Method for controlling fault using switching technique of three phase four wire interlinking converter

A three phase four wire interlinking converter system, the system comprising:

• an inverter configured to convert a DC power to a three phase AC power and output the three phase AC power;
• and
• a processor configured to control switching components included in the inverter to control the three phase AC power output separately for each phase,
• wherein the processor is further configured to:
• obtain a first d-q-o coordinate plane based on an internal phase angle of an output voltage produced from each phase of the inverter;
• convert the first d-q-o coordinate plane to a second d-q-o coordinate plane based on an o-axis configured differently from the first d-q-o coordinate plane;
• obtain an output voltage vector for determining a fault location by performing d-q transform on the second d-q-o coordinate plane;
• determine occurrence of a fault and an area related to the fault based on the output voltage vector;
• and
• allocate a zero voltage vector to the area related to the fault.