Method of operating a power supply system having parallel-connected inverters, and power converting system

A system for converting DC power to AC power, comprising:

• (a) a plurality of inverters, each inverter being adapted to receive DC power and convert the DC power to AC power;
• and
• (b) a controller connected to the inverters and controlling operation of said inverters on the basis of DC power available, the controller causing more inverters to run if sufficient DC power is available and fewer inverters to run if there is insufficient DC power, wherein said controller operates any one of said inverters such that the amount of AC power outputted from said any one of said inverters increases or decreases in correspondence with an increase or decrease in the amount of electric power outputted from the DC power supply, and said controller operates remaining ones of said inverters at a predetermined standard value.

A system for converting generated electric power to AC power, wherein a plurality of inverters provided respectively with a protector for effecting system interconnection protection for a commercial power supply are connected in parallel, and electric power generated by a generator is converted to electric power corresponding to a commercial power supply and is outputted from a number of inverters which number is determined on the basis of the amount of generated electric power, comprising:

• a controller for effecting protected operation of said plurality of inverters by a protector provided in at least one of said inverters when at least two of said inverters are running.