Abstract
In order to improve the bus voltage robustness of distributed multi-source DC microgrid, a new cascade control method based on nonlinear virtual inertia and adaptive backstepping sliding mode is proposed. Firstly, the mathematical model of distributed multi-source DC microgrid with a buck–boost interface converter is analyzed and established. A nonlinear virtual inertia control method based on a variable droop coefficient is given by introducing the converter output voltage variation rate feedback term and a saturation function equation. Secondly, the voltage and current double closed-loop cascade controller is designed by using backstepping sliding mode control and adaptive algorithms. Finally, the system and cascade control models are built in MATLAB/Simulink for multi-case simulation. The feasibility and effectiveness of the proposed method is verified by comparing the results with traditional control methods.
Highlights
When distributed generation is connected to the grid, the DC microgrid can provide a flexible and efficient basic distribution layer
(3) Propose a three-level cascade control method that is based on a nonlinear virtual inertia control with droop variable coefficients and adaptive backstepping sliding mode voltage and current double closed-loop control
This paper proposes a nonlinear virtual inertia control method based on the variable U-I droop coefficient
Summary
When distributed generation is connected to the grid, the DC microgrid can provide a flexible and efficient basic distribution layer. For boost converters containing constant power loads in DC microgrid, without an accurate mathematical model and without stable dynamic systems, a nonlinear control method combining an accurate feedback linearization technique with adaptive backstepping sliding mode control (ABSMC) is proposed in the reference [27]. (3) Propose a three-level cascade control method that is based on a nonlinear virtual inertia control with droop variable coefficients and adaptive backstepping sliding mode voltage and current double closed-loop control. It achieves robust high stability of bus voltages in distributed multi-source DC microgrid.
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