Cascade hydropower stations in Shui Yuan developed by cascade in Yuanshui River Basin.

Guazhi Hydropower Station is located in the middle and lower reaches of Qingshui River in the upper reaches of Yuanshui River in Jinping County, Guizhou Province. The upstream is about 18.0 km from Sanbanxi Hydropower Station, and the downstream is about 7.0 km from Jinping County, which is the third level of cascade planning in Shui Yuan. The project mainly focuses on power generation and has comprehensive utilization benefits such as improving shipping conditions. The control basin area above the dam site is 1 1372 square kilometers, with a total storage capacity of 5.493 billion cubic meters, which has daily regulation performance. The installed capacity of this power station is 3×50 MW. This project is a low-head riverbed power station, which belongs to the third category of medium-sized projects. Main buildings (dam, riverbed workshop, etc.). ) is designed as a three-level building, and the second-level building is designed as a four-level building. The design flood standard of retaining and discharging buildings and workshops adopts 50-year return flood, and the check flood standard adopts 500-year return flood. According to the 50-year flood design, the corresponding flood level and storage capacity are 322.92 meters and 0.410.84 billion cubic meters respectively; According to the 500-year flood check, the corresponding flood level and storage capacity (total storage capacity) are 32,557 meters and 54.93 million cubic meters respectively; The normal water level of the reservoir is 322.00 meters, corresponding to the storage capacity of 0.410.84 billion cubic meters; The dead water level is 320.00 meters, corresponding to the storage capacity of 34.74 million cubic meters.

Power station hub buildings are mainly composed of barrage, flood discharge and energy dissipation facilities, riverbed powerhouse and switching station. The dam is a concrete gravity dam with * * * minutes 14 dam sections, with a total crest length of 3 13. 1m, a crest elevation of 327.00m, and a maximum dam height (overflow dam) of 44.0m m. The total length of the four non-overflow dam sections on the left bank is 76.0 m, and the maximum dam height is 35.0. The maximum dam height is 32.0m. Each dam section is a typical triangular section, with a crest width of 10.0m, a vertical upstream face, and a slope ratio of 1:0.7 below the elevation of the downstream face of 314.00m.. The overflow dam is arranged in the main channel on the left bank of the river bed, with a total of * * 6 dam sections (including the right pier and Unit 3, which are combined into one dam section through construction joints), with a total length of 124.0m, a 5-kongming overflow weir with a width of 18.0m, and the overflow surface spans the transverse joints. WES type practical weir is adopted for overflow weir, with the crest elevation of 305.50m, controlled by arc steel gate, and the form of underflow energy dissipation is adopted. The riverbed workshop is arranged on the floodplain on the right side of the riverbed and is divided into three units with a total length of 74.1m. The elevation of the bottom plate of the water inlet of the power station is 292.00 meters, and the workshop installation room is arranged behind the gravity dam on the right side of the main engine room. The power station adopts the downstream horizontal access mode, and the access road is connected with the external rerouting road of Sanbanxi on the right bank.

The project officially started on February 6, 2005, and the sluice was closed on June 5, 2007. In March 2007, the project passed the water storage safety appraisal and the project completion safety appraisal in May 2008. Tuokou Hydropower Station is located in the upper reaches of Yuanshui River, about 3.5 kilometers downstream of Tuokou Town, Hongjiang District, Huaihua City, Hunan Province. The project center is distributed. The main dam, spillway gate and power station of small-scale ecological hydropower station are arranged near Dongyou Temple in the downstream of Tuokou Town, and the power station, navigation structure and auxiliary dam of large-scale hydropower station are arranged at Wangjiaaokou. The factory is about 20km away from the former town highway, 30km away from hongjiang city highway and 70km away from Huaihua highway. The tail water in the reservoir area of Hongjiang Hydropower Station has arrived near the plant area.

