An inverter control circuit for a utility interactive inverter system configured to generate and output PWM signals for controlling an operation of a plurality of switching devices in a three-phase inverter circuit of the utility interactive system, the output of the three-phase inverter circuit supplying power to a three-phase power system, wherein the inverter control circuit is configured to generate PWM signals to ensure that a waveform of a phase voltage outputted from the three-phase inverter circuit through a low-pass filter is zero in a first one-third period of a cycle, is a sine wave corresponding to a phase from 0 to 2n/3 in a subsequent one-third period of the cycle, and is a sine wave corresponding to a phase from n/3 to n in a remaining one-third period of the cycle, the inverter control circuit comprising: a target value signal generator configured to generate a first target value signal, a second target value signal and a third target value signal, the first target value signal having a waveform which is zero in the first one-third period of the cycle, is a sine wave corresponding to a phase from 0 to 2n/3 in the subsequent second one-third period of the cycle, and is a sine wave corresponding to a phase from n/3 to n in the remaining one-third period of the cycle, the second target value signal having a phase advanced by 2n/3 from the first target value signal, the third target value signal having a phase delayed 2n/3 from the first target value signal; and a PWM signal generator configured to generate the PWM signals based on the target value signals; wherein the target value signal generator includes: a phase voltage control signal generator configured to generate three phase voltage control signals Xu, Xv and Xw, the generation of which is based on a detected signal of three-phase current outputted from the three-phase inverter circuit, a detected signal of DC voltage inputted to the three-phase inverter circuit and a detected signal of three-phase line voltage of the three-phase power system; a control signal converter configured to convert the three phase voltage control signals into line voltage control signals Xuv = Xu - Xv, Xvw = Xv - Xw and Xwu = Xw - Xu, representing differences between the three phase voltage control signals Xu, Xv and Xw; and a signal generator configured to generate the first to the third target value signals, which are based on switching between the respective line voltage control signals and a zero signal whose value is constantly zero. a target value signal generator configured to generate a first target value signal, a second target value signal and a third target value signal, the first target value signal having a waveform which is zero in the first one-third period of the cycle, is a sine wave corresponding to a phase from 0 to 2n/3 in the subsequent second one-third period of the cycle, and is a sine wave corresponding to a phase from n/3 to n in the remaining one-third period of the cycle, the second target value signal having a phase advanced by 2n/3 from the first target value signal, the third target value signal having a phase delayed 2n/3 from the first target value signal; and a PWM signal generator configured to generate the PWM signals based on the target value signals; a phase voltage control signal generator configured to generate three phase voltage control signals Xu, Xv and Xw, the generation of which is based on a detected signal of three-phase current outputted from the three-phase inverter circuit, a detected signal of DC voltage inputted to the three-phase inverter circuit and a detected signal of three-phase line voltage of the three-phase power system; a control signal converter configured to convert the three phase voltage control signals into line voltage control signals Xuv = Xu - Xv, Xvw = Xv - Xw and Xwu = Xw - Xu, representing differences between the three phase voltage control signals Xu, Xv and Xw; and a signal generator configured to generate the first to the third target value signals, which are based on switching between the respective line voltage control signals and a zero signal whose value is constantly zero.