The student Oier Arregi Ezkurra obtained an OUTSTANDING qualification
The student Oier Arregi Ezkurra obtained an OUTSTANDING qualification
The student Oier Arregi Ezkurra obtained an OUTSTANDING qualification
Thesis title: "Gestión de energía en ascensores con sistemas de almacenamiento y energías renovables"
Court:
- Chairmanship: Víctor Herrera Pérez (Universidad San Francisco de Quito)
- Vocal: Andoni Saez de Ibarra Martínez de Contrasta (Ikerlan)
- Vocal: Jon Ander López Ibarra (Jema Energy)
- Vocal: Iván Sanz Gorrachategui (Universidad de Zaragoza)
- Secretary: Erik Garayalde Pérez (Mondragon Unibertsitatea)
Abstract:
In recent years, the main companies in the elevator sector have been working to minimize the consumption of their lifts and to make use of renewable energy sources in order to obtain more efficient and sustainable products and to contribute to the decarbonisation of the European electricity system. The use of renewable generation systems allows a reduction in energy consumption from the grid, thus reducing a community's electricity bill. However, the stochastic behaviour of renewable generation requires that the system also need to integrate an energy storage system (typically batteries) capable of powering the lift during low renewable generation. By integrating a battery, the contracted power to supply the lift can also be reduced, as the battery is responsible for supplying the power. The use of photovoltaic panels makes it possible to generate the energy needed to power the lift, while the batteries make it possible to store the energy generated. This generation may come from the panels when the lift is not consuming and does not require that energy or from the lift's regenerative trips, in which this surplus energy is traditionally burned and lost as heat.
A lift with batteries and photovoltaic panels needs an advanced energy manager to manage the power supply to the lift, charge the battery, and in some cases even feed energy back into the grid. The main goal of the management that these systems integrate is to optimize energy use by minimizing energy consumption from the grid, thus reducing the cost of the end users bill. In addition, to optimise the cost of the lift, it is also necessary to take into account the use of the battery to avoid its premature degradation. This management is a complex challenge due to the randomness of the lift consumption, the randomness of the photovoltaic generation and behaviour of the batteries depending on their state of charge and state of health, which makes it essential to have an energy management strategy able to adapt over time.
To address the challenge of optimising the management of these systems, different stages are addressed in this thesis. Firstly, the sizing of the battery and the photovoltaic panels will be optimised. This optimisation has to be carried out on the basis of the characteristics of the building, with which the traffic and the generation from renewable sources (photovoltaic) are estimated. Then, after sizing the system, the advanced energy management strategy will be designed, optimising the use of the energy storage system (battery) and the energy consumed from the grid. Finally, three case studies are presented to show the practical application of the developed control strategies together with the main conclusions of the thesis.