This paper proposes a centralized robust controller for a partial feedback linearized model of a generalized DCDC voltage source converter in a standalone PV-BES system. Generally, a linear PI controller is applied to stabilize this type linearized model of power electronics interfaces; however, poor performance of such types of control schemes is observed under sudden change of operating points. To overcome this issue, this paper designs the centralized robust H-{\infty} mixed-sensitivity loop shaping controller for partial feedback linearized model of nonlinear DC-DC power electronics converter for the PV-BES system. The performance of the proposed controller is demonstrated under sudden generation change of solar PV system where storage capability also associated in using simulations of a Simulink.