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REMOTE CENTRALISED COMPUTER CONTROL OF THREE LOW HEAD TURBINES IN SERIES NEAR SLIGO

Ziel

To install and remotely control a cascade system of three low head turbines over a telephone link from a central computer and to provide solutions to problems associated with asynchronous generators - for example self-excitation, power factor correction, and reconnection transients.
The hydraulic design of the overall project has proved to be a success. The projections for maximum power output was 2.0 megawatts. This has been exceeded by 5%; the maximum power output at low tide and maximum flow is 2.09 megawatts. This would indicate that the hydraulic design of
(i) the intake works
(ii) the channels
(iii) the forebay areas
(iv) the setting of the turbines
(vi) the outlet channels from draft tubes
(v) the draft tubes
are giving optimum results.
The overall hydraulic design also allows successful computer control of the turbine cascade. The design of each of the turbine by-pass channels and weirs etc. allow the various control operations to be carried out in a simple and effective way.
For example, it is extremely important that flow rejection from each of the turbines is catered for. Flow rejection occurs mainly in two circumstances:
(i) Following loss of grid
(ii) Turbine trip due to fault
In each of these instances, the flow through the turbines is reduced in eight seconds by the operation of a weight falling to close the guide vanes. In the case of maximum flow for example, 12 m3/s must be diverted from the turbine to the by-pass spillway in eight seconds. There is a also a resulting surge wave, which is approximately 0.5m high, travelling at a celerity of 3.0 m/s. This surge wave must also be catered for.
Technical outlook for the project is good. The turbines are performing well with respect to their efficiency at full load and part load.
The only remaining major problem is the lack of automatic trash cleaning. A design for automatic screens has been completed.
The control system is operating satisfactorily and successfully demonstrates the way in which a cascade can be controlled automatically.
Three sites are in cascade on the River Ballisodare, which will be developed as listed below.
SITE 1 2 3 (tidal)
Nett head (m) 5. 6 5. 4 5. 4-8. 2
Flow (m3/sec) 12 12 12
Turbine output (kW) 620 554 1016
Turbine type Double reg. bevel gear bulb at each site
Generator type Induction Induction Induction
Generator output (kW) 590 525 965
Voltage (V) 660 660 660
The opportunity to operate the stations unmanned (at significant cost savings) arises from the adoption of a fully automated system, both controlled and supervised remotely. The stations at Ballisodare are to be operated from Carlow, using equipment interfaced to each end of a dedicated telephone link.
The use of microprocessor based data acquisition and processing systems allows the continuous monitoring and control of the three separate units whose hydraulic and electrical characteristics differ.

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Koordinator

BALLISODARE ELECTRIC CO LTD
EU-Beitrag
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Adresse
SHREWSBURY LAWN 100 CABINTEELY
18 Dublin
Irland

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