• 제목/요약/키워드: Hybrid Grid System.

검색결과 198건 처리시간 0.011초

계통연계형 풍력, 태양광 및 축전지 하이브리드 시스템의 출력제어 및 동특성 해석 (Power Control and Dynamic Performance Analysis of a Grid-Interactive Wind/PV/BESS Hybrid System)

  • 김슬기;전진홍;조창희;안종보
    • 전기학회논문지
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    • 제56권2호
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    • pp.317-324
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    • 2007
  • Most conventional hybrid systems using renewable energy sources have been applied for stand-alone operation, but Utility-interface may be an useful and viable option for hybrid systems. Grid-connected operation may have benefits such as reduced losses in power system distribution, utility support in demand side management, and peak load shaving. This paper addresses power control and dynamic performance of a grid-connected PV/wind/BESS hybrid system. At all times the PV way and the wind turbine are individually controlled to generate the maximum energy from given weather conditions. The battery energy storage system (BESS) charges or discharges the battery depending on energy gap between grid invertger generation and production from the PV and wind system. The BESS should be also controlled without too frequently repeated shifts in operation mode, charging or discharging. The grid inverter regulates the generated power injection into the grid. Different control schemes of the grid inverter are presented for different operation modes, which include normal operation, power dispatching, and power smoothing. Simulation results demonstrate that the effectiveness of the proposed power control schemes for the grid-interactive hybrid system.

지속가능성을 고려한 산악지역 독립망 전력시스템의 신재생 에너지원 구성 전략 (Formation Strategy of Renewable Energy Sources for High Mountain Off-grid System Considering Sustainability)

  • 안성훈;이경태;반다리 비나약;이길용;이선영;송철기
    • 한국정밀공학회지
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    • 제29권9호
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    • pp.958-963
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    • 2012
  • Characteristics of off-grid hybrid renewable energy sources for high mountain villages are discussed. Considering reliability of electric power generation, Photovoltaic (PV)-wind hybrid and PV-hydro hybrid system are suggested. Connecting two or more villages with these hybrid systems, an extended hybrid off-grid can be formed. Sustainability of entire system is important in design of off-grid system, and income generation of the village people using the electricity should be considered.

HYBRID기법과 QUICKER기법 : 공동 유동의 계산 특성 비교 (HYBRID Scheme vs. QUICKER Scheme : Comparison Based on Lid-driven Cavity flow Computations)

  • 조성호;강인준;박승오
    • 대한기계학회논문집
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    • 제17권6호
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    • pp.1640-1647
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    • 1993
  • 본 연구에서는 속도-압력 연계방법으로는 SIMPLE기법을 적용하고, 비균일 격자계에서도 사용할 수 있는 QUICKER방법과 함께 HYBRID방법을 이용하여 이와 같은 물음에 대한 대답을 구하고자 하였다. 이를 위하여 수치적 실험을 위한 흐름으로 본 연구에서 선택한 정사각형 공동 흐름 (square cavity flow)은 재순환 유동의 수치 적 해법을 위한 표준유동으로 많이 사용되어 왔으며, 대한기계학회 전산유체분과에서 도 여러 수치기법을 비교평가 하기 위한 흐름으로 채택된 적이 있는 흐름이다.

태양광 계통연계형 하이브리드 변압기의 해석 및 성능시험 (Analysis and Performance Test of Hybrid Transformer used in the Grid-Connected Photovoltaic Generation System)

  • 김지호;박훈양;손진근
    • 전기학회논문지P
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    • 제63권4호
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    • pp.333-338
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    • 2014
  • This paper concerns the development of the transformer that can reduce harmonics supplied to the system if the output of photovoltaic inverter in the photovoltaic system is grid-connected, and suggests that problems of harmonics and power factor degradation in the grid-connected photovoltaic system can be improved. In this study, the burden of increasing the investment in new facilities and securing their installation space due to harmonics has been substantially eased through the development of a hybrid transformer possessing unbalanced function and harmonics reduction function using zig-zag coils, and most of all, it is expected that the development of such high efficiency hybrid transformer possessing functions of transformation and reducing harmonics can improve the power quality as well as prevent damages caused by harmonics, leading to suppress unnecessary loss of electric power and thereby contribute to energy savings.

PC-Based Hybrid Grid Computing for Huge Biological Data Processing

  • Cho, Wan-Sup;Kim, Tae-Kyung;Na, Jong-Hwa
    • Journal of the Korean Data and Information Science Society
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    • 제17권2호
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    • pp.569-579
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    • 2006
  • Recently, the amount of genome sequence is increasing rapidly due to advanced computational techniques and experimental tools in the biological area. Sequence comparisons are very useful operations to predict the functions of the genes or proteins. However, it takes too much time to compare long sequence data and there are many research results for fast sequence comparisons. In this paper, we propose a hybrid grid system to improve the performance of the sequence comparisons based on the LanLinux system. Compared with conventional approaches, hybrid grid is easy to construct, maintain, and manage because there is no need to install SWs for every node. As a real experiment, we constructed an orthologous database for 89 prokaryotes just in a week under hybrid grid; note that it requires 33 weeks on a single computer.

