Patent ID: 8384364

Claim:
A unit inverter system connected with a power system, comprising: a plurality of unit inverters, each of the unit inverters including a semiconductor switching element, each unit inverter converting a direct current power source voltage into an alternating current voltage in accordance with a gate signal of the semiconductor switching element thereof, and outputting an alternating current; a controller configured to determine target unit inverters among the plurality of unit inverters to selectively start and stop the target unit inverters in accordance with an amount of power to be converted; and a plurality of regulators, each of the regulators being connected to each of the unit inverters as an own unit inverter thereof, each regulator being configured to, when the controller determines to stop the own unit inverter, determine dead time of the own unit inverter according to an output current value of the own unit inverter and an average output current value of the unit inverters, wait for the determined dead time so as to reduce the output current of the own unit inverter, and then turn off the gate signal to stop the own unit inverter.