An Improved SRFPI-LADRC-based Voltage Control for Single-Phase Inverter

The linear active disturbance rejection control (LADRC) is extensively employed in various fields. It is characterized by model independence and excellent disturbance suppression. As a matter of fact, there is inherent tracking error when LADRC is applied to the inverter for tracking a sinusoidal signal. Given that the synchronous reference frame proportional-integral (SRFPI) controller can track the sinusoidal signal without steady-state error and provide a pair of orthogonal signals which can be employed as the reference signals of LADRC, an improved SRFPI-LADRC-based voltage control method for single-phase inverter is proposed in this paper. Detailed theoretical analyses are presented, which indicates the compound method owns the merits of the two controllers. Moreover, the contrast simulations are conducted to verify the effectiveness and superiority in MATLAB/Simulink. The results prove that the system achieves satisfactory voltage tracking error and steady-state error, fast transient performance, and low total harmonic distortion (THD).