Qingyuan Pumped Storage Power Station | |
---|---|
Country | China |
Location | Qingyuan, Qingxin District, Guangdong Province |
Coordinates | 23°44′11.07″N112°51′43.54″E / 23.7364083°N 112.8620944°E Coordinates: 23°44′11.07″N112°51′43.54″E / 23.7364083°N 112.8620944°E |
Status | Operational |
Construction began | 2008 |
Opening date | 2015 |
Operator(s) | China Southern Power Grid Company |
Upper reservoir | |
Creates | Qingyuan Upper |
Total capacity | 11,798,000 m3 (9,565 acre⋅ft) |
Lower reservoir | |
Creates | Qingyuan Lower |
Total capacity | 14,953,200 m3 (12,122.8 acre⋅ft) |
Power Station | |
Hydraulic head | 502.7 m (1,649 ft) |
Pump-generators | 4 x 320 MW Francis pump turbines |
Installed capacity | 1,280 MW |
The Qingyuan Pumped Storage Power Station is a 1,280 MW pumped-storage hydroelectric power station about 20 km (12 mi) northwest of Qingyuan in Qingxin District, Guangdong Province, China. Construction on the project began in October 2008. Six workers were killed while excavating a tunnel on 19 November 2012. [1] The upper reservoir began impounding water in March 2013 and the first generator and all four generators were commissioned by 30 November 2015. [2]
Qingyuan, formerly romanized as Tsingyun, is a prefecture-level city in northern Guangdong province, China, on the banks of the Bei or North River. During the 2010 census, its total population was 3,698,412, out of whom 1,510,044 lived in the urbanized Qingcheng and Qingxin districts. The primary spoken language is Cantonese. Covering 19,015 km2 (7,342 sq mi), Qingyuan is Guangdong's largest prefecture-level division by land area, and it borders Guangzhou and Foshan to the south, Shaoguan to the east and northeast, Zhaoqing to the south and southwest, and Hunan province and Guangxi Zhuang Autonomous Region to the north. The urban core is surrounded by mountainous areas but is directly connected with Guangzhou and the Pearl River Delta by Highway 107.
Qingxin District, formerly Qingxin County, is a district of Qingyuan City, in northwest-central Guangdong province, China.
The power station operates by shifting water between an upper and lower reservoir to generate electricity. The lower reservoir is located on Qin River and the upper reservoir is located in a valley above the west side of the lower reservoir. During periods of low energy demand, such as at night, water is pumped from Qingyuan Lower Reservoir up to the upper reservoir. When energy demand is high, the water is released back down to the lower reservoir but the pump turbines that pumped the water up now reverse mode and serve as generators to produce electricity. The process is repeated as necessary and the plant serves as a peaking power plant. It is operated by China Southern Power Grid Company. [3]
Peaking power plants, also known as peaker plants, and occasionally just "peakers", are power plants that generally run only when there is a high demand, known as peak demand, for electricity. Because they supply power only occasionally, the power supplied commands a much higher price per kilowatt hour than base load power. Peak load power plants are dispatched in combination with base load power plants, which supply a dependable and consistent amount of electricity, to meet the minimum demand.
The lower reservoir is created by a 75.9 m (249 ft) tall and 279 m (915 ft) long rock-fill dam on the Pan Wen River. It can withhold up to 14,953,200 m3 (12,122.8 acre⋅ft) of water, of which 10,580,800 m3 (8,578.0 acre⋅ft) can be pumped to the upper reservoir. The upper reservoir is created by a 54 m (177 ft) tall and 214 m (702 ft) long rock-fill dam. It can withhold up to 11,798,000 m3 (9,565 acre⋅ft) of water, of which 10,544,600 m3 (8,548.6 acre⋅ft) can be used for power production. Water from the upper reservoir is sent to the underground power station down near the lower reservoir through a 1,753 m (5,751 ft) long headrace/penstock pipe. The power station contains four 320 MW Francis pump turbines. The difference in elevation between the upper and lower reservoir affords a hydraulic head (water drop) of 502.7 m (1,649 ft). [4]
An underground power station is a type of hydroelectric power station constructed by excavating the major components from rock, rather than the more common surface-based construction methods.
A penstock is a sluice or gate or intake structure that controls water flow, or an enclosed pipe that delivers water to hydro turbines and sewerage systems. The term is inherited from the earlier technology of mill ponds and watermills.
Hydraulic head or piezometric head is a specific measurement of liquid pressure above a vertical datum.
The Guangdong Pumped Storage Power Station or Guangzhou Pumped Storage Power Station is a pumped-storage hydroelectric power station near Guangzhou, Guangdong Province, China. Power is generated by utilizing eight turbines, each with a 300 megawatts (400,000 hp) capacity, totalling the installed capacity to 2,400 megawatts (3,200,000 hp). The generated power is sold to China Light and Power customers in Hong Kong. The power station was constructed in two stages, the first four turbines were completed in 1994 and the second four in 2000.
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