IREM supplies the main components that make a plant connected to the national grid. In this type of plant the hydroelectric turbine is made with a view to produce energy to be sold to the electric grid. The performances of the hydroelectric turbines and its components are essential to guarantee the attended return of the investment.
Turbine-Generator Group: Pelton Turbines TPA, Banki Turbines TBA
Control board: QPR, QPR-S
Both the components are available in several configurations.
STARTING OF THE PRODUCTION PLANT IN PARALLEL TO THE ELECTRICAL GRID WITH ASYNCHRONOUS GENERATORS
The starting in parallel to the grid of active users, with an asynchronous generator directly connected to the distribution network, is an often critical phase in the operation of the system.
As is known, asynchronous generators, due to their intrinsic characteristic, at the instant of starting absorb a current peak (inrush current) higher than the rated value, consequently, it is necessary to adopt particular starting methods of asynchronous generators to avoid disservices and malfunctions.
The starting and parallel procedures with the distribution network of asynchronous generators can substantially take place in two ways (as required by the CEI 0-21 standard in Italy):
- With a prime mover: when the rotation is generated by another “engine” member, such as the hydroelectric turbine which, by pushing the water, sets the generator in rotation.
- By grid: means starting the generator substantially operating as a motor which, if suitably connected to the grid, begins to rotate.
In the first case, the generator of the hydroelectric turbines is started by gradually opening the water, and the parallel device is closed at nominal speed: the starting current remains in fact that one characterizing the asynchronous generator (7/10 times the rated current “In” ), but with a very short time since the generator is already rotating.
In the second case, an electronic conversion device (Inverter) is used, which starts the generator using the national electricity grid, limiting the starting current peak. In relation to the characteristics of the power line, starting will be more or less immediate, while the current peak will always be limited.
IREM PROPOSAL
CONTROL BOARDS QPR, QPR-S
FOR GRID CONNECTED PLANTS
The IREM QPR-QPR-S control boards are designed and built to start the hydroelectric turbines both in the “with prime mover” mode and in the “grid” mode, the methodology can be chosen during the improvement of the installation.
However, the high experience of Irem gained thanks to the high number of hydroelectric turbines installed, on the national and European territory and managed by the QPR-QPR-S automation and parallel panels, allows to define the start of the generator safer and more reliable ” by grid ” with starting current limiter.
- connexion électrique de l’installation hydroélectrique avec le réseau national répondant aux conditions des normes de référence
- gestion des actionneurs électriques pour le réglage du débit d’eau
- surveillance de tous les paramètres de l’installation.
Les solutions les plus complètes sont fournies par nombreux options, par exemple le contrôle à distance par ordinateur, tablet ou smartphone. Capteurs comme par exemple les sondes de température, vibration, niveau d’eau dans la cuve de charge et pression en conduite.
Ces types de solutions sont parfaites pour installation mini-hydro de puissance moyen-haute ou il est fondamental contrôler constamment les données hydrauliques et électriques.
