Robust Voltage Regulation if Unmanned Electric Vehicles

Abstract

Stable and reliable voltage supply is crucial for unmanned vehicle to operate safely and autonomously. The electrification of unmanned vehicle involves the widespread use of power electronics and the integration of large amounts of power electronics loads in DC distribution systems. These electronic loads typically exhibit non-linear load characteristics, and the circuit resistance exhibits nonlinear changes may cause system instability. Using traditional methods to control DC distribution systems with these non-linear loads will be a challenge. In this paper, a nonlinear controller-stabilized DC/DC buck converters integrated Robust control method is used to eliminate the DC bus voltage fluctuation caused by These nonlinear resistances. Firstly, the model takes the error between the state quantity and the reference quantity as the control object. Then, a Robust control algorithm is used to ensure the large signal stability of the system. Finally, a nonlinear controller was established. The proposed controller not only ensures the global stability of the circuit system under the operating conditions of these non-linear loads, but also has a fast dynamic response and precise tracking over a wide operating range. Simulation was performed to verify the proposed strategy.