Tuokou Hydropower Station is a first-class (1) project with power generation as its main development task and comprehensive utilization benefits such as shipping. The shipping design is that 50-ton ships pass through the dam, the designed freight volume is 200,000 tons/year, and the waterway grade is VII. The normal storage level of Tuokou Hydropower Station is 250.00 meters, corresponding to the storage capacity of 65.438+0.249 billion cubic meters, the regulated storage capacity of 66.5438+0.50 billion cubic meters, and the storage capacity coefficient is 0.037, which has the performance of incomplete annual regulation. The power station is equipped with four Francis hydrogenerators with a single unit capacity of 200 MW and two Francis hydrogenerators with a single unit capacity of 15mw, with a total installed capacity of 830 MW and a guaranteed output of128.9mw. The average power consumption for many years is 2 1.3 1 100 million kWh, and the annual utilization hours are 2,630 MW. Designed according to the principle of "unattended" (few people are on duty), all contract equipment shall meet the requirements of "unattended" (unattended).

Large power stations are connected to the power system with a voltage level of 500 kV, and the combination of generators and transformers is connected by combined units. The high voltage side of 500 kV is 2-in and 2-out (including 1 reserved outgoing line) and adopts single bus configuration.

The small ecological discharge power station is connected to the power system with the voltage level of 1 10 kV, and two ecological discharge generators and 1 transformer are connected to the 1 expansion unit. The total installed capacity of Anjiang Hydropower Station is 140 MW, 1 10kV 1 return line. The ship lock is arranged on the left side of the power station, which is a single-stage five-channel ship lock with a design tonnage of100t. The normal water level of the reservoir is165m, and the storage capacity is 654.38+208 million cubic meters. According to the local hydrological data, the annual guaranteed output time of the power station is 40 14 hours, and the annual average power generation is 562 million kwh. The on-grid electricity price is 0.3 15 yuan/kwh. Anjiang Hydropower Station is under construction and construction is expected to start in September this year. The total construction period is 36 months, the construction preparation period is 2 months, the main project construction period is 25 months, the project completion period is 9 months, and the power generation period of the first unit is 27 months.

At present, Anjiang Hydropower Station has basically completed the administrative examination and approval work; Completed the construction of access roads and the relocation of special facilities in the construction area of access roads and dam sites; Complete the line design and erection of construction power supply, and complete the physical quantity survey of 4 towns 189 households in the dam area; Land compensation is paid to the dam area120,000 yuan. According to the requirements of the municipal government and the owner, the construction of site leveling, river bifurcation cofferdam, construction camp, sand and gravel, mixing system and other projects in the dam area of Anjiang Hydropower Station began in early April of 20 10, and the cofferdam was intercepted in September of 20 10, and the main project started. Qingshuitang Hydropower Station is located in Chenxi County, Huaihua City, which is in the middle of Yuanshui River. It is the sixth-grade hydropower station developed by cascade in Yuanshui, Hunan Province. The dam site is located 0.5km upstream of Qingshuitang Village, Xianrenwan Township, Chenxi County. There is a highway in Xianrenwan Township at the lower reaches of the left bank, which is connected with the provincial highway 1802, leading to Huaihua City and Chenxi County respectively, with a distance of 69 kilometers and 55 kilometers respectively. It is a hydropower hub project that focuses on power generation and gives consideration to comprehensive utilization such as shipping.

The hub building mainly includes four parts: dam, power station, ship lock and revetment engineering. Normal water level of reservoir139m, installed capacity of power station 128 MW. The dam is a riverbed overflow dam with a crest elevation of154.5m and a maximum dam height of 37.50m. The overflow dam is located in the middle of the riverbed with a crest elevation of124.0m. * * has a 20×15m radial gate and 13 hole. Located on the left bank of the river bed, the power station is a low-head river bed power station with 4×32 MW bulb tubular turbine generator set. Located on the right bank of the river bed, the ship lock is a four-class ship lock with a design tonnage of 500 tons. The construction of Wuqiangxi Power Plant in Hunan Province began on May 1993+0 1 and was established on May 1994+0.

With a total installed capacity of 6.5438+200,000 kW (5×240 MW), it is the backbone power plant for cascade hydropower development in Yuanshui River Basin and the backbone peak-shaving and frequency-modulation power plant in Central China Power Grid.

