Patent ID: 8369117

Claim:
A power conversion system (PCS) that converts an output of a DC power supply received from an external power supply, the power conversion system comprising: a converter that converts a voltage of the input power supply; an inverter that converts an output voltage of the converter into an AC voltage; a converter control module that outputs a PWM signal for controlling a switch of the converter; an inverter control module that outputs a PWM signal for controlling a switch of the inverter; a first sensor module that measures a voltage value and a current value; and a second sensor module that measures a output voltage value of the converter and a third sensor module that measures a output current value of the inverter, wherein after receiving a power instruction value, the converter control module generates the PWM signal for controlling the converter based on the power instruction value and wherein after receiving a voltage instruction value, the inverter control module controls an error value between the voltage instruction value and the voltage value measured by the second sensor module to be zero and calculates a first current instruction value based on the error value, obtains a feed-forward term by dividing the power instruction value received from the converter control module by a load voltage value and multiplies the feed-forward term by an estimation phase of a general electric power system, thereby obtaining a second current instruction value, and generates the PWM signal for controlling the switch of the inverter based on an error value between a third current instruction value obtained by adding the first current instruction value to the second current instruction value and the current value measured by the third sensor module.