Enhanced Linear Active Disturbance Rejection Control for Load-Side Boost Interface in Microgrid

Microgrid has drawn much attention as a key way of efficient utilization of multiple distributed energies, following it is difficult to continuously output high-quality electrical energy owing to various uncertain conditions. To this end, an enhanced linear active disturbance rejection control (ELADRC) based on reference-signal differential feedforward (RSDF) and the cascaded linear extended state observer with the deviation correction (LESO-DC) is proposed to address unknown modeling error and the unknown dynamics in the high-voltage interface converter. In this strategy, a control law with RSDF is adopted to optimize the tracking performance. According to the deviation control, the cascaded LESO-DC is introduced to correct the disturbance estimation signal, thereby improving anti-disturbance performance. Moreover, the immunity and stability of the ELADRC are analyzed by frequency domain analysis and Lyapunov theory theoretically. Finally, comparative experiments are conducted on a 40-kW test platform based on SiC and demonstrated the effectiveness of the proposed control approach.