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Jiangsu Liyang PSPS, situated in Liyang City in south Jiangsu Province, has an installed capacity of 1500MW. It is developed mainly for peaking, valley filling, and emergency standby of Jiangsu Power Grid and concurrently for frequency modulation and phase modulation of the grid. Its powerhouse accommodates six sets of 250MW reversible pump-turbine motor-generator units. The power station has a rated head of 259.00m, a design annual output of 2,007 GWh, and an annual power consumption for pumping 2,676 GWh. The replenishing water source for the initial filling and operation period of the power station is the existing Shahe Reservoir.
Main Technical Features:
1) Complicated Geological Conditions in Project Area
The bedrock of the upper reservoir area is mainly of Maoshan Formation of Upper Silurian system, and rock type is of highly weathered medium-extremely thick quartz sandstone intercalated with argillaceous siltstone. The rock attitude varies greatly and the geological structure is complicated. The phreatic water in the fissures around the upper reservoir is about 60~140m deep, so the seepage control of the reservoir is critical. The bedrock of the lower reservoir area is mainly of Longwangshan Formation of Upper Jurassic system, and rock type is of rhyolitic welded tuff, crystal tuff, and tuff breccia. Faults and alteration zones are encountered in most of the boreholes in the lower reservoir area. The headrace power system crosses formations of Silurian system and Jurassic system, and the surrounding rocks of headrace tunnel and underground powerhouse are of quartz sandstone, argillaceous siltstone and litharenite of Silurian system, with greatly varied attitude of rocks and developed structures. The tailrace tunnel crosses the contact zone of two formations, characterized by broken rock mass and poor tunneling conditions.
2) High Environmental Protection Requirements for Project Development
The project area is located in Grade AAAA national tourism and resort zone, so the requirements of environmental protection and landscape treatment need to be considered in the project design and construction planning.
3) Great Impact of Large Volume of Excavation and Filling on Project Cost
The main dam for the upper reservoir is of concrete-faced rockfill type with a total volume over 15 million m3, and the earth-rock excavation for the upper and lower reservoirs is about 30 million m3. Therefore, full utilization of the materials from excavation for dam building and earth-rock cut-fill balancing are important for cost saving of the project.
4) High Requirement on Unit Stable Operation due to Great Head Variation Range
The head variation range is 37.00m for the upper reservoir and 19.00m for the lower reservoir, and the ratio of maximum pumping lift to minimum generation head is up to 1.296.