본문 바로가기
HOME> 저널/프로시딩 > 저널/프로시딩 검색상세

저널/프로시딩 상세정보

권호별목차 / 소장처보기

H : 소장처정보

T : 목차정보

International journal of electrical power & energy... 71건

  1. [해외논문]   Editorial Board   SCIE


    International journal of electrical power & energy systems v.99 ,pp. ii - ii , 2018 , 0142-0615 ,

    초록

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  2. [해외논문]   Dynamic reconfiguration of three-phase unbalanced distribution networks   SCIE

    Zhai, H.F. (Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University), Ministry of Education, Jinan 250061, China ) , Yang, M. (Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University), Ministry of Education, Jinan 250061, China ) , Chen, B. (Energy Systems Division, Argonne National Laboratory, Argonne, IL 60439, USA ) , Kang, N. (Energy Systems Division, Argonne National Laboratory, Argonne, IL 60439, USA)
    International journal of electrical power & energy systems v.99 ,pp. 1 - 10 , 2018 , 0142-0615 ,

    초록

    Abstract The increasing penetration of distributed generations (DGs) and variable loads introduces significant power fluctuations to distribution networks, rendering conventional reconfiguration strategies ineffective. In the context of an active distribution network (ADN), remote control switches can be operated in real time through a centralized control scheme. Therein the distribution network topology can be configured in a flexible and dynamic manner capable of adapting to time-varying load demand and DG output. This paper presents a dynamic reconfiguration approach for a three-phase unbalanced distribution network. The ADN topology is optimized for the look-ahead time periods and is adaptive to the time-varying load demand and DG output while minimizing the daily power loss costs. To improve the calculation efficiency, several linearization methods are introduced to formulate the dynamic reconfiguration as a mixed-integer linear programming problem, which can be effectively solved using off-the-shelf solvers. The effectiveness of the proposed approach is verified by the test results obtained on a modified IEEE 34 node test feeder. Highlights A novel dynamic DNR approach of unbalanced distribution networks is proposed. The model considers the time-varying nature of loads and DG output. The model considers the three-phase voltage imbalance and power imbalance. Several linearizing methods are used to convert the DNR problem into a MILP model.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  3. [해외논문]   A new approach to voltage management in unbalanced low voltage networks using demand response and OLTC considering consumer preference   SCIE

    Rahman, Md Moktadir (School of Engineering and Information Technology, Murdoch University, WA 6150, Australia ) , Arefi, Ali (School of Engineering and Information Technology, Murdoch University, WA 6150, Australia ) , Shafiullah, G.M. (School of Engineering and Information Technology, Murdoch University, WA 6150, Australia ) , Hettiwatte, Sujeewa (School of Engineering, National School of Business Management (NSBM), Homagama, Sri Lanka)
    International journal of electrical power & energy systems v.99 ,pp. 11 - 27 , 2018 , 0142-0615 ,

    초록

    Abstract Voltage unbalance and magnitude violations under normal operating conditions have become main power quality problems in many low voltage (LV) distribution networks. Maintaining the voltage level in an LV network within the standard limits is the main constraining factor in increasing the network hosting ability for rooftop photovoltaic (PV). This study presents a new effective method for voltage management in unbalanced distribution networks through the implementation of optimal residential demand response (DR) and on-load tap changers (OLTCs). The proposed method minimises the compensation costs of voltage management (cost of DR and network loss), while prioritises the consumer consumption preferences for minimising their comfort level violations. A modified particle swarm optimisation algorithm (MPSO) is utilised to identify the optimal switching combination of household appliances and OLTC tap positions for the network voltage management. The proposed method is comprehensively examined on a real three-phase four-wire Australian LV network with considerable unbalanced and distributed generations. Several scenarios are investigated for improving the network voltage magnitude and unbalance considering individual and coordinated operations of DR and OLTCs (three phase tap control and independent phase tap control). Simulation results show that the coordinated approach of DR and OLTC, especially, DR integrated with OLTC independent phase tap control effectively improves the network voltage and increases the PV hosting capacity. Highlights This paper formulates a voltage management technique for unbalanced LV networks. Demand response (DR) integrated with on-load tap changing (OLTC) is formulated. Consumer consumption preferences and bidding cost are included in the formulation. The optimum switching settings of household appliances and OLTC tap are identified.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  4. [해외논문]   A comprehensive framework for optimal day-ahead operational planning of self-healing smart distribution systems   SCIE

