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Marmiroli Marta,Yokoyama Ryuichi The Korean Institute of Electrical Engineers 2006 Journal of Electrical Engineering & Technology Vol.1 No.1
In an electricity market, the spot market is normally integrated with a forward or future market. The advantage of the forward market is to allow the market participants to deal in a part or the whole trading portfolio at a fix price in advance and to avoid risk associated to the uncertain price of the spot market. Japan has introduced a continuous auction base forward market from April 2005. This paper analyzes the Japanese forward market rules and operations, and introduces a new algorithm that may improve the efficiency of the market itself. The proposed algorithm enables us to give consideration to the specific characteristics of the power system and to integrate them in the auction mechanism. The benefits of the proposed algorithm are verified on an electronic simulation platform and the results described in this paper.
Wheeling Charge Reflecting the Transmission Conditions based on the Embedded Cost Method
Hamada, Hiromu,Yokoyama, Ryuichi The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.1
This paper proposes a practical and devised method for designing the wheeling charge based on the embedded cost method. In setting up the wheeling charge, one of the most important items is recovering the invested cost. Because the marginal cost method has the disadvantages regarding the above point, the embedded cost method is focused in this paper. By applying the proposed method, the wheeling charge that reflects the use of transmission systems not only gives an incentive for the efficient operation of power systems but also achieve the recovery of the invested cost by electric utilities. In order to verify the proposed method, several simulations have been conducted on the IEEE 30-bus test system.
Marta Marmiroli,Ryuichi Yokoyama 대한전기학회 2006 Journal of Electrical Engineering & Technology Vol.1 No.1
In an electricity market, the spot market is normally integrated with a forward or future market. The advantage of the forward market is to allow the market participants to deal in a part or the whole trading portfolio at a fix price in advance and to avoid risk associated to the uncertain price of the spot market. Japan has introduced a continuous auction base forward market from April 2005. This paper analyzes the Japanese forward market rules and operations, and introduces a new algorithm that may improve the efficiency of the market itself. The proposed algorithm enables us to give consideration to the specific characteristics of the power system and to integrate them in the auction mechanism. The benefits of the proposed algorithm are verified on an electronic simulation platform and the results described in this paper.
An EID-based Fault Diagnosis Method for the Distribution Feeder with PV Generation Embedded
Hu, Bo,Yokoyama, Ryuichi,She, Jinhua,Zhou, Yicheng The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.3
This paper describes a new fault diagnosis method based on an equivalent-input-disturbance (EID) approach for distribution feeder with photovoltaics (PV) generation embedded. In this method, the faults are regarded as disturbances of system, which can be estimated by EID approach. Through analyzing the characteristics of the EID, the faults position can be located and the fault types can be identified. Firstly, a dynamic model of distribution feeder for fault diagnosis is built. Next, an EID estimator is designed. Finally, the simulation results demonstrate the effectiveness of the method.
Profit-based Thermal Unit Maintenance Scheduling under Price Volatility by Reactive Tabu Search
Sugimoto Junjiro,Yokoyama Ryuichi The Korean Institute of Electrical Engineers 2005 KIEE International Transactions on Power Engineeri Vol.a5 No.4
In this paper, an improved maintenance scheduling approach suitable for the competitive environment is proposed by taking account of profits and costs of generation companies and the formulated combinatorial optimization problem is solved by using Reactive Tabu search (RTS). In competitive power markets, electricity prices are determined by the balance between demand and supply through electric power exchanges or by bilateral contracts. Therefore, in decision makings, it is essential for system operation planners and market participants to take the volatility of electricity price into consideration. In the proposed maintenance scheduling approach, firstly, electricity prices over the targeted period are forecasted based on Artificial Neural Network (ANN) and also a newly proposed aggregated bidding curve. Secondary, the maintenance scheduling is formulated as a combinatorial optimization problem with a novel objective function by which the most profitable maintenance schedule would be attained. As an objective function, Opportunity Loss by Maintenance (OLM) is adopted to maximize the profit of generation companies (GENCOS). Thirdly, the combinatorial optimization maintenance scheduling problem is solved by using Reactive Tabu Search in the light of the objective functions and forecasted electricity prices. Finally, the proposed maintenance scheduling is applied to a practical test power system to verify the advantages and practicability of the proposed method.
Best-Mix Generation Planning with Battery Energy Storage System Including Carbon-Neutral Requirement
Shimizukawa, Jun,Iba, Kenji,Hida, Yusuke,Yokoyama, Ryuichi,Tanaka, Kouji,Seki, Tomomichi The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.1
Battery energy storage system (BESS) is attracting attention all over the world. BESS yields two types of benefits, i.e., economical benefit and environmental benefit. Economical benefit is yielded by reducing the cost of power plants that is composed by the operation cost and the construction cost. Recent serious concern against environment will be more important in the near future and it might be treated as penalty and/or constraints. The installation merit of BESS stands out when load factor of demand is low. If base generators composed of inexpensive and clean sources, and if peak generators composed of expensive and dirty sources, the benefit against operation cost becomes more remarkable. Besides, BESS can contribute to developing countries by reducing construction cost of generation plants. In this paper, the numerical analysis of this benefit is presented. The optimal amount of BESS is searched by evaluating CO2-reductions and cost benefits.
Nozawa, Tatsuhiro,Miyaguchi, Yuki,Hida, Yusuke,Koyanagi, Kaoru,Yokoyama, Ryuichi,Shirai, Goro 대한전기학회 2012 The Journal of International Council on Electrical Vol.2 No.1
This paper presents the effectiveness evaluation approach of demand side management (dema nd control) for frequency regulation in regional power networks (so called Cluster-oriented networks). The analytical model of the frequency fluctuation for a three-cluster interconnected network model was developed with MATLAB/SIMULINK. The control method is similar to the conventional TBC (Tie Line Bias Control) widely used in power grids. In order to maintain the quality of frequency, Battery Energy Storage Systems (BESS) and controllable loads such as heat pumps installed in the customer side will play an effective role in clusters. By the results of conducted simulations, it shows that the proposed new frequency regulation scheme by utilizing controllable loads such as battery charges and heat pumps retains effectiveness to suppress frequency deviation when a large amount of natural renewable energy is installed in the regional cluster-oriented networks.