A new protection principle for HVDC transmission lines based on fault component of voltage and current

This study presents a novel protection criterion of fault locating in multi-terminal DC (MTDC) transmission systems. When a fault occurs on the DC transmission line of the MTDC system, the traditional protection cannot locate the fault because there is no smoothing reactor (equipped at the converter output) in the transmission lines. In the circumstance of AC/DC conductor contact (ADCC) fault, the varieties of the transient voltage and current components are given based on the symmetrical fault analysis. According to the Bergeron equation, the travelling wave characteristic is analysed. A new criterion of fault locating using the change rate of the current travelling wave is presented which can reduce the impacts of the related fault on the AC system. Finally, simulation results verify the effectiveness of the proposed protection criterion.

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“…In (19), H2 ≠ 0 for the small reflection travelling wave u r . However, H2 < H1 based on (18) and (19).…”

Section: The Influences By the Rectifiermentioning

confidence: 86%

“…It depends on the accuracy of the transmission line parameters. Recently, the method based on the DC fault current direction [17] or on the fault current and voltage components [18] can locate the fault effectively. However, the protection can only be realised with two-terminal electric quantities.…”

Section: Introductionmentioning

confidence: 99%

Paralleled multi‐terminal DC transmission line fault locating method based on travelling wave

Cheng

Guan²,

Tang³

et al. 2014

IET Generation, Transmission & Distribution

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“…By this reason, in [5], according to the comparison of the energy of the forward and backward voltage traveling wave, the fault position can be recognized. Moreover, a pilot directional protection scheme for HVDC transmission line is proposed, which extracts the direction feature of specific frequency current through spectrum analysis and integral [6,7]. However, these methods don't have strong robustness to noise because the integral cannot get rid of noise disturbance and the fault current energy would be low and the integral would be much smaller when a high-resistance fault occurs.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, a novel algorithm for transmission line protection is proposed following the principle of relative entropy of wavelet energy, having improved the reliability of protection method proposed in [7] under high resistance grounding fault conditions and its anti-noise property. Furthermore, the proposal is based on the analysis of the HVDC transmission system and its superimposed circuit which indicate the directional features of the voltage and current.…”

Section: Introductionmentioning

confidence: 99%

A Pilot Directional Protection for HVDC Transmission Line Based on Relative Entropy of Wavelet Energy

Lin¹,

Gao²,

He³

et al. 2015

Entropy

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Abstract:On the basis of analyzing high-voltage direct current (HVDC) transmission system and its fault superimposed circuit, the direction of the fault components of the voltage and the current measured at one end of transmission line is certified to be different for internal faults and external faults. As an estimate of the differences between two signals, relative entropy is an effective parameter for recognizing transient signals in HVDC transmission lines. In this paper, the relative entropy of wavelet energy is applied to distinguish internal fault from external fault. For internal faults, the directions of fault components of voltage and current are opposite at the two ends of the transmission line, indicating a huge difference of wavelet energy relative entropy; for external faults, the directions are identical, indicating a small difference. The simulation results based on PSCAD/EMTDC show that the proposed pilot protection system acts accurately for faults under different conditions, and its performance is not affected by fault type, fault location, fault resistance and noise.

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“…Failure statistics on Tianshengqiao-Guangzhou HVDC project (China, 1800 MW, 6500 kV) showed that transmission line faults were 50% of the total system faults from 2001 to 2007 (Li et al, 2009). To control and protect HVDC transmission lines, direct current measurement equipment must be installed in converter stations to provide reliable and accurate measured values (Xing et al, 2011;Yu et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

A prototype optical fibre direct current sensor for HVDC system

Yan

Xing

2015

Transactions of the Institute of Measurement and Control

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Direct current of the transmission line is the key parameter for the control and protection of high-voltage direct current (HVDC) transmission systems. In this paper, a novel optically powered direct current sensor for HVDC measurement is presented. The direct current is first detected via a precise direct shunt, and then converted to an optical pulse signal by an analogue voltage processing unit, which is designed using low power consumption technology. Subsequently, the optical pulse signal is transmitted to the control room via an optical fibre system and recovered by a ground-located optical pulse processing unit. Moreover, part count method and part stress analysis method are used to predict the failure rate of the power supply and conversion circuit. Tests in the China National High Voltage Metering Station and the laboratory show that the proposed sensor achieved an accuracy within to 60.5% from 300 to 3000 A, and the power consumption of analogue voltage processing unit is less than 46 mW on the condition of maximum 8k sampling frequency.

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A new protection principle for HVDC transmission lines based on fault component of voltage and current

Cited by 17 publications

References 5 publications

Paralleled multi‐terminal DC transmission line fault locating method based on travelling wave

Paralleled multi‐terminal DC transmission line fault locating method based on travelling wave

A Pilot Directional Protection for HVDC Transmission Line Based on Relative Entropy of Wavelet Energy

A prototype optical fibre direct current sensor for HVDC system

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