Inverter apparatus and solar power generation system

An inverter apparatus comprising:

• a first switch group that is connected to a DC power source and includes a first switch and a second switch connected in series;
• a capacitor that has one end thereof connected to a first connection point between the first switch and the second switch;
• a second switch group that is connected in parallel with the capacitor and includes a third switch and a fourth switch that are connected in series;
• a switch control section that controls an ON/OFF state of the first switch, the second switch, the third switch, and the fourth switch to convert DC voltage from the DC power source into AC voltage and output the AC voltage from a second connection point between the third switch and the fourth switch;
• and
• a smoothing circuit that is connected to the second connection point and normalizes a pulse waveform of the AC voltage, wherein
• the switch control section turns the first switch and the second switch ON and OFF in an alternating manner while the third switch stays ON and the fourth switch stays OFF, and turns the third switch and the fourth switch ON and OFF in an alternating manner while the first switch stays ON and the second switch stays OFF.

An inverter apparatus comprising:

• a first switch group that is connected to a DC power source and includes a first switch and a second switch connected in series;
• a capacitor that has one end thereof connected to a first connection point between the first switch and the second switch;
• a second switch group that is connected in parallel with the capacitor and includes a third switch and a fourth switch that are connected in series;
• a switch control section that controls an ON/OFF state of the first switch, the second switch, the third switch, and the fourth switch to convert DC voltage from the DC power source into AC voltage and output the AC voltage from a second connection point between the third switch and the fourth switch;
• and
• a smoothing circuit that is connected to the second connection point and normalizes a pulse waveform of the AC voltage, wherein
• the inverter apparatus is connected to a three-phase AC power source, and
• the switch control section controls the ON/OFF state of the first switch, the second switch, the third switch, and the fourth switch to output from the smoothing circuit shifted AC voltage obtained by shifting a reference AC voltage, with which the AC voltage is to be phase-synchronized, in a positive direction by a predetermined potential, from a reference potential of the reference AC voltage.