• Title/Summary/Keyword: Peak operation

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Development of Operation Scenarios by HILS for the Energy Storage System Operated with Renewable Energy Source (HILS를 이용한 신재생 에너지원이 포함된 에너지 저장시스템의 운영 시나리오 개발)

  • Shin, Dong-Cheol;Jeon, Jee-Hwan;Park, Sung-Jin;Lee, Dong-Myung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.2
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    • pp.224-232
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    • 2018
  • According to government policy, renewable energy facility such as solar power generation is being implemented for newly constructed buildings. In recent years, the introduction of Energy Storage System (ESS) served as an emergency power for replacing an existing diesel generator has been increasing. Furthermore, in order to expand the efficacy of the ESS operation, operation in combination with renewable energy sources such as solar and wind power generation is increasing. Hence, development of the ESS operation algorithms for emergency mode as well as the peak power cut mode, which is the essential feature of ESS, are necessary. The operational scenarios of ESS need to consider load power requirement and the amount of the power generation by renewable energy sources. For the verification of the developed scenarios, tests under the actual situation are demanded, but there is a difficulty in simulating the emergency operation situation such as system failure in the actual site. Therefore, this paper proposes simulation models for the HILS(Hardware In the Loop Simulation) and operation modes developed through HILS for the ESS operated with renewable energy source under peak power reduction and emergency modes. The paper shows that the ESS operation scenarios developed through HILS work properly at the actual site, and it verifies the effectiveness of the control logic developed by the HILS.

Output Characteristics of Peak-Cut Saver System with Energy Storage Device (에너지 저장장치를 갖는 피크컷 세이버 시스템의 출력특성 연구)

  • Seo, Hyou-Uk;Han, D.H;Lee, Y.J;Chun, T.W;Choe, Gyu-Ha
    • Proceedings of the KIPE Conference
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    • 2011.11a
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    • pp.231-232
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    • 2011
  • It is very important thing to efficiently utilize the solar power. The conventional solar power system has no energy storage device. So the conventional system cannot cut the peak load. In this paper, the solar power system with the energy storage device and the operation algorithm of peak cut function was proposed to cut the peak load. The algorithm principle is proposed based on the insolation curve and load curve. The simulation and experiment was performed to demonstrate the validity of the peak cut algorithm.

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Negative Differential Resistance Devices with Ultra-High Peak-to-Valley Current Ratio and Its Multiple Switching Characteristics

  • Shin, Sunhae;Kang, In Man;Kim, Kyung Rok
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.13 no.6
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    • pp.546-550
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    • 2013
  • We propose a novel negative differential resistance (NDR) device with ultra-high peak-to-valley current ratio (PVCR) by combining pn junction diode with depletion mode nanowire (NW) transistor, which suppress the valley current with transistor off-leakage level. Band-to-band tunneling (BTBT) Esaki diode with degenerately doped pn junction can provide multiple switching behavior having multi-peak and valley currents. These multiple NDR characteristics can be controlled by doping concentration of tunnel diode and threshold voltage of NW transistor. By designing our NDR device, PVCR can be over $10^4$ at low operation voltage of 0.5 V in a single peak and valley current.

Peak Power Optimization for Metro Railway using by Source Impedance Control (전원 임피던스 제어를 통한 도시철도 최대전력 최적화)

  • Kim, Han-Su;Kwon, Oh-Kyu
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.6
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    • pp.841-849
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    • 2014
  • Urban railway with rectifiers is connected by parallel circuits because substations are joined by the power rail. Thus, if an input voltage of a substation is increased, then the voltage of rectifiers is also increased, and which leads to an increase in the peak power of the substation. To solve this problem, this paper proposes a new method reducing the peak power of substations by adjusting the operation number of rectifiers. Its feasibility is exemplified by some simulations performed for Incheon subway Line 1 and GA(Genetic Algorithm) method has been applied to obtain the optimal input. Simulation results show that peak power can significantly be reduced using the method proposed in this paper.

Study for Power Management System using Regenerative Energy in Electric Railway Systems (회생에너지를 이용한 도시철도 전력관리시스템 구축에 관한 연구)

  • Lee, Hansang;Cho, Yoonsung;Kim, Hyungchul;Jung, Hosung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.1
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    • pp.191-196
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    • 2014
  • For the large scale of electricity consumer, since the price for the electricity consumption depends on the peak power, the issue for peak power reduction have been being studied widely. Electric railway systems, which is one of the most representative large scale of loads, also has assignment to reduce the peak power since they have high peak power and low energy consumption load characteristics. In the aspect of the economic operation through reduction of peak power, this paper proposes a novel algorithm for power management system in electric railway systems using energy storage.

