Control Scheme for Power Quality Improvement in Islanded Microgrid Operation

The growing demand for reliable, flexible and high quality power with a concern for environment has lead to the concept of microgrid. When the microgrid is islanded either by fault or by design, it creates number of control challenges with respect to stability, power quality and harmonics. Control of Islanded microgrid is even more challenging due to the penetration of large number of intermittent Distributed Renewable Energy Sources (DRES) such as wind and solar. This paper proposes a control scheme to improve the power quality through voltage sag mitigation of islanded microgrid by injecting reactive power using Distribution- Static compensator (D-Statcom). The simulation results show that the proposed control scheme provides required voltage stability under Voltage Sag, thereby improves the power quality in an Islanded microgrid. The simulations are carried out in MATLAB/Simulink environment.