Stability Assessment of Power Grids with High Microgrid Penetration

This chapter discusses the analysis of the impact of high levels of microgrid (MG) penetration on power system stability from various points of view such as frequency stability, small‐signal stability and voltage performance. Methods for interpreting system dynamics in terms of simplified system representations are developed, and criteria to determine maximum penetration levels are given using deterministic and statistical sensitivity analyzes. A systematic methodology for the analysis of the impact of distributed MGs on power system dynamic behavior is proposed. It is well known that MGs are realized in the low and medium voltage levels. Therefore, following the calculation of maximum penetration levels of MGs, the chapter tries to determine the maximum active power that MGs can inject into each bus of the distribution system without causing steady‐state voltage violations.