Double Peak Current Limiting Properties of Series Connection-Type SFCL with Two Magnetic Paths (두 개의 자속경로를 갖는 직렬연결형 초전도한류기의 이중 피크전류제한 특성)

  • Ko, Seok-Cheol;Han, Tae-Hee;Lim, Sung-Hun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.7
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    • pp.62-68
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    • 2014
  • We proposed a series connection-type superconducting fault current limiter(SFCL) using E-I core that can prevent the internal magnetic flux generation of cores during normal operation, and prevent the saturation of cores due to a sudden magnetic flux generation at the initial stage of fault occurrence while limiting the peak current. Through a short-circuit simulation experiment, we analyzed the operating status of the two superconducting elements and limiting characteristics according to the size of the fault current peak before and after the failure. Further, the double peak current limiting characteristics according to the winding directions as well as the current and the voltage of each coil were compared and analyzed.

Peak Load Compensation Control Method of 10kW Rapid charger for Electric Vehicle (V2G를 고려한 전기자동차용 충전기의 피크부하보상 제어 기법)

  • Choi, Seong-Chon;Choi, Ga-Gang;Jung, Doo-Young;Lee, Woo-Won;Lee, Su-Won;Won, Chung-Yuen
    • Proceedings of the KIPE Conference
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    • 2012.07a
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    • pp.150-151
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    • 2012
  • The utility grid has a supply of electric energy which is larger than the usually required power consumption under peak load condition. So, power distribution is required to have a heavy capacity because of peak-load period. To solve the problem, this paper proposes a 10kW rapid charger system which has a function of load compensation at the peak-load condition. The proposed system supplies power demanded by peak-load through transferring energy in the battery of electric vehicle to the grid. V2G operation is verified through simulation performed by 10kW rapid-charger.

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Development of Daily Operation Program of Battery Energy Storage System for Peak Shaving of High-Speed Railway Substations (고속철도 변전소 피크부하 저감용 ESS 일간 운전 프로그램 개발)

  • Byeon, Gilsung;Kim, Jong-Yul;Kim, Seul-Ki;Cho, Kyeong-Hee;Lee, Byung-Gon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.3
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    • pp.404-410
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    • 2016
  • This paper proposed a program of an energy storage system(ESS) for peak shaving of high-speed railway substations The peak shaving saves cost of equipment and demand cost of the substation. To reduce the peak load, it is very important to know when the peak load appears. The past data based load profile forecasting method is easy and applicable to customers which have relatively fixed load profiles. And an optimal scheduling method of the ESS is helpful in reducing the electricity tariff and shaving the peak load efficiently. Based on these techniques, MS. NET based peak shaving program is developed. In case study, a specific daily load profile of the local substation was applied and simulated to verify performance of the proposed program.

Optimal Operation Control for Energy Saving in Water Reuse Pumping System (에너지절감을 위한 물 재이용 펌프시스템의 최적운전 제어)

  • Boo, Chang-Jin;Kim, Ho-Chan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.5
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    • pp.2414-2419
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    • 2012
  • This paper presents an optimal operation control method for energy saving in the water reuse pumping system. A predictive horizon switching strategy is proposed to implement an optimal operation control and a linear programming (LP) algorithm is used to solve optimal problems in each time step. Energy costs are calculated for electricity on both TOU in the light, heavy, and maximum load time period and peak charges. The optimal operation in water reuse pumping systems is determined to reduce the TOU and peak costs. The simulation results show a power energy saving for water reuse pumping systems and power stability improvement.

Optimal Machine Operation Planning under Time-based Electricity Rates (시간대별 차등 전기요금을 고려한 최소비용 장비운용계획)

  • Kim, Inho;Ok, Changsoo
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.37 no.4
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    • pp.63-71
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    • 2014
  • As power consumption increases, more power utilities are required to satisfy the demand and consequently results in tremendous cost to build the utilities. Another issue in construction of power utilities to meet the peak demand is an inefficiency caused by surplus power during non-peak time. Therefore, most power company considers power demand management with time-based electricity rate policy which applies different rate over time. This paper considers an optimal machine operation problem under the time-based electricity rates. In TOC (Theory of Constraints), the production capacities of all machines are limited to one of the bottleneck machine to minimize the WIP (work in process). In the situation, other machines except the bottleneck are able to stop their operations without any throughput loss of the whole manufacturing line for saving power utility cost. To consider this problem three integer programming models are introduced. The three models include (1) line shutdown, (2) block shutdown, and (3) individual machine shutdown. We demonstrate the effectiveness of the proposed IP models through diverse experiments, by comparing with a TOC-based machine operation planning considered as a current model.