Real time symmetrical coordinate transformation applied for detection of imbalanced fault in utility power system

This paper has investigated the possibility of a real time symmetrical coordinate transformation. Simulation is performed when it is applied for detection of imbalanced fault in utility power system. The power conditioner is required to remain connected when the fault occurs in the utility power system under certain condition. This is called as the fault ride through (FRT) ability. The most popular fault is 1 line-to-ground fault. This fault causes the imbalance voltages and currents in 3-phase power system. To optimize the output from the power conditioner of the photovoltaic system, the detection of the imbalanced condition is important factor. In this paper, the signal processing method by using the complex number algebra in real time system is shown at first. The fast detection of the imbalanced condition is verified by the computer simulations. Then the effects of the harmonic components existing in the system voltage have been investigated. The generation of the offset output and the oscillating waveforms are indicated.