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Hydroelectric Power Generation Creating New Value Evolving Hydroelectric Power Generation HAYASHI Masataka Trends in Hydroelectric Power Generation and Toshiba's Approach TODA Kazunori / MORI Junji Hydroelectric power generation, which accounts for the largest share of renewable energy sources, is being reevaluated in terms of its role in maintaining stable power supplies by compensating for power fluctuations resulting from the increasing use of renewable energy sources such as wind and photovoltaic systems that are affected by weather conditions, in addition to its role as a baseload power supply. The ratio of hydroelectric power generation among all types of power generation facilities is expected to continue to increase globally in the future. As a leading company in the hydroelectric power generation field, Toshiba is responding to these circumstances by further advancing related technologies and promoting the expansion of their application worldwide. Commencement of Commercial Operation of Kazunogawa Hydroelectric Power Station Unit 4 of Tokyo Electric Power Co., Inc. Employing World's Largest Capacity Adjustable-Speed System FUJITA Takashi / TOJO Hirotaka / KOYAMA Hajime Unit 4 of the Kazunogawa Hydroelectric Power Station of Tokyo Electric Power Co., Inc., located in the cities of Otsuki in Yamanashi Prefecture, started commercial operation on June 9, 2014. Although construction work on Unit 4 was suspended in 2002, it was urgently restarted as a countermeasure against the shortage of electricity following the Great East Japan Earthquake. Toshiba successfully completed the manufacturing of the equipment and construction work within the short period of about three years. Unit 4 is an adjustable-speed pumped-storage hydroelectric power system with the world's largest capacity employing a pump turbine with the world's highest pump head and an AC excitation system using an injection enhanced gate transistor (IEGT) inverter and converter. It is expected to contribute to the stabilization of electricity generation and the effective utilization of hydropower resources, while providing a large-capacity storage function equivalent to that of constant-speed systems. Commencement of Commercial Operation of Kyogoku Hydroelectric Power Station Unit 1 of Hokkaido Electric Power Co., Inc. Equipped with Adjustable-Speed System TANAKA Takehiro / SAKAMOTO Shigeru / SHIOZAKI Yuichi Unit 1 of the Kyogoku Hydroelectric Power Station of Hokkaido Electric Power Co., Inc., located in the northeastern area at the base of Mt. Yoteizan about 35 km southwest of Sapporo City, entered commercial operation on October 1, 2014. This is the first solely pumped-storage type power plant (max. 600 MW, 200 MW × 3 units) applying an adjustable-speed system with peak-power supply capability and the ability to suppress fluctuations in frequency. Toshiba put the world's first adjustable-speed pumped-storage hydropower system into practical use in 1990 for the effective utilization of water resources. We have now applied injection enhanced gate transistors (IEGTs) to power conversion equipment in the AC excitation system of an adjustable-speed system for the first time, resulting in reductions in dimensions and loss. We have also developed the structure of a pump-turbine that allows the guide vanes to be disassembled from the lower side, for easy inspection. The Kyogoku Hydroelectric Power Station is expected to contribute to the stability of the electric power grid in Hokkaido. Approach to Large-Scale Refurbishment of Hydroelectric Power Plants in North America TAKEDA Masaru In recent years, there has been a conspicuous increase in demand for electricity accompanying the economic growth in developing countries. In countries having an abundance of potential hydroelectric power, including China, other Asian countries, and countries in South America, a large number of projects for the new construction of hydroelectric power plants are in progress. In economically developed North America, on the other hand, where hydroelectric power generation still plays an important role, the refurbishment and replacement of existing equipment are mainly being planned rather than new construction. Toshiba is vigorously promoting the large-scale refurbishment of existing hydroelectric power plants in North America, including hydroelectric power equipment manufactured by other companies, through activities based at the dedicated office of Toshiba International Corporation in Denver, Colorado. Technologies for Small and Medium-Sized Hydroelectric Power Generation Systems to Effectively Use Limited Water Resources TAMURA Yasushi / NAKAHARA Yusuke / MIYAZAKI Masahiro In the field of small and medium-sized hydroelectric power generation systems in Japan, demand has been growing for the renewal and new construction of equipment not only for the hydroelectric power plants of electric power companies to improve their performance and increase power output, but also for those of independent power producers to enhance their cost effectiveness accompanying the introduction of the feed-in tariff (FIT) system. In response to these market demands, Toshiba is actively engaged in the development and application of new technologies including an adjustable-speed control technology, as well as technologies to achieve the simplification of facilities and enhance the efficiency of plant operations such as electroactuation and air-cooled bearing technologies. Technologies to Achieve Higher Performance and Modernization of Hydroelectric Power Generation Facilities NAKAHARA Yusuke Hydroelectric power generation is expected to further expand worldwide as a power source that can provide large amounts of electricity with minimal increase in environmental burden. Against this background, Toshiba has been continuously developing a wide variety of technologies to improve the performance and quality of turbines and generators, including a simulation technology to optimize turbine runner shape, thrust bearings with a plastic surface, a radial ventilation cooling system, and many others. We are making efforts to supply products with the world's highest level of performance by applying these technologies to the new construction and renewal of hydroelectric power plants in both the Japanese and overseas markets. Ten Years of Progress at Toshiba Hydro Power (Hangzhou) Co., Ltd. and Approaches to Technical Development MORI Junji / ZHENG Jueping / SONG Xiang Toshiba Hydro Power (Hangzhou) Co., Ltd. (THPC), a base for the hydroelectric power generation business of Toshiba in the Chinese market, has celebrated its 10th anniversary of operation. Since its foundation in January 2005, THPC has been engaged in the development and expansion of its large-scale manufacturing factory and electric parts production factory, the establishment of research facilities including the Hydraulic Machine Research Laboratory and the Insulation Development Center, the introduction of a facility governance system equivalent to that in our Japanese facilities, and the nurturing of human resources, focusing on equipment for low-head and large-capacity hydroelectric power plants to meet the specific characteristics of the Chinese market. THPC has produced more than 100 units each of turbines and generators so far, and been making progress in further enhancing its technical capabilities. |