Analysis and Control of a Hybrid-clamped Four-level π-type Converter

Jin, Bosen; Yuan, Xibo

doi:10.1109/icems.2019.8921852

Cited by 3 publications

(6 citation statements)

References 24 publications

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“…Fig. 5 shows another derived four-level topology, which was first proposed in [9] by the author. However, it was not straightforward to invent this topology.…”

Section: The Proposed Generalized Topology and Derived Topology Examplesmentioning

confidence: 99%

“…Now, it can be easily derived from the proposed generalised topology by having two bi-directional switches. The dc-link neutral point voltages and the flying capacitor voltages can be well regulated using the Type I modulation and control method [9]. If the flying capacitor C1 in Fig.…”

Section: The Proposed Generalized Topology and Derived Topology Examplesmentioning

confidence: 99%

“…If the dc-link capacitor voltages cannot be balanced using Type I or Type II methods, then the Type III method should be used, which provides more controllability at the cost of more switching actions/losses and harmonics. The demonstration of using the Type I method can be found in reference [9] as an example. The demonstration of using the Type II method can be found in reference [11].…”

Section: The Proposed Generalized Topology and Derived Topology Examplesmentioning

confidence: 99%

“…In the author's own paper [1], several generalised topologies and methods to derive existing and new topologies have been presented. However, an ultimate generalised topology which can unify the existing topologies has not been identified, especially regarding how to incorporate bi-directional switches (e.g., using back-to-back IGBTs or MOSFETs) into the generalised topology, from which many existing and new topologies can be obtained, such as the three-level T-type converter, the four-level π-type converter [7] and other hybrid topologies [1,[8][9][10]. Some topologies with bi-directional switches are particularly difficult to understand and appreciate how they can be obtained.…”

Section: Introductionmentioning

confidence: 99%

“…These redundant switching states can be used for controlling the dc-link capacitor voltages and flying capacitor voltages. An example is given in reference [9]. The second type of methods is the conventional space vector modulation which normally uses the nearest three vectors (NTV) or carrier-based modulation using zero-sequence voltage injection from a three-phase point of view (Type II).…”

Section: Introductionmentioning

confidence: 99%

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Ultimate Generalized Multilevel Converter Topology

Yuan

2021

IEEE Trans. Power Electron.

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There are various ways to derive multilevel converter topologies as pointed out by the author's previous work. This letter proposes a voltage-source generalized multilevel converter topology which unifies several generalized multilevel topologies and also incorporates bi-directional switches. Most of the known multilevel topologies can be derived from this topology and new topologies can also be derived from it. Examples have been given in this letter. This generalized topology helps to understand complicated converter topologies, especially those with bidirectional switches and it can also be used to determine the voltage requirements/ratings of the devices in various topologies. This letter has summarized the rules to derive topologies from this generalized topology and provides experimental results for one of the derived multilevel converter examples. It is expected new topologies can be inspired or derived from this work and used for existing and emerging applications, with this letter as a milestone in the research of multilevel converter topologies.

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“…Fig. 5 shows another derived four-level topology, which was first proposed in [9] by the author. However, it was not straightforward to invent this topology.…”

Section: The Proposed Generalized Topology and Derived Topology Examplesmentioning

confidence: 99%

Section: The Proposed Generalized Topology and Derived Topology Examplesmentioning

confidence: 99%

Section: The Proposed Generalized Topology and Derived Topology Examplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ultimate Generalized Multilevel Converter Topology

Yuan

2021

IEEE Trans. Power Electron.

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Four-Level Three-Phase Inverter With Reduced Component Count for Low and Medium Voltage Applications

2021

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This paper proposes a novel three-phase topology with a reduced component count for lowand medium-voltage systems. It requires three bidirectional switches and twelve unidirectional switches for producing four-level voltages without using flying capacitors or clamping diodes, reducing the size, cost, and losses. Removing flying capacitors and clamping diodes allows it to simplify control algorithms and increase the reliability, efficiency, and lifetime. A modified low-frequency modulation (LFM) scheme is developed and implemented on the proposed topology to produce a staircase voltage with four steps. Further, a level-shifted pulse width modulation (LSPWM) is used to reduce the filter size and increase the output voltage controllability. In this study, a voltage balancing control algorithm is executed to balance the DC-link capacitor voltages. The performance of the proposed topology is numerically demonstrated and experimentally validated on an in-house test setup. Within the framework, the power loss distribution in switches and conversion efficiency of the proposed circuit are studied, and its main features are highlighted through a comparative study.INDEX TERMS DC-AC converters, four-level inverters, low and medium voltage applications, multilevel inverters, three-phase inverters.

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