| Autor: |
D M Bucur, C M Ghergu, N O Tănase, E C Isbăşoiu |
| Rok vydání: |
2010 |
| Předmět: |
|
| Zdroj: |
IOP Conference Series: Earth and Environmental Science. 12:012112 |
| ISSN: |
1755-1315 |
| DOI: |
10.1088/1755-1315/12/1/012112 |
| Popis: |
This paper analyzes the free surface level variation in the surge tank and in the secondary shafts of a complex hydro electrical scheme with two headraces and four secondary intakes. An analysis of the transient operating regimes of the hydropower plant must take in account the complex flow in the surge tank and in all the secondary catchments. Important operation restrictions and different transport capacities of the headraces must be considered. The study is completed with the mathematical model of the phenomenon and with the numerical simulation of the regimes. It is pointed out which are the operating regimes and the maneuvers that can cause malfunctions or undesirable incidents. Sometimes, because of the complexity of the hydroelectric schemes, appears the necessity of using multiple surge tanks. For a rational and sustainable use of the water resources new designs of the hydroelectric schemes with secondary catchments and shafts are studied (Chaudhry (3), Hincu (4), Wylie and Streeter (5)). The hydro power plant analyzed in this paper has two units supplied by two headraces coming from two different reservoirs, with a surge tank at their joining. The two headraces have several secondary water catchments (one water catchment at the left headrace and three at the right headrace). Each secondary water catchment has a shaft for surge tank purposes. This results in using different water volumes from the two reservoirs, and also in the power plant operation with different elevations in the reservoirs. The behavior of the surge tank is analyzed for different maneuver types used in the operation regimes of the hydropower plant. The regulation of the power plant consists strictly in variation of the water inflow. The power - frequency regulation of the power plant is made by the national electrical system. The water flow changes don't affect the rotational speed of the turbines, so it doesn't cause stability problems in power plant operation. The maximum available water flow is 55 m 3 /s for both units and 36 m 3 /s for one unit. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
