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Some controllers include the option to limit the "ramp up % per minute". This option can be very helpful in stabilizing small boilers (3 MBTUH), especially during the summer, during light loads. A utility boiler "unit may be required to change load at a rate of as much as 5% per minute (IEA Coal Online - 2, 2007)".<ref>{{cite web |url=http://www.seeei.org.il/prdFiles/2702_desc3.pdf |access-date=2014-04-07 |url-status=live |archive-url=https://web.archive.org/web/20140805131600/http://www.seeei.org.il/prdFiles/2702_desc3.pdf |archive-date=2014-08-05 |publisher=ABB |title=Energy Efficient Design of Auxiliary Systems in Fossil-Fuel Power Plants |page=262 }}</ref>{{failed verification|reason=Source does not talk about controllers on this page.|date=May 2020}}
It is possible to [[filter (signal processing)|filter]] the PV or error signal. Doing so can help reduce instability or oscillations by reducing the response of the system to undesirable frequencies. Many systems have a [[resonant frequency]]. By filtering out that frequency, stronger overall feedback can be applied before oscillation occurs, making the system more responsive without shaking itself apart.
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