Duty Ratio Optimization for a Multi-Level Polyphase Cascaded H-Bridge Grid-Interactive Inverter Using Model Predictive Current Control Based on Explicit Integration Algorithm

The model predictive current control is amongst the potent control strategies which have been used widely in the reformation of industrial varietal applications. It has the capacity to take many inputs and produce many outputs (MIMO) with its known through and through immaculate performance as well as its idiosyncratic stable control techniques. However, its requirements to solve an optimization challenge at each time step can be computationally intensive thereby affecting its real-time control application and impacting negatively on the system performance. In this paper, the idea of duty cycle optimization in accordance with the explicit integration approximation is introduced by application of zero and non-zero rectangular voltage in one control period to minimize current ripples in the grid-interactive system. In furtherance, the error minimization is chosen by the two-rectangular voltage duration. The throw-down total harmonic distortion and reduction in ripple current results are verified by experimentation and simulation.