Open phase detection system for power conversion system

An open phase detection system for a power conversion system including an inverter and a plurality of LC filters, the inverter having a plurality of AC output terminals, the LC filters each being constituted by a reactor and a capacitor and being connected to each of the plurality of AC output terminals;

• the open phase detection system comprising:
• a first current detection unit for detecting a current flowing through the reactor of each of the plurality of LC filters;
• a second current detection unit for detecting a current flowing through the capacitor of each of the plurality of LC filters;
• a phase difference abnormality detection unit for outputting a phase difference abnormality signal when an absolute value of a phase difference between a current flowing through the reactor connected to one AC output terminal of the plurality of AC output terminals and a current flowing through the capacitor connected to the one AC output terminal is equal to or smaller than a phase threshold value;
• an amplitude difference abnormality detection unit for outputting an amplitude difference abnormality signal when an absolute value of a value based on an amplitude difference between the current flowing through the reactor connected to the one AC output terminal and the current flowing through the capacitor connected to the one AC output terminal is equal to or smaller than an amplitude threshold value;
• and
• an open phase determination unit for outputting an open phase signal when receiving inputs of both the phase difference abnormality signal and the amplitude difference abnormality signal.