Analysis and Verification of Compound SRFPI-LADRC Strategy for an Off-Grid Single-Phase Inverter

Summary. The linear active disturbance rejection control (LADRC) is mainly applied for tracking a step signal, and it inadequate to realize satisfactory performance in the of single-phase inverter whose reference signal sinusoidal. In this paper, an improved voltage strategy based on compound synchronous frame proportional-integral (SRFPI) LADRC proposed. SRFPI remain relatively independent without complicating parameter design. Detailed theoretical analyses its are presented, indicating that inherits advantages two controllers. Moreover, contrast experiments carried out verify feasibility superiority proposed strategy. results show system achieves small steady-state error, fast transient response, low total harmonic distortion (THD) when feeding highly nonlinear load.