Smart Microgrid Grounding

Why is ground fault monitoring important for a dc microgrid?

In addition to the protection schemes, ground fault monitoring techniques for the DC microgrid are also important. Detecting a high-resistance grounding fault proves a tough and challenging task for DC system safety. Traditionally, the methods of AC injection and DC leakage are widely used .

Why are DC microgrids important?

DC microgrids are expected to play an important role in maximising the benefits of distributed energy resources in future low carbon smart power systems. One of the remaining complex challenges is the requirement for effective DC protection solutions.

Why is a dc microgrid a multi-terminal protection system?

The topology of the DC microgrid is thus multi-terminal. And hence it becomes tricky to design a protection system flexible enough to deal with multiple numbers of terminals under a multi-directional power flow condition.

Can a dc microgrid network simulate a pole to ground fault?

Furthermore, a transient simulation for pole to ground faults in a DC microgrid network is performed with different earthing methods in order to investigate fault behaviour. The paper is organised as follows. Section 2 presents the different DC microgrid configurations.

How to protect a solidly earthed microgrid interface from overcurrent?

Thereby, for solidly earthed system, to protect a DC microgrid interfaced by two-level VSC against the overcurrent, fast-acting protection schemes are needed to isolate the faulted part in the appropriate timescale. Otherwise, equipment with higher ratings over-dimensioning will be required.

What is a microgrid system?

Finally, the conclusion is drawn in Section 6. A microgrid refers to an independent and autonomous system consisting of multiple distributed generators, energy storages, energy conversion devices, loads, monitors and protection devices. Thus this system is independently able to realize self-control, protection and management requirements.