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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 Hok ... [...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 population density of . The total area is . Geography Nanae is at the southern end of the Oshima Peninsula, about away from Hakodate. The name of is derived from two former villages, and , a stratovolcano, is the highest mountain in the town, located on the town's boundary with Mori and Shikabe. Part of the , including the (大沼) and Konuma (小沼) ponds, is located within the town boundaries of Nanae. 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 Rail Nanae is served by the JR Hokkaido Hakodate Main Line, which links Hakodate with Sapporo and Asahikawa. Formerly, Sawara Branch Line also ran through the town. Ikedaen, Nagareyama ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aomori Prefecture
is a Prefectures of Japan, prefecture of Japan in the Tōhoku region. The prefecture's capital, largest city, and namesake is the city of Aomori (city), 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 List of Japanese prefectures by area, 8th-largest prefecture, with an area of , and the List of Japanese prefectures by population, 31st-most populous prefecture, with more than 1.18 million people. Approximately 45 percent of Aomori Prefecture's residents live in its two Core cities of Japan, 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 i ... [...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 possessing an electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations. Common phenomena are related to electricity, including lightning, static electricity, electric heating, electric discharges and many others. The presence of either a positive or negative electric charge produces an electric field. The motion of electric charges is an electric current and produces a magnetic field. In most applications, Coulomb's law determines the force acting on an electric charge. Electric potential is the work done to move an electric charge from one point to another within an electric field, typically measured in volts. Electricity plays a central role in many modern technologies, serving in electric power where electric current is used to energise equipment, and in electronics dealing with electrical c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HVDC Transmission Lines
A high-voltage direct current (HVDC) electric power transmission system 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. HVDC lines are commonly used for long-distance power transmission, since they require fewer conductors and incur less power loss than equivalent AC lines. HVDC also 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 50 and 60 Hz. This improves the stability and economy of each grid, by allowing the exchange of power between previously incompatible networks. The modern form o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Submarine Power Cables
A submarine power cable is a Power cable, transmission cable for carrying electric power below the surface of the water.Underwater Cable an Alternative to Electrical Towers Matthew L. Wald, ''New York Times'', 2010-03-16, accessed 2010-03-18. These are called "submarine" because they usually carry electric power beneath Seawater, salt water (arms of the ocean, seas, straits, etc.) but it is also possible to use submarine power cables beneath fresh water (large lakes and rivers). Examples of the latter exist that connect the mainland with large islands in the St. Lawrence River. Design technologies As key tools in bulk power transmission, submarine power tables tend to operate at high voltage in order to minimize resistive losses between the ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-voltage Direct Current
A high-voltage direct current (HVDC) electric power transmission system 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. HVDC lines are commonly used for long-distance power transmission, since they require fewer conductors and incur less power loss than equivalent AC lines. HVDC also 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 50 and 60 Hz. This improves the stability and economy of each grid, by allowing the exchange of power between previously incompatible networks. The modern form o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japan
Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea in the south. The Japanese archipelago consists of four major islands—Hokkaido, Honshu, Shikoku, and Kyushu—and List of islands of Japan, thousands of smaller islands, covering . Japan has a population of over 123 million as of 2025, making it the List of countries and dependencies by population, eleventh-most populous country. The capital of Japan and List of cities in Japan, its largest city is Tokyo; the Greater Tokyo Area is the List of largest cities, largest metropolitan area in the world, with more than 37 million inhabitants as of 2024. Japan is divided into 47 Prefectures of Japan, administrative prefectures and List of regions of Japan, eight traditional regions. About three-quarters of Geography of Japan, the countr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kamikita District, Aomori
is a 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 density of 78.5 persons per km2. The total area was 1281.05 km2. Politics In terms of national politics, the district is represented in the Diet of Japan's House of Representatives as a part of the Aomori 1st district and the Aomori 2nd district. Towns and villages The district consists of six towns and one village. The cities of Towada and Misawa were formerly part of the district. * Noheji * Oirase * Rokkasho * Rokunohe * Shichinohe * Tōhoku * Yokohama History Kamikita District was part of ancient , established by the Northern Fujiwara. During the Edo period, the area was part of the Morioka han feudal domain of the Nanbu clan, with daikansho located in Noheji and Shichinohe. The Nanbu clan sided with the Ōuetsu Reppan Dōmei during the Boshin Wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honshū
, historically known as , is the largest of the four main islands of Japan. It lies between the Pacific Ocean (east) and the Sea of Japan (west). 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 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 islands. Honshu also contains Japan's highest mountain, Mount Fuji, and its largest lake, Lake Biwa. Most of Japan's industry is located in a belt running along Honshu's southern coast, from Tokyo to N ... [...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 January 31, 2024, the city had an estimated population of 239,813 with 138,807 households, and a population density of . The total area is . The city is the third largest 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. The city was the biggest city in Hokkaido before the Great Fire of Hakodate in 1934. Pre–Meiji Restoration Hakodate (like other parts of around Hokkaido) was originally populated by the Ainu. 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 castle built by the Kono (Kano) clan in the fifteenth century. Hakodate was founded in 1454, wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
