Methods and systems for detecting and recovering from control instability caused by impeller stall
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United States of America Patent
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Nov 21, 2017
Grant Date -
Dec 17, 2015
app pub date -
Jan 24, 2014
filing date -
Jan 25, 2013
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Abstract
Methods and systems for detecting and recovering from control instability caused by impeller stall in a chiller system are provided. In one embodiment, an impeller stall detection and recovery component of a chiller control unit calculates a control error signal frequency spectrum for an evaporator leaving water temperature, determines whether a high frequency signal content of the control error signal frequency spectrum exceeds acceptable limits, and adjusts a surge boundary control curve downward by a predetermined incremental value in order to resolve instability caused by impeller stall.
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