    Hosseinnezhad, Vahid (Faculty of Electrical and Computer Engineering, Shahid Beheshti University, A.C., Tehran, Iran ) , Rafiee, Mansour (Faculty of Electrical and Computer Engineering, Shahid Beheshti University, A.C., Tehran, Iran ) , Ahmadian, Mohammad (Faculty of Electrical and Computer Engineering, Shahid Beheshti University, A.C., Tehran, Iran ) , Siano, Pierluigi (Department of Industrial Engineering, University of Salerno, Fisciano, Italy)
    International journal of electrical power & energy systems v.99 ,pp. 28 - 44 , 2018 , 0142-0615 ,

    초록

    Abstract Providing a cost-efficient and sustainable energy is one of the critical features in modern societies. In response to this demand, this paper proposes a comprehensive framework for optimal day-ahead operational planning of smart distribution systems considering both normal and emergency conditions. The proposed procedure for normal mode minimizes the operation costs and provides sustainability using the seamlessness index. By adjusting this index, the system can be adapted to achieve the desired self-sufficiency level along a specified planning horizon thanks to exploiting the sufficient local generations. The operational planning of emergency mode is integrated into the proposed framework to provide the optimal schemes which can handle the possible abnormal conditions using the available local generations and guarantee the desired resiliency level. In emergency mode, the proposed self-healing strategy will sectionalize the isolated area of the distribution system into island partitions to provide reliable power supply to the critical loads continuously. A set of key operational metrics including power loss, load priority, and system-related constraints are integrated into the proposed island partitioning procedure which promotes the functionality of the method. The proposed framework is implemented on a modified PG&E 69-bus distribution system and is investigated through different case studies. The results of case studies demonstrate significant improvements and benefits which are obtained by applying the proposed framework. Highlights A comprehensive framework for optimal operational planning of smart distribution systems. A management model control the self-sufficiency level of system. A self-healing strategy based on the island partitioning to restore maximum consumers. Metrics are integrated in the proposed island partitioning method.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  5. [해외논문]   Cyber security of a power grid: State-of-the-art   SCIE

    Sun, Chih-Che (School of Electrical Engineering and Computer Science, Washington State University, Pullman WA, 99164, USA ) , Hahn, Adam (School of Electrical Engineering and Computer Science, Washington State University, Pullman WA, 99164, USA ) , Liu, Chen-Ching (School of Electrical Engineering and Computer Science, Washington State University, Pullman WA, 99164, USA)
    International journal of electrical power & energy systems v.99 ,pp. 45 - 56 , 2018 , 0142-0615 ,

    초록

    Abstract The integration of computing and communication capabilities with the power grid has led to numerous vulnerabilities in the cyber-physical system (CPS). This cyber security threat can significantly impact the physical infrastructure, economy, and society. In traditional IT environments, there are already abundant attack cases demonstrating that unauthorized users have the capability to access and manipulate sensitive data from a protected network domain. Electric power grids have also heavily adopted information technology (IT) to perform real-time control, monitoring, and maintenance tasks. In 2015, a sophisticated cyber attack targeted Ukrainian’s power grid causing wide area power outages. It highlights the importance of investment on cyber security against intruders. This paper provides a state-of-the-art survey of the most relevant cyber security studies in power systems. It reviews research that demonstrates cyber security risks and constructs solutions to enhance the security of a power grid. To achieve this goal, this paper covers: (1) a survey of the state-of-the-art smart grid technologies, (2) power industry practices and standards, (3) solutions that address cyber security issues, (4) a review of existing CPS testbeds for cyber security research, and (5) unsolved cyber security problems. Power grid cyber security research has been conducted at Washington State University (WSU) with a hardware-in-a-loop CPS testbed. A demonstration is provided to show how the proposed defense systems can be deployed to protect a power grid against cyber intruders. Highlights A review of cyber systems in a smart grid is provided with a list of the communication standards. Requirements for cyber security and industry practice are discussed. The state-of-the-art cyber protection and cyber-physical system testbeds are summarized. The proposed methodology for detection of coordinated cyber attacks is demonstrated. Unsolved cyber vulnerabilities that require future research are described.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  6. [해외논문]   Electrical machines-based multi-disturbance device for testing distribution grid technologies   SCIE

