Stability Enhancement of Battery-Testing DC Microgrid: An ADRC-Based Virtual Inertia Control Approach

Power batteries play a vital role in electric vehicle (EV) industry. To evaluate their charging and discharging performance and achieve energy recovery, a power accumulator battery testing system (PABTS) based DC-microgrid (DC-MG) is proposed. However, during battery testing, frequent charging and discharging current test may endanger the stability of the PABTS DC-MG. Although, the traditional virtual inertia control (VIC) approach can stabilize the DC-bus voltage, its anti-interference ability is still limited. To solve this problem, an active disturbance rejection control (ADRC) based VIC control scheme is proposed, wherein the VIC approach provides virtual inertia for the system, and the ADRC is derived and modeled using the first-order virtual inertia equation. The external and uncertain internal disturbances in the system are considered for the total disturbance estimation. This disturbance is suppressed by feedback compensation, thereby greatly improving the system robustness. Finally, the effectiveness of the proposed ADRC-VIC method is further verified by experimental results on the laboratory hardware prototype under different scenarios.