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Improved Control Strategy Based on Space Vectors for Suppressing Grid-Side Current Harmonics in Three-Phase Current Source Rectifiers with a Hybrid Switch

  • Xu, Yan;Lu, Guang-Xiang;Jiang, Li-Jie;Yi, Gui-Ping
    • Journal of Power Electronics
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    • 제15권2호
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    • pp.497-503
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    • 2015
  • This paper analyses the harmonic pollution to power grids caused by several high-power rectifiers, summarizes the requirements for rectifiers in suppressing grid-side current harmonics and optimizes a new-type of current source PWM rectifier with a hybrid switch. The rectifier with a hybrid switch boasts significant current characteristics and cost advantages in the high-power area. To further enhance the working frequency of the current source rectifier with a hybrid switch for suppressing grid-side harmonics and reducing the inductance size, this paper proposes an optimal control strategy based on space vector. It also verifies that the optimal control strategy based on space vector can reduce the total harmonic distortion of the grid-side current of the rectifier with a hybrid switch via circuit simulation and experimental results.

스마트그리드를 위한 신재생에너지원과 하이브리드시스템 모델링 (Renewable Source and Hybrid System Modeling for Smart Grid)

  • 조재훈;홍원표;전명근
    • 조명전기설비학회논문지
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    • 제24권12호
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    • pp.109-121
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    • 2010
  • Recently, smart grid for solving energy problems have been receiving growing attention. Also, renewable energy sources such as photovoltaic and fuel cell as future energy for realizing smart grid have been widely studied. On the other hand, hybrid structures have been proposed since the output power of these renewable energy sources is usually dependent on weather conditions. This paper proposes a hybrid system involving a proper photovoltaic in the hybrid system, Polymer Elecrolyte Membrane Fuel Cell with water electrolyzer and ultracapacitor. The results of simulation and output of the proposed model are established and analysed by Matlab/Simulink and SimPowerSystems.

Techno-Economic Optimization of a Grid-Connected Hybrid Energy System Considering Voltage Fluctuation

  • Saib, Samia;Gherbi, Ahmed;Kaabeche, Abdelhamid;Bayindir, Ramazan
    • Journal of Electrical Engineering and Technology
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    • 제13권2호
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    • pp.659-668
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    • 2018
  • This paper proposes an optimization approach of a grid-connected photovoltaic and wind hybrid energy system including energy storage considering voltage fluctuation in the electricity grid. A techno-economic analysis is carried out in order to minimize the size of hybrid system by considering the benefit-cost. Lithium-ion battery type is used for both managing the electricity selling to the grid and reducing voltage fluctuation. A new technique is developed to limit the voltage perturbation caused by the solar irradiance and the wind speed through determining the state-of-charge of battery for every hour of a day. Improved particle swarm optimization (PSO) methods, referred to as FC-VACPSO which combines Fast Convergence Particle Swarm Optimization (FCPSO) method and Variable Acceleration Coefficient Based Particle Swarm Optimization (VACPSO) method are used to solve the optimization problem. A comparative study has been performed between standard PSO method and PSO based methods to extract the best size with the benefit cost. A sensitivity analysis has been studied for different kinds and costs of batteries, by considering variable and constant state-ofcharge of battery. The simulations, performed under Matlab environment, yield good results using the FC-VACPSO method regarding the convergence and the benefit cost of the hybrid system.

빌딩마이크로그리드시스템용 하이브리드에너지시스템 전력제어 및 운영 (Power control and operation of Hybrid Energy System for Building Micro-Grid)

  • 조재훈;홍원표
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2009년도 추계학술대회 논문집
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    • pp.37-41
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    • 2009
  • In this paper, we propose to research the possibility of using a photovoltaic system and supercapacitor combined with a high speed microturbine. This hybrid energy system work as atand-alone mode or grid-connected mode as it will be a part of building micro-grid. Simple dynamic models of photovoltaic, microturbine systems and supercapacitor banks are proposed. their models are developed by Matlab/Simulink tool. Two important results are carried out to find power control effectiveness in case of with supercapacitor bank and without one. At least, simulation results show the effectiveness on the power control at AC busbar of hybrid energy system as building micro-grid system.

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Vibration analysis of functionally graded material (FGM) grid systems

  • Darilmaz, Kutlu
    • Steel and Composite Structures
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    • 제18권2호
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    • pp.395-408
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    • 2015
  • The paper considers the free vibration analysis of FGM grid systems. Up to now, very little work has been done on this type of system and the paper aspires to fill this gap. Based on the hybrid-stress finite element formulation free vibration solutions for FGM grid systems of various aspect ratios, different types of gradations functions, and support conditions are determined. The tabulation of these results, not available thus far, should be useful to designers and researchers who may use them.