Analysis for Reduced-order Model of a Typical Photovoltaic-battery Hybrid Power System

In this paper, a small signal model of independent photovoltaic-battery hybrid power system (PBHPS) is proposed. Based on the complete small signal model of PBHPS, participation factor analysis of the system is conducted, and the state variables highly correlated with DC voltage dominant mode are identified. On this basis, keeping these highly correlated variables, the reduced-order small signal model of the system is deduced. Compared with the complete small signal model of the system, the reduced-order model equates the photovoltaic power supply to a constant power source. It can reduce the order of the state matrix and amount of computation.