A time-domain stability analysis method for paralleled LLC resonant converter system based on Floquet theory

Li, Hong; Jiang, Xiaheng; Zou, Ying; Liu, Chen

doi:10.1016/j.microrel.2020.113849

Cited by 5 publications

(2 citation statements)

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“…Whereas the needs for higher efficiency, reliability, modularity in high electronics power, multicellular converters are on the rise. Studies [3][4][5][6] based on a parallel multiphase topology have shown that the latter provides better performance, lower losses, reduced cost, and fast dynamic responses. Parallelconnected multi-cell DC-DC converters have an important role in several applications such as inverters, powertrain systems and equipment of the power factor correction and they have countless advantages, the major one is to enhance performances such as energy efficiency and high capacity [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Robust Adaptive Feedforward Sliding Mode Current Controller for Fast-Scale Dynamics of Switching Multicellular Power Converter

Hamdi¹,

Hamida²,

Bennis³

et al. 2021

Adv. sci. technol. eng. syst. j.

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Higher efficiency and lower losses are widely considered as the best metrics to optimize, in a high-power converter performance context. To provide a solution to the ever-increase of high switching frequencies challenges, we must explore soft-switching technologies to resolve interface issues and reduce the switching losses. This manuscript describes a comparative analysis between the fixed-bandwidth (FBW) and the variable-bandwidth (VBW) of the hysteresis modulation (HM) based on the conventional sliding mode (CSM) strategy. The two adopted techniques are applied to a bidirectional multichannel DC-DC asynchronous Buck converter. The cells are parallel-connected and operating in continuous conduction mode (CCM). The objective is to have a system that is more stable, more efficient and able to cope with variations in input voltage, load and desired output voltage. That requires, first, to attenuate the non-linearity phenomenon of the conventional sliding mode by placing a hysteresis modulation. Then, after applying this technique, we confronted the dilemma of the variable switching frequency. Our hypothesis was to incorporate a variable bandwidth of the hysteresis modulation. The results obtained under parametric variation clearly show the areas where significant differences have been found between the two approaches. Likewise, they both share several key features. Simulation studies in the MATLAB ® / Simulink ™ environment are performed to analyze system performance and assess its robustness and stability.

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Section: Introductionmentioning

confidence: 99%

Robust Adaptive Feedforward Sliding Mode Current Controller for Fast-Scale Dynamics of Switching Multicellular Power Converter

Hamdi¹,

Hamida²,

Bennis³

et al. 2021

Adv. sci. technol. eng. syst. j.

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show abstract

“…This converter can be used to step down the voltage and transfer power between batteries. The introduction of unidirectional DC-DC converters, simplifies design, reduces cost and encourages adoption in low-cost cars [3]. The power distribution network also has the ability to detect faults in auxiliary loads as well as turn these loads on and off.…”

mentioning

confidence: 99%

On modeling and real-time simulation of a robust adaptive controller applied to a multicellular power converter

Hamdi

Hamida

Bennis

2022

Electrical Engineering & Electromechanics

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Introduction. This paper describes the simulation and the robustness assessment of a DC-DC power converter designed to interface a dual-battery conversion system. The adopted converter is a Buck unidirectional and non-isolated converter, composed of three cells interconnected in parallel and operating in continuous conduction mode. Purpose. In order to address the growing challenges of high switching frequencies, a more stable, efficient, and fixed-frequency-operating power system is desired. Originality. Conventional sliding mode controller suffers from high-frequency oscillation caused by practical limitations of system components and switching frequency variation. So, we have explored a soft-switching technology to deal with interface problems and switching losses, and we developed a procedure to choose the high-pass filter parameters in a sliding mode-controlled multicell converter. Methods. We suggest that the sliding mode is controlled by hysteresis bands as the excesses of the band. This delay in state exchanges gives a signal to control the switching frequency of the converter, which, in turn, produces a controlled trajectory. We are seeking an adaptive current control solution to address this issue and adapt a variable-bandwidth of the hysteresis modulation to mitigate nonlinearity in conventional sliding mode control, which struggles to set the switching frequency. Chatter problems are therefore avoided. A boundary layer-based control scheme allows multicell converters to operate with a fixed-switching-frequency. Practical value. Simulation studies in the MATLAB / Simulink environment are performed to analyze system performance and assess its robustness and stability. Thus, our converter is more efficient and able to cope with parametric variation.

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The Design of High Frequency LLC Switching Power Supply Based on GaN Device

Wu¹,

Huang²,

Wang³

2022

Lecture Notes in Electrical Engineering

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A time-domain stability analysis method for paralleled LLC resonant converter system based on Floquet theory

Cited by 5 publications

References 1 publication

Robust Adaptive Feedforward Sliding Mode Current Controller for Fast-Scale Dynamics of Switching Multicellular Power Converter

Robust Adaptive Feedforward Sliding Mode Current Controller for Fast-Scale Dynamics of Switching Multicellular Power Converter

On modeling and real-time simulation of a robust adaptive controller applied to a multicellular power converter

The Design of High Frequency LLC Switching Power Supply Based on GaN Device

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