Non-linear Backstepping based Control of an Islanded DC Microgrid with Constant Power Loads

The negative impedance characteristics of constant power loads (CPLs) and transient recovery stresses after fault isolation can cause system transient instability, load shedding and the possibility of load detriment in a microgrid if the conventional linear controllers are employed. With the complexity in the power distribution and the renewable integration, there is a need for an effective controlling technique with the attributes of the conventional controller; transient mitigating capability. This paper formulates a nonlinear backstepping control for the power electronic interfaces of an islanded DC microgrid giving a transient stability analysis for different contingencies incurring the system. The designed controller performance is validated using MATLAB/SIMULINK.