Low-Complexity Single Vector Based Model Predictive Control Under Nonideal Grid Conditions

To mitigate the adverse effects of the unbalanced grid voltages on the pulse width modulation (PWM) rectifier, a low-complexity model predictive control (LC-MPC) method of single vector is proposed based on the extended instantaneous power theory. Based on the elaborated analysis of PWM rectifier under unbalanced grid voltages, a new defined negative conjugate of complex power vector is as control variable, and the principle of selecting best voltage vector is deduced. Compared to LC-MPC based on conventional instantaneous power theory, the proposed strategy regulates the constant power references while no power compensation. Comparative study of the proposed method with conventional method is conducted under nonideal grid condition, and simulation results in the MATLAB demonstrate superior performance of the proposed LC-MPC strategy.