CONTROL OF RESONANCE IN A 20KHZ SPACE POWER SYSTEM

THE 20 KHZ POWER SYSTEMS, CURRENTLY BEING CONSIDERED FOR THE SPACE STATION AND ADVANCED SPACECRAFT, DEMONSTRATE HARMONIC RESONANCES DUE TO INTERACTION BETWEEN THE SWITCHINGOF THE CONVERTERS AND THE DISTRIBUTION SYSTEM. IN SOME CASES, THE HARMONIC RESONANCE BECOMES SO SEVERE THAT IT MAY CAUSE COMPONENT DAMAGE AND ELECTROMAGNETIC INTERFERENCE. CONTROLLED SUPPRESSION OF THESE HARMONIC RESONANCE FREQUENCIES IS NECESSARY IN ORDER TO ACHIEVE SATISFACTORY SYSTEM OPERATION. THE PURPOSE OF THIS RESEARCH IS TO INVESTIGATE METHODS OF FILTERING THE HARMONIC FREQUENCIES BYUSING EITHER PASSIVE OR ACTIVE FILTERING AT THE LOAD AND/OR SOURCE INTERFACE. THIS WORK SHOULD PROVIDE A MEANS, OR AT LEAST, SET GUIDELINES, FOR FILTER DESIGN. ONCE THIS IS ACHIEVED, THE STAGE WOULD BE SET FOR PHASE II RESEARCH. WORK IN PHASE II WOULD BE DIRECTED TOWARD DEVELOPING DETAILED MODELS OF TYPICAL SPACECRAFT POWER SYSTEMS, OR SUBSYSTEMS, THEREBY ESTABLISHING A SIMULATED TEST BED WHICH COULD BE USED TO INVESTIGATE AND DESIGN AUTOMATION TECHNIQUES FOR AUTONOMOUS SYSTEMS BEFORE COMMITTING TO HARDWARE. THIS WOULD PROVIDE MSFC, AND NASA IN GENERAL, WITH A UNIQUE DESIGN TOOL. A SECOND ASPECT OF PHASE II RESEARCH WOULD BE TO DEVELOP AND VERIFY REDUCED ORDER MODELSOF THE POWER SYSTEM COMPONENTS FOR USE IN A DIGITAL SIMULATION OF THE OVERALL SYSTEM. IF SUCCESSFUL, THIS WOULDPROVIDE MSFC WITH IN-HOUSE CAPABILITY TO CONDUCT EXTENSIVE AUTONOMOUS CONTROL RESEARCH.