Triangular Current Mode for High Step Ratio Modular Multilevel DC-DC Converter

Pineda, Cristian; Pereda, Javier; Zhang, X.; Rojas, Félix

doi:10.1109/ecce.2018.8558369

Cited by 7 publications

(7 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the optimization problem is set to minimise the square of the rms inductor current per-unit i rms L,pu , due to the conduction losses of the passive elements and devices are proportional to the square of this rms current. The derivation of this rms inductor current per-unit as function of (Φ 1 , Φ 2 , D 1 , D 3 , r V ) yields to (13), considering the current base as I base = V HV •r S 12fsL .…”

Section: Optimizationmentioning

confidence: 99%

See 1 more Smart Citation

Zero-Current Switching (ZCS) for a High Step Ratio Modular Multilevel dc-dc Converter with wide voltage range operation

Pineda

Pereda

Burgos-Mellado

et al. 2020

2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)

View full text Add to dashboard Cite

The rise of new dc technologies is pushing the development of highly efficient dc-dc converters, especially at high voltage and high step ratio. Modular multilevel converters (MMCs) are an attractive alternative because they can manage medium and high dc voltages with standard semiconductor devices with high efficiency if they employ soft-switching techniques. However, the latest soft-switching techniques have been proposed for fixed voltage range, limiting their operation. This paper proposes a soft-switching modulation for the high step ratio Modular Multilevel dc-dc Converter in extended voltage range. The proposal achieves zero-current switching and regulates the voltage balance among the floating cell capacitors, while using a simple control scheme to regulate the output voltage. The theoretical analysis has been verified with full-scale simulations, demonstrating excellent dynamic response and reduced rms current.Index Terms-dc-dc conversion, modular multilevel converter, high step ratio conversion, triangular current mode, trapezoidal current mode.

show abstract

Section: Optimizationmentioning

confidence: 99%

“…At this limit case (Fig. 5 (b)) the current starts to be triangular, enabling the asymmetric triangular current mode (ATCM) with r V < 1 for power references lower than the inferior limit [13]. Thus, ATMC is able to modulate through the duty cycle beyond this limit if the time-window restriction (15) is released.…”

Section: Optimizationmentioning

confidence: 99%

Zero-Current Switching (ZCS) for a High Step Ratio Modular Multilevel dc-dc Converter with wide voltage range operation

Pineda

Pereda

Burgos-Mellado

et al. 2020

2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)

View full text Add to dashboard Cite

show abstract

“…By connecting two MMCs via a medium-frequency transformer, the hard switching topology generates multilevel ac voltages, however, it requires SM capacitor voltages balancing control, and the efficiency reduced by the hard-switching operation [5]- [11]. Soft switching topologies based on resonant tanks (R-MMC) [12]- [14] or triangular currents mode [15] have been proposed to solve this two problems, resulting in natural capacitor voltage balancing and soft switching. Despite its soft-switching operation, the resonant modular multilevel converter (R-MMC) it creates large peak currents and limits voltage regulation, resulting in high conduction losses that leads to reduce the efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Trapezoidal current mode (TCM) used to DC-DC converters like dual active bridge (DAB), provides bidirectional power flow control with high efficiency while retaining zero current switching (ZCS) operation without applying resonance [17], [18]. As a result, trapezoidal current mode (TCM) considered the preferable solution for MDCCs, recently a triangular current mode was proposed to be used [15], which is a subset of TCM that achieves optimized soft switching. This paper discusses trapezoidal current mode TCM for high step ratio MDCC that minimizes peak current through the ac interconnection over triangular operation and provides bidirectional power flow using an easy control method, SM capacitor voltages balancing and ZCS operation [15], and the results ISSN: 2710-2165 http://doi.org/10.33193/IJSER.1.1.2022.38 https://ijser.aliraqia.edu.iq of TCM method are compared with results obtained from S2L modulation.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Trapezoidal Current and Stepped 2-Level Modulation Techniques in Modular DC-DC Converter

2022

IJSER

View full text Add to dashboard Cite

For high step-ratio connectivity in direct current (DC) grid applications, a modular (DC-DC) converter (MDCC) has been proposed. To improve the performance of the MDCC, this paper discusses a trapezoidal current modulation (TCM). Com-paring with stepped 2level modulation where the sub-module (SM) capacitor voltages are balanced with a feedback control loop, TCM ensures the voltage balancing by applying an equal duty cycle for each SM in the high voltage stack with-out any additional feedback control. Three-level operation mode featured with large power transmission and high efficiency conversion, based on circulating current analysis and softswitching performance is introduced. The control schemes of this operation mode is designed to minimize both the SM capacitor voltage ripples and the peak current. An analytical simulation of the MDCC is presented using MATLAB/SIMULINK to explain the operation and discuss the results.

show abstract

“…This paper presents a new asymmetrical triangular current mode (ATCM) for high step ratio dc-dc MMC, which achieves bidirectional power flow through a simple control law, maintains ZCS operation, reduces the peak current compared to resonant mode, and presents natural balance of the voltage in the cell capacitors without the need of complex control strategies [29]. The high step ratio dc-dc MMC topology is presented in Section II, the proposed modulation of the converter is described in Section III and the dynamic balance of power is analysed in Section IV.…”

Section: Introductionmentioning

confidence: 99%

Asymmetrical Triangular Current Mode (ATCM) for Bidirectional High Step Ratio Modular Multilevel Dc–Dc Converter

Pineda

Pereda

Rojas

et al. 2020

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

DC networks have proven advantages in high voltage (HVDC) transmission systems, and now they are expanding to medium and low voltage distribution networks. One of the major challenges is to develop reliable dc-dc voltage transformation achieving high efficiency and performance, especially at high voltage and high step ratio. New resonant modular multilevel topologies have arisen as an alternative, mainly because of advantages such as optional use of transformers, natural voltage balance, simple control and soft-switching capability. However, this type of operation generates a high peak current, does not allow control of power flow in all power range and has a limited range of voltage variation. This paper proposes an asymmetrical triangular current mode (ATCM) applied to high step ratio Modular Multilevel dc-dc Converters. The proposed modulation increases the efficiency and achieves bidirectional control of the power, soft-switching and a natural balance of the voltage in the cell capacitors. The experimental results show the bidirectional operation and the capacitor voltage balance of the converter under different operating conditions with higher efficiency (97.72%) and lower peak current compared to previous reports of this topology using resonant operation. Index Terms-dc-dc conversion, modular multilevel converter, high step ratio conversion, triangular current mode.

show abstract

Triangular Current Mode for High Step Ratio Modular Multilevel DC-DC Converter

Cited by 7 publications

References 10 publications

Zero-Current Switching (ZCS) for a High Step Ratio Modular Multilevel dc-dc Converter with wide voltage range operation

Zero-Current Switching (ZCS) for a High Step Ratio Modular Multilevel dc-dc Converter with wide voltage range operation

Comparison of the Trapezoidal Current and Stepped 2-Level Modulation Techniques in Modular DC-DC Converter

Asymmetrical Triangular Current Mode (ATCM) for Bidirectional High Step Ratio Modular Multilevel Dc–Dc Converter

Contact Info

Product

Resources

About