Large scale space power systems such as NASA's Space Station Freedom pose significant challenges for autonomous control on-orbit. Conventional computer control techniques inherently emphasize highly structured algorithmic control code, which can deal with a predetermined set of specific contingencies. While expert system technology offers greater flexibility for system control, it introduces additional challenges for test and verification. This paper reports on recent work to combine the positive features of both classical and expert system control techniques in a hybrid, multiprocessor approach. Basic theory is presented, along with actual lab results from a prototype environment.