power fluctuation of wind farm by choosing the appropriate control mode and coordinating multiple wind turbines in consideration of grid conditions. The performance of the proposed scheme is verified via simulation studies in PSCAD/EMTDC with doubly-fed induction generator (DFIG) based wind turbine models.

A Study on the Optimal Operation Schemes for Large-scale Wind Farm (대규모 풍력 발전 단지의 최적운영 방안 연구)

  • Jeon, Young-Soo;Choy, Young-Do
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.5
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    • pp.365-371
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    • 2009
  • This paper studies the optimal operation schemes for large scale wind farm. With few operation experiences and fundamental technology for the wind farm, there is a difficult to establish the grid code which is the standard for connecting wind farm to power system. Analysis of the grid code and the operation of other nations for wind farm is used to propose the optimal operation schemes for large-scale wind farm considering the characteristic of our power system, by analyzing the influence of power system by wind farm at Cheju island.

Study of Wind Farm Model Configuration for WFMS simulation (WFMS 모의를 위한 풍력발전단지 모델 구성 연구)

  • Kim, Hyunwook;Jung, Seungmin;Hwang, Pyeong-Ik;Yoo, Yeuntae;Song, Sungyoon;Jang, Gilsoo
    • Proceedings of the KIEE Conference
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    • pp.247-248
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    • 2015
  • Wind turbines causes instabilities on the grid as their penetration increase. To mitigate harmful effects from wind turbines, transmission system operator(TSO) set up some requirements to obligate for wind generation operator for grid connection. So wind farm management system(WFMS) has important role to follow requirement from TSO, WFMS calculates available real power by considering wake effects, and dispatches real power order to each wind turbine in wind farm to optimize for decreasing load fatigue. To verify operation of WFMS, real-time simulator(RTS) is necessary. This paper deals with RTS configuration to verify WFMS operation. RTS includes wind farm model and power flow code. Normally, wind farm equivalent simple model makes wind turbines in wind farm to one wind turbine mode which cannot verify power flow in wind farm and WFMS operation. Thus, this paper makes wind farm model using simple wind turbine model with transfer function. Matlab is used for make power flow code and wind farm model to impose RTS and those model is certified by PSCAD/EMTDC.

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Robust Fuzzy Controller for Mitigating the Fluctuation of Wind Power Generator in Wind Farm (풍력발전단지의 출력변동저감을 위한 강인 퍼지 제어기 설계)

  • Sung, Hwa Chang;Tak, Myung Hwan;Joo, Young Hoon
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.1
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    • pp.34-39
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    • 2013
  • This paper proposes the implementation of robust fuzzy controller for designing intelligent wind farm and mitiagating the fluctuation of wind power generator. The existing researches are limited to individual wind turbine with variable speed so that it is necessary to study the multi-agent wind turbine power system. The scopes of these studies include from the arrangements of each power turbine to the control algorithms for the wind farm. For solving these problems, we introduce the composition of intelligent wind farm and use the T-S (Takagi-Sugeno) fuzzy model which is suitable for designing fuzzy controller. The control object in wind farm enables the minimizing the fluctuation of wind power generator. Simulation results for wind fram which is modelled as mathematically are demonstrated to visualize the feasibility of the proposed method.

A Reliability Model of Wind Farm Considering the Complex Terrain and Cable Failure Based on Clustering Algorithm

  • Liu, Wenxia;Chen, Qi;Zhang, Yuying;Qiu, Guobing;Lin, Chenghui
    • Journal of Electrical Engineering and Technology
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    • v.9 no.6
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    • pp.1891-1899
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    • 2014
  • A reliability model of wind farm located in mountainous land with complex terrain, which considers the cable and wind turbine (WT) failures, is proposed in this paper. Simple wake effect has been developed to be applied to the wind farm in mountainous land. The component failures in the wind farm like the cable and WT failures which contribute to the wind farm power output (WFPO) and reliability is investigated. Combing the wind speed distribution and the characteristic of wind turbine power output (WTPO), Monte Carlo simulation (MCS) is used to obtain the WFPO. Based on clustering algorithm the multi-state model of a wind farm is proposed. The accuracy of the model is analyzed and then applied to IEEE-RTS 79 for adequacy assessment.

