The Limiter control component limits a user specified GSP output parameter to a predefined limit schedule during an OD simulation. A power setting component must be specified (specified on the Design tab sheet) in order to inform GSP what parameter to adapt in order to 'stay within limits'.
Multiple limiters can be used working on different parameters. Complex limit schedules can be specified by combining an expression with the 1-D lookup table and/or the 2-D map, similar to the schedule components.
The limiter always works using an extra equation that may be either active or inactive. At the start of every OD steady state or transient operating point calculation, the limiter equation is inactive. After convergence, the limit parameter is compared to the limit schedule. If exceeding, the operating point calculation is restarted with the limiter equation active (the equation error then is the deviation from the limit schedule) and the input of the user specified power setting component (in the Design tab sheet) becomes a state variable. The resulting operating point after the 2nd calculation will be exactly on the limit. Note that limiters, when active, require additional (roughly double) execution time.
Note that when active, any other scheduling (for example during steady-state series and transient calculations by the transient input tables) of the power setting is overruled by the Limiter component.
Hint: the Limiter does not work in Design point mode. It is suggested to use the Design Point Equation component for scheduling to limiting relations in Design Point mode.
Limiter
