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A high-voltage direct current (HVDC) system uses direct current (DC) and high voltages (currently between 100 kV and 800 kV) for electric power transmission. It contrasts with the more common alternating current (AC) transmission systems.
History, Applications & Measurement
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| mercury-arc valves and | instance of | These advantages led to early low-voltage DC transmission systems being supplanted by AC systems around the turn of the 20th century.Practical conversion of current between AC a… | 0.80 | text |
| starting in the 1970s | instance of | These advantages led to early low-voltage DC transmission systems being supplanted by AC systems around the turn of the 20th century.Practical conversion of current between AC a… | 0.80 | text |
| power semiconductor devices including thyristors | instance of | These advantages led to early low-voltage DC transmission systems being supplanted by AC systems around the turn of the 20th century.Practical conversion of current between AC a… | 0.80 | text |
| integrated gate-commutated thyristors | instance of | These advantages led to early low-voltage DC transmission systems being supplanted by AC systems around the turn of the 20th century.Practical conversion of current between AC a… | 0.80 | text |
| wind into the main transmission grid | instance of | without increasing prospective short-circuit current.Integration of renewable resources | 0.80 | text |
| grading capacitors | instance of | Additional passive components | 0.80 | text |
| resistors need to be connected in parallel with each thyristor in order to ensure that the voltage across the valve is evenly shared between the thyristors | instance of | Additional passive components | 0.80 | text |
| the insulated-gate bipolar transistor | instance of | This is an important limitation in some circumstances.With some other types of semiconductor devices | 0.80 | text |
| 3rd or 5th harmonics.The task of designing AC harmonic filters for HVDC converter stations is complex | instance of | noncharacteristic harmonics | 0.80 | text |
| computationally intensive | instance of | noncharacteristic harmonics | 0.80 | text |
| since in addition to ensuring that the converter does not produce an unacceptable level of voltage distortion on the AC system | instance of | noncharacteristic harmonics | 0.80 | text |
| it must be ensured that the harmonic filters do not resonate with some component elsewhere in the AC system | instance of | noncharacteristic harmonics | 0.80 | text |
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