Asymmetric faults in independent microgrids

What is the current limiting strategy against symmetrical faults?

Current limiting strategy against symmetrical faults is a straightforward task since the negative sequence component does not exist , . Also, in the case of a balanced current control strategy under an unbalanced fault, again, the current limitation can be done easily due to the lack of negative sequence currents .

Can a solar-wind hybrid microgrid detect unsymmetrical faults?

In this paper, the unsymmetrical fault assessment has been done in a solar–wind hybrid microgrid, monitoring the MRA of DWT and ST-based skewness, kurtosis, RMS, mean, median and mode value-based best-fit parameters. The organisation of this paper is as follows: firstly, the limitations of frequency scan for fault detection have been established.

What is the difference between asymmetrical and symmetrical faults?

Symmetrical faults (SFs), characterized by a balanced distribution of fault currents across the three phases, and asymmetrical faults (AFs), entailing uneven fault impedances among the phases, are formidable challenges that demand astute handling.

Is there a conflict of interest in a microgrid?

The authors declared that there is no conflict of interest. S. F. Zarei, H. Mokhtari, and F. Blaabjerg, “Fault detection and protection strategy for islanded inverter-based microgrids,” IEEE Journal of Emerging and Selected Topics in Power Electronics, 2019.

Is there an unbalanced current limiting strategy for grid faults?

has investigated current limitation under grid faults considering active and reactive power injection. It is concluded that due to the different types of faults in the grid, finding a unique current limitation scheme is difficult . Proposing an unbalanced current limiting strategy is the main aim to be achieved in this paper.

Does fault type affect the performance of a grid-connected inverter?

The strategy is not affected by fault type and severity. The performance is verified under transient and steady-state condition. The performance is verified under unbalanced-harmonically-polluted grid voltages. Grid-connected inverter plays an essential role as an interface between energy resources and the power grid.