Читать книгу Energy - Группа авторов - Страница 52

The flexibility in electricity generation from the wind and solar renewable source poses some challenges on power generation from hydro. To fulfil the demand of variable energy production along with limited capability for energy storage, hydraulic turbines need to operate at a wide range and changing conditions (Valero et al. 2017). Recently, some developments have taken place in control technology to reduce the flow instabilities which occur due to self‐induced instability in the operation of hydro turbines. Several techniques have emerged which decrease the flow instabilities in hydro turbine operation. These comes under passive and active control techniques (Kougias et al. 2019). Number of techniques are reported under these two types of control technologies. Some other techniques have also been reported by a recent research known as ‘Magneto‐rheological control techniques’ (Trivedi et al. 2015) which uses magneto‐rheological brake to mitigate flow instability along with the decreasing speed of the runner.