Data-driven control design applied to uninterruptible power supplies

Robust Current Estimation Applied to the Multiloop Resonant Control of Uninterruptible Power Supplies

“…In order to illustrate the proposed methodology, consider the 3.5 kVA commercial UPS presented in Corleta et al (2016) with parameters described in Table 1 and its corresponding nonlinear test loads under the specifications of IEC 62040-3 Commission (2011). With a resonant controller of N = 3 and a D-stability region with σ = 50 and ρ = 5000, optimization problem (19) results in γ = 1.59 and the following feedback gains: [320.10 395.80 237.41 457.47 170.59 497.17].…”

Virtual reference feedback tuning applied to cascade control

“…This particular control structure was considered in [26] for the data‐driven control of uninterruptible power supplies. Its main advantage is that it allows improvements in both reference tracking and disturbance rejection.…”

“…Considering the VRFT formulation for cascade loops, only a few references can be found in the literature [26, 27]. A VRFT approach based on two experiments and two reference models was considered in [26] aiming the closed‐loop control of uninterruptible power supplies. In this kind of plant, the use of cascade structures allows the arbitrary closed‐loop pole allocation, improving in this way the achievable transient performance.…”

“…In this work, we propose a systematic VRFT solution for two closed‐loop structures usually found in the cascade control literature by addressing points such as the number of experiments for data collection, reference model selection, optimal filter formulation and how to best use the degrees of freedom provided by the cascade loop. We also derive the optimal and practical filter formulation for the methods proposed in Corleta et al [26] and Jeng and Yeh [27] to cope with the case where the controller to be designed is underparameterised. In addition, we adapt VRFT in [26] to use data from one plant experiment and requiring the definition of a single reference model, instead of two experiments and two reference models as originally proposed.…”

“…We also derive the optimal and practical filter formulation for the methods proposed in Corleta et al [26] and Jeng and Yeh [27] to cope with the case where the controller to be designed is underparameterised. In addition, we adapt VRFT in [26] to use data from one plant experiment and requiring the definition of a single reference model, instead of two experiments and two reference models as originally proposed. Finally, we show through simulation examples that our VRFT solution and proposed filters achieve a behaviour closer to the desired one and also that both cascade structures provide improved disturbance rejection in the internal loop when compared to single‐loop structures.…”