http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Oh Byoungryul,Lee Da-Han,Jeong Woo-Cheol,Lee Duehee 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.2
In this paper, the distributed method for alternating current optimal power fl ow (AC OPF) based on second order cone programming (SOCP) and consensus alternating direction method of multipliers (ADMM) is proposed. Due to recent trend toward distributed energy resources in distribution systems, the AC OPF problem has become a diffi cult challenge to distribution market operators. The diffi culties of the AC OPF problem are non-convex and long computational time. To secure the convexity, the SOCP is introduced when formulating the problem. The performance of the SOCP is verifi ed by comparing with the direct current optimal power fl ow, which is a widely known method to secure convexity, in terms of the dispatch and cost of generation. To shorten the computational time, the consensus ADMM is introduced when solving the problem. The OPF problem is decomposed into sub-problems, which account for the power fl ow of a single bus. Then, the sub-problems are solved using the consensus ADMM, which consists of parallel computing and communication. Finally, the performance of the SOCP and consensus ADMM is verifi ed by a three-bus radial test system. By using the SOCP, the AC OPF becomes a convex problem while maintaining its modeling rigorousness. By using the consensus ADMM, the OPF problem is solved in distributed manner while having the same result of the centralized method. Furthermore, the eff ect of the ADMM parameter on the convergence speed is verifi ed.
Oh Byoungryul,Lee Duehee 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3
We propose a cooperative peer-to-peer (P2P) energy transaction framework in the distribution network based on the distributed optimization against path-sharing distribution network congestion. The direct transactions between buyers and sellers in the neighboring distribution network might cause the path-sharing distribution network congestion, which represent overlapping congestions because of multiple and simultaneous transaction paths. Moreover, the direct transaction can compromise anonymity. In this study, we propose the cooperative operation between the distribution system operator (DSO) and P2P market operator (PMO) to mitigate these congestions. In our framework, the PMO matches transactions between buyers and sellers, and the DSO detects the congestion and congestion-induced generators by comparing dispatches based on the AC OPF and P2P transactions. Then, the PMO re-matches transactions after curbing the maximum capacity of the congestion-induced generators to avoid path-sharing congestions. In this process, we solve the matching problem by using a consensus alternating method of multipliers (CADMM), in which a buyer, seller, and the PMO equally participates to secure anonymity. Finally, we verify that our framework minimizes the total transaction cost and number of congestion occurrences, and that it prevents over-current and over-voltage in a 15-bus distribution system while protecting private information. Furthermore, we determine the optimal acceleration parameters in the CADMM via heuristic experiments.
Kim Sookyung,Oh Byoungryul,Lee Duehee 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3
We suggest a real-time (RT) capacity payment given as a price incentive to peak generators that provide capacity to power systems to achieve favorable return on investment (ROI) for generator investment costs. In the South Korean (Korean) electricity market with the application of merit order, it is hard for peak generators to retrieve investment costs and thus a missing money problem occurs. As the proportion of renewable energy increases, it will become harder for generators to achieve favorable ROI. Furthermore, more generators are necessary to provide regulation services to mitigate the fluctuation of renewable energy while enduring high fixed costs and low energy prices. Therefore, we suggest that the price of operating reserves based on the operating reserve demand curve (ORDC) should be used as a RT price incentive. We design an ORDC for the Korean market based on the methodology of Electricity Reliability Council of Texas (ERCOT), using the 2021 Korean electricity demand and supply data. We also verify the validity of this Korean ORDC by calculating the changes in generator profit.
Publisher Correction: A Comprehensive Review on Ensemble Solar Power Forecasting Algorithms
Rahimi Negar,Park Sejun,Choi Wonseok,Oh Byoungryul,Kim Sookyung,Cho Young-ho,Ahn Sunghyun,Chong Chulho,Kim Daewon,Jin Cheong,Lee Duehee 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3
In this article the grant number in the funding note section has been given as R19XO02-03.
A Comprehensive Review on Ensemble Solar Power Forecasting Algorithms
Rahimi Negar,Park Sejun,Choi Wonseok,Oh Byoungryul,Kim Sookyung,Cho Young-ho,Ahn Sunghyun,Chong Chulho,Kim Daewon,Jin Cheong,Lee Duehee 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2
With increasing demand for energy, the penetration of alternative sources such as renewable energy in power grids has increased. Solar energy is one of the most common and well-known sources of energy in existing networks. But because of its non-stationary and non-linear characteristics, it needs to predict solar irradiance to provide more reliable Photovoltaic (PV) plants and manage the power of supply and demand. Although there are various methods to predict the solar irradiance. This paper gives the overview of recent studies with focus on solar irradiance forecasting with ensemble methods which are divided into two main categories: competitive and cooperative ensemble forecasting. In addition, parameter diversity and data diversity are considered as competitive ensemble forecasting and also preprocessing and post-processing are as cooperative ensemble forecasting. All these ensemble forecasting methods are investigated in this study. In the end, the conclusion has been drawn and the recommendations for future studies have been discussed.