Application of a Symmetric-Send-On-Delta event-based controller for a microalgal raceway reactor

In this paper, a new solution to improve the traditional control operation of raceway microalgae reactors is presented. The control strategy is based on an event-based method that can be easily coupled to a classical time-driven proportional-integral controller, simplifying the design process approach. The results of a standard Proportional-Integral (PI) controller, as well as of two event-based architectures, are presented in simulation and compared with each other and with traditional On/Off control. It is demonstrated that the event-based PI controller—operating during the whole day instead of only during daytime—achieves a better performance by reducing the actuator effort and saving costs related to gas consumption.

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Event-based selective control strategy for raceway reactor: A simulation study**This work has been supported by Cajamar Foundation and partially funded by the following projects: DPI2014- 55932-C2-1-R, DPI2014-56364-C2-1-R and DPI2012-31303 (financed by the Spanish Ministry of Economy and Competitiveness and EU- ERDF funds); Controlcrop P10-TEP-6174 (financed by the Consejería de Economía, Innovación y Ciencia de la Junta de Andalucía); CENIT VIDA (financed by the Spanish Ministry of Economy and Competitiveness and CDTI funds); and the UNED through a postdoctoral scholarship.

IFAC-PapersOnLine ◽

10.1016/j.ifacol.2016.07.388 ◽

2016 ◽

Vol 49 (7) ◽

pp. 478-483 ◽

Cited By ~ 2

Author(s):

A. Pawlowski ◽

I. Frenández ◽

J.L. Guzmán ◽

M. Berenguel ◽

F.G. Acién ◽

...

Keyword(s):

Simulation Study ◽

Control Strategy ◽

Selective Control ◽

Raceway Reactor ◽

Event Based

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Selective pH and dissolved oxygen control strategy for a raceway reactor within an event-based approach

Control Engineering Practice ◽

10.1016/j.conengprac.2015.08.004 ◽

2015 ◽

Vol 44 ◽

pp. 209-218 ◽

Cited By ~ 23

Author(s):

A. Pawlowski ◽

J.L. Mendoza ◽

J.L. Guzmán ◽

M. Berenguel ◽

F.G. Acién ◽

...

Keyword(s):

Dissolved Oxygen ◽

Control Strategy ◽

Oxygen Control ◽

Dissolved Oxygen Control ◽

Raceway Reactor ◽

Event Based

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Diurnal and nocturnal pH control in microalgae raceway reactors by combining classical and event-based control approaches

Water Science & Technology ◽

10.2166/wst.2020.260 ◽

2020 ◽

Vol 82 (6) ◽

pp. 1155-1165

Author(s):

E. Rodríguez-Miranda ◽

J. L. Guzmán ◽

M. Berenguel ◽

F. G. Acién ◽

A. Visioli

Keyword(s):

Experimental Tests ◽

Ph Control ◽

Control Algorithms ◽

Pi Control ◽

Night Time ◽

Control Approach ◽

Time Period ◽

Reducing Costs ◽

Raceway Reactor ◽

Event Based

Abstract The pH control in raceway reactors is crucial for an optimal performance of the system. Classical pH control is exclusively performed during the daytime period for cost saving reasons. This paper demonstrates that pH can be controlled 24 hours a day by using both a continuous-based and an event-based control approach, being able to improve the system's performance and reducing costs at the same time. Thus, experimental tests on a raceway reactor for several days are presented to show a comparison between traditional control algorithms during the daytime period versus an event-based control approach operating during both daytime and night-time periods. As a result, the combination of classical PI control for the daytime period and the event-based control for the night-time period is presented as a promising pH control architecture in raceway reactors.

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