Development of a Novel Protection Device for Bipolar HVDC Transmission Lines

Kong, Fei; Hao, Zhiguo; Zhang, Song; Zhang, Baohui

doi:10.1109/tpwrd.2014.2305660

Cited by 126 publications

(82 citation statements)

References 16 publications

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“…While the pole-to-pole fault occurs, the short circuit current at the protection installation of the line will rise rapidly. The current gradient is utilized to detect the abnormality since the system abnormality can be characterized by a current change [27], which can be expressed as: where, I(k-i) is the i-th sampling current value prior to the present moment; ∇I(k) is the calculated current gradient. The start criterion of the protection is defined as:…”

Section: Protection Starting Criterionmentioning

confidence: 99%

A Novel Protection and Location Scheme for Pole-to-Pole Fault in MMC-MVDC Distribution Grid

et al. 2018

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Nowadays, the efficient and reliable protection and location schemes for MMC-MVDC (Modular Multilevel Converter-Medium Voltage Direct Current) grid are few. This paper is the first to propose a scheme to not only protect the feeders and the busbar, but locate the segments in MMC-MVDC grid. To improve the reliability, this paper analyzes the transient characteristics of the pole-to-pole fault and then obtains the characteristic frequency band. Based on S-transform, STCFB (S-transform characteristic frequency band) Phase of fault component is utilized to construct the identification criterion for faulty feeder and faulty segment. The whole scheme can be divided into three steps, namely, protection starting criterion, faulty feeder and busbar protection criterion, and faulty segment location criterion. Firstly, the current gradient method is utilized to quickly detect the fault and start the protection device. Secondly, the non-unit protection criterion on busbar and feeders is proposed according to STCFB Phase of the voltage and current fault component. Thirdly, according to the STCFB Phase on both sides of the feeder segment, the faulty segment can be located. A radial MMC-MVDC distribution network model was built in PSCAD/EMTDC software to evaluate the performance of the protection and location method. Simulation results for different cases demonstrate that the proposed scheme has high accuracy, good adaptability and reliability.

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Section: Protection Starting Criterionmentioning

confidence: 99%

A Novel Protection and Location Scheme for Pole-to-Pole Fault in MMC-MVDC Distribution Grid

et al. 2018

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“…At present, the start-up methods usually utilize DC voltage or current amplitude and change rate as starting criteria. An improved voltage gradient method is used for protection start-up since a system abnormality can be characterized by a DC voltage change [29]. The criteria and calculation expression of the protection start-up unit are:…”

Section: Protection Start-up Unitmentioning

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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“…Directional relays such as [16] are widely used to improve fault discrimination in AC grids. The most common method of detecting the direction of a fault is comparison of the magnitudes of forward and backward waves which are calculated using both voltage and current measurements [17,18]. Current derivatives have been used to discriminate forward and backward faults in [19].…”

Section: Introductionmentioning

confidence: 99%

Application of new directional logic to improve DC side fault discrimination for high resistance faults in HVDC grids

Haleem

Rajapakse

2017

J. Mod. Power Syst. Clean Energy

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This paper proposes a simple and fast way to determine the direction of a fault in a multi-terminal high voltage direct current (HVDC) grid by comparing the rate of change of voltage (ROCOV) values at either side of the di/dt limiting inductors at the line terminals. A local measurement based secure and fast protection method is implemented by supervising a basic ROCOV relay with a directional element. This directional information is also used to develop a slower communication based DC line protection scheme for detecting high resistance faults. The proposed protection scheme is applied to a multi-level modular converter based three-terminal HVDC grid and its security and sensitivity are evaluated through electromagnetic transient simulations. A methodology to set the protection thresholds considering the constraints imposed by the breaker technology and communication delays is also presented. With properly designed di/dt limiting inductors, the ability of clearing any DC transmission system fault before fault currents exceeds a given breaker capacity is demonstrated.

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Development of a Novel Protection Device for Bipolar HVDC Transmission Lines

Cited by 126 publications

References 16 publications

A Novel Protection and Location Scheme for Pole-to-Pole Fault in MMC-MVDC Distribution Grid

A Novel Protection and Location Scheme for Pole-to-Pole Fault in MMC-MVDC Distribution Grid

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

Application of new directional logic to improve DC side fault discrimination for high resistance faults in HVDC grids

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