Chapter 7 - Proactive defense system for enhanced resiliency of power grids with microgrids

Abstract

The market-oriented policies devised for emerging deregulated grid facilitates wider opportunities and associated challenges as well to the grid operators and stakeholders such as microgrid aggregators, fast and flexible reserve providers, load serving entities, and so on. How to turn these challenges to opportunities is the key to have a better prospect toward the evolving deregulated grid. Uncertainties associated with the renewables and limited reactive power support are prime concerns among these challenges hindering the prospect of widespread renewable dominant microgrid owing to the accompanying power quality issues. Even though researches cover the frequency regulation issues and counter measures in such uncertain deregulated grid, the disturbance propagation characteristics in such grids is emerging as a prime concern to be addressed. In congruent to this, the challenges posed by wide area propagation of disturbance instigated by renewable dominant uncertain microgrids in evolving deregulated market-oriented grid are investigated in this chapter. Besides, a proactive defense system that utilizes the characteristics of these disturbance propagation to mitigate the spread of the disturbance is presented and discussed. This defense strategy caters the ancillary service capabilities of microgrids itself to mitigate the disturbance spread caused by other microgrids. Case study conducted on NY-NE 16 machine 68 bus system substantiates the wide area propagation characteristics of disturbance induced by uncertain renewable dominant microgrid and efficacy of presented proactive defense strategy on alleviating the disturbance spread.