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Variable-frequency Transformer
A variable-frequency transformer (VFT) is used to transmit electricity between two (asynchronous or synchronous) alternating current frequency domains. The VFT is a relatively recent development. Most asynchronous grid inter-ties use high-voltage direct current converters, while synchronous grid inter-ties are connected by lines and "ordinary" transformers, but without the ability to control power flow between the systems. It can be thought of as a very high power synchro, or a rotary converter acting as a frequency changer, which is more efficient than a motor–generator of the same rating. Construction and operation A variable-frequency transformer is a doubly fed electric machine resembling a vertical shaft hydroelectric generator with a three-phase wound rotor, connected by slip rings to one external power circuit. The stator is connected to the other. With no applied torque, the shaft rotates due to the difference in frequency between the networks connected to the rotor and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Power
Electric power is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Standard prefixes apply to watts as with other SI units: thousands, millions and billions of watts are called kilowatts, megawatts and gigawatts respectively. A common misconception is that electric power is bought and sold, but actually electrical energy is bought and sold. For example, electricity is sold to consumers in kilowatt-hours (kilowatts multiplied by hours), because energy is power multiplied by time. Electric power is usually produced by electric generators, but can also be supplied by sources such as electric batteries. It is usually supplied to businesses and homes (as domestic mains electricity) by the electric power industry through an electrical grid. Electric power can be delivered over long distances by transmission lines and used for applications such as motion, light or heat with high efficien ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quadrature Booster
A phase angle regulating transformer, phase angle regulator (PAR, American usage), phase-shifting transformer, phase shifter (West coast American usage), or quadrature booster (quad booster, British usage), is a specialised form of transformer used to control the flow of real power on three-phase electric transmission networks. For an alternating current transmission line, power flow through the line is proportional to the sine of the difference in the phase angle of the voltage between the transmitting end and the receiving end of the line. Where parallel circuits with different capacities exist between two points in a transmission grid (for example, an overhead line and an underground cable), direct manipulation of the phase angle allows control of the division of power flow between the paths, preventing overload. Quadrature boosters thus provide a means of relieving overloads on heavily laden circuits and re-routing power via more favorable paths. Alternately, where an interc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comisión Federal De Electricidad
The Comisión Federal de Electricidad ( en, Federal Electricity Commission) is the state-owned electric utility of Mexico, widely known as CFE. It is the country's dominant electric company, and the country's second most powerful state-owned company after Pemex. The Mexican constitution states that the government is responsible for the control and development of the national electric industry, and CFE carries out this mission. The company's slogan is "Una empresa de clase mundial" ("A World-Class Company"). Affiliations CFE is not a part of the North American Electric Reliability Corporation, though its transmission system in northern Baja California is part of the Western Electricity Coordinating Council through its interconnection with San Diego Gas & Electric via the Miguel-Tijuana and the LaRosita-Imperial Valley Lines and the Path 45 corridor; it also has a few other interconnections across the border with local utilities in the United States. On August 2, 2019, the federa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ERCOT
The Electric Reliability Council of Texas, Inc. (ERCOT) is an American organization that operates Texas's electrical grid, the Texas Interconnection, which supplies power to more than 25 million Texas customers and represents 90 percent of the state's electric load. ERCOT is the first independent system operator (ISO) in the United States. ERCOT works with the Texas Reliability Entity (TRE), one of eight regional entities within the North American Electric Reliability Corporation (NERC) that coordinate to improve reliability of the bulk power grid. As the ISO for the region, ERCOT dispatches power on an electric grid that connects more than 46,500 miles of transmission lines and more than 610 generation units. The United States Energy Information Administration Electric Power Monthly published the following detailed report regarding Texas's Net Generation by Energy Source: Total (All Sectors), 2010-December 2020, (Thousand Megawatthours), Table 1.1, for the Month of December 202 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., federal district, five major unincorporated territories, nine United States Minor Outlying Islands, Minor Outlying Islands, and 326 Indian reservations. The United States is also in Compact of Free Association, free association with three Oceania, Pacific Island Sovereign state, sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Palau, Republic of Palau. It is the world's List of countries and dependencies by area, third-largest country by both land and total area. It shares land borders Canada–United States border, with Canada to its north and Mexico–United States border, with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laredo, Texas
Laredo ( ; ) is a city in and the county seat of Webb County, Texas, United States, on the north bank of the Rio Grande in South Texas, across from Nuevo Laredo, Tamaulipas, Mexico. Laredo has the distinction of flying seven flags (the Flag of the Republic of the Rio Grande, flag of the former Republic of the Rio Grande, which is now the flag of the city, in addition to the Six flags over Texas, Six Flags of Texas). Founded in 1755, Laredo grew from a village to the capital of the short-lived Republic of the Rio Grande to the largest inland port on the Mexico–United States border, Mexican border. Laredo's economy is primarily based on international trade with the United States largest trading partner Mexico, and as a major hub for three areas of transportation: land, rail, and air cargo. The city is on the southern end of Interstate 35, I-35, which connects manufacturers in northern Mexico through Interstate 35 as a major route for trade throughout the U.S. It has International ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beauharnois, Quebec
