The purpose of this study is to use closed loop controllers to examine the dynamic and steady state performance of a cascaded H-Bridge multilevel inverter (CHBMLI). For addressing a range of problems, an MLI system should use a dual loop cascaded controller. An outer loop and an inner loop comprise its composition. Proportional-Integral (PI) controllers are used for controlling voltage in the outer loop while proportional (P) controllers are used for controlling current in the inner loop. A voltage controller helps to achieve steady state voltage, or a constant output voltage, while a current controller reduces the transient/dynamic period—the amount of time needed to reach steady state—in less time. A single controller is used for both linear and nonlinear loads. In this work, the MATLAB/SIMULINK platform is utilized to develop the closed loop CHB-MLI model. The controller parameters, integral gain (Ki) and proportional gain (Kp), are selected with care. These two parameters are changed in both loops to determine the steady state and dynamic performance of a CHB-MLI for linear load. The analysis of steady state performance under non-linear load involves using the same controller and controller parameter settings as for linear load.

CHB-MLI, Dual Loop Cascaded Controller, Dynamic Performance, Non-linear Load, Linear Load.