CHB Converter DC Voltage Control Based on Feedback Linearization

Pugliese, Sante; Mastromauro, Rosa A.; Stasi, S.; Liserre, Marco

doi:10.1109/iecon.2018.8591549

Cited by 1 publication

(4 citation statements)

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“…It operates the voltage balance in the CHB converter, which starts as first, followed by the DAB converters. Using this procedure, overvoltage and capacitors or IGBTs failures can occur since the CHB control performance depends on the initial conditions of each cell, as discussed in [25][26]. In particular, due to the mismatch of the MV resistance and capacitance parameters, the steady-state voltages reached by each DC-link of the CHB in grid-connected passive rectifier operation, are quite different among them.…”

Section: A Balancing Of the Dc-link Voltages In The MV Sidementioning

confidence: 99%

“…Hence, the initial state in each DC-link is different from the others and the voltage balancing cannot be achieved before the CHB converter starts. In such nonlinear systems, the behavior of the controlled variables during the start-up, depends on its own values in the initial condition [25][26]. Usually the control design workflow for the CHB converter is realized considering a linearized model of the control in the steady-state conditions but, in case of a wide voltage range of operation, such a linearized model does not represent the real dynamics anymore, as it happens during the soft-start.…”

Section: A Balancing Of the Dc-link Voltages In The MV Sidementioning

confidence: 99%

“…where rd (s -1 ) and ro (V/s) are the slope-rate of the duty-cycle D and of the output voltage Vo, respectively. By substituting (25) in (24), the resulting function, which represents the time evolution of the HFT current peak during the soft-charging process, can be expressed by: (27) where (26) represents the equation of a parabola, while IDAB,pk is the maximum value assumed by the peak current during the soft-charging process. More generically, (26) can be written as…”

Section: B2 Design Of the Ramp Slope-rate For The Dab Soft-startmentioning

confidence: 99%

“…HFT DAB current compared to the current estimated by(26) or (28) at several duty-cycle slope-rate, VDC,i = 250V, at light-load operation.…”

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confidence: 99%

See 3 more Smart Citations

Soft-Start Procedure for a Three-Stage Smart Transformer Based on Dual-Active Bridge and Cascaded H-Bridge Converters

Pugliese

Buticchi

Mastromauro

et al. 2020

IEEE Trans. Power Electron.

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Power electronics-based three-stage smart transformers (ST) can be seriously damaged by inrush currents and overvoltages during the start-up phase if the control of the stages is not correctly coordinated. Hence, it is crucial to design properly the start-up procedure, especially in case of modular architectures with distributed DC-links. The design of the start-up procedure depends on the ST power stages topologies, their control systems and the operation modes. This work proposes a soft-shift start modulation technique that allows to limit the inrush current in the DC/DC isolation stage during the DC-link capacitors pre-charging. A fast voltage balancing control, performed by the DC/DC isolation stage, is introduced to avoid overvoltages and unbalanced voltage conditions among the different power cells. Under the proposed method, fast control dynamics is guaranteed thanks to the high frequency bandwidth of the DC/DC isolation stage converters. Theoretical analysis, based on a detailed small signal model of the ST, and simulations are used to demonstrate the principle of the operation. Experimental results, carried out in a ST prototype, confirm the performances of proposed solution in realizing a smooth start-up without voltage/current overshoots.

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Section: A Balancing Of the Dc-link Voltages In The MV Sidementioning

confidence: 99%

Section: A Balancing Of the Dc-link Voltages In The MV Sidementioning

confidence: 99%