To clarify:
There is no persistent offset in (proportional + integral (PI) control but there is a persistent offset in proportional-only (P) control. The effect of the integral action in a (well tuned) PI controller is to reduce the offset to zero on a timescale comparable to the response time of the plant. If this response time is short compared to the timescales of interest in the simulation, as it is for most HVAC loops (excluding zone temperature control and thermal storage tank control), then PI control is a very good approximation to the ideal control assumed in EnergyPlus.
Phil
On 5/20/2012 4:48 PM, Ooi wrote:
This was explained last week. The time step integration among the simulation managers is something better than PI, i believe. In PI control, there will be an offset from the setpoint. EP Simulation does not have these offset. It was explained that the offset depends on the proportional band, which is very closely related to gain in the P.
Hopw this helps.
ooi
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "ohchoen" <ohchoen@...> wrote:
>
> Hi, I'd like to know that it is possible P or PI Control using EP.
> is it possible??
>
-- Philip Haves Leader, Simulation Research Group Lawrence Berkeley National Laboratory One Cyclotron Road, MS 90R3111 Berkeley, CA 94720-8134 (510) 486 6512 (office) (510) 486 4089 (fax)
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