• 제목/요약/키워드: Output Energy

검색결과 2,818건 처리시간 0.024초

벌집형 압전 발전 소자의 구동방식에 따른 출력 특성 (A Study on the Generating Characteristics Depending on Driving System of a Honeycomb Shaped Piezoelectric Energy Harvester)

  • 정성수;강신출;박태곤
    • 한국전기전자재료학회논문지
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    • 제28권2호
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    • pp.69-74
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    • 2015
  • Recently, energy harvesting technology is increasing due to the fossil fuel shortages. Energy harvesting is generating electrical energy from wasted energies as sunlight, wind, waves, pressure, and vibration etc. Energy harvesting is one of the alternatives of fossil fuel. One of the energy harvesting technologies, the piezoelectric energy harvesting has been actively studied. Piezoelectric generating uses a positive piezoelectric effect which produces electrical energy when mechanical vibration is applied to the piezoelectric device. Piezoelectric energy harvesting has an advantage in that it is relatively not affected by weather, area and place. Also, stable and sustainable energy generation is possible. However, the output power is relatively low, so in this paper, newly designed honeycomb shaped piezoelectric energy harvesting device for increasing a generating efficiency. The output characteristics of the piezoelectric harvesting device were analyzed according to the change of parameters by using the finite element method analysis program. One model which has high output voltage was selected and a prototype of the honeycomb shaped piezoelectric harvesting device was fabricated. Experimental results from the fabricated device were compared to the analyzed results. After the AC-DC converting, the power of one honeycomb shaped piezoelectric energy harvesting device was measured 2.3[mW] at road resistance 5.1[$K{\Omega}$]. And output power was increased the number of harvesting device when piezoelectric energy harvesting device were connected in series and parallel.

Energy-efficient data transmission technique for wireless sensor networks based on DSC and virtual MIMO

  • Singh, Manish Kumar;Amin, Syed Intekhab
    • ETRI Journal
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    • 제42권3호
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    • pp.341-350
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    • 2020
  • In a wireless sensor network (WSN), the data transmission technique based on the cooperative multiple-input multiple-output (CMIMO) scheme reduces the energy consumption of sensor nodes quite effectively by utilizing the space-time block coding scheme. However, in networks with high node density, the scheme is ineffective due to the high degree of correlated data. Therefore, to enhance the energy efficiency in high node density WSNs, we implemented the distributed source coding (DSC) with the virtual multiple-input multiple-output (MIMO) data transmission technique in the WSNs. The DSC-MIMO first compresses redundant source data using the DSC and then sends it to a virtual MIMO link. The results reveal that, in the DSC-MIMO scheme, energy consumption is lower than that in the CMIMO technique; it is also lower in the DSC single-input single-output (SISO) scheme, compared to that in the SISO technique at various code rates, compression rates, and training overhead factors. The results also indicate that the energy consumption per bit is directly proportional to the velocity and training overhead factor in all the energy saving schemes.

Energy-Efficient Antenna Selection in Green MIMO Relaying Communication Systems

  • Qian, Kun;Wang, Wen-Qin
    • Journal of Communications and Networks
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    • 제18권3호
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    • pp.320-326
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    • 2016
  • In existing literature on multiple-input multiple-output (MIMO) relaying communication systems, antenna selection is often implemented by maximizing the channel capacity or the output single-to-noise ratio (SNR). In this paper, we propose an energy-efficient low-complexity antenna selection scheme for MIMO relaying communication systems. The proposed algorithm is based on beamforming and maximizing the Frobenius norm to jointly optimize the transmit power, number of active antennas, and antenna subsets at the source, relaying and destination. We maximize the energy efficiency between the link of source to relay and the link of relay to destination to obtain the maximum energy efficiency of the system, subject to the SNR constraint. Compared to existing antenna selection methods forMIMO relaying communication systems, simulation results demonstrate that the proposed method can save more power in term of energy efficiency, while having lower computational complexity.

