SMALL HYDROPOWER PLANTS AND EFFECTIVE HYDROPOWER UNITS FOR THESE PLANTS

• Datum: 2018
• Hauptverfasser: Permynov, Y., Monakhov, E.
• Format: Artikel
• Sprache: Ukrainisch
• Veröffentlicht: Institute of Renewable Energy National Academy of Sciences of Ukraine 2018
• Schlagworte: small hydropower plants; hydropower unit; synchronous generators; permanent magnets; output characteristics.
• Online Zugang: https://ve.org.ua/index.php/journal/article/view/182
• Назва журналу: Vidnovluvana energetika

The article deals with a review of the prospects of small hydropower plants in Ukraine. The requirements for its part in the whole energy production system in comparison with developed countries are shown. Some potential opportunities in the area of reconstruction of small hydropower plants and design of new plants are determined. At the present day, general energy forecast of small hydropower energy in Ukraine is estimated by 1240 MW. A constructive scheme of an effective hydro generator for small hydropower plant is proposed. Its main geometric relationships are provided. The previous experience of designing the low head small hydropower plants is used. The usage of a synchronous generator with high-density energy permanent magnet excitation (rare-earth permanent magnets NdFeB, SmCo) for hydropower units is proposed. It allows to simplify its design, increase reliability. The replacement electromagnetic excitation by permanent magnet excitation allows to exclude slipping rings, decrease power losses. The comparison of different synchronous permanent magnet generators for these electric stations is provided. Their constructive features are described. Also, some recommendations are given for its usage. A new design of synchronous generator with combined excitation is proposed. Its output characteristic is given, namely natural and stabilized external characteristic of a generator. The proposed generator with combined excitation allows substantially decrease total price due to the minimization expenses on electronic semiconductor converters.