Modular DC/DC converter: Comparison of modulation methods

Kenzelmann, Stephan; Dujić, Dražen; Canales, Francisco; Novaes, Yales Rômulo de; Rufer, A.

doi:10.1109/epepemc.2012.6397405

Cited by 33 publications

(31 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The net ac energy and dc energy deviation are zero over each effective cycle without extra balancing control. Moreover, the maximum energy deviation of this converter is around 1.5 kJ/MVA, which is much smaller than other MMC dc-dc converters with the same switching frequency range (300-500 Hz) [21], [22], [24]. This implies that the more compact and lower cost SM design could be achieved in this isolated RMMC.…”

Section: B Sm Capacitor Sizingmentioning

confidence: 87%

“…The front-to-front configuration of MMC is one of the most promising choices to interconnect two different HVDC links because of the good modularity, symmetry and flexibility [21]- [23]. Different modulation methods were presented to improve power density and efficiency [24]- [26]. However, it is not a low-cost option for MVDC applications since the power devices utilization is usually lower than competing approaches [14], [27], and the complicated rotation algorithm and hard switching operation may further undermine its advantages for MVDC conversion.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Isolated Resonant Mode Modular Converter With Flexible Modulation and Variety of Configurations for MVDC Application

Xiang

Zhang

Chaffey

et al. 2018

IEEE Trans. Power Delivery

View full text Add to dashboard Cite

The dc tap or dc transformer will play an important role in interfacing different voltages of dc links in dc grids. This paper presents an isolated resonant mode modular converter (RMMC) with flexible modulation and assorted configurations to satisfy a wide variety of interface requirements for medium voltage dc (MVDC) networks. The transformer-less RMMC, as introduced in the literature, implemented a restricted modulation scheme leading to a very limited range of step-ratio and the diode rectifier resulted in unidirectional power flow. Both of these limitations are removed in this proposal and galvanic isolation has also been added. Moreover, this new RMMC approach can serve as a building block for variety of configurations. Two such derived topologies are given, which inherently balance the voltage and current between different constituent circuits and realize the high power rating conversion for very low or very high step-ratio application. The theoretical analysis is validated by a set of full-scale simulations and a down-scaled experimental prototype. The results illustrate that this isolated RMMC and its derivatives have promising features for dc taps or dc transformers in MVDC applications.

show abstract

Section: B Sm Capacitor Sizingmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

An Isolated Resonant Mode Modular Converter With Flexible Modulation and Variety of Configurations for MVDC Application

Xiang

Zhang

Chaffey

et al. 2018

IEEE Trans. Power Delivery

View full text Add to dashboard Cite

show abstract

“…However, there has been great incentive for the development of multiterminal DC (MTDC) transmission and DC power networks [1,2] . The development of DC networks will require significant further advances in two key high-power components: DC breakers (CB) and DC transformers [3] . A DC CB enables isolation of a faulted line or a unit, and DC transformer is needed to transform DC voltage levels between distributed loads and generators.…”

Section: Introductionmentioning

confidence: 99%

Prototype design and experimental verification of an isolated modular dc/dc converter system

Zhang

Wang

et al. 2016

12th IET International Conference on AC and DC Power Transmission (ACDC 2016)

View full text Add to dashboard Cite

This paper details design, development and control methods of an isolated modular DC/DC converter (IMDCC) system. A 10kW downscaled prototype is constructed to show the working principles, hardware design procedures, and control circuits implementation. In this prototype, there are two MMC stations, namely the inverter end and the rectifier end, each consisting of N half-bridge (HB) sub-modules (SMs). Each phase is controlled by an independent phase controller while both stations are controlled by a central controller. Moreover, the management and communication methods of these SMs are also illustrated. Further, the control principles for the single-phase and three-phase IMDCC system are presented respectively to achieve power regulation and balance all the SM capacitor voltages. Finally, experimental results are given to verify the validity of the circuit design and show the effectiveness of the control methods for both singlephase and three-phase IMDCC.

show abstract

“…However, their use in DC/DC converters has only been a subject of recent researches. In [9][10][11] MMCs are connected front-to-front via an isolating transformer to obtain voltage stepping and galvanic isolation. However, in contrast to LCL DC/DC converter, fundamental frequency is limited to a few hundred hertz to limit transformer magnetic losses.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of 30kW 200/900V LCL modular multilevel based DC/DC converter for high power applications

Fazeli

Aboushady

Ahmed

et al. 2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

View full text Add to dashboard Cite

This paper presents the design, development and testing of a 30kW, 200V/900V modular multilevel converter (MMC) based DC/DC converter prototype. An internal LCL circuit is used to provide voltage stepping and fault tolerance property. The converter comprises two five level MMC based on insulated gate bipolar transistors (IGBTs) and metal oxide semiconductor field effect transistor (MOSFET). Due to low number of levels, selective harmonic elimination modulation (SHE) is used, which determines the switching angles in such a way that third harmonic is minimized whereas the fundamental component is a linear function of the modulation index. In addition, instead of using an expensive control board, three commercial control boards are embedded. This is required to implement the sophisticated DC/DC converter control algorithm. Simulation and experimental results are presented to demonstrate the converter performance in step up and down modes.

show abstract

Modular DC/DC converter: Comparison of modulation methods

Cited by 33 publications

References 19 publications

An Isolated Resonant Mode Modular Converter With Flexible Modulation and Variety of Configurations for MVDC Application

An Isolated Resonant Mode Modular Converter With Flexible Modulation and Variety of Configurations for MVDC Application

Prototype design and experimental verification of an isolated modular dc/dc converter system

Design and implementation of 30kW 200/900V LCL modular multilevel based DC/DC converter for high power applications

Contact Info

Product

Resources

About