in fig6 a uses a pv source such as the pv source 106 in fig1 with an open voltage of 996v at the time of the low voltage condition a short circuit current at 673 a and maximum power at 502 kw at 800v as in fig4 a 4c fig6 a c show the entire process of the operation of the inverter 104 in fig1 under these conditions the voltage regulation of the inverter 104 via the control of the crowbar module 108 is shown in the voltage trace 610 in fig6 b which is voltage from the pv source 106 from the crowbar module 108 to the dc input of the bridge 110 as shown in fig6 b the voltage output increases to 500 volts at 0 3 seconds when the pv source 106 is placed on line the voltage output is maintained at 500 volts between 0 3 seconds and 0 4 seconds the low voltage condition occurs at the grid 102 at 0 5 seconds and the voltage of the pv source 106 output to the bridge 110 begins to increase the voltage output of the pv source 106 to the bridge 110 gradually increases to 640v and stay at this value after 0 5 seconds due to the turn on of the crowbar module.