Double Wye Modular Multilevel Converter - Direct DC-DC Topology

Klimczak, Pawel; Błaszczyk, Paweł; Jez, Radoslaw; Koska, Krzysztof

doi:10.1049/cp.2016.0185

Cited by 17 publications

(5 citation statements)

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“…By substituting ( 16) and ( 19) in ( 30), the change in the inductor current for each SM in the 1 st arm is given by (31). Assuming unity power factor, the output voltage from CS-MMC can be expressed by (32), where 1 is DC voltage of the CS-MMC at rated power, then by substituting ( 29) and ( 32) in (31), the inductor ripple current can be expressed by (33) and (34).…”

Section: ) Inductance Design Of the Cs-mmcmentioning

confidence: 99%

“…Moreover, a two stage modular multilevel DC-DC converter was proposed in [30], which consists of a halfbridge MMC followed by an H-bridge MMC, where the first stage produces an AC square wave while the second stage rectifies the AC square wave into the required DC output voltage, but it has DC link capacitors which limits the converter to medium power applications. Also, a transformer-less DC MMC based converter has been introduced in [31]. It uses branches and arms of submodules (SMs) to provide power transfer between primary and secondary sides.…”

Section: Introductionmentioning

confidence: 99%

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A New Hybrid Dual Active Bridge Modular Multilevel Based DC–DC Converter for HVDC Networks

et al. 2021

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Multi-terminal high voltage DC transmission currently represents a leading technology in longdistance power transmission systems. Among the main technical challenges facing such technology, DC fault isolation, permitting different grounding schemes, providing interoperability, and high DC voltage stepping between different HVDC networks, and allowing high-speed power reversal without power interruption especially when connecting the pre-existing voltage source converters (VSC) and line commutated converters (LCC)-based HVDC networks. This paper introduces a new modular multilevel converter (MMC) based front-to-front DC-DC converter to interconnect two different types (LCC/VSC) of HVDC networks. The proposed topology comprises a voltage source MMC (VS-MMC) and a current source MMC (CS-MMC), while both are coupled via an AC link including the isolating transformer. The proposed topology can successfully provide an uninterruptible bi-directional power flow, high DC voltage stepping with a DC fault blocking capability, and low number of semiconductors due to the usage of only half-bridge SMs. The system design is provided with a detailed mathematical analysis. Furthermore, two active power control methodologies are proposed and compared. The first control technique is simpler and entails lower passive elements, while the second technique ensures a zero reactive power over the full range of active power flow. Furthermore, Losses analysis and comparison are provided between the two proposed control techniques. Finally, Control-Hardware-in-the-Loop (CHiL) test validation is employed to confirm the validity of the proposed system under healthy as well as different fault scenarios.INDEX TERMS Modular multilevel converter, DC-DC power converters, HVDC, Power control, Bidirectional power flow, Control-Hardware-in-the-Loop (CHiL).

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Section: ) Inductance Design Of the Cs-mmcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Hybrid Dual Active Bridge Modular Multilevel Based DC–DC Converter for HVDC Networks

et al. 2021

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“…The focus on this paper will be mainly on the isolated DC-DC converter topologies with different voltage levels and isolation systems which may be required to split the bulky system into several sub systems to prevent blackout in case of system failure. However, in cases of similar HVDC systems with the same dc voltage level a non isolated DC-DC converter topologies can be used [9]- [12].…”

Section: Introductionmentioning

confidence: 99%

Trapezoidal operation of modular multilevel DC-DC converter for HVDC interconnections

Saleh

Merlet

Costabeber

et al. 2021

IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society

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High Voltage Direct Current (HVDC) grids are becoming a preferred option for the expansion of the traditional electrical networks as a result of their potential economic, technical and environmental benefits. Developing HVDC grids includes the linking of existing HVDC buses which may be implemented with different voltage levels, different HVDC technology and various grounding schemes. Interconnecting these HVDC systems will require DC-DC converters to provide voltage matching, isolation and a means for splitting the HVDC grid into sub systems. This paper presents a modified trapezoidal operation of MMC-DC-DC converter, MTrMMC-DC-DC, with high semiconductor device utilization and lower device current rating in addition to an increase of converter's energy density. Better utilization of the semiconductor devices results from conducting the current through the arms of the TrMMC-DC-DC converter continuously. The reduction of the energy storage requirements is achieved through careful design of the submodule (SM) capacitors and arm inductors to achieve resonance between the effective equivalent capacitor of each arm and the arm inductor at a frequency below twice the fundamental operating frequency. The circuit parameter design is validated for an 800MW, 400kV HVDCbased system through PLECS simulations.

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“…The so-called triangular MMC, a non-isolated DC-DC converter utilizing MMC submodules, is presented in [15]. Yet another direct DC-DC converter is discussed in [16] and [17], with double wye or T connected branches enabling conversion without the intermediate stage. Figure 1 presents the overview of selected MMC topologies cited in the introduction.…”

Section: Introductionmentioning

confidence: 99%

Energy balancing in modular multilevel converter systems

Błaszczyk

Koska

Klimczak

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The modular multilevel converter (MMC) is a well-known solution for medium and high voltage high power converter systems. This paper deals with energy balancing of MMCs. The analysis includes multi-converter systems. In order to provide clear view, the MMC control system is divided into hierarchical levels. Details of control and balancing methods are discussed for each level separately. Finally, experimental results, based on multi-converter test setup, are presented.

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Double Wye Modular Multilevel Converter - Direct DC-DC Topology

Cited by 17 publications

References 0 publications

A New Hybrid Dual Active Bridge Modular Multilevel Based DC–DC Converter for HVDC Networks

A New Hybrid Dual Active Bridge Modular Multilevel Based DC–DC Converter for HVDC Networks

Trapezoidal operation of modular multilevel DC-DC converter for HVDC interconnections

Energy balancing in modular multilevel converter systems

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