• 전기학회논문지
• /
• 제67권7호
• /
• pp.854-859
• /
• 2018

This paper describes the characteristics of a hybrid supercapacitor module for power quality stabilization. Hybrid supercapacitor is an promising energy storage device that positioned between conventional EDLC and Li-ion battery. A cylindrical 7500F hybrid supercapacitor ($60{\times}138mm$) was assembled by using the $Li_4Ti_5O_{12}$ electrode as an anode and activated carbon as a cathode. Considering the ESR and efficiency has been designed to module with 41.6F 480V design results in 180 series combination. In order to determine the characteristics of the hybrid supercapacitor module for power system, hybrid supercapacitor cells were connected in series with active balancing circuit. As a result of measuring the 50kw UPS, it was discharged at the current of 104A~143A during the discharge in the voltage range of 350V~480V, and the compensation time at discharge was measured to be about 30s. These results can be used to stabilization of power quality by applying hybrid supercapacitor module.

• 드라이브 ㆍ 컨트롤
• /
• 제17권3호
• /
• pp.15-25
• /
• 2020

The cycle time and power saving effect of a hydraulic hybrid injection molding machine using a servo motor are considered in this paper. In order to verify control characteristics, such as pressure and speed, experiments were performed with the hydraulic hybrid injection molding machine, clamping force of 110 ton. The power consumption and production cycle time of a conventional hydraulic injection molding machine were measured to compare its performances with the hydraulic hybrid injection molding machine. An injection molding machine with a clamping force of 1300 ton was used as the conventional machine, the hybrid machine was implemented by replacing its induction motors with servo motors. In the remodeled hybrid machine, experiments were performed to investigate how the displacement of the mold clamping pump affects the power consumption and production cycle time. The results showed that the production cycle time of the hybrid injection molding is similar to a conventional hydraulic injection molding machine but with a significant energy saving of about 40%.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2007년도 제38회 하계학술대회
• /
• pp.545-546
• /
• 2007

A hybrid system that uses a parallel combination of wind turbine and fuel cell is modeled. Wind energy source is characterized by its intermittent and variable nature. The output power generated by the fuel cell is stable and can be properly controlled. Therefore, fuel cell system can be added to the wind turbine system for the purpose of ensuring continuous power flow. Fuel cell helps to compensate power and regulate the frequency in power system. Simulation results show the effect of the hybrid system on power regulation. The excess power generated by the wind turbine was directed to an electrolyzer to generate hydrogen and the power deficit was compensated by the fuel cell.

• 한국전자통신학회논문지
• /
• 제18권2호
• /
• pp.269-276
• /
• 2023

본 연구에서는 1시간 이상 체공이 가능하도록 드론에 적용하기 위한 하이브리드 동력시스템을 제안한다. 이 동력시스템은 발전기에서 발생되는 교류를 다이오드 브리지 회로를 통해 직류로 변환하여 배터리를 충전시키고 동력시스템의 높은 제어성능을 얻기 위하여 분리된 셀을 갖는 배터리시스템을 사용한다. 본 논문에서는 부하별 연비와 출력을 분석하였으며, 또한 선정된 발전기의 성능을 연구하였다. 제안된 하이브리드 동력시스템을 장착한 드론은 중량 대비 출력 비율이 0.82로 계산되었으며, 비행시간은 4,179초 동안 비행하였다.

• 전기전자학회논문지
• /
• 제23권3호
• /
• pp.826-831
• /
• 2019

소형 독립형 태양광 전원장치는 조명장치, CCTV 등에 많이 활용되고 있다. 이러한 장치가 경쟁력을 가지기 위해서는 배터리와 같은 전력저장장치 수명이 매우 중요하다. 하이브리드 커패시터는 고밀도와 장수명의 장점을 가지고 있다. 본 논문에서는 하이브리드 커패시터를 이용한 독립형 태양광 전원장치를 제안한다. 전력변환장치의 구성하기 위해 하이브리드 커패시터의 충방전 특성 및 내부저항을 측정하였다. 일사량 변화에도 안정적인 최대 출력점 추종제어 알고리즘을 제시하였다. 제시한 시스템의 타당성을 검증하기 위해 18W의 하이브리드 커패시터와 10W태양광 전지를 이용하여 시제품을 제작하고 실험하였다.

