• Title/Summary/Keyword: Load Leveling

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A Case Study on Operation of Energy Management System Connected with Renewable Energy (신재생에너지 연계형 에너지관리장치의 운영 사례 연구)

  • Cho, Jai Young;Ra, In-Ho
    • Smart Media Journal
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    • v.7 no.2
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    • pp.71-77
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    • 2018
  • This paper proposes the components of the energy management system (EMS) for optimum operation of renewable energy and associated energy storage system (ESS), the functions to be considered in designing, the analysis of operational effects, and finally the reduction of electricity costs. To accomplish the objectives, a lithium-ion battery system and an energy management system have installed in a PV system, and it presents the results analyzed with operation data for a year. To increase the system operation efficiency, we propose the effect that EMS is used to replace the demand power at the peak time with the charge power at the light load time, which suggests the influence of contributing to the charge benefit and load leveling according to the ESS tariff.

A Study on the Decision of Appropriate Subsidy Levels Regarding Electric Vehicles for V2G as Load Management Resources (V2G 전기자동차의 부하관리 자원 활용을 위한 적정 지원금 산정에 관한 연구)

  • Kim, Jung-Hoon;Hwang, Sung-Wook
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.2
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    • pp.264-268
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    • 2016
  • Recently, various energy efficiency optimization activities are ongoing globally by integrating conventional grids with ICT (Information and Communication Technology). In this sense, various smart grid projects, which power suppliers and consumers exchange useful informations bilaterally in real time, have been being carried out. The electric vehicle diffusion program is one of the projects and it has been spotlighted because it could resolve green gas problem, fuel economy and tightening environmental regulations. In this paper, the economics of V2G system which consists of electric vehicles and the charging infrastructure is evaluated comparing electric vehicles for V2G with common electric vehicles. Additional benefits of V2G are analyzed in the viewpoint of load leveling, frequency regulation and operation reserve. To find this benefit, electricity sales is modeled mathematically considering depth of discharge, maximum capacity reduction, etc. Benefit and cost analysis methods with the modeling are proposed to decide whether the introduction of V2G systems. Additionally, the methods will contribute to derive the future production and the unit cost of electric vehicle and battery and to get the technical and economic analysis.

A Study on the DSM Effect of a Refrigerant-Subcooling Refrigeration System with an Ice Storage Tank (축열조를 이용한 냉매과냉각 시스템의 전력수요관리 효과에 대한 연구)

  • Kim, Jeong-bae;Lee, Eun-Ji;Lee, Dong-Won
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.22 no.12
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    • pp.845-851
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    • 2010
  • This study was experimentally performed to find the effects of refrigerant subcooling in the refrigeration system and to propose how to get the efficient use of energy. A refrigerant-subcooling refrigeration system consisted of a typical single vapor-compression refrigeration cycle, a subcooler, and an ice storage tank. The degree of subcooling at the exit of the condenser can be increased by the heat transfer between the subcooler and the ice storage tank. The cold heat in the ice storage tank was stored by using the refrigeration cycle during night time and then used to absorb the heat from the subcooler during daytime. The cooling capacity and COP of this system were higher than those of the conventional system due to the increase in the degree of subcooling. Typically, the refrigerant-subcooling system showed superior performance to the conventional refrigeration system and would also contribute to load leveling.

Grid-Connected Peak Load Compensation System Based on Lithium Polymer Battery Energy Storage System

  • Jung, Doo-Yong;Ji, Young-Hyok;Lee, Su-Won;Won, Chung-Yuen;Seo, Kwang-Duk;Jung, Yong-Chae
    • Proceedings of the KIPE Conference
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    • 2009.11a
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    • pp.265-267
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    • 2009
  • we proposed a grid connected peak load compensation system with high discharge current characteristics based on lithium polymer battery for development of the next generation power-station. The lithium polymer battery has faster discharge current characteristics than conventional battery, so that can compensate high active power demanded by load in a short time using the low capacity battery bank. Therefore, it is possible to control power leveling of grid by measuring storage energy of battery and active power which is needed from load. The validity of proposed system was verified through the simulation and experiment.

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The research on supporting method of electric peak management for building facilities of heating and cooling (건물냉난방설비관련 전력피크관리사업 지원방안 연구)

  • Yang, Seung-Kwon;Lee, Han-Byul
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2008.10a
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    • pp.379-382
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    • 2008
  • This paper gives the support method of DSM program(power load leveling for heating and cooling facilities on building). As the national power peak load increases recently, the peak load reduction is needed. So we studied about remote controlling of power load from heating/cooling facilities on building during peak times. To adopt new DSM program, it is very important to design DSM customer supporting system. So in this paper, we dealt with the result of customer survey, and the DSM potential regarding heating/cooling facilities on building. In conclusion, the peak reduction program of heating/cooling facilities is very important and the incentive of customer should be consist of two incentive types as an installation and power reduction.

