Research on Overvoltage for XLPE Cable in a Modular Multilevel Converter HVDC Transmission System

Wang, Maggie Haitian; Cao, Junzheng; He, Zhiyuan; Yang, Jie; Han, Zhengyi; Chen, George

doi:10.1109/tpwrd.2015.2469595

Cited by 37 publications

(27 citation statements)

References 12 publications

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“…As the valve-side SPG faults are normally permanent, the remote converter should be shut down immediately after the fault. The remote converter will be blocked based on either its local DC protection or a blocking signal received from the faulted converter through communications [17]. Then, the remote converter can switch to a static synchronous compensator (STATCOM) mode when the SPG fault is fully isolated.…”

Section: Double-thyristor Based Protection Strategymentioning

confidence: 99%

Double-Thyristor-Based Protection for Valve-Side Single-Phase-to-Ground Faults in HB-MMC-Based Bipolar HVDC Systems

Liu

Joseph

et al. 2020

IEEE Trans. Ind. Electron.

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The valve-side single-phase-to-ground (SPG) faults in half-bridge modular multilevel converter (HB-MMC) based bipolar high-voltage direct-current (HVDC) systems induce some special fault consequences: overvoltage on the submodule (SM) capacitors in converter upper arms and non-zero-crossing currents in the grid-side ac circuit breaker (ACCB). In this letter, a protection strategy based on converter embedded double-thyristors is proposed to address these issues. The double-thyristors are installed in parallel with each SM in the lower arms of the converter. By triggering the double-thyristors, the SPG fault is converted into a three-phase short-circuit which ensures current zerocrossings in the grid-side ACCB. Moreover, as the voltages of converter AC buses are clamped by the ground through the triggered double-thyristors, the upper arm overvoltage is mitigated. The effectiveness of the proposed protection strategy has been verified in a bipolar HB-MMC HVDC link built in PSCAD/EMTDC.

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Section: Double-thyristor Based Protection Strategymentioning

confidence: 99%

Double-Thyristor-Based Protection for Valve-Side Single-Phase-to-Ground Faults in HB-MMC-Based Bipolar HVDC Systems

Liu

Joseph

et al. 2020

IEEE Trans. Ind. Electron.

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“…Let us assume that the SPG fault occurs at a power-receiving converter and that the power transmitted from the powersending converter (i.e. the remote converter) is P. If the powersending converter takes Δt to block the IGBTs based on either its local protection or a blocking signal received from the faulted converter through communications [31], the voltage change ΔVdc of the upper arm SM capacitors in the faulted converter can be obtained using the following equation:…”

Section: B Impact Of the Remote Converter On The Faulted Convertermentioning

confidence: 99%

Protection for Submodule Overvoltage Caused by Converter Valve-Side Single-Phase-to-Ground Faults in FB-MMC Based Bipolar HVDC Systems

Liang

Ugalde‐Loo

et al. 2020

IEEE Trans. Power Delivery

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One of the most critical faults affecting modular multilevel converter (MMC) based bipolar high-voltage directcurrent (HVDC) transmission systems is the single-phase-toground (SPG) faults between the converter transformer and the valve. However, half-bridge (HB) and full-bridge (FB) based MMCs exhibit a different behavior following such a fault and, thus, converter protection should be addressed in a different manner for each configuration. For HB-MMCs, an SPG fault at the valve-side leads to a severe overvoltage on the submodule (SM) capacitors in the converter upper arms and to grid-side non-zero crossing currents. Although FB-MMCs only exhibit overvoltage, these are more severe than for their HB counterparts. To address this problem, this paper presents a protection strategy considering thyristor bypass branches placed in parallel with upper arms of FB-MMCs. By employing this configuration, the upper arm overvoltage in the faulted converter is mitigated and remote converters can be quickly blocked using their local protection schemes. For completeness, the effectiveness of the strategy is verified through time-domain simulations in PSCAD/ EMTDC. The studies in this paper demonstrate the effectiveness of the presented protection scheme for station internal faults occurring in FB-MMCs in bipolar HVDC systems.

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“…Wang et al investigate the switching impulse over‐voltage stresses produced by faulty conditions for the DC cable system with the aid of MMC. Analysis and developments for the study are tested on BTB MMC‐based HVDC system.…”

Section: Application Areasmentioning

confidence: 99%

Recent contributions and future prospects of the modular multilevel converters: A comprehensive review

Kurtoğlu

Eroğlu

Arslan

et al. 2018

Int Trans Electr Energ Syst

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Summary The modular multilevel converters (MMCs) are frequently preferred for medium and high power energy conversion systems thanks to their modular structure and high quality output waveform. The remarkable studies related to the MMC have been carried out in recent years, which are mainly focused on its topology, control, or application. In this paper, MMC circuit topologies consisting of traditional submodule cells and new proposed configurations are introduced, and their control process, modulation techniques, and application areas are discussed in order to provide the readers the current state of the art of MMC technology. A wide part of this article is devoted to demonstrate the recent contributions arising in MMC studies. In this context, this paper not only outlines the circuit topology, control objectives, and applications of the MMC but also presents a comprehensive review, principally in terms of the latest developments of it. Ultimately, detailed proposals and new possible topics are provided to drive future expectations of MMC technology.

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Research on Overvoltage for XLPE Cable in a Modular Multilevel Converter HVDC Transmission System

Cited by 37 publications

References 12 publications

Double-Thyristor-Based Protection for Valve-Side Single-Phase-to-Ground Faults in HB-MMC-Based Bipolar HVDC Systems

Double-Thyristor-Based Protection for Valve-Side Single-Phase-to-Ground Faults in HB-MMC-Based Bipolar HVDC Systems

Protection for Submodule Overvoltage Caused by Converter Valve-Side Single-Phase-to-Ground Faults in FB-MMC Based Bipolar HVDC Systems

Recent contributions and future prospects of the modular multilevel converters: A comprehensive review

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