VSC-HVDC system protection: A review of current methods

Candelaria, Jared; Park, Jae-Do

doi:10.1109/psce.2011.5772604

Cited by 161 publications

(94 citation statements)

References 17 publications

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“…In the analysis, single pole to ground faults (negative pole to ground, for illustration purpose negative pole voltage is measured by keeping the reference probe on the ground and tip on the negative pole so that a fault shows a drop in voltage) were considered, because independent protection design for each pole is expected to be common in DC grid protection [25] and the pole to ground faults are considered as significantly more frequent [26]. The impact of the signal processing circuit used for capturing peak dv/dt was also taken in to account.…”

Section: Challenges For Rocov Based DC Grid Protectionmentioning

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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Section: Challenges For Rocov Based DC Grid Protectionmentioning

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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“…(c) Capacitor DC circuit breakers (CDCCB), introduced in [32] and also mentioned in [34], are what the name implies. They are very fast devices with a 10 µs operation time.…”

Section: Protection Devicesmentioning

confidence: 99%

Transient analysis of DC distribution grids

Petropoulos

Mackay

Ramírez-Elizondo

et al. 2017

2017 IEEE Second International Conference on DC Microgrids (ICDCM)

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The latest developments in power electronics along with the increased generation from Renewable Energy Sources (RES), the new prosumers who both generate and consume electricity and the rapid adoption of DC loads in the household are forcing us to rethink the manner with which power is distributed and consumed. The proposal to make DC technology an integral part of the distribution network seems to have more merit. This change would lead to energy savings in power conversion and enable the creation of meshed DC grids, highly controllable and flexible networks which will be able to facilitate the more sustainable energy future towards which we strive. To build such a system, however, a different approach than the one used in AC systems is needed, due to the peculiarities of DC technology. In our research for the best possible way to protect these systems, it is imperative to constantly test the protection circuit not only as a standalone, but also incorporate it in the systems that will be built and test them together. In other words, transient analysis of the systems with the proposed protection included is an integral part in gauging the impact of the latter on the former during operation, and therefore in assessing and improving the protection for this specific application.This thesis presents such a transient analysis of various configurations of DC distribution systems. A combination of theoretical and practical methods were used to investigate the behavior of the systems' variables after the occurrence of faults and current interruption. A number of networks of varying complexity were built with detailed cable models using the EMTP/ATP software package in order to simulate a multitude of faults and assess each network's response at various positions and most crucially, the effectiveness of the protection scheme in reducing the impact of the transients after the fault. The travel speed of the transients was also investigated. At the same time, a set of measurements was conducted on a DC street lighting network to study the transient behavior of a real system. A separate model was built to resemble the measured system, in order to compare between the simulations and the measurements. The evaluation of the measurement and simulation results led to conclusions that will contribute to the creation of better, safer and more versatile DC distribution grids. The comparison showed that the models used can approach the behavior of the real system to a reasonable degree. The other simulations indicated that the transient impact is significantly smaller in locations far from the fault, but continued operation of the healthy pole cannot be guaranteed, especially after earth faults. Dimitrios Petropoulos Delft, September 2016iii ACKNOWLEDGEMENTS

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“…따라서 전압형 HVDC 시스템을 이용한 전력망의 구성 시 전력 네트워크의 안정성 향상을 위하여 사고보호에 대한 신뢰성을 향상시키는 것이 요구된다. 그 중 가장 중요한 부분으로서 각 컨버터 스테이 션마다 DC 차단기의 설치가 요구된다 [8][9][10].…”

Section: 서 론unclassified

An Improved Topology of DC Circuit Breaker Based on Inverse Current Injection Method

Cho¹,

Son²,

Kim³

et al. 2014

The Transactions of The Korean Institute of Electrical Engineer

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-VSC-HVDC system is vulnerable to a DC fault because the fault current can be injected from AC system to DC system during the fault. Therefore, DC circuit breaker is required to isolate faults in VSC-HVDC system. The inverse current injection method of circuit breaker has been considered as DC circuit breaker. However, the topology has drawback that the breaking time is longer than hybrid circuit breaker using semiconductor devices. In order to solve this problem, this paper proposes an improved topology of circuit breaker based on inverse current injection method . In addition, the proposed topology will be compared with the existing topology. And we will verify its effects by using the simulation results.

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VSC-HVDC system protection: A review of current methods

Cited by 161 publications

References 17 publications

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

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

Transient analysis of DC distribution grids

An Improved Topology of DC Circuit Breaker Based on Inverse Current Injection Method

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