Decreasing the commutation failure frequency in HVDC transmission systems

Arne Hansen (retired June, 2000); Henrik Havemann (retired June, 2000)

doi:10.1109/61.871369

Decreasing the commutation failure frequency in HVDC transmission systems

Arne Hansen (retired June, 2000), Henrik Havemann (retired June, 2000)

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Abstract

In this paper we show how a fairly large proportion of those commutation failures that are due to single-phased short circuits to earth can be avoided. In a control circuit based on a digital signal processor (DSP) it is possible, with instantaneous results, to switch from a normal control strategy with equidistant firing pulses to a strategy that takes into consideration the potentially dangerous voltage changes on the supply lines, If the supply voltages are monitored continuously, it is possible to calculate the necessity of advancing the firing pulses to avoid commutation failures. In the paper such a calculation technique is described. The monitoring times may be approximately 50 μsec apart corresponding to a distance of 0.016 radians or about 1.

Original language	English
Journal	IEEE Transactions on Power Delivery
Volume	15
Issue number	3
Pages (from-to)	1022-1026
ISSN	0885-8977
DOIs	https://doi.org/10.1109/61.871369
Publication status	Published - 2000

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Copyright: 2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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AU - Havemann (retired June, 2000), Henrik

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PY - 2000

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N2 - In this paper we show how a fairly large proportion of those commutation failures that are due to single-phased short circuits to earth can be avoided. In a control circuit based on a digital signal processor (DSP) it is possible, with instantaneous results, to switch from a normal control strategy with equidistant firing pulses to a strategy that takes into consideration the potentially dangerous voltage changes on the supply lines, If the supply voltages are monitored continuously, it is possible to calculate the necessity of advancing the firing pulses to avoid commutation failures. In the paper such a calculation technique is described. The monitoring times may be approximately 50 μsec apart corresponding to a distance of 0.016 radians or about 1.

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Decreasing the commutation failure frequency in HVDC transmission systems

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