• 제목/요약/키워드: Output Energy

검색결과 2,818건 처리시간 0.037초

신재생에너지산업의 경제적 파급효과 분석 (A Study on the Economic Effects of Renewable Energy Industry)

  • 권승문;김하나;전의찬
    • 한국기후변화학회지
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    • 제7권1호
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    • pp.59-68
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    • 2016
  • The world's major countries have focused on the renewable energy industry as the solution to climate change and the energy crisis. Nevertheless, there are no studies on the economic effects of the renewable energy industry. This study analyzed the economic effects of Korea's renewable energy industry by using the 2010 Input-Output Table. It is estimated that Korea's renewable energy industry made a production-induced effect of 2.0262 won, and a value-added-induced effect of 0.6138 won through an increase in output growth of 1 won, and an employment-induced effect of 2.3046 labors through an increase in output growth of 1 billion won. Both the effect ratio and the response ratio were greater than 1, which means the renewable energy industry is an intermediate manufacturing industry whose forward linkage effect and backward linkage effects are large. These results show differences with previous studies that classified electricity sector and renewable energy industry into final primary production industries. It is expected that the economic effects of the renewable energy industry will become greater in the future. Therefore, research on statistics related to the renewable energy industry is needed for more precise analysis.

에너지저장장치 및 STATCOM을 이용한 풍력발전시스템의 출력제어 기법 (Power Output Control of Wind Generation System Through Energy Storage System and STATCOM)

  • 김종율;박준호
    • 전기학회논문지
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    • 제59권10호
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    • pp.1718-1726
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    • 2010
  • Utilization of renewable energy is becoming increaingly important from the viewpoints of environmental protection and conservation of fossil fuel. However, the generating power of renewable energy is always fluctuating due to the environmental status. This paper presents a scheme for supervisory control of wind generation system with the energy storage and STATCOM to reduce the power variation. In this paper, we especially concentrate on constant power output control of wind generation system. In order to achieve this purpose, the coordinated control strategy between different types of energy storage system and reactive power compensation device. The proposed control scheme has been validated by PSCAD/EMTDC simulation. As a result, the proposed scheme can handle the power output of wind generation system with a constant value.

Output performance enhanced triboelectric nanogenerator with gear train support

  • Kim, Wook;Hwang, Hee Jae;Choi, Dukhyun
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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    • pp.415.2-415.2
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    • 2016
  • Triboelectric nanogenerator (TENG) is one of ways to convert mechanical energy sound, waves, wind, vibrations, and human motions to available electrical energy. The principal mechanism to generate electrical energy is based on contact electrification on material surface and electrostatic induction between electrodes. The performance of TENG are dependent on amount of the input mechanical energy and characteristics of triboelectric materials. Furthermore, the whole TENG system including mechanical structure and electrical system can effect on output performance of TENG. In this work, we investigated the effect of gear train on output performance and power conversion efficiency (PCE) of TENG under a given input energy. We applied the gear train on mechanical structure to improve the contact rate. We measured the output energy under a constant input energy by controlling the size of the working gear. We prepared gears with gear ratios (rin/rw) of 1, 1.7, and 5. Under the constant input energy, the voltage and current from our gear-based TENG system were enhanced up to the maximum of 3.6 times and 4.4 times, respectively. Also, the PCE was increased up to 7 times at input frequency of 1.5 Hz. In order to understand the effect of kinematic design on TENG system, we performed a capacitor experiment with rectification circuit that provide DC voltage and current. Under the input frequency of 4.5 Hz, we obtained a 3 times enhanced rectifying voltage at a gear ratio of 5. The measured capacitor voltage was enhanced up to about 8 fold in using our TENG system. It is attributed that our gear-based TENG system could improve simultaneously the magnitude as well as the generation time of output power, finally enhancing output energy. Therefore, our gear-based TENG system provided an effective way to enhance the PCE of TENGs operating at a given input energy.

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A Supercapacitor Remaining Energy Control Method for Smoothing a Fluctuating Renewable Energy Power

  • Lee, Wujong;Cha, Hanju
    • Journal of Electrical Engineering and Technology
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    • 제10권1호
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    • pp.146-154
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    • 2015
  • This paper proposes a control method for maintaining the energy level for a supercapacitor energy storage system coupled with a wind generator to stabilize wind power output. Although wind power is green and clean energy source, disadvantage of the renewable energy output power is fluctuation. In order to mitigate the fluctuating output power, supercapacitor energy storage system (SCESS) and wind power simulator is developed. A remaining energy supercapacitor (RESC) control is introduced and analyzed to smooth for short-term fluctuating power and maintain the supercapacitor voltage within the designed operating range in the steady as well as transient state. When the average and fluctuating component of power increases instantaneously, the RESC compensates fluctuating power and the variation of fluctuating power is reduced 100% to 30% at 5kW power. Furthermore, supercapacitor voltage is maintained within the operating voltage range and near 50% of total energy. Feasibility of SCESS with RESC control is verified through simulation and experiment.

Analysis of losses within SMES system for compensating output fluctuation of wind power farm

  • Park, S.I.;Kim, J.H.;Le, T.D.;Lee, D.H.;Kim, D.J.;Yoon, Y.S.;Yoon, K.Y.;Kim, H.M.
    • 한국초전도ㆍ저온공학회논문지
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    • 제16권4호
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    • pp.57-61
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    • 2014
  • Output fluctuation which is generated in wind power farm can hinder stability of total power system. The electric energy storage (EES) reduces unstable output, and superconducting magnetic energy storage (SMES) of various EESs has the proper performance for output compensation of wind power farm since it charges and discharges large scale power quickly with high efficiency. However, because of the change of current within SMES, the electromagnetic losses occur in the process of output compensation. In this paper, the thermal effect of the losses that occur in SMES system while compensating in wind power farm is analyzed. The output analysis of wind power farm is processed by numerical analysis, and the losses of SMES system is analyzed by 3D finite element analysis (FEA) simulation tool.

