DC and AC Microgrids for Mining Applications

Abstract

The commitment of mining industry to reduction of greenhouse gas emissions necessitates enhancements in operational efficiency, electrification, and renewable-energy use. An effective way to integrate renewable resources into a mining electrical system is to utilize microgrids. This paper reviews DC and AC microgrid technologies, with a focus on coordination mechanisms between distributed generators, to achieve equitable sharing of the load power demand.The paper then discusses a specific (current-driven) control strategy for DC or AC microgrids, which uses minimal (or no) communication. The paper shows that, under this strategy, distributed generators of different ratings act in a coordinated manner and exhibit identical, first-order dynamics. Furthermore, the microgrid control is stable in the presence of any load types.The paper further discusses integration of Power Line Communication into the current-driven load sharing control. This can be used to redistribute inequalities in distributed generation resulting from faults and changed conditions. The technologies discussed in the paper offer distinct benefits to mining and other industries. Findings of the paper are supported by simulations.