Technical Guidelines and Prestandardization Work for First HVDC Grids

Akhmatov, Vladislav; Callavik, Magnus; Franck, Christian M.; Rye, S. E.; Ahndorf, T.; Bucher, Matthias K.; Müller, Hans‐Martin; Schettler, F.; Wiget, Roger

doi:10.1109/tpwrd.2013.2273978

Cited by 162 publications

(84 citation statements)

References 7 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%

“…5, the fault current takes about 126 ms to exceed the limit of breaker B41. This gives sufficient time to apply a communication based protection with no additional cost as communication between convertor stations is expected to be an integral part of future HVDC grids [25]. The two line fault detection schemes operating in parallel satisfy both reliability and speed requirements for a range of fault resistances.…”

Section: Communication Based High Resistance Fault Detectormentioning

confidence: 99%

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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%

Section: Communication Based High Resistance Fault Detectormentioning

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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“…The no-controllable DC signal is then regulated through the DC-DC converter and PWM control to provide controllable parameters to the DC collector into the wind park. The standard for operating an HVDC grid is as described in [9]. The VSC-DC internal link of the wind park has the ability to capture the maximum power from the wind resources.…”

Section: System Descriptionsmentioning

confidence: 99%

Dynamic analysis of DC-DC converter internal to an offshore wind farm

Musasa¹,

Gitau²,

Bansal³

2014

3rd Renewable Power Generation Conference (RPG 2014)

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This paper investigates the dynamic performance of an active rectifier integrated into a wind park. The small changes in the DC current and the DC voltage are examined. The small variations are caused by the miniature power flow unbalance between the offshore wind park and the grid land. Internal DC collector is considered into the wind park, which provides an internal DC medium voltage bus. The AC output signal from the wind generator to the internal DC collector or DC bus is regulated through active rectifier. An active rectifier is a cascade connection of an uncontrolled full bridge diode rectifier and a controlled DC-DC boost converter. The small changes in the DC current and DC voltage due to power flow unbalance are analysed across the boost converter. The way in which these small variations affect the internal medium DC voltage is determined. The results are presented in the form of small signal transfer functions and are evaluated with MATLAB software.

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“…Though a HVDC grid has many advantages, there are challenges that HVDC grid researchers need to face and deal with, such as how to control power flow and direct voltage and how to achieve fast control and protections. Currently, the researchers around world are undertaking HVDC grids related R&D work with their own models which are of different configurations and data [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

HVDC grid test models for different application scenarios and load flow studies

Han

et al. 2016

J. Mod. Power Syst. Clean Energy

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High Voltage Direct Current (HVDC) grids are the most effective solutions for collection, integration and transmission of large scale remote renewable resources to load centers. A HVDC grid test model can provide a common reference and study platform for researchers to compare the performance and characteristics of a DC grid with different DC control functions and protection strategies. It can also provide reference cases for testing of simulators and digital programs. This paper proposes a comprehensive HVDC grid test model and the associated four sub test models for system studies to meet the research purposes and requirements for different DC grid application scenarios. The design concept, topologies, configurations and functions of the test models are described in detail and their basic system data for load flow studies are provided. Finally load flow simulation studies with PSS/E (Power System Simulator/Engineering) program for each of the models are undertaken and the corresponding results are presented and analyzed in the paper.

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Technical Guidelines and Prestandardization Work for First HVDC Grids

Cited by 162 publications

References 7 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

Dynamic analysis of DC-DC converter internal to an offshore wind farm

HVDC grid test models for different application scenarios and load flow studies

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