Journal article
Decreasing the commutation failure frequency in HVDC transmission systems
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.
| Language: | English |
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| Publisher: | IEEE |
| Year: | 2000 |
| Pages: | 1022-1026 |
| ISSN: | 19374208 and 08858977 |
| Types: | Journal article |
| DOI: | 10.1109/61.871369 |
Condition monitoring DSP Digital signal processing Digital signal processors Earth Frequency HVDC power transmission HVDC transmission HVDC transmission systems Pulse circuits Switches Switching circuits Voltage control commutation commutation failure frequency decrease commutation failures avoidance control circuit digital control digital signal processing chips digital signal processor equidistant firing pulses monitoring normal control strategy potentially dangerous voltage changes power system faults power transmission control short-circuit currents single-phased short circuits supply lines voltage changes supply voltages monitoring switching voltage measurement
