Abstract: To effectively solve the problem of stable control for DC-bus voltage in the independent photovoltaic

energy storage system under multi-source disturbances，a bidirectional DC-DC converter control scheme based on

improved linear active disturbance rejection control（LADRC）was proposed. The linearized small signal model of the bidirectional DC-DC converter was established，and the extended state observer with error proportional feedback was designed. Frequency domain characteristics analysis and simulation results demonstrate that this control strategy can effectively improve the DC-bus voltage tracking performance and disturbance rejection capability，and reduce the DCbus voltage fluctuation range under the condition ofmulti-source disturbances.

      Key words: DC-bus voltage；bidirectional DC-DC converter；linear active disturbance rejection control

（LADRC）；disturbance rejection capability