Beauharnois () is a city located in the Beauharnois-Salaberry Regional County Municipality of southwestern Quebec, Canada, and is part of the Greater Montreal Area. The city's population as of the Canada 2011 Census was 12,011. It is home to the Beauharnois Hydroelectric Power Station, as well as the Beauharnois Lock of the Saint Lawrence Seaway. History The Battle of Beauharnois was fought at Beauharnois in 1838, between Lower Canada loyalists and Patriote rebels. As part of the 2000–2006 municipal reorganization in Quebec, the neighbouring towns of Maple Grove and Melocheville were amalgamated into Beauharnois on January 1, 2002. Geography Communities The following locations reside within the municipality's boundaries: *Domaine-de-la-Pointe-des-Érables () – a residential area north of Maple Grove * Maple Grove () – a former municipality that makes up the northeast boundary of Beauharnois *Melocheville () – a former municipality that makes up the we ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Les Cèdres, Quebec
Les Cèdres is a municipality located north of the Saint Lawrence River in the Montérégie of Quebec, Canada, near Vaudreuil-Dorion. The population as of the Canada 2021 Census was 7,184. The name means "The Cedars" in French. There is an extensive rapid on the St. Lawrence River at this location. During the American Revolution, the Battle of the Cedars was fought in the vicinity. In 1959-1960 Swedish writer, Stig Claesson, lived in the village at a place called Point Charlie and later wrote a book about it called ''My friend Charlie''. History This location was already notable in the late 17th century because of the large rapids on the St. Lawrence River, marked by tall cedars (French: ''les cèdres'') that grew there in abundance. Hence, the location was originally known as Cedars Rapids, or as mentioned by cartographer Deshayes in 1695, as ''Rapide du des Cèdres''. Subsequently, it was also known as Coteau-des-Cèdres, Portage-du-Coteau-des-Cèdres, or just Les Cèdr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydro-Québec
Hydro-Québec is a public utility that manages the generation, transmission and distribution of electricity in the Canadian province of Quebec, as well as the export of power to portions of the Northeast United States. It was established by the Government of Quebec in 1944 from the expropriation of private firms. This was followed by massive investment in hydro-electric projects like the James Bay Project. Today, with 63 hydroelectric power stations, the combined output capacity is 37,370 megawatts. Extra power is exported from the province and Hydro-Québec supplies 10 per cent of New England's power requirements. Hydro-Québec is a Crown corporation (state-owned enterprise) based in Montreal. In 2018, it paid CAD$2.39 billion in dividends to its sole shareholder, the Government of Québec. Its residential power rates are among the lowest in North America. More than 40 percent of Canada’s water resources are in Québec and Hydro-Québec is the fourth largest hydropower pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northeastern United States
The Northeastern United States, also referred to as the Northeast, the East Coast, or the American Northeast, is a geographic region of the United States. It is located on the Atlantic coast of North America, with Canada to its north, the Southern United States to its south, and the Midwestern United States to its west. The Northeast is one of the four regions defined by the U.S. Census Bureau for the collection and analysis of statistics. The region is usually defined as including nine U.S. states: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, and Vermont. The U.S. Census Bureau–defined region of the Northeastern United States has a total area of with of that being land mass, making it the smallest region of the United States by both land mass and total area. The Northeastern region is the nation's most economically developed, densely populated, and culturally diverse region. Of the nation's four census regions, the N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canada
Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by total area. Its southern and western border with the United States, stretching , is the world's longest binational land border. Canada's capital is Ottawa, and its three largest metropolitan areas are Toronto, Montreal, and Vancouver. Indigenous peoples have continuously inhabited what is now Canada for thousands of years. Beginning in the 16th century, British and French expeditions explored and later settled along the Atlantic coast. As a consequence of various armed conflicts, France ceded nearly all of its colonies in North America in 1763. In 1867, with the union of three British North American colonies through Confederation, Canada was formed as a federal dominion of four provinces. This began an accretion of provinces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Québec
Quebec ( ; )According to the Canadian government, ''Québec'' (with the acute accent) is the official name in Canadian French and ''Quebec'' (without the accent) is the province's official name in Canadian English is one of the thirteen provinces and territories of Canada. It is the largest province by area and the second-largest by population. Much of the population lives in urban areas along the St. Lawrence River, between the most populous city, Montreal, and the provincial capital, Quebec City. Quebec is the home of the Québécois nation. Located in Central Canada, the province shares land borders with Ontario to the west, Newfoundland and Labrador to the northeast, New Brunswick to the southeast, and a coastal border with Nunavut; in the south it borders Maine, New Hampshire, Vermont, and New York in the United States. Between 1534 and 1763, Quebec was called ''Canada'' and was the most developed colony in New France. Following the Seven Years' War, Quebec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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