DC Fault Detection and Location in Meshed Multiterminal HVDC Systems Based on DC Reactor Voltage Change Rate

Li, Rui; Xu, Lie; Yao, Liangzhong

doi:10.1109/tpwrd.2016.2590501

Cited by 307 publications

(185 citation statements)

References 36 publications

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“…fault current can be selected as the protection criterion. In order to reduce the calculation work, the current change rate can be represented by the current limiting reactor voltage VL [30]. The fault location criterion and calculation formula is:…”

Section: Fault Location Discriminationmentioning

confidence: 99%

Pole-to-Ground Fault Analysis and Fast Protection Scheme for HVDC Based on Overhead Transmission Lines

Xue

Lian

et al. 2017

Energies

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Flexible direct current (DC) transmission network technology is an effective method for large capacity clean energy access to power grids, but the DC short-circuit fault detection for it is a difficult problem. In this paper, the pole-to-ground fault transient characteristics in a multi-terminal DC power grid, based on overhead transmission lines and DC circuit breakers, are analyzed firstly. Then, a fast protection scheme is proposed according to the fault transient characteristics. Only local information is utilized for fault detection and location in the proposed scheme. Moreover, the scheme is verified to have the advantages of fast action speed, high reliability and the ability to resist the transition resistance. A four terminal DC power grid model based on actual engineering parameters is established in PSCAD/EMTDC, and the validity of the protection scheme under different fault conditions is verified by simulation results.

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Section: Fault Location Discriminationmentioning

confidence: 99%

Pole-to-Ground Fault Analysis and Fast Protection Scheme for HVDC Based on Overhead Transmission Lines

Xue

Lian

et al. 2017

Energies

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“…The standby operation of the DC/DC converter is a specific application of the proposed AC voltage control during a local DC fault. The proposed scheme is relatively independent on the fault detection time, which is assumed at 1 ms in this paper [18]. After a local DC fault occurs at t0 = 0.7 s, MMC1 is blocked and MMC2 is switched to AC voltage control mode at t0 = 0.701 s. As the DC voltage of MMC1 drops to zero due to the pole-to-pole DC fault, the AC voltage reference of MMC2 is set to zero to avoid the fault currents The proposed scheme is relatively independent on the fault detection time, which is assumed at 1 ms in this paper [18].…”

Section: Standby Operation Of the Dc/dc Converter During A Local Faultmentioning

confidence: 99%

AC Voltage Control of DC/DC Converters Based on Modular Multilevel Converters in Multi-Terminal High-Voltage Direct Current Transmission Systems

Rui

Fletcher

2016

Energies

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Abstract:The AC voltage control of a DC/DC converter based on the modular multilevel converter (MMC) is considered under normal operation and during a local DC fault. By actively setting the AC voltage according to the two DC voltages of the DC/DC converter, the modulation index can be near unity, and the DC voltage is effectively utilized to output higher AC voltage. This significantly decreases submodule (SM) capacitance and conduction losses of the DC/DC converter, yielding reduced capital cost, volume, and higher efficiency. Additionally, the AC voltage is limited in the controllable range of both the MMCs in the DC/DC converter; thus, over-modulation and uncontrolled currents are actively avoided. The AC voltage control of the DC/DC converter during local DC faults, i.e., standby operation, is also proposed, where only the MMC connected on the faulty cable is blocked, while the other MMC remains operational with zero AC voltage output. Thus, the capacitor voltages can be regulated at the rated value and the decrease of the SM capacitor voltages after the blocking of the DC/DC converter is avoided. Moreover, the fault can still be isolated as quickly as the conventional approach, where both MMCs are blocked and the DC/DC converter is not exposed to the risk of overcurrent. The proposed AC voltage control strategy is assessed in a three-terminal high-voltage direct current (HVDC) system incorporating a DC/DC converter, and the simulation results confirm its feasibility.

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“…The fact that voltage is different, depending on the faulted line, can assist towards the implementation of a discriminative protection system. This is achieved by utilising under-voltage and voltage derivative criteria [2][3][4] or ratio of transient voltages [5].…”

Section: Introductionmentioning

confidence: 99%

Centralised busbar differential and wavelet‐based line protection system for multi‐terminal direct current grids, with practical IEC‐61869‐compliant measurements

Tzelepis¹,

Blair²,

Rousis³

et al. 2018

IET Generation, Transmission & Distribution

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DC Fault Detection and Location in Meshed Multiterminal HVDC Systems Based on DC Reactor Voltage Change Rate

Cited by 307 publications

References 36 publications

Pole-to-Ground Fault Analysis and Fast Protection Scheme for HVDC Based on Overhead Transmission Lines

Pole-to-Ground Fault Analysis and Fast Protection Scheme for HVDC Based on Overhead Transmission Lines

AC Voltage Control of DC/DC Converters Based on Modular Multilevel Converters in Multi-Terminal High-Voltage Direct Current Transmission Systems

Centralised busbar differential and wavelet‐based line protection system for multi‐terminal direct current grids, with practical IEC‐61869‐compliant measurements

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