• 전기학회논문지
• /
• 제56권10호
• /
• pp.1763-1769
• /
• 2007

To improve the cycle-life and efficiency of an energy storage system for HEV, a dynamic control system consisted of a switch between a battery and an ultracapacitor module is proposed, which is appropriate for mild hybrid vehicle with 42V power net. The switch can be controlled based on the status of the battery and the ultracapacitor module, and a control algorithm that could largely decrease the number of high charging current peak is also implemented. Therefore the cycle life of the battery can be improved such that it is suitable for a mild hybrid vehicle with frequent engine start-stop and regenerative-braking. Also, by maximizing the use of the ultracapacitor, the system efficiency during high current charging and discharging operation is improved. Finally, this system has the effects that improves the efficiency of energy storage system and reduces the fuel consumption of a vehicle. To verify the validity of the proposed system, this paper presented cycles test results of different energy storage systems: a simple VRLA battery, hybrid energy Pack (HEP, a VRLA battery in Parallel with Ultracapacitor) and a HEP with a switch that controlled by energy management system (EMS). From the experimental result, it was proved the effectiveness of the algorithm.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2009년도 하계학술대회 논문집
• /
• pp.477-477
• /
• 2009

Bimodal Tram developed by KRRI is driven by a series Hybrid propulsion system which has both the CNG engine, generator and LPB(Lithium Polymer Battery) pack. It has three driving modes; Hybrid mode, Engine mode and Battery mode. Even in case of Battery mode, LPB pack to get enough power to drive the vehicle only by itself onsists of 168 LPB cells(80Ah per lcell), 650V. It is important thing to manage LPB pack in a right way, which will extend the lifetime of LPB cells and operate in the hybrid mode effectively. This paper has shown the development of battery management system(12 BMS, 1 BMS per 14cells) to manage LPB pack which is connected with CAN(Controller Area Network) each other and measure the voltage, current, temperature and also control the cooling fan inside of LPB pack. Using the measured data, BMS can show the SOC(State of Charge), SOH(State of Health) and other status of LPB pack including of the cell balancing.

• International Journal of Computer Science & Network Security
• /
• 제22권3호
• /
• pp.355-363
• /
• 2022

This paper presents the modeling for islanded hybrid AC/DC microgrid and the verification of the proposed supervisory controller for energy management for this microgrid. The supervisory controller allows the microgrid system to operate in different power flows through the proposed control algorithm, it has several roles in the management of the energy flow between the different components of the microgrid for reliable operation. The proposed microgrid has both essential objectives such as the maximum use of renewable energies resources and the reduction of multiple conversion processes in an individual AC or DC microgrids. The microgrid system considered for this study has a solar photovoltaic (PV), a wind turbine (WT), a battery (BT), and a AC/DC loads. A small islanded hybrid AC/DC microgrid has been modeled and simulated using the MATLAB-Simulink. The simulation results show that the system can maintain stable operation under the proposed supervisory controller when the microgrid is switched from one operating mode of energy flow to another.

• 전기학회논문지
• /
• 제61권12호
• /
• pp.1791-1800
• /
• 2012

This paper presents effective design schemes for a photovoltaic (PV) and battery hybrid system that includes state-of-the-art technologies such as maximum power point tracking scheme for PV arrays, an effective charging/discharging circuit for batteries, and grid-interfacing power inverters. Compared to commonly-used PV systems, the proposed configuration has more flexibility and autonomy in controlling individual components of the PV-battery hybrid system. This paper also proposes an intelligent coordination scheme for the components of the PV-battery hybrid system to improve the efficiency of renewable energy resources and peak-load management. The proposed algorithm is based on a rule-based expert system that has excellent capability to optimize multi-objective functions. The proposed configuration and algorithms are investigated via switching-level simulation studies of the PV-battery hybrid system.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1991년도 추계학술대회 논문집 학회본부
• /
• pp.47-50
• /
• 1991

This paper discusses a knowledge-based system being developed by KAIST and KEPCO to assist planning the annual maintenance schedule of power units. To meet users' requirements, we have designed the system with several features: man-machine interaction, catalog system, user-friendliness, the hybrid-system of math-model and knowledge-base. In this paper, we introduce the outline of our system.

