• Title, Summary, Keyword: Distributed generations

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A Study on the Advanced Protective Coordination Schemes of Distribution System Considering Distributed Generations (분산전원을 고려한 배전계통의 개선된 보호협조 방안 연구)

  • Choi, Dong-Man;Choi, Joon-Ho;Moon, Seung-Il;Kim, Jae-Chul;Moon, Chae-Joo;Kim, Il-Soo
    • Proceedings of the KIPE Conference
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    • pp.701-703
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    • 2005
  • Recently, There has been growing interest in Distributed Generations with high-energy efficiency due to the Increasing energy consumption and environmental pollution problems. but an insertion of Distributed Generations to existing power distribution system can cause several problems such as voltage variations, harmonics, protective coordination, increasing fault current etc, because of reverse power. This paper was applied to Sukumar M[l] proposal schemes and identity the faulted section performing short-circuit analysis by MATLAB program to distribution systems interconnected a large number of distributed generations.

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Analysis of Transient Characteristics for Distributed Generations with the Secondary Feeders (저압배전선로에 연계된 분산전원의 과도특성 해석에 관한 연구)

  • Yoon, Gi-Gab;Rho, Dae-Seok;Kim, Eui-Hwan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.10
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    • pp.3898-3904
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    • 2010
  • In order to analyze the transient characteristics for distributed generation located with the secondary feeders, this paper constructs a Distributed Generations Filed Test Center which can produce transient characteristics such as voltage sag, swell, interruption, harmonic and so on. And also this paper proposes the test results for the interconnection of distributed generations. The results show the effectiveness for the utility technical guidelines for distributed generations with the secondary feeders.

Reliability Evaluation of Distributed Generation and Distribution System Using Load Duration Curve (Load Duration Curve를 이용한 분산전원과 배전계통의 신뢰도 산출)

  • Bae, In-Su;Kim, Jin-O
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.54 no.11
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    • pp.518-524
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    • 2005
  • This paper presents an analytical method for the reliability evaluation of distribution system, including the distributed generations. Unlike the large sized generations of transmission system, the distributed generations have complexities in analyzing and determining the operation. In the process of evaluate reliability, it can be shown that the analytical method is simpler than the Monte-Carlo simulation and the method using Load Duration Curve model is more accurate than that using peak load model. The modeling of distributed generation to analysis distribution system reliability using LDC is proposed in this Paper, and is compared with the MCS method as a result of case studies.

A Study on the Reliability Evaluation of Power Distribution System with Distributed Generations using Power Supplied Probability (전력공급확률을 이용한 분산형 전원을 고려한 배전계통 신뢰도 평가에 관한 연구)

  • Lee, Hee-Tae;Moon, Jong-Fil;Kim, Jae-Chul
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.12
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    • pp.2119-2124
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    • 2010
  • Reliability evaluation of power distribution system is the evaluation for all customers supplied from one power source as main transformer located in substation. However, power sources include not only the main transformer but distributed generations. Typical reliability evaluation has focused on configuration of power system with one source including failure rates of equipment. In this paper, we focus on not only configuration but power sources as distributed generations. New reliability evaluation method using power supplied probability (PSP) is proposed. The proposed evaluation method are proved through case studies.

Optimized Design and Coordinated Control for Stand-alone DC Micro-grid (독립형 DC 마이크로그리드의 최적화 설계와 협조적 제어)

  • Han, Tae-Hee;Lee, Ji-Heon;Kim, Hyun-Jun;Han, Byung-Moon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.1
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    • pp.63-71
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    • 2013
  • This paper describes the coordinated droop control method for stand-alone type DC micro-grid to improve reliability and utilization of distributed generations and energy storage. The stand-alone type DC micro-grid consists of several distributed generations such as a wind power generation, solar power and micro-turbine, and energy storage. The proposed method which is based on autonomous control method shows high reliability and stability through coordinated droop control of distributed generations and energy storage and also capability of battery management. The operation of stand-alone type DC micro-grid was analyzed using detail simulation model with PSCAD/EMTDC software. Based on simulation results, a hardware simulator was built and tested with commercially available components and performance of system was verified.

