Green power inverter for solar cells

A downward tendency is now located in the price for these modules and for the same reason the cost of the inverters is becoming more visible in the total cost. The inverter is mainly needed for three reasons: - The low DC voltage generated by the PV-module (Typically 20 V to 40 V for a 72 cells PV-Module) must be amplified up to the higher AC voltage level in the grid. On the other hand, will is not be necessary to include the amplification if more PV-modules are connected in series. This is however not the case for the AC-module inverter, where one inverter is interfacing one PV-module. The power generated by the PV-module is very sensitive to its point of operation (current and voltage), and the inverter should therefore incorporate a function for tracking the Maximum Power Point (MPP). The main objective for the project has been to develop an inverter for AC-module applications. The inverter developed is made for: low-cost, reliability, and mass-production. The project has included a State-Of-The-Art (SOTA) analysis, detailed specifications, modeling and simulations of entirely new topologies. Two solutions are picked out on the basis of the previous mentioned specification and designed. One is selected for a final prototyping, which has been tested according to the specifications. The main achievements has been: 1) New AC-module configurations. 2) A new maximum power point algorithm. 3) A complete designed and tested AC-module. Both in laboratory and in the field. On most specifications it fulfills completely. It is now ready for more product development. 4) Analytical design expressions for the AC-module