Wuqiangxi Power Plant is located in the main stream of Yuanshui County, which controls 93% of the area of Yuanshui River Basin. The survey was started on 1952, started and stopped twice on 1956 and 1980, and resumed in April on 1986 and 1994. With a total investment of 8.9 billion yuan, advanced technology and equipment were introduced from the United States, Japan, Germany and other countries 1 1, which was a key project of the seventh and eighth five-year plans. Power plants mainly generate electricity, which has comprehensive benefits such as flood control and shipping. The guaranteed output of the unit is 255 MW, and the designed average power generation for many years is 5.37 billion kWh. Two 500 kV voltage levels are used for output lines, one for Loudi Minfeng Substation and the other for Changde Shi Gang Substation, forming the first 500 kV main ring network in Hunan Power Grid. The dam is a concrete gravity dam with a maximum dam height of 85.83m, a normal water level of108m and a total storage capacity of 4.29 billion cubic meters. This is a seasonally regulated reservoir. With the cooperation of Fengtan Reservoir in the upper reaches, the flood control standard of the tailgate levee can be raised from once every five years to once every 20 years. Navigation structure is a single-line continuous third-class ship lock, with an designed annual freight volume of 2.5 million tons and an annual timber volume of 460,000 cubic meters. Lingjintan Hydropower Station, located in Taoyuan County, Hunan Province, is the lowest cascade in the main stream of Yuanshui River. The dam site is 47.5 kilometers away from Wuqiangxi Hydropower Station and 40 kilometers away from Taoyuan County. The basin area above the dam site of Lingjintan Hydropower Station is 85,800 square kilometers, accounting for 95.3% of the total area of 90,000 square kilometers in Yuanshui River Basin. The average annual flow is 2090 cubic meters per second, and the average annual runoff of the reservoir is 65.9 billion cubic meters.

Lingjintan Hydropower Station is a comprehensive utilization hydropower station which mainly generates electricity and has shipping benefits. As a reverse regulation power station of Wuqiangxi Hydropower Station. The normal water level is 5 1.0m, the flood limit water level is 50.0m, the total storage capacity is 634 million cubic meters, and the effective storage capacity is 46 million cubic meters. The total installed capacity of the power station is 270,000 kilowatts, the guaranteed output is 56,600 kilowatts, and the average power generation for many years is 654.38+0.265438+0.5 billion kWh. After the power station is completed, it will supply power to Changde area 1 10 kV line twice, and supply power to Hunan main network 220 kV line 1 time. In the flood season, it mainly bears the basic load. In the dry season, it not only undertakes 40,000 kW shipping base load, but also undertakes peak shaving in synchronization with Wuqiangxi Hydropower Station, and undertakes system accident reserve. After the completion of Lingjintan Hydropower Station, the channel from Wuqiangxi to Lingjintan was channelized for nearly 50 kilometers, and Wengzidong, the last great shoal downstream of Yuanshui River, was submerged below the dead water level, which enabled the 2×500-ton barge fleet to navigate and fundamentally improved the shipping conditions downstream of Yuanshui River.

When the normal high water level of Lingjintan Hydropower Station is 5 1.0m, the water surface area of the reservoir is 25.25 square kilometers, and the submerged length along the main stream is 41.4km. The reservoir inundation involves six townships 1 13 villagers' groups in Taoyuan and Yuanling counties. According to the investigation result of 1995, * * * flooded 6358.5 mu of cultivated land, including 5424 mu of paddy field and 934.5 mu of dry land. Lingjintan Reservoir is located in the middle and lower reaches of Yuan River, with subtropical climate, warm and humid, annual rainfall of 1000 ~ 1730mm, and heavy rain causes floods. The reservoir area has dense vegetation and good soil and water conservation. The annual average sediment discharge at the dam site is 6.5438+0.43 million tons, and the annual average sediment concentration is 0.206 kg/m3. After the completion of the upstream Wuqiangxi Hydropower Station, it will be more conducive to reducing the solid runoff of Jin Ling Beach.