Sequential Modulated Predictive Voltage Control of LC-Filtered Inverter

Two-level voltage source inverters (2L-VSIs) with output LC filters are widely used in uninterruptible power supplies, distributed power generation, and microgrids. This paper proposes a novel sequential modulated model predictive voltage control scheme to control the load voltages and inverter currents of the 2L-VSI in a decoupled manner without the need for weighting factors. In this proposed scheme, two cost functions, each targeting the load voltages and inverter currents of the 2L-VSI, are deployed sequentially, rather than integrated into a dual-objective cost function. This eliminates the need for a weighting factor to balance the two control objectives while retaining the benefits of a modulated model predictive voltage control scheme such as constant switching frequency, fast transient response, lower total harmonic distortion, and reduced steady-state error. The performance of the proposed control scheme is validated through MATLAB simulations on a 10 kW system with linear and nonlinear loads and compared with the classical modulated model predictive voltage control.