• Journal of Advanced Marine Engineering and Technology
• /
• 제35권3호
• /
• pp.335-340
• /
• 2011

Building energy saving is one of the most important issues in these days. Control algorithm for energy saving should be designed properly to reduce power consumption in building. Recently, building energy system consists of hybrid energy system coupling with RE (Renewable Energy) source. In this paper, an optimum control algorithm for building energy saving is applied to BEMS (Building Energy Management System) by using an outdoor air temperature prediction strategy. BEMS coupling with renewable energy can control HVAC (Heating, Ventilating and Air-Conditioning) system effectively. In order to verify the effectiveness of building energy saving, BEMS was tested for several months at a laboratorial chamber with an air conditioner, fan and heater. To this end BEMS embedded control algorithm has been tested successfully.

• Journal of Electrical Engineering and Technology
• /
• 제11권2호
• /
• pp.353-360
• /
• 2016

Series hybrid electric vehicles (SHEVs) having multiple power sources such as an engine- generator (EnGen), a battery, and an ultra-capacitor require a power control unit with high power density and reliable control operation. However, manufacturing using separate individual power converters has the disadvantage of low power density and requires a large number of power and signal cable wires. It is also difficult to implement the optimal power distribution and fault management algorithm because of the communication delay between the units. In order to address these concerns, this approach presents a design methodology and a power control algorithm of an integrated power converter for the SHEVs powered by multiple power sources. In this work, the design methodology of the integrated power control unit (IPCU) is firstly elaborately described, and then efficient and reliable power distribution algorithms are proposed. The design works are verified with product-level and vehicle-level performance experiments on a 10-ton SHEV.

• 한국자동차공학회논문집
• /
• 제19권6호
• /
• pp.113-118
• /
• 2011

Fuel Cell Hybrid Vehicle (FCHV) is one of the most promising candidates for the next generation of transportation. It has many outstanding advantages such as higher energy efficiency and much lower emissions than internal combustion engine vehicles. It also has the ability of recovering braking energy. In order to design an FCHV drive train, we need to determine the size of the electric motor, the Fuel Cell System (FCS), and the battery. In this paper, the methodology for the sizing of these components is introduced based on the driveability constraints of the FCHV. A power management strategy is also presented because the battery energy capacity depends on it. The warm-up time of the FCS is also considered in the power management strategy and the simulation result is compared to that without considering the warm-up time.

• 한국전자통신학회논문지
• /
• 제18권1호
• /
• pp.205-212
• /
• 2023

현대사회는 화석연료 등의 사용으로 기후변화로 인한 기상이변이 전 세계가 이례적인 피해가 속출하고, 코로나와 같은 전염병이 인간에게 더욱 생활의 질이 악화되고 있는 실정이다. 온실가스를 줄이고 신재생에너지 사용이 시급한 현실이다. 화석연료의 사용을 줄이고 신재생에너지 사용으로 지구환경 오염을 줄이고자 한다. 본 논문에서는 태양광을 이용해 지능형 CCTV 및 인터넷 WiFi, 냉난방 시스템을 통한 사계절 환경과 안전 및 통신 기능이 가능하고, 스마트폰 앱을 통한 태양광의 생산량과 소비량을 실시간으로 모니터링하여 최적화된 전력관리를 할 수 있는 시스템을 제안한다. 태양광 발전 시스템을 사용할 수 없는 한파, 태풍, 자연재해 등의 계통 정전과 같은 비상시 끊김 없는 디젤 발전을 지원하는 하이브리드 발전시스템을 제안한다.

• 한국정보통신학회논문지
• /
• 제21권7호
• /
• pp.1455-1463
• /
• 2017

세계경기가 저성장, 저소비, 높은 실업률, 고위험, 짧은 호황 긴 불황 등을 기록하고 있다. 이에 따라 해운경기가 하락하여 선박 유지비용의 절감이 불가피해지고 있다. 이를 위해 그린 선박, 에코 선박, 스마트 선박과 같은 선박의 에너지를 절감하기 위한 연구가 활발히 진행 중에 있다. 친환경 선박에서 배터리를 사용하는 전력관리시스템은 중요한 연구분야 중 하나이다. 본 논문에서는 발전기만을 사용하는 일반적인 선박의 전력관리시스템의 중부하 제어를 분석하고 배터리 연계형 전력관리시스템에서 중부하를 제어하는 알고리즘을 연구하였다. 이를 위해 배터리 연계형 전력관리시스템의 구성을 제안하고 제안된 시스템을 기반으로 배터리 연계형 전력 시뮬레이터를 구성하였다. 구성된 시뮬레이터를 통해 배터리 연계형 전력관리시스템에서 중부하 제어에 따른 배터리의 동작을 정의하고 이를 확인하였다.