연료전지/축전지 복합 동력원 연계 성능 해석 (Performance Analysis of fuelcell/Battery Hybrid vehicles)

  • 이봉도;이원용;한수빈;신동열
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 G
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    • pp.3141-3143
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    • 1999
  • Fuel cell systems offer high energy efficiencies for transportation application. In addition, they can use alcohols and alternative fuels as the fuel, while producing little or no noxious emissions. Fuel cell-powered energy source should be competitive in performance characteristics and in capital and maintenance costs with internal combustion engine systems. From computer simulation program, battery and fuel cell energy output and total power profile, motor power, battery energy output, fuel cell energy output. It simulates the performance of fuelcell/battery powered energy source operation over any user inputted transit route cycle, and provides performance criteria through user specifications for preliminary design consideration.

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에너지 전환에 의한 동축 섬광관 펌핑 Rhodamine 6G 색소 레이저의 출력 증가 (Output Enhancement of Coaxial Flashlamp Pumped Rhodamine 6G Dye Laser by Energy Transfer)

  • 장우권
    • 한국광학회지
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    • 제4권2호
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    • pp.195-199
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    • 1993
  • Rh-6G(Rhodamine 6G)를 주색소로 하고 C-545(Coumarin 545)를 첨가색소로 하는 펄스형 혼합 색소레이저의 출력을 조사하였다. 동축형의 섬광관을 펌핑 광원으로 이용하였으며 Rh-6G 단일 색소로 발진할 경우 전기 입력 에너지가 346 J 일 때 첨두 출력과 에너지는 각각 27kW, 59mJ이었다. Rh-6G의 흡수 스펙트럼과 일치하는 형광 스펙트럼을 갖는 C-545를 에서지 주개로 선택하였다. Rh-6G의 농도를 최적 농도인 $1{\times}10_-4mol/l$로 고정하고 C-545의 농도를 $1{\times}10_7mol/l$부터 변화시키면서 혼합 색소에 대한 레이저의 출력 특성을 조사하였다. C-545의 농도가 Rh-6G 농도의 0.4%일 때 출력 에너지는 약 70% 증가하였다.

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Cantilever형 바이몰프 압전소자의 출력특성에 관한 연구 (A Study on the Output Characteristics for the Cantilever Piezoelectric Bimorph)

  • 김용혁
    • 전기학회논문지
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    • 제59권3호
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    • pp.581-587
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    • 2010
  • Using piezoelectric elements to harvest energy from ambient vibrations has been of great interest over the past few years. Due to the relatively low power output of piezoelectric materials, there are many study to improve the energy harvesting efficiencies. This paper is study the efficiencies of the output energy considering the cantilever piezoelectric bimorph using aluminum vibration beam. when the length of vibration beam and the piezoelectric body becomes same and the maximum output power comes out. DC voltage was increased as the beam thickness and vibration frequency was increased. The vibration beam was able to achieve very large energy value.

COT 제어 플라이벅 컨버터를 위한 전압 리플 보상회로의 분석 및 설계 (Analysis and Design for Ripple Generation Network Circuit in Constant-on-Time-Controlled Fly-Buck Converter)

  • 조영훈;장바울
    • 전력전자학회논문지
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    • 제27권2호
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    • pp.106-117
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    • 2022
  • Multiple output converters can be utilized when various output voltages are required in applications. Recently, one of the multiple output converters called fly-buck has been proposed, and has attracted attention due to the advantage that multiple output can be easily obtained with a simple structure. When constant on-time (COT) control is applied, the output ripple voltage must be treated carefully for control stability and voltage regulation characteristics in consideration of the inherent energy transfer characteristics of the fly-buck converter. This study analyzes the operation principle of the fly-buck converter with a ripple generation network and presents the design guideline for the improved output voltage regulation. Validity of the analysis and design guideline is verified using a 5 W prototype of the COT controlled fly-buck converter with a ripple generation network for telecommunication auxiliary power supply.

신재생에너지 모델링을 위한 풍력 및 태양광 발전 출력 패턴 상관관계 분석 (Correlation Analysis of Wind and Solar Power Generation Pattern for Modeling of Renewable Energy)

  • 김민정;박영식;박종배;노재형
    • 전기학회논문지
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    • 제60권10호
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    • pp.1823-1831
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    • 2011
  • When the RPS(Renewable Portfolio Standards) becomes effective in 2012, the use of renewable energy will be dramatically increased. However, there are no production simulations and demand supply programs that reflect the characteristics of the renewable energy. This paper analyzes correlations of the domestic wind power and solar power generation pattern in different areas and those of these sources' output and load pattern. Based on the regional correlation analysis, an appropriate method that uses a average output of the renewable energy or another modeling that takes account of uncertainty could be selected. Because it's output is dependent on weather condition, we can not control the generation of renewable energy, that is the reason why the correlation between the load and output pattern of sources can be helpful to determine whether the renewable energy is modeled as a generator or load modifier. Through this analysis, a basis will be provided in order to properly model the renewable energy source.