Influence of the Interconnected Wind farm on Protection for Distribution Networks (풍력발전단지의 계통연계 운전이 배전선 보호계전에 미치는 영향)

  • 장성일;김광호
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.3
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    • pp.151-157
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    • 2003
  • Wind farm interconnected with grid can supply the power into a power network not only the normal conditions, but also the fault conditions of distribution network. If the fault happened in the distribution power line with wind fm, the fault current level measured in a relaying point might be lower than that of distribution network without wind turbine generator due to the contribution of wind farm. Consequently, it may be difficult to detect the fault happened in the distribution network connected with wind generator This paper describes the effect of the interconnected wind turbine generators on protective relaying of distribution power lines and detection of the fault occurred in a power line network. Simulation results shows that the current level of fault happened in the power line with wind farm depends on the fault impedance, the fault location. the output of wind farm. and the load condition of distribution network.

A New Control Scheme of Wind Farm Considering P,Q References (풍력 발전단지의 출력 지령값을 고려한 계통 연계 운영 방안)

  • Choi, Jung-Hyun;Park, Jin-Woo;Moon, Seung-Il
    • Proceedings of the KIEE Conference
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    • pp.1172-1173
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    • 2008
  • At the moment, the control ability of wind farms is a prime research concern for the grid integration of large wind farms, due to their required active role in the power system. As more wind turbines are installed, the power from wind energy will start to replace conventional generation units and its influence on power systems cannot be neglected. Besides, because of the intermittent nature of wind the output power of wind turbines fluctuates according to wind speed variation. Especially an isolated power system with small capacity such like Jeju needs more systematic solutions and regulations(grid code). This paper presents the idea of approach for centralized operating wind farm strategy to regulate the wind farm power production to the reference power ordered by the system operator. The doubly fed induction generator(DFIG) can control active and reactive power in feasible range. So wind farm comprised of DFIG has the possibility of a controllable component in the power system. The presented wind farm control has a hierarchical structure with both a wind farm control level and a wind turbine control level.

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Determination of the HESS Capacity for Mitigation of Fluctuation of Wind Farm Output under Consideration of Disconnecting Wind Farm (풍력발전단지 탈락 시를 고려한 단지 출력 변동 저감을 위한 HESS의 용량 산정)

  • Kim, SeongHyun;Ko, JiHan;Kim, Eel-Hwan
    • Proceedings of the KIPE Conference
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    • pp.388-389
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    • 2013
  • This paper presents the method for the fluctuation smoothing control by using relaxation time variable control of battery. When the output power of wind farm is changed suddenly, it is necessary to control the output power of wind farm. The smoothing relaxation time is changed within limits of battery output power. Using the hybrid energy storage system (HESS) combined with battery energy storage system and electric double layer capacitor, it is possible to control the output power of wind farm. The capacity of battery is determined by considering the case of the disconnecting wind farm from the grid. To verify the proposed method, simulations are carried out by using PSCAD/EMTDC with actual data of wind farm in the Jeju Island.

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Wake Losses and Repositioning of Wind Turbines at Wind Farm (풍력발전단지의 후류손실 및 터빈 재배치에 관한 연구)

  • Park, Kun-Sung;Ryu, Ki-Wahn;Kim, Hyun-Goo
    • Journal of the Korean Solar Energy Society
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    • v.35 no.3
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    • pp.17-25
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    • 2015
  • The main objective of this study is to predict the wind power generation at the wind farm using various wake models. Modeling of wind farm is a prerequisite for prediction of annual energy production at the wind farm. In this study, we modeled 20 MW class Seongsan wind farm which has 10 wind turbines located at the eastern part of Jeju Island. WindSim based on the computational fluid dynamics was adopted for the estimation of power generation. The power curve and thrust coefficient with meteorology file were prepared for wind farm modelling. The meteorology file was produced based on the measured data of the Korea Wind Atlas provided by Korea Institute of Energy Research. Three types of wake models such as Jensen, Larsen, and Ishihara et al. wake models were applied to investigate the wake effects. From the result, Jensen and Ishihara wake models show nearly the same value of power generation whereas the Larsen wake model shows the largest value. New positions of wind turbines are proposed to reduce the wake loss, and to increase the annual energy production of the wind farm.