UNDERSTANDING NONLINEAR LOADS AND …

UNDERSTANDING NONLINEAR LOADS AND GENERATOR SETINTERACTIONG regory M. Williams, Inc.(309) 578-4995 INTRODUCTIONMany electrical power applications require continuous andhigh quality power. Standby diesel-electric generatingsets are integral parts of the genset sizing requires an UNDERSTANDING of thegenset characteristics and the connected load . Nonlinearloads, including; uninterruptable power supply (UPS),variable frequency drives (VFD), adjustable speed drives(ASD), and switched mode power supplies, present a specialchallenge to successful delivery of high quality powerunder all operating conditions. UNDERSTANDING how thisequipment interacts is sets are inherently a high reactance sourcecompared to a LOADS , not generators , cause should be sized for NONLINEAR LOADS to reduceheating and voltage waveform distortion. Oversizing toequate distortion with a utility source may not load design should include circuits to acceptonly timing signals from the fundamental frequency andprovide some filtering of SCR commutation system component suppliers of a limited generator set supplier of NONLINEAR load details(clarify input and output , number of rectifieroutput pulses, other connected LOADS , etc.)

2 7. Caterpillar SR4 Generators do not require additional filters between generator and regulator. Three phase sensing and well-filtered voltage regulators ensure

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