Review of Hybrid Multilevel Converter Topologies Utilizing Thyristors for HVDC Applications

Bakas, Panagiotis; Okazaki, Yuji; Shukla, Anshuman; Patro, Siba Kumar; Ilves, Kalle; Dijkhuizen, Frans; Nami, Alireza

doi:10.1109/tpel.2020.2997961

Cited by 65 publications

(21 citation statements)

References 44 publications

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“…Gate control signals are used to guide their operating mode (ie rectifier/inverter) based on the thyristor firing angles (ideally: 0 • to 90 • for rectifier mode and 90 • to 180 • for inverter mode) as well as for power quality adjustment. LCCs are classified as current source converters (CSC) because they allow DC current to passes in one direction [7]. The operation of LCC-HVDC in weak AC networks requires special measures to reduce the risk of drain failure.…”

Section: Literature Surveymentioning

confidence: 99%

Multifunctional scheme for frequency/voltage/stability control in HVDC line under concurrent cyber‐attacks and faults

Hemmati

Faraji

2021

IET Generation Trans & Dist

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This paper presents a control mechanism on high voltage direct current (HVDC) transmission line for frequency/voltage regulation, fault ride through (FRT) capability, and cyber‐attack/fault detection. The network under study consists of two areas with different frequencies that are connected through one 300 km HVDC line. The proposed control system regulates the frequency in both areas by managing power through HVDC line. The converters on both sides of HVDC line are controlled to handle faults on the DC and AC sections as well as improving fault ride through capability. The control strategies are implemented and operated depending on fault/cyber‐attack type and behaviour. In this respect, the control mechanism may change the firing angle of converters, switch their operating mode from rectifier to converter and vice‐versa or even block the converters. The proposed paradigm successfully distinguishes between the cyber‐attacks and faults. The simulations in MATLAB software validate that the proposed mechanism realizes all the objectives and the cyber‐attacks are completely identified and separated from the faults.

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Section: Literature Surveymentioning

confidence: 99%

Multifunctional scheme for frequency/voltage/stability control in HVDC line under concurrent cyber‐attacks and faults

Hemmati

Faraji

2021

IET Generation Trans & Dist

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“…MMC has been recognised as invincible topology for high-power and medium/high-voltage applications [30]. e modularity and scalability features of MMC make it an attractive topology for HVDC applications.…”

Section: Introductionmentioning

confidence: 99%

A Detailed Review of MMC Circuit Topologies and Modelling Issues

Soomro

Akhtar

Hussain

et al. 2022

International Transactions on Electrical Energy Systems

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MMC is a promising technology for MTDC systems and would transform into the concept of Supergrids in the near future. The salient features of MMC are modularity, reduced dv/dt and di/dt stress on switches, voltage and power scalability, inherent fault blocking capacity, transformerless operation, and improved power quality. However, there are some technical issues and challenges to be critically analysed and addressed. There is room for development of novel and enhanced MMC based on SM configurations to enable higher efficiency, improved power quality, compactness, and DC fault blocking capacity. Moreover, development of efficient and accurate models is required for the studies of MTDC grids during steady-state and transient conditions. Literature review suggests a need for studying and comparing different MMC modelling approaches because no modelling technique can be best suited for all applications. The main contribution of this paper is to provide a comprehensive review of recent developments in MMC in terms of SM configurations. This paper also presents an in-depth review of systematic comparison of different models of MMC, which can enable appropriate selection of model based on target studies and desired accuracy and efficiency. Finally, the associated research challenges and future trends are presented.

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“…In line with new technologies for future power grids and with the developments in power electronics, traditional substations are also changing, mainly in line with future DC grids. In [36], a review of multilevel converters with thyristors for HVDC applications is presented, and in [37], future electrical substations are presented considering the integration of HVDC grids, operating as a transmission layer of future hybrid AC/DC grids, showing the decisive role of the various technologies and topologies of power electronics converters. On the other hand, [38] presents the various possible configurations and a comparative evaluation for DC substations, while hierarchical control strategies are presented in [39].…”

Section: Introductionmentioning

confidence: 99%

Review of a Disruptive Vision of Future Power Grids: A New Path Based on Hybrid AC/DC Grids and Solid-State Transformers

et al. 2021

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Power grids are evolving with the aim to guarantee sustainability and higher levels of power quality for universal access to electricity. More specifically, over the last two decades, power grids have been targeted for significant changes, including migration from centralized to decentralized paradigms as a corollary of intensive integration of novel electrical technologies and the availability of derived equipment. This paper addresses a review of a disruptive vision of future power grids, mainly focusing on the use of hybrid AC/DC grids and solid‑state transformers technologies. Regarding hybrid AC/DC grids in particular, they are analyzed in detail in the context of unipolar and bipolar DC grids (i.e., two‑wire or three‑wire DC grids), as well as the different structures concerning coupled and decoupled AC configurations with low‑frequency or high‑frequency isolation. The contextualization of the possible configurations of solid‑state transformers and the different configurations of hybrid transformers (in the perspective of offering benefits for increasing power quality in terms of currents or voltages) is also analyzed within the perspective of the smart transformers. Additionally, the paper also presents unified multi‑port systems used to interface various technologies with hybrid AC/DC grids, which are also foreseen to play an important role in future power grids (e.g., the unified interface of renewable energy sources and energy storage systems), including an analysis concerning unified multi‑port systems for AC or DC grids. Throughout the paper, these topics are presented and discussed in the context of future power grids. An exhaustive description of these technologies is made, covering the most relevant and recent structures and features that can be developed, as well as the challenges for the future power grids. Several scenarios are presented, encompassing the mentioned technologies, and unveiling a progressive evolution that culminates in the cooperative scope of such technologies for a disruptive vision of future power grids.

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Review of Hybrid Multilevel Converter Topologies Utilizing Thyristors for HVDC Applications

Cited by 65 publications

References 44 publications

Multifunctional scheme for frequency/voltage/stability control in HVDC line under concurrent cyber‐attacks and faults

Multifunctional scheme for frequency/voltage/stability control in HVDC line under concurrent cyber‐attacks and faults

A Detailed Review of MMC Circuit Topologies and Modelling Issues

Review of a Disruptive Vision of Future Power Grids: A New Path Based on Hybrid AC/DC Grids and Solid-State Transformers

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