    Merino, Julia (TECNALIA, Spain ) , Veganzones, Carlos (Universidad Politécnica de Madrid, Spain ) , Á (ORKESTRA, Fundación Deusto, Spain ) , lvaro-Hermana, Roberto (Information Processing and Telecommunications Center, Universidad Politécnica de Madrid, Spain) , Fraile-Ardanuy, Jesú , s
    International journal of electrical power & energy systems v.99 ,pp. 57 - 68 , 2018 , 0142-0615 ,

    초록

    Abstract The growth of distributed energy resources in power systems, mainly converter-coupled generators, has forced the evolution of grid codes, increasing the requirements to be fulfilled by the generators before their connection to the mains. Solving this problem is crucial to guarantee the reliability and stability of the power system. Current standards force the generators to remain connected when facing voltage and/or frequency disturbances and, in some advanced grid codes, also when the generators are facing transient phase jumps produced as a consequence of those disturbances. If considering that the increment of the distributed generation is mainly done at a distribution level, it is unrealistic to consider voltage and frequency events as decoupled phenomena in the testing and certification procedures, as it is currently done. The testing device proposed in this paper is able to reproduce voltage, frequency and phase jumps disturbances of a controlled value simultaneously, being able to reproduce the real grid behavior reliably. Its design is based on standard components with a simple control system, which makes it easily replicable and scalable up to the power of the device to be tested. Therefore, the proposed device is an interesting commercially competitive testing equipment suitable for certification. Highlights Novel testing device for distribution grid technologies’ certification. Able to reproduce voltage, frequency and controlled phase jumps simultaneously. Managed by a simple control system to make it easily handy by the user. Scalable and based on standardized machines to be commercially competitive.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  7. [해외논문]   An improved DIM interface algorithm for the MMC-HVDC power hardware-in-the-loop simulation system   SCIE

    Li, Guoqing (Department of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China ) , Jiang, Shouqi (Department of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China ) , Xin, Yechun (Department of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China ) , Wang, Zhenhao (Department of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China ) , Wang, Lixin (Department of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China ) , Wu, Xueguang (Global Energy Interconnection Research Institute, Changping District, Beijing 102209, China ) , Li, Xue (Department of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China)
    International journal of electrical power & energy systems v.99 ,pp. 69 - 78 , 2018 , 0142-0615 ,

    초록

    Abstract Power hardware-in-the-loop (PHIL) simulation has become the crucial means of research on modular multilevel converter based high voltage direct current (MMC-HVDC) devices. To deal with the stability and accuracy problems caused by the power interface, an improved damping impedance method (DIM) interface algorithm is proposed by real-time impedance matching in this paper. The trapezoidal integration method is used to disperse the sub-module capacitance, and the turn-off resistance of power device is set to infinity to simplify the calculation process of MMC equivalent impedance, which can realize the efficient impedance matching for the DIM. Moreover, based on the voltage signal reconstructed by a dq coordinate transformation, a time delay compensation control method is proposed for the uncertain interface delay to improve the accuracy of the PHIL simulation. To verify the excellent stability and accuracy performance of the improved DIM, the characteristics of the reference system, DIM and ideal transformer model (ITM) interface systems are compared by digital simulation. The start-up strategy of a practical MMC-HVDC PHIL test platform is designed, and the effectiveness and feasibility of the proposed methods are verified by simulation experiments. Highlights An improved DIM interface algorithm for MMC-HVDC PHIL simulation is proposed. A time delay compensation control method is proposed for interface delay. The start-up strategy of a practical MMC-HVDC PHIL test platform is designed. The effectiveness of the improved DIM is verified by simulation experiments.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  8. [해외논문]   Effect of an additional large disturbance during power swings on the impedance seen by the out-of-step blocking function   SCIE

    Sorrentino, Elmer (Universidad Simón Bolívar, Caracas, Venezuela ) , Navas, Greta (Universidad Simón Bolívar, Caracas, Venezuela ) , Orea, Emar (Centro Nacional de Despacho, Caracas, Venezuela)
    International journal of electrical power & energy systems v.99 ,pp. 79 - 84 , 2018 , 0142-0615 ,

