Resumo

AISSA-BOKHTACHE, Aicha et al. Design of Predictive Controller Applied to a Discharge Lamp-electronic Ballast System. Rev Politéc. (Quito) [online]. 2025, vol.56, n.2, pp.29-36. ISSN 2477-8990.  https://doi.org/10.33333/rp.vol56n2.03.

This paper suggests an advanced control approach for enhancing the efficiency of Ultraviolet-C (UV-C) water sterilization systems. The main contribution of this work is the application of the model predictive control (MPC) in the power supply system for electronic ballasts using a 50 kHz single-phase full-bridge inverter, for the purpose of regulating the arc current through the discharge lamp to generate UV-C at 253.7 nm, improving radiation intensity and preserving the lifespan of a lamp, with particular attention given to achieving high-quality sinusoidal waveforms and minimizing total harmonic distortion (THD). This method solves severe problems like current oscillations, which adversely affect lamp life ultraviolet radiation stability, and the system stability as a whole. In achieving proper current regulation, the proposed approach increases water disinfection efficiency, inhibits survival of pathogenic microorganisms, and minimizes power loss and overheat. The MPC-based system performance is validated by making use of MATLAB tools and compared with the standard Proportional-Integral (PI) control scheme thus confirming the efficiency of the proposed control scheme. The results indicate that the predictive control technique maintains the sinusoidal current with 2.21 % THD, 65 % reduced compared to conventional PI control (6.00 % THD). Further, MPC rejects the load disturbances within 0.001 s, 50 % better compared to PI control (0.002 s), and tracks the reference signal with a steady-state error of less than 0.5 %. These are aspects of how model predictive control guarantees stable and efficient discharge lamp operation. This technique improves UV-C sterilizer reliability, lifetime, and disinfection efficiency.

Palavras-chave : Model predictive controller; Proportional-Integral controller; Single-phase full-bridge inverter; Ultraviolet radiation; water sterilization; discharge lamp-electronic ballast system.

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