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HVDC Hokkaido–Honshu
, for short, is a high voltage direct current transmission line for the interconnection of the power grids of Hokkaidō (Hakodate static inverter station in Nanae) and Honshū ( Kamikita static inverter station in Tohoku, Aomori Prefecture), Japan. The project went into service in 1979 by the Electric Power Development Company The , operating under the brand name J-POWER, formerly , is an electric utility in Japan. It mainly produces electricity from coal and hydroelectric power stations. It also has a few wind farms and is currently building a nuclear plant in Ohma, ... (J-POWER). A overhead line and a submarine cable connect the terminals. The HVDC Hokkaidō–Honshū is a monopolar HVDC line with an operating voltage of 250 kV and rated power of 300 megawatts. This HVDC system uses thyristor converters. In 2019 a second HVDC system between the two islands, with a rated power of 300 MW and using Voltage-Source Converters, was put into operation.New Hokk ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nanae, Hokkaido
is a town located in Oshima Subprefecture, Hokkaido, Japan. In April 2017, the town had an estimated population of 28,514, with 13,639 households, and a density of 130 persons per km2. The total area is 216.61 km2. Geography Nanae is at the southern end of the Oshima Peninsula, about 16 km away from Hakodate. The name of is derived from two former villages, and . *Highest mountain: 1133m, a stratovolcano History *1897: Nanae village and Iida village was merged to form Nanae village. *1902: Nanae village was merged with neighboring villages and became a Second Class Village. *1957: Nanae village became Nanae town. Transportation * Hakodate Main Line: Ōnakayama - Nanae - Oshima-Ōno( Hokuto) - Niyama - Ōnuma - Ōnuma-Kōen * Hakodate Main Line (Sawara Branch Line): Ōnuma - Ikedaen - Nagareyama Onsen - Chōshiguchi * Route 5 Education * High school ** Hokkaido Nanae High School Sister cities * Concord, Massachusetts (United States) * Miki, Kagawa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aomori Prefecture
is a prefecture of Japan in the Tōhoku region. The prefecture's capital, largest city, and namesake is the city of Aomori. Aomori is the northernmost prefecture on Japan's main island, Honshu, and is bordered by the Pacific Ocean to the east, Iwate Prefecture to the southeast, Akita Prefecture to the southwest, the Sea of Japan to the west, and Hokkaido across the Tsugaru Strait to the north. Aomori Prefecture is the 8th-largest prefecture, with an area of , and the 31st-most populous prefecture, with more than 1.2 million people. Approximately 45 percent of Aomori Prefecture's residents live in its two core cities, Aomori and Hachinohe, which lie on coastal plains. The majority of the prefecture is covered in forested mountain ranges, with population centers occupying valleys and plains. Aomori is the third-most populous prefecture in the Tōhoku region, after Miyagi Prefecture and Fukushima Prefecture. Mount Iwaki, an active stratovolcano, is the prefecture's highest p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Power Infrastructure In Japan
Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations. Various common phenomena are related to electricity, including lightning, static electricity, electric heating, electric discharges and many others. The presence of an electric charge, which can be either positive or negative, produces an electric field. The movement of electric charges is an electric current and produces a magnetic field. When a charge is placed in a location with a non-zero electric field, a force will act on it. The magnitude of this force is given by Coulomb's law. If the charge moves, the electric field would be doing work on the electric charge. Thus we can speak of electric potential at a certain point in space, which is equal to the work done by an external agent in carrying a unit of positiv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HVDC Transmission Lines
A high-voltage direct current (HVDC) electric power transmission system (also called a power superhighway or an electrical superhighway) uses direct current (DC) for electric power transmission, in contrast with the more common alternating current (AC) transmission systems. Most HVDC links use voltages between 100 kV and 800 kV. However, a 1,100 kV link in China was completed in 2019 over a distance of with a power capacity of 12 GW. With this dimension, intercontinental connections become possible which could help to deal with the fluctuations of wind power and photovoltaics. HVDC allows power transmission between AC transmission systems that are not synchronized. Since the power flow through an HVDC link can be controlled independently of the phase angle between source and load, it can stabilize a network against disturbances due to rapid changes in power. HVDC also allows the transfer of power between grid systems running at different frequencies, such as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Submarine Power Cables
A submarine power cable is a transmission cable for carrying electric power below the surface of the water.Underwater Cable an Alternative to Electrical Towers Matthew L. Wald, '''', 2010-03-16, accessed 2010-03-18. These are called "submarine" because they usually carry electric power beneath (arms of the , |
HVDC Converter Station