    초록

    Abstract This short article analyzes the effect of an additional large disturbance during power swings on the apparent impedances seen by the out-of-step blocking function of a distance relay. An additional large disturbance during power swings can imply a sudden change of the apparent impedance, which should be considered for the setting of out-of-step functions. The goal of this article is to describe this phenomenon, which has not been previously shown in the literature. A Venezuelan case is taken as an example, and the analyzed additional large disturbance is due to the operation of a special protective scheme for the islanding of one specific area. Maximization of the region between concentric characteristics and minimization of correspondent setting time can be useful actions to improve the expected behavior of out-of-step blocking functions. However, these actions are insufficient for the analyzed example, and two non-traditional solutions were proposed. In general, as these additional large disturbances could fortuitously occur when the apparent impedance is near of the trip region, the logical proper solution should be provided by future improvements of the algorithms from relay manufacturers. Highlights Major events during power swings can cause sudden changes of apparent impedances. This effect should be considered for setting the out-of-step blocking function. A Venezuelan case is taken as an example to show this effect. Conventional corrective actions could be insufficient to solve the problem. In the future, relay manufacturers could consider this effect in their algorithms.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  9. [해외논문]   Markov Chain Monte Carlo simulation of electric vehicle use for network integration studies   SCIE

    Wang, Yue (Ellison Building, Northumbria University, Newcastle upon Tyne NE1 8ST, UK ) , Infield, David (Department of Electronic and Electrical Engineering, University of Strathclyde, 204 George Street, Glasgow G1 1XW, UK)
    International journal of electrical power & energy systems v.99 ,pp. 85 - 94 , 2018 , 0142-0615 ,

    초록

    Abstract As the penetration of electric vehicles (EVs) increases, their patterns of use need to be well understood for future system planning and operating purposes. Using high resolution data, accurate driving patterns were generated by a Markov Chain Monte Carlo (MCMC) simulation. The simulated driving patterns were then used to undertake an uncertainty analysis on the network impact due to EV charging. Case studies of workplace and domestic uncontrolled charging are investigated. A 99% confidence interval is adopted to represent the associated uncertainty on the following grid operational metrics: network voltage profile and line thermal performance. In the home charging example, the impact of EVs on the network is compared for weekday and weekend cases under different EV penetration levels. Highlights Markov Chain Monte Carlo simulation are verified to capture and simulate the vehicle use pattern. Markov Chain diagram of vehicle state transitions is improved from previous works. Uncertainty analyses for the network impact study bring confidence to network planning and operation. Grid operational metrics analysed here are voltage profile and line thermal characteristic. Case studies of uncontrolled charging at workplace and home are carried out.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  10. [해외논문]   DT based intelligent predictor for out of step condition of generator by using PMU data   SCIE

    Aghamohammadi, Mohammad Reza (Corresponding author.) , Abedi, Morteza
    International journal of electrical power & energy systems v.99 ,pp. 95 - 106 , 2018 , 0142-0615 ,

    초록

    Abstract Rotor angle instability of synchronous generators following large disturbances is regarded as a major threat for system dynamic security. Fast detection of out of step condition and disconnection of unstable generator is a vital requirement for avoiding any mechanical and thermal damage to the generator. In this paper, for early prediction of out of step condition of an unstable generator, a three stage decision tree based approach consisting of Fault Detector DT (FDDT), Clearance Detector DT (CDDT) and Instability Predictor DT (IPDT) is presented. The proposed approach by using a moving time window consisting of on line sampling vector data acquired by PMU, at the first and second stages detects the occurrence and clearance of the fault by FDDT and CDDT respectively. Then at the third stage IPDT will be activated for predicting out of step condition. The input data to each DT is a moving time window consisting of six consecutive sampling vector data. The nature of data used for FDDT and CDDT are electrical variables while the data used for IPDT is post fault mechanical variables of generator like angle, speed and acceleration of rotor. The proposed algorithm can be used as an out of step relay which could be trained and designed for each specific generator with respect to any fault or abnormal condition which threat generator stability. The proposed algorithm is demonstrated on generators of IEEE 39bus test system with promising result. Highlights For predicting out of step of synchronous generator a new approach is proposed. A three stages decision tree based scheme is proposed for predicting out of step. The proposed scheme mainly relies on the post fault data for predicting out of step. The proposed scheme is also able to detect fault occurrence and fault clearance. The proposed scheme is able to detect out of step due to unsymmetrical fault.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지

논문관련 이미지