Inverter for solar cell array

A full-bridge neutral point clamped (NPC) inverter having an input and an output for converting a direct current voltage at said inverter input to an alternating current voltage at said inverter output acceptable for connection to a utility, said NPC full-bridge inverter comprising:

• eight switching elements S1 to S8, said switching elements S1 to S4 forming a first half of said NPC inverter full-bridge and said switching elements S5 to S8 forming a second half of said NPC inverter full-bridge inverter;
• and
• a pulse width modulator control unit having a predetermined carrier frequency, said control unit using for each carrier period either positive or negative values of a reference voltage to generate a predetermined number of signals to control the switching on and off of each of said eight switching elements in a predetermined pattern for a predetermined period of said carrier frequency period to thereby produce said alternating current voltage at said inverter output acceptable for connection to said utility and not produce between said inverter input and earth ground a carrier frequency component.