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Reservkraft och reservdrift i Messaure kraftstation
Umeå University, Faculty of Science and Technology, Umeå Institute of Technology. Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2015 (Swedish)Independent thesis Basic level (university diploma), 180 HE creditsStudent thesis
Abstract [en]

A major part of the hydropower plants in Sweden has been in operation for a long time. There have been large changes in how the operation of hydropower plants is managed. There used to be operating personnel on site at each power plant. Today's operating personnel patrol several power plants, and the control and operation is done from a control center. Nowadays the hydropower has gained a greater role as a balancing force. This leads to higher demands for hydropower plants. In order to achieve good safety and ensure that current guidelines are followed, many of the power plants need maintenance and/or reconstruction.

The amount of water going through the turbine in a hydropower plant is adjusted to the annual average water flow. The instantaneous flow of water varies a lot during the year, and the water flow is at its lowest when the energy is most needed. Therefore, dams are used to store water and energy can be generated during the parts of the year when it is most needed. The dam should always be able to compensate for peak flows, even at loss of local power. To make this possible, backup power and emergency operation is needed. The guidelines for dam safety contain basic principles on how backup power and emergency operation should be designed depending on the type of dam and safety class. Every power plant is unique and needs to adapt these functions according to what is appropriate for the individual power plant.

The owners of the dam are obliged to do regular self-controls. One way to do this is to perform a “comprehensive dam safety evaluation” (FDU). A dam that has shown weaknesses and deviations in the latest FDU report is the dam at Messaure. In 2013, a number of deviations from current guidelines of backup power and emergency operation were identified. This report investigates possible ways to meet current guidelines for these functions.

The report investigates the different types of loads in Messaure power station, the size of the loads and whether they need to be connected to the backup power. At startup, different types of loads are affecting the diesel generator in the backup power in different ways. Currents have been measured and analyzed. With this in consideration, a number of suggestions on how to solve backup power and emergency operation challenges at the Messaure power station are presented.

The different suggestions have different strengths, especially when taking economic aspects into account. The suggestion recommended in this report is the one that is the most redundant and follows current research and guidelines: a backup power system with UPS and battery packs for all three spillway gates. The UPS:s run asynchronous motors, standard products held in storages. In case of local force failure, the existing diesel generator is used for heating, lighting and maintenance charging of the battery packs to the UPS's. To create redundancy in the system the cables should be feeding the UPS:s separately, as far as possible.

For emergency operation, a diesel generator that manages a direct start without excessive voltage drop is selected. To avoid failure in the spill way function, the engine's torque and power must not drop too much. The emergency operation diesel generator is installed on a trailer and - in case of emergency – is transported and connected to the spill way.


Place, publisher, year, edition, pages
2015. , 47 p.
, EL, 1534
Keyword [sv]
Reservkraft reservdrift avbördning utskov ridas
National Category
Engineering and Technology
URN: urn:nbn:se:umu:diva-113673OAI: diva2:888155
External cooperation
WSP Systems i Umeå
Educational program
Högskoleingenjörsprogrammet i Elkraftteknik - nätbaserat
2015-06-03, Umeå Universitet - Tfe 901 87 Umeå, Umeå, 13:22 (Swedish)
Available from: 2015-12-28 Created: 2015-12-22 Last updated: 2015-12-28Bibliographically approved

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