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Photovoltaic Charging Station (PV-CS) with Battery Energy Storage System (BESS)

  

Optimised Self-Consumption and system Self-Sufficiency

Aim of the PV-CS BESS Project

 

Battery Electric Vehicles (BEVs) are an attractive option for substituting conventional diesel and petrol fuelled vehicles, delivering zero emissions. The opportunity to cut CO2 emission is further maximised when leveraging the technology with renewable solar energy sources at the generation point.

Dublin Institute of Technology (DIT) has realised the viability of this dual design solution, with its recent deployment of PV-CS in its expanding campus of Grangegorman located in inner Dublin city. The charging station is utilised to accommodate the charge of two 13.76 kWh Light weight Electric Vehicles (LEVs).

Since the main idea behind DIT’s PV-CS prototype is to harvest green electricity and maximise grid independency and subsequently self-consumption, a PV array of 10.5 kWp has been deployed on the flat roof building of North Annex House (NAH) Grangegorman campus.  Accommodating the LEVs charge via AC coupled configured PV-CS has potential to reduce the energy demand on the grid, as the electricity is locally generated in a green manner by means of solar panels.

Due to intermitted level of sunshine and variable nature of load demand, smart charging is achieved via integration of 9.6 kWh lithium type Battery Energy Storage System (BESS) as part of the designed system. Moreover, BESS can increase self-consumption ratio, where the excess energy from the PV generation is accumulated. This buffered energy can be used when solar radiation is not available to supply the load demand.

Thus, the system is customised with the supervisory control, which can allow monitoring the energy measurement signals, decide on the optimal flow of PV-CS input/output signals and further amplify the share of solar generated power. The overall supervisory energy monitoring, control and communication is accomplished via sophisticated sensors and controllers, including  Sunny Island (Battery Energy Management), Sunny Remote Control, SMA Radio Control Socket, Energy Meter, Energy Home Manager and Sunny Portal. The hub of intelligence and energy management control of the PV-CS is incorporated in Energy Home Manager device. Sunny Home Manager receives all the measurements data from the aforementioned devices for PV generation, grid feed-in, purchased electricity, load profile, battery charge and discharge. It further prioritises and optimises the overall energy flow and self-consumption while considering system’s technical and economic constraints.

 

Papers

More information can be found here.

Video

4th. August, 2017 : RTE News.                                                                                                      

Contributors

The PV-CS BESS project team is made up of Dublin Institute of Technology (DIT)’s Prof. Brian Norton, Prof. Michael Conlon and researcher Ayda Esfandyari. Supporting the work is Prof. Sarah McCormack of Trinity College, Dublin (TCD).

Queries, please email : pvcs_bess@dit.ie