• 한국항해항만학회지
• /
• 제35권8호
• /
• pp.637-641
• /
• 2011

해양구조물 전력시스템은 독립형 전력체계를 구축하기 어렵다. 그러므로 해상용 전력시스템을 효과적으로 운영하기 위하여 연료전지 및 하이브리드 전력체계를 연동한 전력시스템을 구축하는 것이 중요하다. 본 연구에서는 연료전지 기반의 해양구조물용 전력체계 설계에 필요한 수소 발생 메카니즘, 사용 전력량 계산과정 등을 기초로 해상용 연료전지 기반의 전력체계를 설계하고, 설계된 전력 시스템을 LabVIEW 프로그램을 활용하여 시뮬레이션 및 분석하였으며, 이를 기반으로 해양구조물용 전력시스템 설계 방안을 제안하고자 한다.

• 신재생에너지
• /
• 제9권4호
• /
• pp.3-12
• /
• 2013

This paper proposes the hybrid fuel cell system that can solve disadvantages of existing fuel cell system and ensure high reliability and high stability. The system consists of PEM fuel cell, Ni-MH battery and power management system. In this system, when the power provided from the fuel cell is higher than the load power, the extra energy may be used to charge the Ni-MH battery. When the fuel cell can not provide enough energy to the load, the shortage of energy will be supplied by the Ni-MH battery. Experimental results show that the output voltage is regulated well during load variations. Also, high system efficiency is achieved.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2005년도 춘계학술대회
• /
• pp.361-365
• /
• 2005

Since the fuel cell uses the hydrogen for its fuel. it has no emission and higher efficiency than an internal combustion engine. Also fuel cell is much quieter than engine generator and generates heat much less than engine generator. So it has advantage of Army's 'si lent watch' capability and the ability to operate undetected by the enemy. The fuel cell hybrid system combines a fuel cell power system with an ESS. The ESS (e.g., batteries or ultracapacitors) reduces the fuel cell's peak power and transient response requirements. It allows the fuel cell to operate more efficiently and recovery of vehicle energy during deceleration. The battery has high energy density, so it has the advantage regarding driving distance. However, it has a disadvantage considering dynamic characteristic because of low power density. One other hand. the ultracapacitor has higher power density, so it can handle sudden change or discharge of required power. Yet. it has lower energy density. so it will be bigger and heavier than the battery when it has the same energy. This paper proposes the power management strategy for multi-power source fuel cell hybrid system. which is applied with the merits of both battery and ultra capacitor by using both of them simultaneous.

• International Journal of Automotive Technology
• /
• 제8권6호
• /
• pp.771-780
• /
• 2007

In recent studies, various types of multi mode electric variable transmissions of hybrid electric vehicles have been proposed. Multi mode electric variable transmission consists of two or more different types of planetary gear hybrid powertrain system(PGHP), which can change its power flow type by means of clutches for improving transmission efficiencies. Generally, the power flows can be classified into three different types such as input split, output split and compound split. In this study, we analyzed power transmission characteristics of the possible six input split systems, and found the suitable system for single or multi mode hybrid powertrain. The input split system used in PRIUS is identified as a best system for single mode, and moreover we identified some suitable systems for dual mode.

• Journal of Power Electronics
• /
• 제3권3호
• /
• pp.145-150
• /
• 2003

Reliability, availability, and cost have been the major concerns for photovoltaic hybrid systems since their beginning as primary sources for much critical applications like communication units and repeaters. This paper descnbes the performance of two hybrid systems, photovoltaic-battery, wind-turbine coupled with the public-grid (PVBWG) hybrid system and photovoltaic-battery, wind-turbine coupled With the diesel generator (PVBWD) hybrid system The systems are sized to power a typical 300W/48V de telecommunication load continuously throughout the year Such hybrid systems consist of subsystems, which in turn consist of components Failure of anyone of these components may cause failure of the entire system. The reliability and availability basics, and estimation procedure for the two proposals are introduced also in this paper. The PVBWG and PVBWD system configurations are shown with the relevant mean-time-between-faIlure (MTBF) and failure rate (${\lambda}$) of each component. The characteristics equations of the two systems are deduced as a function of operating hours and the percentage of sun and wind availabilities per day. The system probability failure as well as the reliability is estimated based on the fault tree analysis technique. The results show that, by using standard or normal components MTBF, the PVBWG is more reliable and the time of periodic maintenance period is more than one year especially in the rich sites of both sun and wind, but PVBWD competes else Also, in the first five years from the system installation, the system is quit reliable and may not require any maintenance. The results show also, as the sun and wind are available, as the system reliable and available.