Backsheet 반사율에 따른 Shingled Mini Module 출력변화에 대한 연구 (A Study on the Output Power of Shingled Mini Module Depending on Reflectance of Backsheets)

  • 조성현;문지연;손형진;전다영;김성현
    • Current Photovoltaic Research
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    • 제8권4호
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    • pp.129-133
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    • 2020
  • It is very important to optimize the reflectance of incident light in solar modules for improving output power and reducing loss of cell-to-module (CTM). It is assumed that a higher reflectance backsheet may improve optical efficiency. However how much output power is related to optical properties by reflectance property of backsheets have not been revealed clearly yet. A total of 3 types of industrial backsheets with 3 type of industrial encapsulants (EVA or POE) were analyzed as fabricated mini modules used shingled cells. According to the type of backsheets, the difference between the highest and lowest average reflectance in the range of 400 nm to 1200 nm was found to be 13.08% by UV-visible spectroscopy. Also, when using the same encapsulant, the maximum gap value of the output power increase was measured by about 3.755 mW% (166.02 mW). The correlation between reflectance and output power was experimentally found by measuring the output property of the fabricated shingled mini modules.

다결정 실리콘 태양광 모듈의 옥외 성능 평가 (Outdoor Performance Evaluation of Multi-Crystalline Silicon Photovoltaic Module)

  • 이유리;김우경;정재학
    • Current Photovoltaic Research
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    • 제7권3호
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    • pp.71-75
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    • 2019
  • Solar energy is one of the renewable energy sources. It can respond to expanding energy demand. A solar cell module is designed to have a durability that can be developed over a long period of 25 years to be installed outdoors and perform like a stable power supply. We need Standard Test Condition (STC)-based power output data before and after testing to measure the power output of existing modules. The modules are shown to reduce power output by comparing data before and after outdoor experiments regardless of whether they are indoor or outdoor. It is easy to compare the power output quantities through the module simulator in the indoor. However, it takes a lot of testing time and costs to compare the power output on outdoor in the case of a high number of modules and distance from the module simulator. It can save time and costs if we can check the power output using the data in outdoor. We have used the long-term outdoor test to find the elements out that corresponds to the reductions in power output quantities. We have conducted research that matched the actual and the tests.

풍력발전단지 출력보상용 하이브리드 에너지저장장치의 용량산정 (Determination of the Hybrid Energy Storage Capacity for Wind Farm Output Compensation)

  • 김승현;진경민;오성보;김일환
    • 한국태양에너지학회 논문집
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    • 제33권4호
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    • pp.23-30
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    • 2013
  • This paper presents the determination method of the hybrid energy storage capacity for compensating the output of wind power when disconnecting from the grid. In the wind power output compensation, a lot of charging and discharging time with lithium-ion battery will be deteriorated the life time. And also, this fluctuation will cause some problems of the power quality and power system stability. To solve these kind of problems, many researchers in the world have been studied with BESS(Battery Energy Storage System) in the wind farm. But, BESS has the limitation of its output during very short term period, this means that it is difficult to compensate the very short term output of wind farm. Using the EDLC (Electric Double Layer Capacitor), it is possible to solve the problem. Installing the battery system in the wind farm, it will be possible to decrease the total capacity of BESS consisting of HESS (Hybrid Energy Storage System). This paper shows simulation results when not only BESS is connected to wind farm but also to HESS. To verify the proposed system, results of computer simulation using PSCAD/EMTDC program with actual output data of wind farms of Jeju Island will be presented.

대체에러지 기술개발에 대한 수익성 평가분석 (An Economic Evaluation about Research and Development for Renewable energy in Korea)

  • 전영서;김진오
    • 기술혁신학회지
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    • 제7권2호
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    • pp.325-349
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    • 2004
  • This paper tried to evaluate an economic analysis about research and development far areas of renewable resource in Korea. To evaluate this validity, we tried to calculate the spillover effect of R&D investment through input-output table. In the first stage of spillover effect, we simply calculate the rate of return on R&D investment for renewable energy resources in Korea through the input-output model, which can calculate the value added as well as output based upon the price of 2000 year. According to the first stage calculation, the rate of return on R&B investment in solar heat is higher than any other renewable energy. In the second stage we tried to calculate the second round of spill over effect, which derives from the additional amount of supply of renewable resources due to the R&D investment. The overall evaluation of R&D invesment including the first stage as well as second stage spillover effect shows that bio-energy and waste energy generate 14 times as well as 2.5 times in the rate of return respectively.