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Analysis of Electricity Cost Saving Effect by the Optimal load shifting Operation with 1MWh Redox Flow Battery (1MWh급 레독스흐름전지의 부하이전용 최적운전에 따른 전기요금 절감효과 분석)

  • Baek, Ja-Hyun;Ko, Eun-Young;Kang, Tae-Hyuk;Lee, Han-Sang;Cho, Soo-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.7
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    • pp.1151-1160
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    • 2016
  • In recent years, the energy storage systems such as LiB, NaS, RFB(Redox-Flow Battery), Super- capacitor, pumped hydro storage, flywheel, CAES(Compressed Air Energy Storage) and so on have received great attention as practical solutions for the power supply problems. They can be used for various purpose of peak shaving, load leveling and frequency regulation, according to the characteristics of each ESS(energy storage system). This paper will focus at 1 MWh RFB system, which is being developed through the original technology project of energy material. The output of ESS is mainly characterized by C-rate, which means that the total rated capacity of battery will be delivered in 1 hour. And it is a very important factor in the ESS operation scheduling. There can be several options according to the operation intervals 15, 30 and 60minutes. The operation scheduling is based on the optimization to minimize the daily electricity cost. This paper analyzes the cost-saving effects by the each operating time-interval in case that the RFB ESS is optimally scheduled for peak shaving and load leveling.

Study for Loading Characteristic of Tilting Mechanism on Korea Tilting Train (II) - Adjustmemt for Interface of carbody and Bogie (한국형틸팅열차 틸팅기구장치 부하특성 평가 연구(II) - 대차/차체 인터페이스 조정에 의한 정적부하 영향분석)

  • Ko, Tae-Hwan;Lee, Wang-Sang;Lee, Bum-Sang
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.951-956
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    • 2011
  • As the evaluation of loading characteristic on tilting mechanism is the most important one of the function test of tilting mechanism, the changing characteristic of load must be investigated on tilting of carbody for both the static and running condition of train. In this study, we reduced the load of tilting mechanism by adjusting the interface of carbody and bogie such as the weight balance, level of underframe, height of leveling valve, height of axle box and center position of tilting actuator with the characteristic curve of load for optimal condition of the tilting mechanism obtained in the previous study. Furthermore, the factor and effect of the interfacial structures respecting the load of tilting mechanism was evaluated by analyzing the changing characteristic of load obtained in the process of adjustment of interfaces. From these data, we will propose the maintenance standards for interfacial structures and tilting mechanism in order to minimize the load of tilting mechanism by analyzing in detail the characteristic of load for the main factors of the interfacial structure effecting on the load of tilting mechanism.

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Battery Energy Storage Based Voltage and Frequency Controller for Isolated Pico Hydro Systems

  • Singh, Bhim;Rajagopal, V.
    • Journal of Power Electronics
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    • v.9 no.6
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    • pp.874-883
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    • 2009
  • This paper deals with an integrated voltage and frequency (VF) controller for isolated asynchronous generators (IAG) driven by a constant power pico-hydro uncontrolled turbine feeding three-phase four-wire loads. The proposed VF controller is used to control the frequency and voltage of an IAG with load leveling. Such a VF controller is also known as an integrated electronic load controller (IELC) which is realized using an isolated star/polygon transformer with a voltage source converter (VSC) and a battery at its DC bus. The proposed generating system with a VFC is modeled and simulated in MATLAB along with Simulink and Simpower system (SPS) toolboxes. The simulated results are presented to demonstrate the performance of an isolated asynchronous generator feeding three-phase four-wire loads with neutral current compensation.

Development of Centralized controller with remote control and hydraulic lift (고소작업차의 원격 제어를 포함한 중앙집중식 컨트롤러 및 유압식 상승리프트 개발)

  • Lee, Sang-Sik;Kim, Jun-Tae;Park, Won-Yeop
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.10 no.3
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    • pp.232-241
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    • 2017
  • This study was carried out to design the stable elements of the aerial work machinery used in the orchard and farmland which had been conducted in the previous research. A hydraulic lifting lift has been developed to work safely at irregular and inclined locations using an auto leveling system and a horizontal sensor. The development of a centralized controller including remote control has been carried out in order to control the elevated work platform. Through the developed module, we carried out on-site test run to check whether the control is stable in the elevation workbench. Through the structural analysis of the elevation workbench, the maximum load and the equal load amount that the worker can safely work on the workbench are presented.

The Stack Design Considering The Reactive Power Supply of Grid-Connected Inverter (계통 연계형 인버터의 무효전력 공급을 고려한 Stack 설계)

  • Koh, Kwang-Soo;Oh, Pil-Kyoung;Kim, Hee-Jung;Kim, Young-Min
    • Proceedings of the KIPE Conference
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    • 2016.07a
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    • pp.453-454
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    • 2016
  • The ESS(Energy Storage System) connected with distributed generation is drawing attention due to improving the quality load leveling, peak shaving for enhancing reliability of the power grid. The grid-connected inverter makes frequency adjustment to the active power's charge discharge according to the load variation. In addition, the inverter is possible to act as a reactive power compensation device to eliminate harmonic operates as power factor change inhibiting, anti-transient voltage fluctuation, active filter. In this paper, we propose a design method of igbt stack considering the reactive power supply capacity to improve the quality and reliability of the inverter. Moreover, the grid-connected inverter considering the four-quadrant rated operation designed stack and verified the feasibility of the design through a thermal analysis.

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