Mål og konklusjon

Oppgave:

  • Study and analyze different types of PV panels and systems for residential power generation.
  • Develop cost-effective solutions for HEMS with BMS
  • Model and simulate the system components
  • Validate the proposed solutions.

 

Mål:

  • To study and analyze different cost-effective energy-efficient and flexible solutions for home energy management systems (HEMS)
  • To develop and implement in MATLAB-Simulink different models of the system components
  • To make a case study for data collection and to develop different scenarios based on.
  • Compare different solar cell technologies in terms of efficiency and financial cost.
  • Combine component models and to simulate a complete HEMS.
  • Produce an emissions study to validate the environmental impact of PV installations.

Konklusjon:

Monocrystalline PV-modules is cost-effective with an asset return of 7% in 20 years, while thin-film PV-modules were not cost-effective in our simulation.

 

Both thin-film and monocrystalline PV cells have approximately 20% effectiveness and have the biggest loss in our PV-system (80% of the irradiation from the sun is lost). Scientists have developed PV cells with 47.1% effectiveness which is promising for cost-effective solutions.

 

In our simulation shading on the modules is the biggest loss which can be reduced by making more strings with an MPPT and boost converter for each string, instead of an inverter with two MPP inputs. This is proven with the comparison between the PVSOL and MATLAB simulation.

 

Stand-alone systems were proven to be impossible with the chosen components, consumption, and roof surface in our simulation.

 

The battery can be replaced by an electric vehicle, because of the high loss and low PV-power generation during the wintertime. Batteries could still prove cost-effective for load-shaving of peaks during the winter by injecting power from the grid during off-peak hours.

 

The model of the PV array, MPPT, and inverter in MATLAB were validated by comparison with PVSol and we concluded that it is possible to make a more efficient PV system by using an MPPT controlling a boost converter instead of the inverter.

 

From the emission study based on Norwegian conditions, we conclude that the monocrystalline panel from Jinko Solar is the best solution in terms of CO2 emissions throughout its warranty time. The thin-film PV panels from First Solar did not provide an environmentally viable solution due to transportation emissions.

 

We have proposed a solution for a HEMS that includes a BMS and LMS. This system is implemented but not fully functional in our MATLAB model. The simulation of individual components works as intended but the complete model does not behave as expected. This is due to the BMS does not produce realistic results. This means that any HEMS control over the BMS is non-functional.