VSC-HVDC Bipolar Grid Based On Novel Distance Protection Scheme

Mostly distance protection is widely used in HVAC system no practical implementation is done for HVDC system. It is essential to measure accurately difference in internal fault from external correctly in distance protection at the zone boundary. The smoothing reactor in HVDC system is present at two ends and it can be considered as the operating boundary of distance protection. Considering these feature this paper introduce distance protection method for HVDC transmission line. Current and voltage at end-point are planned accurately using those at the relay point, based on distributed parameter model. The line between the fault point and end point is simplified as RL model lumped parameter and differential equations obtain fault distance. In this way, accuracy of calculation at the zone boundary is attained, that contributes to the improvement in operation of protection. Simulation results show that proposed method is used as primary protection for HVDC transmission and is capable of protecting the whole line with high rapidity.

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A Fast Full-Line Tripping Distance Protection Method for HVDC Transmission Line

2012 Asia-Pacific Power and Energy Engineering Conference ◽

10.1109/appeec.2012.6307375 ◽

2012 ◽

Cited By ~ 5

Author(s):

Jiankang Zhang ◽

Jiale Suonan ◽

Zaibin Jiao ◽

Guobing Song ◽

Xiaohua Su

Keyword(s):

Transmission Line ◽

Full Line ◽

Distance Protection ◽

Hvdc Transmission ◽

Protection Method

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A Novel Two-step Distance Protection for Flexible HVDC Transmission Lines

E3S Web of Conferences ◽

10.1051/e3sconf/202125602017 ◽

2021 ◽

Vol 256 ◽

pp. 02017

Author(s):

Zeya Fang ◽

Minghao Wen ◽

Junchao Zheng ◽

Minghao Wen

Keyword(s):

Transmission Lines ◽

Low Frequency ◽

Lumped Parameter Model ◽

Distance Protection ◽

Backup Protection ◽

Hvdc Transmission ◽

Protection Method ◽

Dc Line ◽

Hvdc Line ◽

Step Distance

DC line fault is one of the key problems that must be solved in a flexible HVDC system. During quite a long time between the existing main protection and backup protection of the HVDC line, there is no line protection method to detect the fault, which may lead the protection at the AC side to act before the backup protection of the DC line. To solve the problem, a novel two-step distance protection for flexible HVDC lines is proposed in this manuscript. Firstly, based on the uniform distributed parameter model, the equivalent lumped parameter model of the HVDC transmission line at low frequency is analyzed. Secondly, according to the time domain differential equation and the least squares algorithm, novel distance protection based on the iterative calculation of fault distance is proposed, which can eliminate the influence of distributed capacitive current and improve the precision of calculation. To improve the rapidity and reliability of the distance protection, low pass filters with two different cut-off frequencies are used to process the electrical quantities. Finally, simulation results show that the proposed distance protection can respond to metallic poleto-ground faults and pole-to-pole faults rapidly and reliably.

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A Novel Protection of Transmission Lines for Two ±500kV HVDC Systems Erected on the same Tower

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.383-390.3669 ◽

2011 ◽

Vol 383-390 ◽

pp. 3669-3674

Author(s):

Min Huang ◽

Gang Wang ◽

Hui Hui Luo ◽

Yuan Sheng Liang

Keyword(s):

Transmission Lines ◽

Mutual Influence ◽

Long Distance ◽

Decoupling Method ◽

Protection Strategy ◽

Hvdc System ◽

Hvdc Transmission ◽

Protection Scheme ◽

Novel Method ◽

Mutual Induction

Up to now, there is no precedent of applying two bipole lines (TBL) on the same tower technology of long-distance HVDC transmission project in the world. Owing to mutual influence between the two HVDC circuits on the same tower, the traditional protection of transmission line is faced with technical difficulties on fault pole identification, especially high grounded fault loop impedance. A new protection scheme of transmission lines for the double ±500kV HVDC circuits on the same tower is proposed. Based on electromagnetic decoupling method for TBL on same tower is proposed by analyzed the characteristic of coupling mutual induction, a four module components is proposed to decouple the network equation and analyze the fault modal network. On this basis, a novel method of fault pole identification based on the polarity comparison of line-mode back traveling wave is proposed. It has been made that validates the advantage of this novel protection strategy to identify the fault pole by simulation of PSCAD/EMTDC on the model of the TBL ±500kV HVDC system on the same tower in Xiluodu-Guangdong China.

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