A Modified LADRC-Based DC-Link Voltage Controller for Photovoltaic Grid-Connected Inverters

To enhance the robust stability of dc-link voltage in photovoltaic (PV) grid-connected system, a modified linear active disturbance rejection control (LADRC)-based regulation strategy is presented this paper. The proposed equipped with cascaded extended state observer, which can supplement information not estimated by conventional one, thereby achieving relatively fast and accurate reconstruction. tracking performance LADRC are discussed studied frequency domain. Finally, experimental results provided to verify theoretical analysis.