Montero-Robina P. , Albea C. , GÓMEZ-ESTERN AGUILAR, FABIO, Gordillo F.
No
Control Eng. Pract.
Article
Científica
5.4
1.576
01/01/2023
000896969900005
2-s2.0-85141526582
This article revisits the modeling of the grid-connected neutral point-clamped converter as a time-varying nonlinear hybrid dynamical system. As a result, an embedded control law that guarantees stability and fulfills the control objectives, namely dc-link voltage regulation, power-to-grid energy exchange and capacitor voltage balancing, is proposed. In addition, a rigorous study of stability is carried out without depending on an averaged model and considering the hybrid dynamical character of the system. Moreover, the hybrid control guarantees a minimum dwell time. This approach could be extended to other topologies or control laws in the search for rigorous stability guarantee The algorithm is evaluated and tested experimentally, verifying the feasibility of the approach. This process involves adapting the algorithm to be programmed in a FPGA as well as some further modifications to improve the steady-state performance. The experimental results are performed under several reference changes and perturbations to prove the feasibility of the proposed approach. © 2022 Elsevier Ltd
Control theory; Dynamical systems; Electric power system control; Electric rectifiers; Nonlinear dynamical systems; Rectifying circuits; Control design; Control laws; Grid-connected; Hybrid controls; Hybrid dynamical systems; Hybrid model; Modelling and controls; Neutral-point clamped converters; NPC converter; Three-level; Voltage regulators