Abstract Jiangdu No.3 Pumping Station is located at the source of East Route of SouthtoNorth Water Diversion Project.
The station is subject to amount of redundant water from the upper reach, so it can utilize the water to generate power; however, the time for pumping water is much longer than that for generating power. Considering those features, it is necessary to optimize the power generation scheme for this reversible pump unit. In doing so, the basic situation and benefits of power generated by the pump unit in reverse mode were introduced; the technical issues were analyzed and the economic benefits were compared when the pump unit is reverse mode. The benefits of the pumping station due to power generation in the past more than 3 years were summarized, and the net benefits of three power generation schemes were analyzed and compared from the relationship between investment and income. The results indicated that large pumping station generating power by exploiting redundant water from upper reach can achieve better economic and social benefits. However, if a pumping station can be used to generate power or not and what scheme will be adopted should depend on the consideration about the primary and secondary relationship between pumping water and power generation as well as the economic and social benefits. For Jiangdu No.3 Pumping Station, the initial power generation equipment was updated to frequency converters. Though the frequency converters were installed, the cost of the main electric motors was reduced, causing the total cost of equipments was decreased. As a result, the power output was increases by 30%-35%. Besides, the frequency converters have no influence on the pumping efficiency of pump units, so they are technologically feasible. Moreover, the frequency converters are reliable in operation and can be installed easily.
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