Load Dispatching Operation of Power System and Meteorological Information

Shibata, Hajime

doi:10.1541/ieejpes.135.137

Cited by 2 publications

(3 citation statements)

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“…Electric power consumption.-Electric power consumption (EPC) is another measure of electrolyzer efficiency often used to describe the performance of alkaline, PEM, and solid oxide electrolyzers for H 2 production. 60 EPC characterizes the amount of electric energy (typically expressed in kWh) that is required for producing 1 Nm 3 of product gas, i.e. CO.…”

Section: Figures Of Meritmentioning

confidence: 99%

Review—Electrochemical CO₂ Reduction for CO Production: Comparison of Low- and High-Temperature Electrolysis Technologies

Küngas

2020

J. Electrochem. Soc.

289

240

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Recently, the field of CO2 electrolysis has experienced rapid scientific and technological progress. This review focuses specifically on the electrochemical conversion of CO2 into carbon monoxide (CO), an important “building block” for the chemicals industry. CO2 electrolysis technologies offer potentially carbon-neutral routes for the production of specialty and commodity chemicals. Many different technologies are actively being pursued. Electrochemical CO2 reduction from aqueous solutions stems from the success of alkaline and polymer electrolyte membrane electrolyzers for water electrolysis and uses performance metrics established within the field of aqueous electrochemistry. High-temperature CO2 electrolysis systems rely heavily on experience gained from developing molten carbonate and solid oxide fuel cells, where device performance is evaluated using very different parameters, commonly employed in solid-state electrochemistry. In this review, state-of-the-art low-temperature, molten carbonate, and solid oxide electrolyzers for the production of CO are reviewed, followed by a direct comparison of the three technologies using some of the most common figures of merit from each field. Based on the comparison, high-temperature electrolysis of CO2 in solid oxide electrolysis cells seems to be a particularly attractive method for electrochemical CO production, owing to its high efficiency and proven durability, even at commercially relevant current densities.

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Section: Figures Of Meritmentioning

confidence: 99%

Review—Electrochemical CO₂ Reduction for CO Production: Comparison of Low- and High-Temperature Electrolysis Technologies

Küngas

2020

J. Electrochem. Soc.

289

240

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Section: Prefacementioning

confidence: 99%

“…These renewable energy sources are clean and sustainable and do not emit greenhouse gases, but their output fluctuates in response to the weather conditions, posing challenges to the stability of the supply system. Photovoltaic (PV) generation is an example of the most widely deployed renewable source, so the transmission departments of power companies are investigating and deploying various measures to support demand/supply balancing in a system with a large PV component [2].In this study, we discuss the challenges that this poses and the approaches currently being pursued. However, the generation units that can be directly observed by telemetry from the central load dispatching center of a power company are limited to those interconnected with power lines of 60 kV or greater, which excludes most of the grid-connected PV.…”

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confidence: 99%

Technologies for estimation and forecasting of photovoltaic generation output supporting stable operation of electric power system

Yatsubo

Miyake

Takada

2018

IEEJ Transactions Elec Engng

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In recent years, Japan has rapidly extended its use of electricity obtained via photovoltaic (PV) generation. When the proportion of PV in the generation mix was small, its unpredictable output fluctuations had little effect on the supply and demand operation. However, as the role of PV in grid supply grows, predicting these fluctuations becomes increasingly necessary to ensure stable and economical operation of the electric power system. In this study, we discuss the current approaches of estimating and forecasting the PV output. PrefaceElectricity supply networks must balance the supply capacity with the fluctuating demand. Capacity is adjusted by bringing power stations on-and off-line and changing the power generated. However, the price of electricity from different units varies according to the generation method used and, therefore, it is necessary to seek the most economical combination at any demand level [1].Recent years have seen an expansion in the role played by renewable energy in Japan as the country attempts to build a low-carbon society. These renewable energy sources are clean and sustainable and do not emit greenhouse gases, but their output fluctuates in response to the weather conditions, posing challenges to the stability of the supply system. Photovoltaic (PV) generation is an example of the most widely deployed renewable source, so the transmission departments of power companies are investigating and deploying various measures to support demand/supply balancing in a system with a large PV component [2].In this study, we discuss the challenges that this poses and the approaches currently being pursued. However, the generation units that can be directly observed by telemetry from the central load dispatching center of a power company are limited to those interconnected with power lines of 60 kV or greater, which excludes most of the grid-connected PV. New techniques are therefore needed to monitor (estimate) the power generated by PV units. Necessity of Estimating and Forecasting PV outputIn the case of PV, abrupt fluctuations in output can be caused by short-term changes in weather conditions. These are too brief to be predicted from the daily weather forecast alone. Load balancing requires thermal power stations, hydroelectric generation, and pumped storage to be ramped up or run down to compensate for these abrupt fluctuations in the PV output.With the high penetration of PV, the grid operators may no longer be able to ensure constant power supply because thermal and hydroelectric generation constitutes a smaller proportion of the generation mix.In particular, mid-merit-order thermal stations, which play a key role in supply balancing, require several hours to bring the power units off or on line, making it necessary to evolve precise shortterm forecasting of PV output and ensure low power generation costs. PV Output Estimation TechnologyThe output of a PV unit can be calculated by multiplying the solar radiation intensity at the installation location by the conversion efficiency of the P...

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Load Dispatching Operation of Power System and Meteorological Information

Cited by 2 publications

References 0 publications

Review—Electrochemical CO₂ Reduction for CO Production: Comparison of Low- and High-Temperature Electrolysis Technologies

Review—Electrochemical CO₂ Reduction for CO Production: Comparison of Low- and High-Temperature Electrolysis Technologies

Technologies for estimation and forecasting of photovoltaic generation output supporting stable operation of electric power system

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Load Dispatching Operation of Power System and Meteorological Information

Cited by 2 publications

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Review—Electrochemical CO2 Reduction for CO Production: Comparison of Low- and High-Temperature Electrolysis Technologies

Review—Electrochemical CO2 Reduction for CO Production: Comparison of Low- and High-Temperature Electrolysis Technologies

Technologies for estimation and forecasting of photovoltaic generation output supporting stable operation of electric power system

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Product

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Review—Electrochemical CO₂ Reduction for CO Production: Comparison of Low- and High-Temperature Electrolysis Technologies

Review—Electrochemical CO₂ Reduction for CO Production: Comparison of Low- and High-Temperature Electrolysis Technologies