Research on Nonlinear Control for Power Supply Control Device in Space-Borne Full Regulation Power Bus Platform

As the power level of the power system with fully regulated power bus in space-borne distribution system increases and the load scale and diversity becomes more and more complicated, the investigation of control for power supply control device has gradually been in a hot research topic. In this paper, a nonlinear model of non-isolated bidirectional DC/DC converter used in battery charge and discharge control was established, and nonlinear state space description was derived by adopting large signal modeling. Then, a linear space mapping was deduced by virtual output construction according to condition of state feedback linearization, and design of state feedback controller was implemented by analyzing the influence of circuit parameters to system characteristics based on two-order classical control system of linear space. Finally, simulation and experiment are implemented respectively by using simulation platform and developing an experimental prototype. The control method proposed in this paper could implement accurate and fast track power instruction function when battery charges or discharges, and has strong robustness against power bus voltage disturbances, load sudden change and deviation of system parameters, etc.