PDF Publication Title:
Text from PDF Page: 092
Chapter 4. Explicit/Multi-Parametric MPC Control of PSA Systems During the online operation (second step), as shown in Figure 4.14, as soon as the plant measurements are provided, the explicit/multi-parametric controller searches for the particular critical region corresponding to the measurement set, out of the 22 such regions, and extracts the corresponding control law. 4.5.1 Closed Loop Validation To evaluate the performance of the designed controllers, a step increase of the PSA feed flow rate by 10 % from its design value is carried out and closed loop simulations are conducted with tuning factor R in Eq. (4.26) varying from 5 to 100. Here, the high fidelity PDAE model acts as the virtual plant. Figure 4.15 compares the closed loop performance of the derived mp-MPC controller configurations, with each curve corresponding to the reduced models designed in the system identification step. The closed loop simulation results are presented in terms of two PSA controller performance indicators; the controller response time, defined as the minimum number of PSA cycles required to permanently raise the hydrogen purity levels above the set point of 99.99 %, and the mean control effort (∆u) performed by the controller during the response time. The maximum change in manipulative variable (maximum ∆u) during the response time is also calculated - large value highlights any violation of operational constraints on adsorption time changes, as mentioned in section 4.5. From the plots in Figure 4.15, it is evident that increasing R slows down the controller response time (first performance indicator) while the mean control effort (second performance indicator) decreases. This behavior can be attributed to the particular type of objective function used in Eq. (4.26). It is also interesting to observe that even though the reduced models with tswitching at 20 and 79 are different in terms of the input signal switching time, purity response and model fits, they have similar closed loop performance. This is in sharp contrast to the 92PDF Image | Operation and Control of Pressure Swing Adsorption Systems
PDF Search Title:
Operation and Control of Pressure Swing Adsorption SystemsOriginal File Name Searched:
Khajuria-H-2011-PhD-Thesis.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)