This paper presents a new control strategy to eliminate second harmonic of dc output current in the 3-phase unbalancednetwork voltage PWM current-source converters (CSC).
In this program the voltage and current of simultaneous faults or unbalanced power system are calculated by solving the simultaneous equations of multi-port network and of the fault boundary.
It is immune from the unbalanced status of network and the values of earthed resistance. To the complicated intermittent arc-earth fault, the proposed method also works well.