Small hydro schemes
نویسنده
چکیده
POWER ENGINEERING JOURNAL APRIL 2002 61 I nduction generators are commonly used for small hydro schemes due to advantages such as availability, low cost and robustness. The cost per kW of a single-phase generator is generally higher than a threephase generator. Hence a three-phase generator, which produces a single-phase output, is normally used. In order to minimise further the capital cost, crude voltage and frequency control techniques are used. The voltage and frequency are maintained within acceptable values by connecting a resistive ballast, which maintains the sum of the consumer load and the ballast load at a constant value. A detailed description of the systems used for small hydro plants can be found in References 1, 2 and 3.
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