A Hybrid Energy Storage Converter Control Method Based on Dual-Loop LADRC

Hybrid energy storage converters can enhance photovoltaic power systems' dynamic response and stability. However, traditional linear controllers exhibit deficiencies when controlling bidirectional DC-DC converters. To address issues such as DC bus voltage sensitivity to nonlinear converter noise, photovoltaic output power, and load disturbances, a control strategy for hybrid energy storage converters based on dual-loop LADRC is proposed. A disturbance model of the main circuit is established by analyzing the operation principles of the hybrid energy storage converters. The design of a voltage-current dual-loop LADRC controller is completed based on this disturbance model, integrated with power division to achieve an overall control strategy for hybrid energy storage converters. Simulation results demonstrate that compared to traditional proportional-integral controllers, the dual-loop LADRC-based control strategy reduces DC bus voltage amplitude fluctuations by 39.4% and decreases settling time by 25.0%, exhibiting superior dynamic response and disturbance rej ection capabilities in power response and DC bus voltage support.