State variable analysis of dc-dc converters

In spacecraft power systems, different voltage and current levels must be available for different loads. In addition, the source for the spacecraft power system may generate low voltage and high current which must be converted to high voltage and low cur rent for transmission to the loads. Therefore, dc-dc converters are an integral part of dc spacecraft power systems. The power requirements for future spacecraft power systems are such that dc-dc converters may need to be connected in series and parallel to supply the load. To simulate such converter systems, a modular dc-dc converter model is developed using state variable tech niques. The state model for each converter in the system is solved using the state transition matrix method. A test system consisting of two boost converters connected in series supplying a resistive load is simulated and compared to a SPICE simulation.