A comparison of backstepping and LQG control for stabilizing MVDC microgrids with Constant Power Loads

This paper investigates the use of adaptive backstepping as a decentralized control strategy for voltage stability of DC microgrids where the loads and generators are interfaced through power electronic converters. The stabilizing control of the bus voltages resides in the generation side interfacing converters. The loads are tightly regulated and exhibit Constant Power Load (CPL) behavior. This can cause stability problems due to the CPL negative impedance characteristic. In order to solve this problem we introduce backstepping as a nonlinear control technique, which is compared to a Linear Quadratic Gaussian (LQG) controller from literature.