Robust Flatness-Based Control With Nonlinear Observer for Boost Converters

Shahrouei, Zohreh; Rahmati, M.; Gavagsaz-Ghoachani, Roghayeh; Phattanasak, Matheepot; Martin, Jean‐Philippe; Pierfederici, Serge

doi:10.1109/tte.2022.3192217

Cited by 14 publications

(4 citation statements)

References 36 publications

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“…where 𝜁 is the damping factor, and 𝜔 𝑛 is the cutoff angular frequency corresponding to the control bandwidth of the controlled system [65]- [66]. Thanks to the energy controller, the current reference 𝑖 𝑟𝑒𝑓 can be obtained.…”

Section: Energymentioning

confidence: 99%

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Local-Stability Analysis of Cascaded Control for a Switching Power Converter

Afkar,

Gavagsaz-Ghoachani,

Phattanasak

et al. 2024

Journal of Robotics and Control

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Switching power converters are integral in various applications like transportation and renewable energy. After their design, ensuring stable closed-loop poles is critical to maintain safe operating conditions. This study focuses on a switching DC-DC boost converter with a cascade control approach using an energy controller for the outer loop and indirect-sliding mode control for the inner loop. The research objective involves investigating stability through eigenvalue evaluation at different operating points. A large-signal average model is applied to make controlled performance independent of the operating point by fixing system poles. Nonlinear controllers, specifically indirect-sliding mode control, are chosen for their robustness, constant switching frequency, and implementation ease. Results indicate that insufficient decoupling leads to eigenvalue displacement, impacting control parameter choices. The research contribution is investigating the local stability of cascaded control, considering its advantageous implications for both performance and design. This study contributes to the understanding of switching power converters' stability, emphasizing the proposed methodology's broader applicability to diverse converter structures. The proposed approach, applicable to various switching power converters, sheds light on the importance of proper decoupling between outer and inner loop dynamics.

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Section: Energymentioning

confidence: 99%

“…A comparison to a similar method from previous works [65] to enhance research contributions is provided in this section. The previous work is redesigned using the same bandwidth of both controller loops.…”

Section: ) Comparison To Pi Controllermentioning

confidence: 99%

Local-Stability Analysis of Cascaded Control for a Switching Power Converter

Afkar,

Gavagsaz-Ghoachani,

Phattanasak

et al. 2024

Journal of Robotics and Control

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“…Ensuring proper control over the output voltage of a boost converter is crucial, particularly in applications that require the input voltage to remain within an acceptable range (±10%) due to the sensitivity of these specific applications. In [37], some control methods have been compared to each other. The comparison criteria in [37] include the number of control loops and the number of sensors.…”

Section: B Control Of Boost Convertersmentioning

confidence: 99%

“…In [37], some control methods have been compared to each other. The comparison criteria in [37] include the number of control loops and the number of sensors. If there are two control loops, typically the dynamics of the loops are separated [38]- [42].…”

Section: B Control Of Boost Convertersmentioning

confidence: 99%

Nonlinear Cascaded Control for a DC-DC Boost Converter

Mansouri,

Gavagsaz-Ghoachani,

Phattanasak

et al. 2023

Journal of Robotics and Control

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The Boost Converter is a type of DC-DC converter that operates using switching techniques and is designed to elevate the voltage level. This paper presents a cascaded control for a boost converter to ensure that the inductor current and output capacitor voltage remain in a safe operating zone. Ensuring safe operating conditions and stable closed-loop poles is crucial because it guarantees that both current and voltage remain within the designated operating range. This preventive measure prevents any damage to components like capacitors (C), inductors (L), and switches. Unstable operation, on the other hand, could lead to oscillations and an undesirable increase in the amplitude of current and voltage, posing a risk to all components involved. The research contribution involves an investigation of cascaded control, utilizing power and energy concepts due to their advantageous effects on system performance and design. By implementing nonlinear controllers based on a large-signal averaged model, the closed-loop poles remain independent of operating points, eliminating the need for small-signal linearization. Small-signal linearization makes the controlled system dependent on the operating point. Two controllers are introduced based on power and energy concept, which is easy to understand. The potential practical application of the proposed cascaded control approach is in high-power applications. Tracking the energy stored in the output capacitor is first investigated to validate the proposed control scheme by varying the output voltage reference from 32 V to 50 V. Then, the regulation of the energy voltage is explored by varying the load resistance for the output voltage at 50 V. Both are done using a switched model using MATLAB/Simulink software. Simulation results are given to demonstrate the effectiveness of the proposed method. The key metrics used to assess the effectiveness of the proposed control scheme are the undershoot voltage and robustness. The results show that the studied system's tracking, regulating operations and robustness properties are as expected. The proposed method faces a challenge with the number of sensors required. To address this, observers can be utilized to reduce sensor usage while maintaining measurement accuracy. The proposed method can be applied to other power electronic systems.

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Improved dynamic performance of triple active bridge DC-DC converter using differential flatness control for more electric aircraft applications

Ahmed Adam,

Chen,

et al. 2024

Results in Engineering

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Robust Flatness-Based Control With Nonlinear Observer for Boost Converters

Cited by 14 publications

References 36 publications

Local-Stability Analysis of Cascaded Control for a Switching Power Converter

Local-Stability Analysis of Cascaded Control for a Switching Power Converter

Nonlinear Cascaded Control for a DC-DC Boost Converter

Improved dynamic performance of triple active bridge DC-DC converter using differential flatness control for more electric aircraft applications

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