This paper presents the Short-term Load Forecasting Expert system (LoFES) which was developed and implemented for adopting artificial intelligence (Al) techniques in short-term load forecasting and supporting the huma...
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This paper presents the Short-term Load Forecasting Expert system (LoFES) which was developed and implemented for adopting artificial intelligence (Al) techniques in short-term load forecasting and supporting the human forecaster. This system had been developed from 1993 to 1995 in Korea Electric power Corp. (KEPCO), and it has been operated in a real environment since 1996. LoFES is intended to provide user-oriented features with a Graphical User Interface(GUI), and all the forecasting procedures of this system are carried out with a GUI. The forecasting methods of the system include an exponential smoothing method, a multiple regression method, and a neural network based method for ordinary day load forecasting;and fuzzy inference method for special day load forecasting. In the actual operation in 1996, this system provided good forecasting accuracy with the mean absolute percentage error below 1.6%, and it outperformed the conventional method used in KEPCO and effectively supported the human forecaster in forecasting process.
The total supervisory control and data acquisition (SCADA) system has been developed for the Okutataragi Pumped Storage power Station and its substation. The system applies an open distributed client-server computer a...
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There is a trend towards the introduction of high-voltage direct-current (HVDC) transmission technology that will facilitate such items as increased short-circuit capacity which accompanies the expansion of power syst...
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There is a trend towards the introduction of high-voltage direct-current (HVDC) transmission technology that will facilitate such items as increased short-circuit capacity which accompanies the expansion of powersystems and the longer distance of power transmission due to the remote locations of power supplies. The Kii Channel HVDC project has been planned by The Kansai Electric power Co., Inc., Shikoku Electric power Co., Inc., and Electric power Development Co., Ltd., and will start operation in July, 2000. This project transmits power generated by the Tachibana Bay Thermal power Plants between the Anan and Kihoku converter stations. On completion, the DC side voltage of the HVDC system will be increased to 500 kV, which will make it one of the largest HVDC transmission projects in the world. Hitachi has participated in all the HVDC transmission projects within Japan to date. This time, we developed the 500-kV DC apparatus and the control and protection equipment for the HVDC system in cooperation with the three electric power companies mentioned above. In this paper, we describe the newly developed high-voltage and large-capacity thyristor valve and the higher performance and reliability of the control equipment.
The power demand in Japan increases yearly especially in summer, and peaks in the daytime. The main cause is the drastically increased load of air conditioners used widely in general residences. The load pattern of ai...
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The power demand in Japan increases yearly especially in summer, and peaks in the daytime. The main cause is the drastically increased load of air conditioners used widely in general residences. The load pattern of air conditioners is very similar to the output pattern of a photovoltaic (PV) array. Therefore, Sanyo has been developing two types of residential solar-powered air conditioners. One is a unidirectional system by using a dc/dc converter which controls the voltage of a PV array at its optimal operation point and boosts the voltage up to the dc voltage of an inverter-type air conditioner. The other is a bi-directional system by using a bi-directional current-control converter, which regenerates surplus power into a commercial system from a PV array, and suppresses the input current distortion of an air conditioner. In this paper, the configurations and experimental results are described and discussed.
作者：
CALOGERO, RMCMANUS, DRobert Calogero graduated from the University of Maryland with a Bachelor of Science in Electrical Engineering in February 1965. He entered the Magnetic Defense Section of Propulsion
Power and Auxiliary Systems Division of the Naval Ship Engineering Center where he had previously served as a summer student engineering aid. In December 1968 he transferred to the Maintenance Management Branch of NAVSHIPS where he assumed responsibility as Manager of the Operational Sequencing System. Calogero is presently in the Engineering Administration Program offered at the George Washington University and is a member of the Association of Senior Engineers of the Naval Ships Systems Command. Donald McManus graduated from the Maine Maritime Academy in 1954
and received his Bachelor of Marine Science Degree Commission in the U. S. Naval Reserve and a USCG Marine Engineer's license. After graduation he sailed as a licensed engineer aboard steam and diesel powered tankers and “dry cargo” vessels engaged in worldwide commercial trade. Upon release from active duty in 1958 he was employed for the next eight and one-half years at the Sun Shipbuilding and Drydock Co. Chester Pa. in various engineering capacities. McManus came to the Naval Ship Engineering Center in December 1966 and is presently employed as a Marine Engineer in the Control Section of Machinery Arrangement and Controls Branch. He is a member of the Association of Senior Engineers of the Naval Ship Systems Command.
The many varied types of engineering plants extent in today's modern Navy requires an ever creasing range and depth of operational knowledge by engineering personnel at all levels of shipboard operations. The Engi...
The many varied types of engineering plants extent in today's modern Navy requires an ever creasing range and depth of operational knowledge by engineering personnel at all levels of shipboard operations. The Engineering operational Sequencing system (EOSS) provides each of these levels with the required information to enable the engineering plant to respond to any demands placed upon it which are within its design capability. The Engineering operational Sequencing system is a set of systematic and detailed written procedures utilizing charts, instructions and diagrams which provide the information required for the operation of a shipboard propulsion plant. The purpose of this paper will be to define and discuss the EOSS; to describe the system background, current status and future implementation plans.
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