An HVDC converter station (or simply converter station) is a specialised type of substation which forms the terminal equipment for a high-voltage direct current (HVDC) transmission line.Arrillaga, Jos; High Voltage Direct Current Transmission, second edition, Institution of Electrical Engineers, , 1998. It converts direct current to alternating current or the reverse. In addition to the converter, the station usually contains: * three-phase alternating current switch gear * transformers * capacitors or synchronous condensers for reactive power * filters for harmonic suppression, and * direct current switch gear. Components Converter The converter is usually installed in a building called the valve hall. Early HVDC systems used mercury-arc valves, but since the mid-1970s, solid state devices such as thyristors have been used. Converters using thyristors or mercury-arc valves are known as ''line commutated converters''. In thyristor-based converters, many thyristors are conne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-voltage Direct Current
A high-voltage direct current (HVDC) electric power transmission system (also called a power superhighway or an electrical superhighway) uses direct current (DC) for electric power transmission, in contrast with the more common alternating current (AC) transmission systems. Most HVDC links use voltages between 100 kV and 800 kV. However, a 1,100 kV link in China was completed in 2019 over a distance of with a power capacity of 12 GW. With this dimension, intercontinental connections become possible which could help to deal with the fluctuations of wind power and photovoltaics. HVDC allows power transmission between AC transmission systems that are not synchronized. Since the power flow through an HVDC link can be controlled independently of the phase angle between source and load, it can stabilize a network against disturbances due to rapid changes in power. HVDC also allows the transfer of power between grid systems running at different frequencies, such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north toward the East China Sea, Philippine Sea, and Taiwan in the south. Japan is a part of the Ring of Fire, and spans Japanese archipelago, an archipelago of List of islands of Japan, 6852 islands covering ; the five main islands are Hokkaido, Honshu (the "mainland"), Shikoku, Kyushu, and Okinawa Island, Okinawa. Tokyo is the Capital of Japan, nation's capital and largest city, followed by Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, Kobe, and Kyoto. Japan is the List of countries and dependencies by population, eleventh most populous country in the world, as well as one of the List of countries and dependencies by population density, most densely populated and Urbanization by country, urbanized. About three-fourths of Geography of Japan, the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kamikita District, Aomori
is a Districts of Japan, district located in Aomori Prefecture, Japan. It occupies the east-central portion of the prefecture, south of Shimokita Peninsula. As of 2010, the district has an estimated population of 100,526 and a population density, density of 78.5 persons per km2. The total area was 1281.05 km2. In terms of national politics, the district is represented in the Diet of Japan's House of Representatives of Japan, House of Representatives as a part of the Aomori 1st district and the Aomori 2nd district. Towns and villages The district currently consists of six towns and one village. The cities of Towada, Aomori, Towada and Misawa, Aomori, Misawa were formerly part of the district. *Noheji, Aomori, Noheji *Oirase, Aomori, Oirase *Rokunohe, Aomori, Rokunohe *Shichinohe, Aomori, Shichinohe *Tōhoku, Aomori, Tōhoku *Yokohama, Aomori, Yokohama *Rokkasho, Aomori, Rokkasho History Kamikita District was part of ancient , established by the Northern Fujiwara. During the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honshū
, historically called , is the largest and most populous island of Japan. It is located south of Hokkaidō across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyūshū across the Kanmon Straits. The island separates the Sea of Japan, which lies to its north and west, from the North Pacific Ocean to the south and east. It is the seventh-largest island in the world, and the second-most populous after the Indonesian island of Java. Honshu had a population of 104 million , constituting 81.3% of the entire population of Japan, and is mostly concentrated in the coastal areas and plains. Approximately 30% of the total population resides in the Greater Tokyo Area on the Kantō Plain. As the historical center of Japanese cultural and political power, the island includes several past Japanese capitals, including Kyōto, Nara and Kamakura. Much of the island's southern shore forms part of the Taiheiyō Belt, a megalopolis that spans several of the Japanese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hakodate, Hokkaido
is a city and port located in Oshima Subprefecture, Hokkaido, Japan. It is the capital city of Oshima Subprefecture. As of July 31, 2011, the city has an estimated population of 279,851 with 143,221 households, and a population density of 412.83 persons per km2 (1,069.2 persons per sq. mi.). The total area is . The city is the third biggest in Hokkaido after Sapporo and Asahikawa. History Hakodate was Japan's first city whose port was opened to foreign trade in 1854, as a result of Convention of Kanagawa, and used to be the most important port in northern Japan. Also, the city had been the biggest city in Hokkaido before the Great Hakodate Fire of 1934. Pre-Meiji restoration Hakodate (like much of other parts of Hokkaido), was originally populated by the Ainu. They lived in the Oshima Peninsula. The name "Hakodate" may have originated from an Ainu word, "hak-casi" ("shallow fort"). Another possibility is that it means "box" or "building" in Japanese which refers to the castl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
