PRESSURE CONTROL METHODS FOR A PRESSURIZED COOLING SYSTEM WITH REPETITIVE CYCLES OF TRANSIENT DYNAMIC BEHAVIOR
1 online resource (284 pages) : PDF
University of North Carolina at Charlotte
Pressurizer (PZR) behavior in typical pressurized water reactor (PWR) nuclear power plants is well understood. Pressure control is relatively straightforward for a typical PWR, since the larger fluid system normally operates in a very steady state condition. However, pressure control is more complicated for a pressurizer in a pulsed cooling system, such as the cooling system for a tokamak fusion reactor. During normal operation the tokamak’s plasma is pulsed, instead of staying at a constant value, which results in temperature swings between the plasma pulses. This design characteristic means that (a) coolant temperatures fluctuate over a larger range during normal operation than typical PWRs experience and (b) fluid volume also varies as the coolant temperature changes, since fluid (water) density is a function of temperature.Pressurizer pressure control is typically accomplished with an on/off and proportional control strategy in PWRs. However, this approach alone may not meet the desired control performance for a pulsed cooling system. Therefore, a dynamic model based control design approach is proposed that permits modification online as the process dynamics change by uniquely combining a hybrid control technique with a method to improve system knowledge. This research includes contributions to PZR control modeling, dynamic simulation inputs, adaptive-optimal and adaptive-dynamic control, and system knowledge. Simulations support that this approach enables greater control of the process during transients than is achievable with a conventional control approach.
HYBRID CONTROLKALMAN FILTERLINEAR QUADRATIC REGULATORMINIMUM VARIANCE CONTROLPRESSURIZERRECURSIVE LEAST SQUARES IDENTIFICATION
Kakad, YogendraEbong, AbasifrekeSmith, K. Scott
Thesis (Ph.D.)--University of North Carolina at Charlotte, 2015.
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