Robust Non-fragile Fuzzy Control of DC Microgrid Containing Constant Power Load

The damping in DC microgrid will be decreased due to the cascade connection of the load possessing constant power characteristics with the converter at source side and it will affect the stability of the system. In allusion to this problem, the TS fuzzy model was adopted to establish the model for the nonlinear DC microgrid containing constant power load. To effectively resist the uncertainty of DC microgrid and parameters in control system, a robust non-fragile controller was designed, and on the basis of computing parameter uncertainty matrix the Lyapunov exponential stability condition stability condition expressed by linear matrix inequality wad derived. Results of Matlab/Simulink platform based simulation testing show that the designed controller can satisfy the demand of DC microgrid for stability, and can improve the transient performance of the close-loop system; besides, there is a stronger robustness for the uncertainty within the system and the controller.