Abstract
The modeling and control design of the Power Extension Package (PEP), to be deployed from the Shuttle bay by the Remote Manipulator System, is described. The power package is regarded as the first Large Space Structure (LSS), having performance and disturbance rejection requirements which impose control bandwidths near the frequency range of structural resonances. Modeling fidelity is found to be a critical component of control design for LSS, and is discussed for the PEP in terms of the sun pointing control. Orbiter maneuvering rates, plume loads, and structural dynamics are examined, and it is noted that the control loop must be phase stable over a wide frequency range, with final crossover occurring at a hundred times the nominal rigid body crossover.