transformer is configured to receive the ac power from the power converter and to deliver ac power at a second voltage to a utility power network the voltage adjustment device is configured to adjust the first voltage to a target value determined on the basis of a voltage of the dc power application_number US 62509309 A description referring to fig1 in a grid connected solar photovoltaic pv system 150 a photovoltaic array 100 includes a collection of pv panels 102 connected in a series parallel arrangement each pv panel is composed of multiple interconnected pv cells u201c solar cells u201d 104 pv panels connected in series known collectively as a u201c string u201d 106 enable a high operating voltage to be achieved multiple strings 106 are connected in parallel to achieve a target generated power rating of the pv array 100 pv array 100 is connected to a dc bus 108 of an inverter 110 which converts dc power generated by pv array 100 to ac power the voltage of the ac power is increased by a step up transformer 112 for delivery to a medium voltage e g 34 5 kv collector bus 114 in some embodiments pv array 100 generates a medium voltage and inverter 110 is a medium voltage inverter that delivers converted medium voltage ac power directly to collector bus 114 referring to fig2 the terminal voltage versus current characteristic for a typical solar cell is shown for a fixed solar irradiance i e the amount of sunlight shining on the.