Droop Control to Compensate Load Voltage Unbalance for Inverter-based Distributed Generations with Unequal Impedance Lines (불균등 임피던스 선로를 갖는 인버터기반 분산전원의 부하전압 불평형을 보상하는 드룹 제어)

  • Yang, Won-Mo;Kim, Hyun-Jun;Han, Byung-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.7
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    • pp.1193-1203
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    • 2016
  • This paper proposes a droop control scheme to compensate the unbalanced line-to-line voltage of unbalanced 3-phase load which is coupled with two inverter-based distributed generations through unequal impedance lines. Unbalanced line-to-line load voltages occur due to using single-phase loads, which brings about bad effects on the coupled inverters and the distributed generations. In order to compensate the unbalanced line-to-line voltages, a positive sequence voltage control was used for sharing the active and reactive power and a negative sequence control was used for reducing the negative sequence voltage. The feasibility of the proposed scheme was first verified by computer simulations, and then experiments with a hardware set-up built in the lab. The experimental results were compared with the simulation results to confirm the feasibility of the proposed scheme.

Modeling of Distributed Generation to Calculate Reliability of Customers (수용가의 신뢰도 평가를 위한 분산전원 모델링)

  • Jo, Jong-Man;Bae, In-Su;Shim, Hun;Kim, Jin-O
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.19 no.8
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    • pp.70-76
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    • 2005
  • Unlike the large sized generations of transmission system, the distributed generations have complexities in analyzing and determining model. This paper resents an analytical method for the reliability evaluation of distribution system, including the distributed generations. The method using Load Duration Curve model is simpler than the Monte-Carlo Simulation and is more accurate than that using peak load model. The modeling of distributed generation to analysis reliability of customers using LDC is proposed in this paper, and is compared with the MCS method as a result of case studies.

Optimal Operation System of Step Voltage Regulator in Primary Feeders with Distributed Generations (분산전원이 연계된 고압배전선로에 있어서 선로전압 조정장치의 최적운용 평가시스템 개발)

  • Son, Joon-Ho;Heo, Sang-Won;Rho, Dae-Seok;Kim, Eui-Hwan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.6
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    • pp.2698-2706
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    • 2011
  • This paper deals with the optimal operation algorithm of SVR(Step Voltage Regulator) which is located with primary feeders and proposes the optimal operation system to evaluate customer voltage. The existing algorithm of SVR adapts the constant sending voltage method, which may cause the power quality problems such as overvoltage and under voltage variations in case where the distributed generations are interconnected with the primary feeders. Therefore, this paper proposes the optimal algorithm of LDC method for SVR using least square method to obtain the optimal setting values. Also, this paper presents the optimal evaluation system based on the former algorithm. The simulation results according to the types and capacities of distributed generations shows the effectiveness.

Estimation of the Generating Power for Distributed Generations Interconnected with Distribution Networks (배전 계통에 연계된 분산전원의 발전량 예측 알고리즘)

  • Choi, Don-Man;Jang, Sung-Il;Kim, Kwang-Ho
    • Proceedings of the KIEE Conference
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    • pp.327-330
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    • 2003
  • This paper proposes an estimation algorithm for the generating power of distributed generations(DG) interconnected with distribution networks. These days, DG are rapidly increasing and most of them are interconnected with distribution networks. The DG can supply power into the distribution network, which may make significant impact on fault current and the protection scheme of the interconnected distribution networks. Generally these influences of DG is proportioned as the distributed generator's power. Therefore, it is important to forecast the output power of distributed generator in PCC(point of common coupling). This paper presents the prediction method of DG's power by monitoring the current and phase difference.

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Development of intelligent distribution automation system with the function of substation SCADA, power quality monitoring and diagnosis condition monitoring (SCADA 기능과 전기품질 온라인 감시 및 배전설비 열화감시 기능을 갖는 배전지능화 시스템 개발)

  • Ha, B.N.;Lee, S.W.;Shin, C.H.;Seo, I.Y.;Jang, Mun-Jong;Park, M.H.;Yun, G.G.;Song, I.K.;Lee, B.S.;Lee, J.C.;NamKoong, W.
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.10
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    • pp.1776-1786
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    • 2010
  • Intelligent distribution automation system have total monitoring and control capability. The system covers substation, distribution network, distributed generations and customers at HV system. Various intelligent distribution facilities installed at distribution systems have voltage sensor, current sensor, aging monitoring sensor. Intelligent Feeder Remote Terminal Unit (IFRTU) tied to intelligent distribution facilities process information from facilities and it checks information of fault, power quality and aging of distribution facilities. The information is transmitted to master station through communication line. The master station have remote monitoring system covers substation, distribution network, distributed generations and customers. It also have various application programs that maintain optimal network operation by using information from on-site devices.