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기기냉각수 폐열회수용 흡수식 히트펌프의 부분부하 성능에 관한 연구 (A Study on Partial Load Performance of Absorption Type Heat Pump for Waste Heat Recovery of Closed Cooling Water)

  • 박병철;김태형;김광수
    • 에너지공학
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    • 제28권2호
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    • pp.47-54
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    • 2019
  • 복합화력발전소 에너지절감 사업으로 폐열회수용 흡수식 히트펌프가 설치됨에 따라 부분부하(Partial Load)에서의 성능 데이터 확인을 위해 성능시험을 실시하였다. 부분 부하에서 히트펌프 가동에 따른 운전 데이터 변화는 다음과 같다. 기기냉각수(CCW) 배열 및 배열회수열교환기(HRSG)로부터 공급되는 저압증기(LP STM)의 일부가 히트펌프의 열원으로 공급되므로 지역난방열 생산이 증대된다. 그러나 증기터빈으로 공급되는 저압증기의 유량감소에 따라 증기터빈 출력이 감소된다. 또한 고압 지역난방열교환기(HP-DH) 및 저압 지역난방열교환기(LP-DH)로 공급되는 고압터빈(HPT) 배기증기의 유량 저하에 따라 HP-DH 및 LP-DH의 열생산량도 감소한다. 부분부하에서는 정격부하 대비 히트펌프에 운전에 따른 터빈 출력 저하가 큰 것으로 나타났으며, 이에 따라 부분 부하에서는 발전소 전체의 열 생산 증가량, 전기출력 감소량을 종합적으로 고려하여 히트펌프 운전 여부를 결정해야 한다.

Allocation of Energy Storage Capacity for Large Wind Farms in Korea using Discrete Fourier Transform

  • Moon, Seung-pil;Labios, Remund;Chang, Byung-hoon;Kim, Soo-yeol;Yoon, Yong-beum
    • KEPCO Journal on Electric Power and Energy
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    • 제2권3호
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    • pp.377-382
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    • 2016
  • In 2013, a total capacity of 591.3 MW of installed wind power generation was achieved in Korea, with a total of 1,139 MWh of wind energy generated that year. More wind power plants will be installed in the coming years, and it is important to develop methods to reduce the output variability of these resources so as to provide stable power to the power grid of Korea. In this regard, this paper proposes the use of energy storage system (ESS) as a means to stabilize the output variability of wind power plants. Presented in this paper is a method that uses Discrete Fourier Transform (DFT) to determine the ESS capacity needed to provide a stable power output for ancillary services such as frequency regulation, economic dispatch, and emergency reserves. In the first step of the proposed method, four regions (namely, Samdal, Yeongdeok, Yeongyang, and Gangwon) in Korea that had the most wind power generation capacity were selected for analysis. In the second step, the individual and aggregated wind power outputs of the selected regions in 2013 were obtained This information was then used in the third step, where DFT analysis of the power outputs was used to drive the magnitudes of the output variation. And finally, the ESS capacity requirements needed to provide different ancillary services were determined based on the magnitudes of the output variation.

하수처리장 방류수를 이용한 소수력발전 성능분석 (Performance Anaysis of Small Hydropower Plant Using Treated Effluent in Wastewater Treatment Plant)

  • 이철형;박완순
    • 한국태양에너지학회:학술대회논문집
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    • 한국태양에너지학회 2012년도 춘계학술발표대회 논문집
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    • pp.494-497
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    • 2012
  • A methodology to predict the output performance of small hydro power using treated effluent in wastewater treatment plant has been studied. Existing plant located Kyunggi-Do were selected and the output performance characteristics for these plants were analyzed. As a result, it was found that the developed model in this study can be used to analyze the output characteristics for small hydro power in wastewater treatment plant. Additionally, primary design specifications such as design flowrate, capacity, operational rate and annual electricity production were estimated and discussed.

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